Catalyst - Science topic

need explanation about catalyst, time, solvent , workup procedure (acid or base workup),and purification methodology

How to find out acid strenght of lewis catalyst such as metal oxide nanocatalst

I have ionic liquid and H2, CO2 gas, catalysts. I want to do the hydrogenation reaction in a high pressure reactor but I dont know how to feed the reactants then start the experiments.

Thank you so much!

What would be the most suitable alternative catalyst to replace [Msim]HSO₄?

Like dabco8154

If anyone know which perameter is important for this discuss with me.

Thank you

I am considering submitting a manuscript to MDPI Catalysts as part of my PhD thesis work. I am aware that MDPI as a publisher has received some criticism regarding its open-access model, but I also noticed that Catalysts is ranked Q1 in Environmental Science and Q2 in Chemistry.

Since my university requires a Q2 journal for thesis inclusion, Catalysts seems like a good option, especially as my study is more fundamental in nature. However, I want to ensure that publishing here will not negatively impact my academic profile in the long run.

My main questions are:

1. Does Catalysts have a better reputation than other MDPI journals? Some MDPI journals are widely accepted, while others are more questionable—where does Catalysts stand?

2. Is it acceptable for an early-career researcher to publish in this journal before targeting higher-impact journals later in my career?

3. Have you had any experiences with publishing in Catalysts? How was the review process in terms of rigor and quality?

I appreciate any insights, especially from those familiar with Catalysts or the MDPI publishing model.

The oil contains mostly thiophenes and benzothiophenes

...

How Negative charged catalyst react to ciprofloxacin solution pH which is higher than pzc and result in higher degradation efficiency

I might have thought that the 'optimal' reaction rate in a sequence of biological reactions (e.g. in biosynthesis) might not just be the fastest.

i will do synthesis of coumarin using 10 mmol of salicylaldehyde and 10 mmol diethyl malonate using 10 mol% of catalyst L-proline. could anyone help me to count how much catalyst (in mg) should i use?

Hello, i was trying to perform cyclic voltammetry experiment for one of my copper complex for Hydrogen evolution. I have recorded the CV of my catalyst first at different different scan rate. Then i fixed one of the scan rate and after that added Acetic acid in the mixture and perform the electrochemistry where the current rises during reductive scan. Now i am unable to understand how i will use this Cyclic Voltammogram to calculate the K(obs) i.e. TOF and Overpotential also.

Can you please provide me solution for this or any useful contents/articles where i could resolve this issue.

I would like to calculate COD for degraded organic compound.

I got NH3-TPD curve that is not common with other catalyst (other will ascend at certain temperature and descend back to its baseline, whilst mine ascended and not going descend). If I do a baseline to make the curve similar with others, it would change the area under the curve and affect the acid calculation. Should I let my curve as it is? Or can I have a better option with my curve?

I am working on a bifunctional catalyst for the zinc-air battery system. The catalyst is a ferrite and carbon composite. While measuring ORR activity, sometimes I see a peak in the LSV plot. For the same sample from the same dispersion, I did two LSVs. One measurement has a peak; in the other, it is not. What is the probable reason for this kind of behavior? Figure attached. Thanks

Hello there

I was wondering about the correct procedure for disposing of a Pd complex catalyst (as PdCl2(dppf) or other) after it is used for a reaction in the lab. I do not feel confident about what I should do.

Thanks for helping!

Adam A Needle

Hello all, I am looking for five collaborators to work on a manuscript titled "Heterogeneous Catalysts in Biodiesel Synthesis: A Comprehensive Review" for publication in Scientific Research Publishing. If interested, please share your email for further communication. Thank you.

Dr. Masime,

Nairobi, Kenya.

In wet impregnation, the catalyst support and the precursor solution have an excess amount of water. I have read about three methods in the literature: 1. Dry at 80°C while stirring until completely dried, then place in a drying oven. 2. Dry at 80°C while stirring until a slurry state is reached, then place in a drying oven. 3. After impregnation and stirring, use a rotary evaporator until the solvent is removed and it is dry. Scrape off the substance adhering to the inside of the flask, then place it in a drying oven. I used the third method, and I am not sure if this approach results in uniform distribution of the metal. Additionally, I am concerned that the third method may cause the precursor salts to adhere to the inner walls without being loaded onto the carrier, and thus might be scraped off together with it. Although I personally believe that the first two methods also result in uneven distribution and also have metal salts that are not loaded onto the carrier.Thanks.

Hi. Can anyone help understand, how mechanisme substitution fe3+ to ca2+ of catalalyst cao-fe2o3 as a bifungtional catalyst? and picture atomic

Is 20nm gamma Alumina suitable as catalyst support? Is it too big or too small?Please tell me. Thank you very much for your help.

Without changing catalyst (ZN)

I want to convert the S-species to H2S using a zeolite catalyst? Which will be the best choice: Zeolite-beta, hydrogen or Zeolite-Y, Hydrogen?

I found my catalysts are showing increased surface area after reaction, but my catalyst is showed stable activity for longer period. What is the reason for increasing surface area after the reaction

thanks

I synthesized iron tungstate nanoparticles and measured their photocatalytic activity by taking a 10 ppm methylene blue solution and adding 10 mg of catalyst. But after adding and stirring a little, the entire color of methylene blue goes away, after centrifuging and separating the catalyst, I see that the color of the solution has become very light greenish type. I don't understand what actually happened and what should I do. Can anyone help me plz?

I made a cu-mof catalyst using cuso4+h2o mixed with 2-metylimidazole+methanol. But when tested for BET the graph results are like this. If the results are like this, can my catalyst be used for cracking WCO?

How should i interpret the BET datas if the surface area and pore volume increases when the metal is doped on support material while pore size decreases (from mesoporous to microporous)? In addition, after the use of catalyst, all of surface area, pore volume and pore size decrease. Do you have any article recommendations about interpreting the BET results about metal-doped catalysts for gaining wider knowledge? It is harder as a chemical engineering student to interpret the characterization datas since no lectures are given about it. I'll appreciate your answers!! Kind regards.

The catalyst is degrading one cationic dye while adsorbing the other (no degradation ).

FYI

Catalyst is MFI zeolite

Si/Al = 140,25.40.11.5,15

I am using this catalyst to study methanol to DME conversion

Metal-containing heterogeneous catalysts often need to be calcined before reduction, so what are some examples of catalysts that perform better without calcination? What is the reason and how many categories can the principle be divided into?

I am preparing ammonia cracking catalyst. I dont have a thermal reactor to study ammonia decomposition and the efficiency of my catalyst. Can you suggest me any alternative study to understand how my catalyst would act in a decomposition process. That I can check in my lab

Hi Everyone,

I plan to deposit a catalyst (TS-1@Co-PDA, in the core: TS-1 zeolite with a shell of Polydopamine designed with Cobalt) on a rotating ring-disk electrode (RRDE) to evaluate the oxidation-reduction reaction (ORR) performance of my catalyst. My reference used Nafion solution 5% as a binder. Can I use another binder like silicon oil or PVDF?

Hedieh

…

I am performing catalytic metal supported benzyl alcohol reaction kinetics in presence of potassium carbonate base. Every time order change observed at lower catalyst conc. It showing zero order at 50 deg. cent. At 70 and it becomes second . But when I am using higher catalyst conc. It becomes first order at 90 degree cent. . Why is happened?

Dear Researchers,

I hope this email finds you well.

I am currently working on research involving DFT calculations to study the mechanism of CO2 reduction using a catalyst with water as the reactant. I am utilizing Gaussian software for this purpose. However, I am encountering difficulties in setting up and running the reaction mechanism within Gaussian.

I am reaching out to see if anyone with experience in this area could provide some guidance or advice on how to proceed. Any help or suggestions would be greatly appreciated.

Thank you very much for your assistance.

A methanol production process combines tri-reforming of methane (TRM) with water electrolysis to utilize CO₂. The TRM reactor uses a Ni/Al₂O₃ catalyst, and the methanol synthesis reactor uses a Cu/ZnO/Al₂O₃ catalyst. The goal is to achieve a methanol production rate of 2095 tons per day, with a gas hourly space velocity (GHSV) of 3000 h⁻¹ in the TRM reactor. Calculating the required catalyst quantities involves considering the reaction conditions and catalyst efficiencies.

Do gases emerge from catalytic oxidation in the presence of zeolite as a catalyst, and what are the gases, if any?

FeCrAlloy® foils are commonly used for fabricating metallic monoliths. However, their lack of specific surface area/roughness (pores) hinders catalyst adhesion during the coating process. Several pre-treatment processes have been investigated in recent years. Is it possible to exploit the high porosity of MOFs as a primer, thereby enhancing catalyst adhesion on these monoliths for the development of more stable structured catalysts?

Dear colleagues,

I'm performing some catalytic studies on a catalyst able to cleave vicinale diols and other moieties in various substrates. I'm performing some studies on the catalyst loading aspect of the reaction and my data suggest something unusual to me. Going down with the catalyst loading from 10% to 2% reactions rates go down, as expected. At 1% the reaction seems faster than with 2 and 3.3% catalyst loading. The percentages are molar percentage to the substrate. This looks quite strange to me, and I can't really rationalize it. Did someone ever encountered something similar?

Is it possible to brake H2O into H2 and O2 using hetrogeneous catalyst without using electricity.

i am looking for responces with referance.

1. I synthesized alkyl gallates (ethyl gallate, butyl gallate, and amyl gallate) using Fischer esterification.

2. I used TsOH instead of concentrated H2SO4 as the catalyst.

3. After refluxing for about 7 hours (with no gallic acid spot observed in TLC), I evaporated the excess alcohol and solvent (toluene).

4. After that, the crude product was diluted in ethyl acetate and washed with water.

5. The aqueous phase was extracted 3x with ethyl acetate.

6. The organic phases were combined and washed with a 5% NaHCO3 solution.

When I washed the "combined" organic phase with a 5% NaHCO3 solution, the aqueous phase turned dark green. Why did this happen? Is it due to the TsO- salt, or is there another explanation?

I already repeat this reaction/process about 3-4 times and I always end up with that same dark green color.

The biocatalysts can be more available than traditional catalysts? The quation is related to the sustainablity by conversion of carbon using biocatalysts.

This research question draws upon various areas of expertise such as biodiesel production, heterogeneous catalysts, optimization, and life cycle analysis. It presents opportunities for collaborative research with professors from UK universities with expertise in similar fields, allowing you to combine your knowledge and skills to tackle this interdisciplinary challenge

"As researchers, we synthesized a catalyst by mixing proline and taurine, which exhibited significant reactivity in heterocyclic compound synthesis. Characterization via proton and carbon NMR, as well as FTIR, revealed interaction between the components. Despite this, we are unable to ascertain the structure of the catalyst. What could be the possible structure of this catalyst, considering the interactions observed?"

Hello,

I am performing esterification reactions between fatty acids and alcohols, in presence of methanesulfonic acid and H3PO2 as catalysts. At the end of the reaction, to reach the acid index I want, as well to neutralize the catalysts, I use NaOH, 30 % solution. At the end of the reaction, I perform filtration by using some powders. What I observed is that after a while the acid index increases, this being un inconvenient, because it should be in a certain range. I believe that this might be the effect of an reversible reaction, which means that the catalysts are still active.

What can I use at the end of the synthesis for the neutralization of the catalysts to be sure that the reversible reaction won't take place? or may be there are some composite able to adsorb them?

thank you in advance,

Elena

Do the atomic orbitals of the same atom have the same energy under different chemical conditions? In other words, can atomic orbital energy be changed by external changes? For example, does Fe(OH)3 have the same atomic orbital energy as Fe in Fe2O3?

What properties determine the ability of different valence metals to adsorb and activate small molecules (such as CO2, N2)?

Different metals have different adsorption and activation abilities for different small molecules (such as N2, CO2). What are the properties of the met

I have to calculate the carbon content present in the catalyst from the TGA plot. Does anybody have an idea?

Explain anyone after completely removed dye from contaminated water, what about catalyst whether catalyst also removed or not

How do we determine whether modes in Raman spectroscopy are A1g, B1g, or Eg in catalysts and composites we have synthesized?

I am researching about limonene oxidation in a reflux condenser, I use TBHP, DMF, but I do not know a good catalyst for this reaction.. Can you give me some suggestions about them? Like solvent, catalyst, temperature, etc? My favorable product are diols, carvone, carveol.... Thank you

Techniques used for immobilization of Ag-TiO2 catalysts

Hello everyone, please I'm conducting catalyzed methane pyrolysis simulation using a fluidized bed reactor on Aspen plus.

The warning shown reads Total bed mass elutriated.

I have tried changing the cross section constant diameter but it leads to an error of the bed height not being able to be determined.

I would appreciate any help I can get

Hello. I synthesized a support, and I adsorbed metals onto the surface of the support. I found that the surface area of the support/metals is large compared to the support. Has anyone found this result?

..

I have found many papers that describe the use of PPNCl as a (co-)catalyst for ring opening polymerizations, but I do not understand how this species act. Can someone explain or recommend a good paper on this subject?

Hello scientists

I am PhD student in united states workin in acid sites characterization in zeolites. I am using methanol as a probe molecule to investigate the acid sites in zeolites. I am using fix bed catalyst reactor along with k type thermocouple connected to a temperature programmer and outlet of the reactor is connected to the gc system. I am facing the issue of reproducibility in my reaction I am getting 30% increment and decrement in conversion each an every time I try to run the reaction with the same catalyst mass. Please suggest me what could be the possible cause for this problem.

Hello everyone.

Right now I‘m doing research and synthesizing SrTiO3 catalyst and we need to doped it with F. The point is, please anyone can tell me how to calculate wt% of Fe in SrTiO3. I hope someone can give me an answer.

Thank you for your attention.

I'm doing Buchwald Hartwig amination and as a catalyst can I use palladium chloride instead of palladium acetate? What can be the possible issues that can come up for this change?

Please assist me. I greatly appreciate your thoughts, and they may be useful for my upcoming research.Thank you so much

I have a catalyst sample consisting of various metal oxides in powder form. However, I would like to convert it into a thin film before conducting sample characterization and catalyst performance testing. How can I create a thin film from the metal oxide powder without altering its properties and without adding polymer? Thank you very much in advance.

i need to prepare a catalyst (aluminium chloride ) , it is a product of the aluminium reaction with hydrochloric acid . BUT the problem is ; Hydrogen gas will come out , which is very dangerous , so how can i perform this reaction safely

i need to prepare a catalyst (aluminium chloride ) , it is a product of the aluminium reaction with hydrochloric acid . BUT the problem is ; Hydrogen gas will come out , which is very dangerous , so how can i perform this reaction safely

Determination of catalyst life cycle

I want to carry out geometry optimization of silver supported catalyst on alumina (Ag/Al2O3) using material studio Dmol3 tool. However for my current parameter set the job has not been successful. Any suggestion will be highly appreciated

all of alkoxy groups of Titanium

Laboratory Research

What should be Solvent and Catalyst Ratio in Claisen-Schmidt Condensation Reaction?

Please tell me in detail.

I want the "Sn" to hang on the end of the polymer,but experiments have been failing lately,do you have any suggestions?

I am trying to prepare a Ni-based catalyst(Ni/Ce2O3) by co-precipitation method. I was wondering what is the best precipitation agent and PH.

I am looking for examples where markets have developed mainly through public procurement as a consumer rather than via policy making.

Hi everyone,

If I want to doping Co in NiFe2O4 with 3 wt%,

For example, Fe(NO₃)₃.9H₂O (1 g), Ni(NO₃)₂.6H₂O (1 g) and Co(NO₃)₂·6H₂O (3wt%). So, 2 g x 3/100 = 0.06 g of Co(NO₃)₂·6H₂O. The result will be (0.97 g for Fe(NO₃)₃.9H₂O and Ni(NO₃)₂.6H₂O) and (0.06 for Co(NO₃)₂·6H₂O), With the appropriate solvent.

Please, Let me know if I’m wrong and correct me.

thank you in advance.

For HER reaction for a halide based photocatalyst I get the different results of hydrogen after all repeated result even experimental conditions are same.

How is tristyrylphenol is produced and which catalyst is used industrially?

Editors: Miltiadis D. Lytras, Afnan Alkhaldi, Sawsan Malik

Publisher: Emerald Publishing

Emerald Studies in Active and Transformative Learning in Higher Education,

https://www.emerald.com/insight/publication/acronym/ESATL

This volume serves as a reference edition for the challenges, opportunities, risks and adoption of Artificial Intelligence in all aspects of Higher Education. With emphasis on the diverse facets of the AI, namely procedural, methodological, technical and ethical this book covers in a holistic way the evolution of the AI in Higher Education. Case Studies, Lessons Learnt and Research and Development Projects of the utilization of AI in Higher Education are also covered promoting the debate on the future of AI in Higher Education

The aim of this volume is to cover the excessive needs of faculty, administrators, policy makers and stakeholders in the Higher Education industry on timely and trusted knowledge on the impact of the Artificial Intelligence in the Higher Education Institutions and Ecosystem. Our volume is one of the first efforts to accommodate in a single volume the diverse aspects of the phenomenon with a constructive, progressive approach aiming to investigate the positive footprint of the application of the AI in the HE.

The selected structure of our volume is also representative of our own unique strategy. The following are the sections that will host the chapters:

In this book, there is an integrated coverage of significant items in the relevant agenda providing a unique value proposition for the relevant area. The following list is indicative and not exhaustive.

This edition can serve as a reference edition as well as a teaching book for postgraduate studies on the relevant domain.

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Editors (send your abstract to any of them)

Miltiadis D. Lytras, Effat University, Saudi Arabia, miltiadis.lytras@gmail.com

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Sawsan Malik, Arab Open University, Kuwait Branch, Kuwait, smalik@aou.edu.kw

The photodegradation experiment materials included RhB, catalyst (catalyst does not include carbon or carbon compounds), crystallizing dish, and magnetic stirrer. After 2 hours of irradiation, the RhB is decolorized by the catalyst, and the RhB dye color changes from pink to transparent (do not observe any pink on the catalyst). The mixture included Catalyst and RhB centrifuged for 10 min to remove the catalyst. The irradiated RhB and not irradiated RhB were filled into glass vials for TOC analysis. However, the results could not be accepted. The not irradiated RhB TOC concentration is large than the TOC of irradiated RhB. Wondering if any professor could give suggestions or comments.

What I am doing recently is to load bismuth oxybromide on foam nickel. The hydrothermal method is adopted. After hydrothermal treatment, foam nickel is dried in an 80 degree oven to degrade rhodamine. During the degradation process, catalyst particles will fall off. How can I make the catalyst load more firmly.

Hi all, I've read hundreds of articles on the use of TiO2 as a photocatalyst to degrade Methylene Blue from water. I have also conducted my own work on this particularly via the sol-gel route as well as nano powder slurries and nano powder immobilised in PVA crosslinked with PEG. I've replicated 10 or so methods from various papers, often with completely different results than they had. Actually with failures. The one thing I did not replicate, is when they specify they used a UVC (254nm) light, I did not. I always used an 11W UVA (385nm) light (replacing the bulb often for certainty. In trying to find what my error was, I switched to a UVC light and got the same results as the authors. I then removed the catalyst and also still got the same results, with a UVC light only. Indicating Methylene Blue was being degraded via Photolysis. My results always checked on a Thermo Helios Spectrophotometer with an absorbance peak of 664. My question is, are these research articles, none of whom described running a control without the catalyst, actually achieving photocatalysis in their lab reactors? Or are they being led to believe they've succeeded due to Photolysis? Why is no-one talking about removal of Methylene Blue via 254nm UVC light? My reactor is Quartz glass with the UVC light sitting externally and the reaction occurring under stirring. I have replicated it 8 times with the same results. When I switch to 385nm only, I get no removal of MB. When I install a TiO2 catalyst, I also get no changes. Clearly my catalysts are flawed but I've asked that in another question with no real answers so far.