Yuni Krisnandi

Universitas Indonesia, Depok, Indonesia · Chemistry

In this study, the atmospheric-pressure hydrogenation of CO2 was carried over bimetallic Ni-Ga catalyst supported on mesoporous carbon (MC). MC was successfully prepared using the soft-template method as proven by Fourier Transform Infra Red (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy - Energy Dispersive X-Ray Spectroscopy (SEM-ED...

The conversion of lignocellulose biomass to value-added chemicals is challenging. In this paper, the conversion process of diphenyl ether (DPE) as a model lignin compound to phenol and vanillin compounds involved a bifunctional catalyst in reaching the simultaneous one-pot reaction in mild conditions with a high yield product. The catalysts used in...

Ordered nanoporous materials have attracted much attention due to their unique pore architecture, tunable physicochemical properties, which find applications in a broad spectrum of catalysis, separation, adsorption, drug delivery, energy storage, and sensing. In the past decades, the amount of research on ordered nanoporous materials has grown incr...

As one of the most important gases that abundantly contribute to air pollution, methane becomes the most leading gas that challenges researchers to utilize it in more functional products such as methanol. In this study, the conversion process involved iron oxide species supported by sodium Y (NaY-Z) zeolite as the catalysts. This work highlighted t...

Sawdust of Oil Palm Empty Fruit Bunches (OPEFB/TKKS (Tandan Kosong Kelapa Sawit)) as a waste product from oil palm plants could be used as mesoporous carbon which was used as an adsorbent for Cu²⁺ and Cd²⁺ metal ions because it was a lignocellulose compound which had a hydroxyl (OH) functional group that could bind metals. This adsorption ability c...

This work demonstrated the use of green material catalysts, produced from Sengon sawdust waste, to obtain nanocellulose biopolymers. The green material catalysts were utilized as catalysts support of TiO2−ZrO2 binary oxide in the form of nanocomposite materials with superior synergistic properties. The isolation of nanocellulose was achieved using...

Alkyl polyglycosides (APGs) are classified as non-ionic and green surfactants that can be synthesized from renewable materials such as glucose and fatty alcohol. APGs are commonly applied as surfactants in enhancing oil recovery (EOR) since APGs exhibit excellent interfacial activities, emulsified abilities, foaming performance, and wettabilities....

The continuous increase of CO2 concentrations in the atmosphere for decades has influenced the global climate change. Efforts to overcome the high concentration of CO2 need to be done, one of which is the Carbon Capture and Storage (CCS) method through CO2 capture on an adsorbent. In this research, mesoporous carbon impregnated with NiCl2 (NiCl2/MC...

Pandemi Covid-19 yang melanda seluruh dunia berimbas ke berbagai ranah kehidupan masyarakat. Efek Covid-19 juga dirasakan oleh para santri Pesantren Darussalam Sumenep. Di masa pandemi ini, para santri dihadapkan pada pilihan kembali ke rumah atas desakan ekonomi, atau tetap bertahan di pesantren. Santri yang bertahan di pesantren perlu mematuhi pr...

Carbon sequestration via the carbon capture and storage (CCS) method is one of the most useful methods of lowering CO2 emissions in the atmosphere. Ethylenediamine (EDA)- and triethylenetetramine (TETA)-modified mesoporous carbon (MC) has been successfully prepared as a CO2 storage material. The effect of various concentrations of EDA or TETA added...

Carbon dioxide is a highly potential renewable C1 source for synthesis of fine chemicals. Utilization of CO2 in carboxylation reactions requires catalysts, such as: nickel complex for CO2 activation. However, the use of homogeneous catalysts in the reaction is still less efficient due to the difficulty of separating the product and catalyst from re...

Capturing carbon dioxide using porous materials such as zeolite and metal–organic frameworks (MOFs) could be one of the best efforts to reduce greenhouse gas emissions. This study was aimed at investigating the effect of the addition of Indonesian activated natural zeolite (ANZ) into MOF-type Materials of Institute Lavoisier (MIL-100(Fe)) on their...

Carbon dioxide (CO2) is a compound that can potentially be used as a carbon source in the synthesis of fine chemicals. However, the utilization of CO2 is still constrained due to its inert and stable nature. Therefore, the presence of a catalyst is needed in CO2 conversion. This study aims to synthesize copper impregnated mesoporous carbon (Cu/MC)...

Biphenylene-Bridged Periodic Mesoporous Organosilica (Bph-PMO) has been successfully synthesized using sol-gel method in the presence of Octadecyltrimethylammonium bromide (ODTMABr) surfactant as a template. Furthermore, Bph-PMO has been functionalized using amine (NH 2 -Bph-PMO) in a two-step reaction, comprising nitration using HNO 3 65% / H 2 SO...

Partial oxidation reaction of bio-methane as a source of methane using ZSM-5 heterogeneous catalyst modified with iron oxide has been carried out. In this study, the ZSM-5 catalyst was synthesized using the double template method using kaolin and natural zeolite as silicate and aluminate sources. The as-synthesized ZSM-5 nat and the Fe 2 O 3 /ZSM-5...

Hierarchical ZSM-5 has been successfully synthesized from Bayat natural zeolite as alumina and silica source and Bangka kaolinite as an additional silica source using tetrapropylammonium hydroxide (TPAOH) and poly(acrylamide-co-dialyldimethylammonium chloride) (PDDA-M) as a structure and pore directing agent. XRD pattern shows an evidence of MFI (M...

Lanthanum and Iron-Metal Organic Frameworks (La-MOFs, Fe-MOFs) have been successfully synthesized through solvothermal method and applied as catalysts to convert glucose into 5-Hydroxymethylfurfural (5-HMF). 5-HMF is a very promising energy source which extensively used in chemical industries and polymer materials. MOF is used as source of Lewis an...

In this study, both soft and hard templated mesoporous carbon (ST MC and HT MC) were synthesized using phloroglucinol as carbon precursor. The templates used in soft and hard templated MC synthesis were Pluronic 127 (F-127) and SiO 2 , respectively. The resulting mesoporous carbon were then impregnated with Ni and characterized using FTIR, SEM-EDS,...

Corrosion often occurs in oil and gas industries’ pipelines indicated by a decrease in quality which is harmful to the industries and environment. To slow down the corrosion rate, a corrosion inhibitor is needed. Organic corrosion inhibitors are more widely used than inorganic ones due to its effectiveness and non-toxic. One of the most widely used...

Sorghum bicolor stem is one of the biomass wastes that can be used as raw material for synthesizing platform chemicals. Levulinic acid is one of the chemicals that is currently a substance often synthesized or isolated. Levulinic acid can be catalytically synthesized from sorghum stem waste which is rich in cellulose. Cellulose in the sorghum stem...

Lignin isolated from wood waste biomass, contains 61.07 % of lignin, was converted to vanillin using ZSM-5 catalysts. Prior to use, wood waste biomass was delignified to enrich its lignin contents followed by added 10 % H 2 SO 4 to isolate the lignin such as solid black material. Three types of ZSM-5 catalysts i.e. hierarchical ZSM-5, NiO/hierarchi...

Metal-organic Framework (MOF) as a porous material has a potency for an organic dye adsorbent due to its tunable pore size. It can be a good candidate for selective separation of organic dye waste because of its organic functionality, high thermal and stability. In this study, MOF based on cobalt (Co) and iron (Fe) cations with succinic acid ligand...

SiO2 was extracted from kaolin using concentrated HCl and HNO3 mixture and used as solid support for both Bronsted (HClO4 and H2SO4) and Lewis Acid (AlCl3 and ZnCl2). Before extraction, kaolin was calcined at 800°C for eight hours to form metastable kaolin. After the extraction procedure, silica was recovered in 51.6% yield. Silica and the resultin...

Lignin derived from lignocellulose biomass such as oil palm empty fruit bunches (OPEFB) was converted into vanillin through depolymerization reactions in the presence of NiO/HY zeolite. Beforehand, lignin was isolated from black liquor from delignification of oil palm empty bunches using sulfuric acid (19% acid insoluble lignin). Zeolite NaY as a c...

Rhodamine B is a basic (cationic) dye that is used in paint, textile, and paper industries which is very dangerous for the environment and human health when exists above 14 ng/L, its detection limit (LOD). Physical processing using the adsorption method was chosen in this study because of its effectiveness in absorbing various pollutants. A porous...

Rice husks contain many compounds, one of them is cellulose that can be converted to levulinic acid (4-oxopentanoic acid). Rice husks need to be pretreated to get larger amount of cellulose so that the yield of levulinic acid is higher. Prior to pre-treatment, rice husks were grinded and sieved, followed by dewax. In this study, rice husks were pre...

As the second highest countries in producing oil and gas energy, Indonesia cooperates with petroleum industry to approach the oil supply. They will put their oil refineries under the sea, which tends to get corrosion. Therefore, it is important to synthesize additive compounds having a function as corrosion inhibitor. In searching of corrosion inhi...

Utilization of fossil fuel, charcoal, oil, and natural gases, which are carbon-rich materials, is widely used for human sustainability. However, utilization of such materials contributes to higher atmospheric CO2 concentration. The increase of CO2 emission leads to higher temperature and climate change due to ‘greenhouse effect’. Therefore, convers...

Carbon dioxide is one of the main gases that cause greenhouse gas emissions in the atmosphere. One way to reduce gas emissions is to convert CO2 and produce high-value products. Because it is atmospherically inert, catalyst assists CO2 to react with other compounds. In this research, hierarchical ZSM-5 was prepared from natural minerals as sources,...

Methane is one of the most useful gas that can be used directly as fuel. Nevertheless, toxic gas emission after used is still at high number while its efficiency is still very low. On the other hand, methane can be converted to methanol via partial oxidation reaction for further use. In this study, HY zeolite, synthesized from kaolin impregnated wi...

Imidazoline is an organic compound that widely used as a corrosion inhibitor. Based on its structure, imidazoline is a heterocyclic compound having a pendant group and hydrocarbon chain which important for its activity as corrosion inhibitor. This research was conducted to modify the imidazoline structure to increase its activity in inhibiting corr...

In this study, Nickel nanoparticles/reduced graphene oxide was successfully prepared through an in-situ hydrothermal process by applying graphene oxide as a precursor that was applied as a catalyst for converting CO2 into CH4. NiNPs/rGO were characterized using UV-Vis spectrophotometer, Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), Sc...

Conversion of carbon dioxide into other compounds nowadays have been widely carried out. However, the conversion is still difficult because CO2 is inert and stable at high temperatures. So it requires an assistance from low- valence metal catalysts such as Ni(0) and Pd(0). In this work, ZSM-5 was synthesized using Bayat–Klaten natural zeolite and B...

One of the most important sources for human’s life is water. However, nowadays water cannot be used properly due to the large amount of heavy metal that contaminates the water such as cadmium (Cd). Therefore, Metal Organic Framework (MOF), one of the porous materials used in the application for water treatment due to its large pore and surface area...

Mesoporous carbon was successfully synthesized from glucose using MCM-41 as the hard template to be applied as the working electrode in EDL supercapacitors. The as-synthesized mesoporous carbon was characterized using Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), Brunauer Emmet Teller (BET) Surface Analyzer, and Scanning Electron Micr...

As the world’s largest palm oil producer, Indonesia is subjected to utilize palm oil as a precursor of alkyl polyglycoside (APG) synthesis for Enhanced Oil Recovery (EOR) application. In this study, the optimization of APG C-4 synthesis as an intermediate product was conducted to maximize the APG C-12 conversion in further synthesis by referring to...

In this work, imidazoline-palmitic derivative had been successfully synthesized by reacting triethylenetetramine (TETA) with palmitic acid (PA). Synthesis process was performed with solvent free using MAOS (Microwave Assisted Organic Synthesis) method with variation of time reactions. Dean-Stark and reflux methods using xylene as a solvent were als...

Imidazoline is a heterocyclic compound containing nitrogen atom, which is wellknown in industry, especially in petroleum field as a corrosion inhibitor of oil refineries in sea environment. In searching of potential organic compounds for corrosion inhibitor, imidazoline-lauric derivative had been successfully synthesized by reacting triethylenetetr...

Oil palm empty fruit bunch (OPEFB) is one of the potential biomasses containing cellulose that can be used as a source for renewable energy. However, the cellulose is tightly connected with lignin in lignocellulose system, which needs to be separated, so called delignification, before being used. To investigate the effect of delignification on conv...

The non-food biomass, sweet sorghum ( Sorghum bicolor ) bagasse (SSB), can be a possible source for synthesis of platform chemical such as levulinic acid (LA). It contains high sugar derived from cellulose and hemicellulose. Delignification process of SSB becomes important due to accessibility to those sugars. In this work, the effect of different...

Conversion of carbon dioxide (CO 2 ) into other compounds has become very advantageous because of the abundance in the atmosphere. However, carbon dioxide (CO 2 ) is thermodynamically and kinetically stable so it needs low valence metal such as Ni(0) to be activated and react with other compounds. In this study, nickel metal-impregnated ZSM-5 was p...

This study presents a partial oxidation of biomethane from anaerobic organic waste of cow dung (83.7 % of methane and 16.3 % of oxygen) to methanol using modified cobalt and iron metal oxide-hierarchical ZSM-5 catalysts. Hierarchical ZSM-5 was synthesized using double template methods with tetrapropylammonium hydroxide (TPAOH) and dimethyl diallyl...

Tannins are secondary metabolites in Mango (Mangifera indica L.). This compound has a cluster of polyphenols as functional ligands for chelating Cu(II). Cu(II)-imprinted polymer-tannin (Cu-IP-tannin) was successfully synthesized by polymerization of phenol and formaldehyde with the complex of Cu(II)-tannins in acidic medium. Non-imprinted polymer (...

In this research, carboxylation reaction of phenylacetylene with CO 2 has been studied using impregnated nickel on mesoporous carbon as catalyst. Mesoporous carbon was successfully synthesized using a soft template method with Pluronic F127 as pore template, and formaldehyde and phloroglucinol as the carbon source. This material was characterized w...

Microporous ZSM-5 material was synthesized using natural aluminosilicate minerals, i.e. Bayat zeolite and Bangka kaolin as silica and alumina sources. Prior to use, Bayat zeolite was treated with several treatments, i.e. purification, fragmentation and dealumination. While Bangka Kaolin was used as the source of additional silica, in which the sili...

Microporous ZSM-5 was successfully synthesized using Bayat-Klaten natural zeolite and Belitung kaolin as its mineral source through 2 stages of treatment, i.e. pre-treatment of natural zeolite and kaolin followed by synthesis of ZSM-5 zeolite. Bayat-Klaten natural zeolite as source of Si and Al was first treated as follows: activation, purification...

Mesoporous carbon has been synthesized using soft-template method with phloroglucinol as carbon precursor and pluronic F127 as a template to form mesosize pores in carbon structure. The Brunauer-Emmett-Teller (BET) results prove the existence of hysteresis loop and adsorption isotherm type IV with total surface area of 432.498 m ² /g and pore diame...

The increasing circulation of unhealthy foods in various places threatens the community of malnutrition. One of which is the intake of cholesterol nutrition. When the normal limit is exceeded, it can trigger the spread of various diseases such as coronary heart disease. To anticipate the outbreak of the disease, a practical, stable, simple, and rel...

Delignified rice husk waste (25.66% (wt) cellulose) was converted to levulinic acid using three types of manganese catalysts, i.e., the Mn3O4/hierarchical ZSM-5 zeolite and Mn3O4 heterogenous catalysts, as well as Mn(II) ion homogeneous counterpart. The hierarchical ZSM-5 zeolite was prepared using the double template method and modified with Mn3O4...

We synthesize mesoporous carbon by using the soft-templated method with pluronic F-127 as a structure-directing agent, and phloroglucinol and formaldehyde as carbon precursors. The as-synthesized mesoporous carbon was characterized by using x-ray diffraction, Brunauer, Emmett and Teller (BET), scanning electron microscopy (SEM), energy dispersive x...

Currently, the development of plastics that can be easily decomposed is attracting attention, especially for the conversion of polymer-based materials such as modified polyvinyl alcohol (PVA) into composites. Bio-nanocomposites were prepared using the solvent casting method of PVA and organoclay as the matrix and nanofiller, respectively. In this s...

In this study, composite materials consisting in HKUST-1 [Cu 3 (BTC) 2 ] (BTC: benzene 1, 3, 5-tricarboxylate) and an Indonesian activated natural zeolite (ANZ) from Klaten, Central Java, were successfully prepared and characterized. The purpose of this research was to determine the effect of the combination of these two materials on the characteri...

Grass-like structured mesoporous carbon was prepared by the soft-template method using triblock copolymer Pluronic F127, affording an organic–organic composite structure between phloroglucinol and formaldehyde. Thermogravimetric analysis revealed that the as-synthesized mesoporous carbon is stable to 900 °C, and X-Ray Diffraction (XRD) analysis con...

In this research, imidazoline-linoleic derivative from triethylenetetramine (TETA) and linoleic acid (LNA) were successfully synthesized with solvent free using MAOS (Microwave Assisted Organic Synthesis) method in variation of reaction time. TETA-LNA imidazoline was in mixture with imidazoline-oleic derivative with the optimum mass of 1.70 g at 9...

In searching of an alternative organic compound for corrosion inhibitor, ethylenediamine-derived imidazoline was successfully synthesized by reacting ethylenediamine (EDA) with stearic acid (SA) using MAOS (Microwave Assisted Organic Synthesis) method with various reaction times. The optimum yield of EDA-SA imidazoline was 94.3 % at 5 min reaction...

A ytterbium–organic framework containing Lewis and Brønsted acid sites that effects transformation of glucose to 5-HMF in water at 140 °C.

Crystalline sodium Y (NaY) zeolite has been synthesized using alternative natural source of aluminate and silicate, extracted from natural Belitung kaolin. Prior to use, the natural kaolin was pretreated to obtain fragmented metakaolin and extracted silica. Synthesis was conducted with the addition of NaY gel (two types of NaY seeds were used, prep...

Conversion of methane to more reactive compounds such as methanol has drawn attention for many years. Hierarchical ZSM-5 zeolite has been used as support of metal oxide catalyst to facilitate the partial oxidation of methane to methanol. The NaZSM-5 zeolite was synthesized hydrothermally using double-template techniques, in which tetrapropylammoniu...

The metal–organic framework MIL-101(Cr) is known as a solid–acid catalyst for the solution conversion of biomass-derived glucose to 5-hydroxymethyl furfural (5-HMF). We study the substitution of Cr3+ by Fe3+ and Sc3+ in the MIL-101 structure in order to prepare more environmentally benign catalysts. MIL-101(Fe) can be prepared, and the inclusion of...