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Jermy, B.R.,Kim, S.Y.,Kim, D.K.,Park, D.W. Korean Society of Industrial and Engineering Chemi 2011 Journal of industrial and engineering chemistry Vol.17 No.1
Highly ordered three-dimensional V-SBA-16 materials were prepared at mild acidic condition by tuning the key parameters for metal substitution such as molar ratio of silica to 1-butanol (TEOS/BuOH), water to hydrochloric acid (H<SUB>2</SUB>O/HCl ratio) and hydrothermal aging time in the initial gel containing 0.0035 F127/0.01V/0.91-2.00 TEOS/2.08-0.76 BuOH/0.70-1.16 HCl/118.6-120.1 H<SUB>2</SUB>O. The extent of mesopore structural ordering was confirmed by small-angle X-ray scattering and nitrogen adsorption isotherms. The presence of incorporated vanadium in a highly dispersed tetrahedral state was confirmed by electron spin resonance (ESR) and Drs-UV spectroscopy. The NH<SUB>3</SUB>-TPD profile showed that the materials tend to posses medium-acidic V-OH sites; strong-acidic sites increased with decreasing Si/V ratios. TEM analysis shows that the cubic phase was stable up to 3.6wt.% vanadium loading. The activity of V-SBA-16 was tested for the selective oxidation of ethylbenzene to acetophenone by studying the effect of temperatures, time on stream, and the mole ratio of ethylbenzene to TBHP.
Balasamy Rabindran Jermy,Sang-Yun Kim,Kanattukara Vijayan Bineesh,셀바라지,박대원 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
Three dimensional (3-D) cubic KIT-6 with directly incorporated vanadium was hydrothermally synthesized by using Pluronic P123 and n-butanol as the structure-directing mixture, tetraethyl orthosilicate (TEOS) as the silica source and NH4VO3 as the vanadium source. The molar composition was varied in the range of 0.017 P123/0.08- 2.4 V/1.0-2.0 TEOS/1.31-1.70 BuOH/1.83-3.00 HCl/195 H2O. The orderness of mesopore structure was estimated by X-ray diffraction, N2 adsorption, and TEM analysis. The effects of the amount of HCl, TEOS and BuOH on the structure of KIT-6 were discussed. The time and temperature for the synthesis of KIT-6 were also optimized. The amount of vanadium content influenced the framework structure and crystallinity of the Ia3d phase significantly.
Balasamy Rabindran Jermy,Sang-Yun Kim,Kanattukara Vijayan Bineesh,셀바라지,Seung-Kug Song,Jong-Woo Ryu,박대원 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
The direct incorporation of vanadium into the three-dimensional (3-D) cubic Ia3d mesostructure designated as V-KIT-6 was prepared, and the material obtained therein showed a very high specific surface area of ~1,000㎡/g with tunable pore diameters in a narrow distribution of sizes, ~5.7 to 6.0 nm. The coordination and nature of the V sites in V-KIT-6 were characterized by 51V-spin-echo NMR analysis. It shows that after calcination, the V4+ species are totally oxidized to the V5+ state with 4- and 6-coordinated V-O environments in a highly dispersed state with much less crystalline V2O5 formation. The calcined V-KIT-6 materials showed excellent catalytic activity in the direct oxidation of styrene using tert-butyl hydroperoxide (TBHP) as an oxidant.
B. Rabindran Jermy,박대원,S.Y. Kim,D.K. Kim 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.1
Highly ordered three-dimensional V-SBA-16 materials were prepared at mild acidic condition by tuning the key parameters for metal substitution such as molar ratio of silica to 1-butanol (TEOS/BuOH), water to hydrochloric acid (H2O/HCl ratio) and hydrothermal aging time in the initial gel containing 0.0035F127/0.01 V/0.91–2.00 TEOS/2.08–0.76 BuOH/0.70–1.16 HCl/118.6–120.1 H2O. The extent of mesopore structural ordering was confirmed by small-angle X-ray scattering and nitrogen adsorption isotherms. The presence of incorporated vanadium in a highly dispersed tetrahedral state was confirmed by electron spin resonance (ESR) and Drs-UV spectroscopy. The NH3-TPD profile showed that the materials tend to posses medium-acidic V–OH sites; strong-acidic sites increased with decreasing Si/V ratios. TEM analysis shows that the cubic phase was stable up to 3.6 wt.% vanadium loading. The activity of V-SBA-16was tested for the selective oxidation of ethylbenzene to acetophenone by studying the effect of temperatures, time on stream, and the mole ratio of ethylbenzene to TBHP.
G. Tanimu,B.R. Jermy,S. Asaoka,S. Al-Khattaf 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
The effect of metal oxide species in (Ni, Fe and/or Co) oxide-Bi2O3 over gamma-alumina support wasinvestigated for n-butane oxidative dehydrogenation. Partial substitution of Ni up to 50% by Fe improvedbutadiene selectivity while same substitution with Co increased n-butane conversion. The ternary Ni-Fe-Co system (10 wt% Ni–5 wt% Fe–5 wt% Co–30 wt% Bi-O/gamma-Al2O3) showed the highest butadieneselectivity of 46.3% at n-butane conversion of 30%. The acid-base sites preferably adjusted by ternarymain metal combination in hierarchical cohabitation of metal (Ni, Fe and Co) oxide, Bi2O3 and gamma-Al2O3 cooperate to accelerate butadiene selectivity at both 1st and 2nd step dehydrogenations due to anincreased H2 abstraction and 1-butene intermediate adsorption.
Kanattukara Vijayan Bineesh,,Balasamy Rabindran Jermy,Sang-Yun Kim,박대원 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
A series of vanadia-doped titania pillared clay (V/Ti-PILC) with various amounts of vanadia were prepared and their performance for the selective catalytic oxidation of H2S was investigated in this study. V/Ti-PILCs were characterized using X-ray diffraction (XRD), BET apparatus, and X-ray photoelectron spectroscopy (XPS). V/Ti-PILCs showed better catalytic performance than as such Ti-PILC at temperatures ranging from 220 to 300 ℃ without any considerable SO2 emission. The H2S conversion over V/Ti-PILC increased with increasing vanadia content up to 5 wt.%. This superior catalytic performance might be related to the uniform dispersion of vanadia in the formof monomeric and polymeric species. However, it decreased at 10 wt.% vanadia loading due to the decrease of surface area and to the formation of crystalline V2O5 phase. The presence ofwater vapor in the reactantmixture resulted in the decrease of the H2S conversion. 2009 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Bineesh, K.V.,Kim, S.Y.,Jermy, B.R.,Park, D.W. Korean Society of Industrial and Engineering Chemi 2009 Journal of industrial and engineering chemistry Vol.15 No.2
A series of vanadia-doped titania pillared clay (V/Ti-PILC) with various amounts of vanadia were prepared and their performance for the selective catalytic oxidation of H<SUB>2</SUB>S was investigated in this study. V/Ti-PILCs were characterized using X-ray diffraction (XRD), BET apparatus, and X-ray photoelectron spectroscopy (XPS). V/Ti-PILCs showed better catalytic performance than as such Ti-PILC at temperatures ranging from 220 to 300<SUP>o</SUP>C without any considerable SO<SUB>2</SUB> emission. The H<SUB>2</SUB>S conversion over V/Ti-PILC increased with increasing vanadia content up to 5wt.%. This superior catalytic performance might be related to the uniform dispersion of vanadia in the form of monomeric and polymeric species. However, it decreased at 10wt.% vanadia loading due to the decrease of surface area and to the formation of crystalline V<SUB>2</SUB>O<SUB>5</SUB> phase. The presence of water vapor in the reactant mixture resulted in the decrease of the H<SUB>2</SUB>S conversion.
Syed A. Ali,Faisal M. Almulla,B. Rabindran Jermy,Abdullah M. Aitani,Raed H. Abudawoud,Mohammed AlAmer,Ziyauddin S. Qureshi,Thamer Mohammad,Hassan S. Alasiri 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Hierarchical composites of MCM-41 on zeolite Beta were synthesized by in-situ hydrothermal technique,characterized and their catalytic performance for converting heavy reformate into valuable xylenes wasevaluated. Systematic optimization of the hierarchical pore generation was carried out by varying thestrength of the alkaline solution (0.10 0.45 M NaOH) during disintegration of zeolite Beta. Thenanocomposites obtained were extruded with alumina binder and impregnated with 4.0 wt% Mo. Thecharacterization results indicate the transition of mesophase occurs from distinct disordered phase toordered/disordered and then to ordered mesophase with increasing alkaline concentration. The xyleneyield over the hierarchical composite zeolite was 1.4 times more than the parent zeolite Beta. Incorporation of a well-dispersed mild hydrogenation function (4 wt.% Mo) was advantageous inimproving the xylene yield and selectivity. The formulation prepared with moderately alkaline (0.2 MNaOH) solution exhibited optimum bimodal pore structure and improved dealkylation and transalkylationconversion resulting in a xylene yield of 33.0 wt.% and 1.7 times enhancement in xyleneselectivity over parent zeolite Beta. A 30 h stability test showed steady performance and xylene yields. Hence, a potential application of hierarchical zeolite Beta and MCM-41 composite catalysts for theconversion of heavy aromatics to produce xylenes has been successfully demonstrated.