Copper/Nickel/Manganese Doped Cerium Oxides Based Catalysts for Hydrogenation of CO₂

Toemen, Susilawati,Bakar, Wan Azelee Wan Abu,Ali, Rusmidah Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8

The recycling technology by the catalytic conversion is one of the most promising techniques for the $CO_2$ treatment of coal burning power plant flue gases. The conversion of $CO_2$ to valuable product of $CH_4$ can be used as a fuel to run the turbine for electricity generation. Through this technique, the amount of coal needed for the combustion in a gas turbine can be reduced as well as $CO_2$ emissions. Therefore, a series of catalysts based on cerium oxide doped with copper, nickel and manganese were prepared by impregnation method. From the characterization analysis, it showed that the prepared catalysts calcined at $400^{\circ}C$ were amorphous in structure with small particle size in the range below 100 nm. Meanwhile, the catalyst particles were aggregated and agglomerated with higher surface area of $286.70m^2g^{-1}$. By increasing the calcination temperature of catalysts to $1000^{\circ}C$, the particle sizes were getting bigger (> 100 nm) and having moderate crystallinity with lower surface area ($67.90m^2g^{-1}$). From the catalytic testing among all the prepared catalysts, Mn/Ce-75/$Al_2O_3$ calcined at $400^{\circ}C$ was assigned as the most potential catalyst which gave 49.05% and 56.79% $CO_2$ conversion at reaction temperature of $100^{\circ}C$ and $200^{\circ}C$, respectively.

Copper/Nickel/Manganese Doped Cerium Oxides Based Catalysts for Hydrogenation of CO2

Susilawati Toemen,Wan Azelee Wan Abu Bakar,Rusmidah Ali 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8

The recycling technology by the catalytic conversion is one of the most promising techniques for the CO2 treatment of coal burning power plant flue gases. The conversion of CO2 to valuable product of CH4 can be used as a fuel to run the turbine for electricity generation. Through this technique, the amount of coal needed for the combustion in a gas turbine can be reduced as well as CO2 emissions. Therefore, a series of catalysts based on cerium oxide doped with copper, nickel and manganese were prepared by impregnation method. From the characterization analysis, it showed that the prepared catalysts calcined at 400 oC were amorphous in structure with small particle size in the range below 100 nm. Meanwhile, the catalyst particles were aggregated and agglomerated with higher surface area of 286.70 m2g−1. By increasing the calcination temperature of catalysts to 1000 oC, the particle sizes were getting bigger (> 100 nm) and having moderate crystallinity with lower surface area (67.90 m2g−1). From the catalytic testing among all the prepared catalysts, Mn/Ce-75/Al2O3 calcined at 400 oC was assigned as the most potential catalyst which gave 49.05% and 56.79% CO2 conversion at reaction temperature of 100 oC and 200 oC, respectively.

Removal of naphthenic acids from high acidity Korean crude oil utilizing catalytic deacidification method

Nurasmat Mohd Shukri,Wan Azelee Wan Abu Bakar,Jafariah Jaafar,Zaiton Abdul Majid 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-

Catalytic deacidification is a fascinating method to decrease the naphthenic acids (NAs) concentration ofhighly acidic petroleum crude because these acids caused serious corrosion in refinery equipment. Korean crude oil with a total acid number (TAN) of 8.32 mg KOH/g was used to test the performance ofcatalytic deacidification technology. A basic chemical with a dosing of 4% ammonia solution inpolyethylene glycol (NH3–PEG) was used as the acid removal agent with concentrations of 100, 500, and1000 mg/L. Cerium oxide, zinc oxide and tin oxide based catalysts supported onto alumina prepared withdifferent calcination temperatures and types of dopants were used to aid in the deacidification reaction. The potential catalyst was characterized by BET, EPR and CO2-TPD for its physicochemical properties. The results showed 93.3% reduction for Korean crude oil using Cu/Ce (10:90)/Al2O3 calcined at 1000 8C. This catalyst has the highest BET surface area of 87.12 m2/g with higher dispersion of Cu2+ species on theCeO surface detected using EPR spectra and higher total basic site measured using CO2-TPD. Theseproperties contributed to the excellent catalytic performance which remove the NAs in the Korean crudeoil and concurrently reduced the TAN value below than one.

Optimization of extractive desulfurization of Malaysian diesel fuel using response surface methodology/Box–Behnken design

Wan Nur Aini Wan Mokhtar,Wan Azelee Wan Abu Bakar,Rusmidah Ali,Abdul Aziz Abdul Kadir 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-

Systematic experiments were conducted to investigate the most appropriate extraction conditions forsulfur reduction. Initial extraction studies showed that DMF was the most potentially effective solvent. The influence of DMF to diesel ratios, extraction times and temperatures, addition of co-solvent, solventmixtures, double extractions were explored. The use of co-solvent and solvent mixtures showed poorefficiencies of sulfur removal. A two-stage extraction with ratio of 1:1 (DMF/Diesel) was successfullyremoved over 88.0% of sulfur in diesel. Under Box–Behnken design, the model showed that maximumextraction ability was observed at 30 8C, 30 min and 1.0 of DMF/diesel ratio to achieved 67.5%.

Catalytic neutralization of acidic crude oil utilizing ammonia in ethylene glycol basic solution

Norshahidatul Akmar Mohd Shohaimi,Wan Azelee Wan Abu Bakar,Jafariah Jaafar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

Naphthenic acids in crude oil is a main contributor to the corrosion problem in the petroleum industry and removal of these acids from the crude oil fraction become a great concern nowadays. Catalytic neutralization is an alternative technique to be investigated in this study. A basic chemical with a dosing of 0.4% and 4% of ammonia solution in ethylene glycol (NH3-EG) were used as the acid removal agent with a concentration of 100 mg/L, 500 mg/L, and 1000 mg/L for three different crude oils which are Petronas Penapisan Melaka heavy (crude A) and light crude (crude B) and Korean crude (crude C). A series of alkaline earth metal oxide catalysts; calcium, barium and magnesium supported onto alumina with different calcination temperatures were used to enhance the reaction. The results showed 67.4% (3000 mg/L of 4% NH3-EG) reduction in TAN for crude A and 78.7% (10,000 mg/L of 4% NH3-EG) reduction for crude C by using the best studied catalyst which was Ca/Al2O3 with a calcination temperature of 1100 8C. For crude B, there was 71.2% reduction of TAN with 1000 mg/L of 0.4% of NH3-EG. Additionally, based on the results obtained, a mechanistic naphthenic acid reduction reaction pathway was postulated.

Alumina supported polymolybdate catalysts utilizing tert-butyl hydroperoxide oxidant for desulfurization of Malaysian diesel fuel

Wan Nazwanie Wan Abdullah,Wan Azelee Wan Abu Bakar,Rusmidah Ali 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10

The performance of oxidative desulfurization (ODS) of commercial diesel by alumina supported polymolybdate based catalyst system was studied using tert-butyl hydroperoxide (TBHP) as an oxidizing agent. From catalytic testing, MoO3-Al2O3 calcined at 500 oC was the most potential catalyst which gave the highest sulfur removal under mild condition. The sulfur content in commercial diesel was successfully reduced from 440 ppmw to 105 ppmw followed by solvent extraction. Response surface methodology involving Box-Behnken was employed to evaluate and optimize MoO3/Al2O3 preparation parameters (calcination temperatures, molybdenum loading precursor and catalyst loading), and their optimum values were found to be 510 oC, 0.98 g and 11.18 g/L of calcination temperature, molybdenum loading precursor and catalyst loading, respectively. Based on results, the reaction mechanism for oxidation of sulfur compounds to the corresponding sulfones occur in the presence of MoO3 /Al2O3 catalyst was proposed.

Optimization and physicochemical studies of alumina supported samarium oxide based catalysts using artificial neural network in methanation reaction

Salmiah Jamal Mat Rosid,Azman Azid,Aisyah Fathiah Ahmad,Nursyamimi Zulkurnain,Susilawati Toemen,Wan Azelee Wan Abu Bakar,Ahmad Zamani Ab Halim,Wan Nur Aini Wan Mokhtar,Sarina Mat Rosid 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.1

Developed countries are increasing their demand for natural gas as it is an industrial requirement for fuel transportation. Most of modern society relies heavily on vehicles. However, the presence of CO₂ gas has led to the categorization of sour natural gas which reduces the quality and price of natural gas. Therefore, the catalytic methanation technique was applied to convert carbon dioxide (CO₂) to methane (CH₄) gas and reduce the emissions of CO₂ within the environment. In this study, samarium oxide supported on alumina doped with ruthenium and manganese was synthesized via wet impregnation. X-ray diffraction (XRD) analysis revealed samarium oxide, Sm₂O₃ and manganese oxide, MnO₂ as an active species. The reduction temperature for active species was at a low reaction temperature, 268.2℃ with medium basicity site as in Temperature Programme Reduction (TPR) and Temperature Programme Desorption (TPD) analyses. Field Emission Scanning Electron Microscopy (FESEM) analysis showed an agglomeration of particle size. The characterised potential catalyst of Ru/Mn/Sm (5:35:60)/Al₂O₃ (RMS 5:35:60) calcined at 1,000℃ revealed 100% conversion of CO₂ with 68.87% CH₄ formation at the reaction temperature of 400℃. These results were verified by artificial neural network (ANN) with validation R² of 0.99 indicating all modelling data are acceptable.

Development of microporous substrates of polyamide thin film composite membranes for pressure-driven and osmotically-driven membrane processes: A review

Woei Jye Lau,Gwo-Sung Lai,Jian-xin Li,Stephen Gray,Yunxia Hu,Nurasyikin Misdan,PEI SEAN GOH,Takeshi Matsuura,Ihsan Wan Azelee,Ahmad Fauzi Ismail 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-

Polyamide thinfilm composite (TFC) membranes are state-of-the-art membranes with superiorpermeability and selectivity, and are widely used in various membrane-based processes for desalination,wastewater treatment and other separation applications. Over the past 15 years, there has been growinginterest among membrane scientists to study the role of the polymeric substrates and perform in-depthanalyses on how changes in the substrate physicochemical properties could affect polyamide layer structureand thus membrane performance. Recent advancements in new polymeric materials development andnanomaterial synthesis have led to opportunities for new generation substrate development. Consideringthe importance of TFC membranes for industrial separation process, this review will give a state-of-the-artaccount of the subject matter by emphasizing substrates made by different techniques and variousmaterials. More specifically, the article will review the roles of the developed substrates on thephysiochemical properties of polyamide selective layer and further their influences on TFC membraneperformance for both pressure-driven (nanofiltration/reverse osmosis) and osmotically-driven (forwardosmosis/pressure retarded osmosis) processes, aiming to stimulate progress in thefield. A framework forbetter understanding the substrate development to fulfill the industrial requirements of TFC membraneapplication will also be presented in this review before ending with future perspectives.