Questions related to Catalyst
Hi everyone, I would like to understand if there is a way to form heptyl acetate and heptyl heptanoate without the use of a reflux system (using only traditional glassware), and using a sulfuric acid catalyst. so far using the volume of 1.54ml heptanol, 7.44ml of heptanoic acid, and 3ml of acetic acid is not working. The heptanol smell is very much present.
I wish to know in detail about the Carbon balance for Perhydro Dibenzyltoluene dehydrogenation using Pt/Al2O3 catalyst. ? The inlet to the reactor is Perhydro Dibenzyltoluene (H18 DBT) and outlet products from the reactor might be H0DBT, H6DBT, H12 DBT, H18DBT and Hydrogen gas. How to identify the percentage composition of each.? Does I need to go for chromatography. ? Is there any alternative method to do that. Does anyone have prior experience in dealing with the Perhydro Dibenzyltoluene dehydrogenation and the analysis of its products? Thanks
In order to increase it applicability as a catalyst support for heterogeneous photocatalysis [photoelectrocatalysis]
I am synthesizing biodiesel from castor oil over polystyrene nanoparticles as catalyst. Two different phases are separated in the separating funnel.but when i try to separate them, the upper layer (biodiesel )comes first mixed with glycerol not the lower layer (glycerol). Please tell the reason behind this. Is this due to FFA content present in the oil
I am confused between the meaning of loaded and supported catalysts. Are these two terms same or different?
Please clarify my doubt.
I have used 0.04 g of catalyst in the reaction, which is equal to 0.02 mol%. How can I calculate TON and TOF for this heterogeneous catalyst
Does anyone know where to buy Hispec Pt/C catalyst?
I have asked fuel cell store, alfa asear and thermo scientific. The product was no loner available. So can anyone please tell me where can we buy Hispec Pt/C catalyst?
Thanks for your help
I am using a catalyst for HER in acidic conditions (0.5M H2SO4, Ag/AgCl, and Graphite). After 20-30 minutes of reaction at a constant potential, the current starts to decrease and half of the activity will be lost in 1 hour. but when I replaced the electrolyte its current and activity regained the original. Is it normal, which means the activity loss is due to electrolytes? In the case of CV, it is much more stable.
In terms of limitation of glassy carbon electrode.
What are the basic conditions to prepare heterogeneous catalyst by Incipient wetness impregnation method .ex.Pt/zeolite catalyst? thanks in advance
Hi guys,
I'm dealing with the synthesis of 1,1,2,2-tetrakis(4-aminophenyl)ethene follows the method in the reported paper. In which they used tin powder and concentrated HCl as reagents.
But I only obtained very low yield of desired product, the crude NMR shows the conversion was only 26%. I wonder if there is a procedure to activate Tin powder before using it in reaction?
Please check the attached for the original paper.
Please anyone who have experience about ILS unit please help me
I'm working on a DFT study of the catalytic properties of transition-metal-ion-doped crystalline cellulose coating in a gas reaction. I modeled it using a complex of a cellobiose and a metal ion with the reactant gas at the pre-reaction complex. But, my supervisor said that my model was too far from the real condition and did not meaningful as the solid coating was modeled in the gas phase. How to make a better one? Do you have any literature about it? Thanks
During transesterification, my solution become solidified when in the presence of basic catalyst (provided with heat and stirring). But on the other hand the solution is normal in acidic catalyst or in the absence of catalyst. What is the reason behind the solution getting solidified?
As I know, in dry impregnation method, predetermined amount of solution containing salts is absorbed by support powder (for example g-alumina). It is reported that the solution volume should be equal to the support pore volume. But, I am not sure how we could determine the exact volume of solution. could anyone help me about the issue?
thanks,
I need to know the complete calculation how much mol percentage of palladium is left after recycling my catalyst do that I can understand how much metal has leached from the prepared catslyst
I am looking for useful proposals for doctoral research in the field of internal combustion engines (thermal engineering).
Hi everyone,
I am doing ORR reaction in KOH, but mostly time catalyst ink was peel off from the surface of GC electrode, while ink was prepared in nafion solution, water and ethanol. Kindly give suggestion ?
I am eager to know whether the composition of heterogenous catalysts have any effect on the yield of biodiesel obtained through transesterification reaction? Is there any need to optimize and subsequently design customized catalyst giving higher yield?
I have trouble with foam formation during preparing catalyst slurry in milling step in an industrial scale milling apparatus. do you know how I can solve this problem?
Thanks,
Dear All,
I have a question to my dear polymer experts...
Is there any internal donors use in Avant Z501 and Z509 catalyst (for pipe grade and film grade)., (as in Avant Zn for PP, they use phthalate, diether, succinate etc as internal donors) I tried to find out, but I could not
Can you guys please help me? If uses, what are the ineternal donors
Heterogeneous catalysts (CaO, MgO, ZnO) have been shown to be less effective in low methanol and oil mole ratios. So, what is the best mole ratio for a heterogeneous catalyst in transesterification?
I am using Pt /Co catalyst for HER reaction in acidic medium.
The aim of this dissertation is to advance research on green hydrogen production by synthesis, characterization, and modeling of promising earth-abundant semiconductor CuFeO2 and MoN catalyst.
Hello, everyone. I need to find the electrostatic potential for my catalyst, but I didn't find the facet in TEM analysis. Is there any other way to determine the facet of a catalyst other than TEM? Thanks
Hello,
I'm looking for any additive to reduce the decomposition point of a dye. Any suggestions?
I have been reading a lot of papers on either side of the spectrum but have been finding it difficult how to understand which is which.
Can someone post a review or book or any piece of the written document as to how we can differentiate the two of them concerning photocatalytic reactions?
Does anyone know how we could reduce the nitric acid content in the catalyst slurry (because of NOx release during drying step) without viscosity increment. Does the acid replacement work? If so, what kind of acids do you suggest?
Thanks,
I need help to be able to model a GTL Fischer Tropsch Reactor in Aspen Plus using a cobalt catalyst, using a Langmuir-HinshelWood form for the rate equation.
I am very confused on how to start to model the ASF distribution in Aspen Plus . I saw a video on which someone was individually inputting each of the possible reactions but that doesn't seem right. Is there an easier way to model this?
Biodiesel production heterogeneous catalyst
Hi, everyone! I have a question about Aspen HYSYS / Unisim Design: What's rate units means? I work with heterogeneous catalytic reactions in a plug flow reactor (PFR), and most of these reactions are specified with kg,catalyst instead of volume. And these simulation softwares have cubic meter (m³) in rate units.
My question is: This cubic meter it's about what? Cubic meter of the reactor? Cubic meter of the catalyst? I need to know that information for units conversion (kg,catalyst to volume).
Hello all,
Can anyone help me with how one calculates the p-band center and what is the significance of it. For photocatalysis applications it is observed that p-band theory is helpful in explaining the behavior of catalyst.
I am doing experiments about oxidation process from limonene to limonene glycol, but the product are some limonene oxide (which I don’t want). These are the chemicals I have:
-Catalyst: CuY (zeolite Y supported by Copper); Cu/Fe spinel mixture.
- Solvent: dimethyl formanmit.
- TBHP and H2O2
- Method: Use reflux condense.
Can you give me some condition to improve the process (other chemicals, temperature, time…)?
I oxidize limonene in a 3-neck round flask, the main neck is connected to the condenser, I heat the limonene, catalyst (CuY or CuO/Y) at 60-70 Celsius Degree for 4, 6, 8, 10 hours. All of the samples (gas chromatography method) show high conversion rate but really low selectivity. Can anyone tell me how to increase it?
I would like to buy commercial catalysts to use in a Fischer Tropsch reaction but haven't had any good luck. Does anyone know of commercial suppliers of catalysts for this reaction?
Thanks
I oxidize limonene in a 3-neck round flask, the main neck is connected to the condenser, I heat the limonene, catalyst (CuY or CuO/Y) at 60-70 Celsius Degree for 4, 6, 8, 10 hours. All of the samples (gas chromatography method) show high conversion rate but really low selectivity. Can anyone tell me how to increase it?
In biodiesel production through transesterification, various of heterogeneous catalysts could be utilized. However, each heterogeneous catalysts are showed different yield. My question is What are the factors of heterogeneous catalyst that affect their activation during transesterification?
I am trying to optimise the kinetics of light weight hydrides using different catalysts.
Trying to know the best catalyst for sulfonamide synthesis
How to introduce a catalyst to stoic, Gibbs and Equil reactors?
Good morning, I am simulating a process in Aspen Plus and I need to introduce catalysts to the Stoic, Gibbs and Equil reactors. I can't find a way to do it. Please, could you help me?
I am doing acetilization of cyclohexanone with methanol with molar ratio1:4. The weight of catalyst, zsm-5 is 0.04g. How to calculate the reactant to catalyst ratio?
Hi everyone I want to test the electrocatalytic activity (Overall potential at 10 mA/cm2 and long-term stability) of my Bifunctional electrodes in a two-electrode system which means that I have to take both anode and cathode of the same materials. I am a bit confused about the setup and how will I assemble my experimental setup (Potentiostat) to measure these parameters? Expert answers will be highly appreciated.
I am currently working with an experiment producing biodiesel from a heterogeneous catalyst. After the reaction I have to recover the catalyst after the reaction is over. I hope to use the centrifugal method to bind the catalyst to the surface of the centrifugal tube as a Pellet. However, I can not take the bound catalyst superficially.
How i can recovered this heterogeneous catalyst?
Novel 2D MBenes: 2D transition metal borides are the very promising catalyst for electrochemical ammonia NH3 synthesis
I can not seem to find much research about the topic, so if anyone has done some research on the topic I would greatly appreciate advice. Thank you.
In transesterification some of heterogeneous catalyst such as BaO, SrO, MgO, and CaO shows different biodiesel yields. In general, BaO and SrO show high activity than MgO and CaO. My question is how these compounds do have different catalytic activity?
We need to characterize a few ceramic composite materials using chemisorption to find out the percentage of active metal surface area.
We are also looking for other methods that would help us find the active metal content reliably. It would be of great help to know if there are other techniques that could help us understand our catalyst better.
Thanks
Our research group cannot find suppliers of TiCl4 locally and our access to school laboratory is very limited due to pandemic. We are looking for ways on how to synthesize TiO2-rGO composite for our study using simple equipment only. Would you please help us in this?
For your reference, here is the original method:
SYNTHESIS OF TiO2@rGO COMPOSITES
The TiO2-rGO composite will be synthesized via the typical chemical method. Reduced graphene oxide (0.1 g) and 260 mL of 0.1 M titanium chloride (TiCl4) aqueous solution will be subjected to magnetic stirring for 0.5 hours at 80˚C. The mass ratio of TiO2 to rGO is based on the results of several studies indicating that the optimum concentration for the latter is 2 wt % 13,14. Slowly, 260 mL of 0.4M NaOH will be added under constant stirring for 3 h. The mixture will be washed with deionized water and ethanol five times; the former is for adjusting the pH to 7 while the latter is for better dispersion of the molecules. The formed product will be recovered using filter papers. Finally, it will be dried at 80˚C for 4 h.
Hello everyone,
My PhD research includes degradation and stability study of fuel cell Pt/C catalysts for ORR. This is a new area of research, both for me (I'm coming from TEM background) and my lab, which is why I'm learning most experimental procedures and parameters from papers rather than more experienced colleagues.
Unfortunately, it seems to me that there's no agreement in electrochemical community regarding said procedures/parameters and here I would like to specify what causes my confusion:
- regarding CV and LSV procedures, from what I've already read and from my experimental data, it seems that scan speed influences ECSA data (extracted from H2 adsorption region on cyclic voltammograms) and activity data (extracted from linear scan voltammograms). Yet, I see different papers publishing data obtained with different parameters, which for me makes the results virtually impossible to compare. Additionally, some procedures include the so called electrochemical cleaning and stabilisation of the working electrode by performing 40-100 CV scans with higher speeds (100-200 mV/s), yet some papers seem to omit it. With LSV some procedures call for background subtraction of LSV data obtained from the measurement performed in N2 saturated electrolyte but again, not all papers include that step (yet both approached seem to be acceptable for publication).
Regarding accelerated degradation testing, the procedures seem to be a lot more all over the place:
-different scan speeds
100-500 mV/s, and from my experimental data I already see that scan speed influences degradation rate,
-different approaches to experiment
continuous scan vs 'sample and hold' (square wave) scan,
-different potential ranges
lower limit being 0,4 - 0,6 V, higher 0,9 - 1,2 V for operating condition testing, start-stop testing seems to be consistant 1 - 1,5 V,
-different "atmosphere" of electrolyte
O2 saturated, deoxygenated and "as prepared" electrolyte, all of those seem to be leading to publishable results.
So to sum up my stream of consciousness:
I'm not looking for specific experimental parameters (although getting some suggestion on those would be more than great) but rather some insight on the general consensus in electrochemical community regarding said parameters and why discrepancies in them seem to be widely accepted. Also, if someone feels like they have more spare time than they can utilise, I would be more than willing to participate in an internship in a unit focused on degradation/stability study of catalysts.
Thank you and have a great day,
Szymon
How to calculate TON and TOF for Graphite Oxide catalyst?
How to determine the catalyst amounts of organic polymer? (Porous organic polymer, PIM, etc)
I just want to know how to defined their molecular weight except of GPC. (Since it's insoluble to organic solvents.)
Dears
I am doing some experiments in aldol condensation reaction and I noticed that the activity of the spent catalyst is higher than the fresh one.
Any suggestion regarding this finding will be appreciated
Dear colleagues,
I am trying to synthesize the ABO3 perovskite structure by using nitrate precursors via sol-gel method. Previously, everything seemed fine but recently the activity during the redox experiments is near zero even for the same catalyst system that worked fine previously. Just trying to figure out what could go wrong. Any comments or suggestions would be much appreciated.
Thanks in advance.
CO-NH bond breaking without catalyst.
I have Co/Al2O3 catalysts and carbon is deposited on the surface by decomposition of light hydrocarbon on the surface of catalysts, therefore the catalysts are containing cobalt carbides and some deposited carbon on the surface. By increasing the decomposition temperature, the content of carbon on the surface of the catalyst increased and the G and D bands were observed, while for the other samples (with lower gas decomposition temperature) there is not any G and D bands, while the 2D band with lower intensity and broader was observed in these samples. According to our XRD analysis, for the samples prepared at lower decomposition temeprature (No.1, 2, 3, 4) without G and D band and with only weak 2D band at 2670 cm-1, we have some cobalt carbides species, while for those with G, D and 2D bands (No. 5, 6) there was not any peak belong to cobalt carbides in XRD spectrum. I would like to know your opinion about the band at 2670 cm-1 in these Raman spectrums.
Thanks in advance.
Scientist-entrepreneur Javier Garcia Martinez recalls combining an academic role at the University of Alicante, Spain, while getting a catalyst start-up called Rive Technology off the ground.
The experience, he says, taught him that a so-called barrier between academia and other sectors is no more than a state of mind. “To me, it feels all part of the same thing. It’s our own mindset that puts different activities in different silos,” he tells Julie Gould. Martinez adds: “I was studying, discovering better catalysts, you know, in my academic lab, also in my company, and at the same time talking to customers, to investors, to raise money, and to put that into a commercial plan.
1. How does oxygen concentration/saturation in electrolyte plays an important role in ORR reaction?
2. What will happen if the oxygen concentration/saturation is less in electrolyte?
is the onset potential of ORR activity or current density may fall down? if yes means why?
please attach any related literature...
Catalyst turns carbon dioxide into gasoline 1,000 times more efficiently
by Andrew Myers , Stanford University
"We can create gasoline, basically," said Cargnello, who is an assistant professor of chemical engineering. "To capture as much carbon as possible, you want the longest chain hydrocarbons. Chains with eight to 12 carbon atoms would be the ideal......................
https://phys-org.cdn.ampproject.org/c/s/phys.org/news/2022-02-catalyst-carbon-dioxide-gasoline-efficiently.amp
We are using the Nafion binder for the preparation of catalysts inks for electrochemical studies. In which way the Nafion can protect the catalysts layer from the electrode surface? what will be the mechanism taking place there?
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How the Sabatier principle can define the facile path of determining the best catalyst for a specific catalytic reaction.
What is the behavior of furfural in contact with weak acidic catalyst?
when pH,amount of catalyst and concentration of the dye are considered
I am working on water splitting applications. I have taken 1 by 1 cm piece of Ni foam and deposited 0.0056 g of my catalyst. Now, in next step, i have to convert my observed current values to current density. therefore, I have to divide by geometric surface area.
my question is that, how I will calculate GSA of 1 by 1 Ni foam where I have deposited 0.0056 g of catalyst.
Good morning.
Does anyone know how oxygen activation occurs on CeO2 catalysts by platinum addition? I have read articles that mention that this occurs, however they do not explain how or why it happens. thanks.
Different pH of water entering in an Aeration Tank is mixed as CO2 is utilized as a catalyst. The amount of CO2 as catalyst is unknown.
Please elaborate, how to design an experiment for better yield optimization with minimum experiments. I have four variables, mole ratio, temp, time, catalyst loading, and sometimes instead of a cat. loading I use microwave watt power
Dear Experts, In order to apply carbon dots (CDs) for the removal of analytes, why do we need to encapsulate these nanodots with other materials? Is it possible to use CDs as a lone adsorbent? Thanks in advance for your valuable comments.
Methanol synthesis
Copper-based catalysts (Cu/ZnO/Al2O3 Catalysts)
Performance of Cu/ZnO/Al2O3 Catalysts (Activity, selectivity and stability)
Price of Cu/ZnO/Al2O3 Catalysts
Low Pressure process of Methanol Synthesis
Methanol synthesis From Natural Gas
I want to use Ru-al2o3-Zeolite catalyst in pellet form to perform the reaction in the flow reactor. Please suggest me ideal pressure to pelletize it and the ideal size of the pellet.
I have been convinced by the concept of direct desulfurization of crudes. The commercial development in this technology will help ridding off the require the of mutilpe reactors with different ranges of Catalytic beds in the modern petroleum refinery.
Hi all,
I have prepared Pd supported heterogenous catalyst by liquid media assisted reduction method. From the XPS it was observed that the surface is composed of both Pd+2 (as the major species, ~65%) as well as Pd(0). However, in XRD, the Pd+2 peak is not prominent and the intensity is very less compared to the Pd(0) peak intensity, although Pd+2 % is very high. Why it is so?
Thanks in advance...
Please suggest a method to determine this practically. Please avoid mentioning the publications having the final results. The guidelines or procedure for measurement is required. Any related discussion or fruitful comments are warmly welcomed.
I have done hot filtration test for the catalyst to show leaching and I found no reaction after filtration. So, is it still necessary to perform ICP analysis of the catalyst??
In rigid polyol synthesis to neutralize KOH (catalyst) finally we are adding disodium acid pyrophosphate. But it unable to completely neutralize KOH. Why?
in oil refineries which the catalyst as Co&Mo&W on Al2O3 supported
and what perfect mechanize to this reaction(hydrodesulfurization)