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RISS 인기검색어
- 검색키워드
- 저자 : Khalid Alhooshani (검색결과 3 건)
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Mild hydrocracking of 1-methyl naphthalene (1-MN) over alumina modified zeolite
박주일,Syed Ahmed Ali,Khalid Alhooshani,Nor Azizi,Jin Miyawaki,김태곤,이영진,김현석,윤성호,Isao Mochida 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
The catalytic activity and life of the NiMoS supported on alumina–USY zeolite (physical mixture of alumina and USY (NMAZ), USY zeolite coated with alumina (NMACZ-2)) were compared in the hydrocracking of 1-methyl naphthalene by a single run at the several reaction temperatures between 360 and 400 8C as well as repeated runs at 360 8C. The relative activity of NMAZ is slightly higher after 1 h at all reaction temperatures, but was lower after 2 h at reaction temperatures above 380 8C. The preference of NMACZ-2 became distinct and definite by further increasing the reaction time at all reaction temperatures. Too long reaction time, particularly at higher reaction temperature, decreased the yield of (alkyl)benzenes, indicating the significant progress of the successive reactions. Thus, the highest yield of alkyl(benzenes) of about 97% was obtained over NMACZ-2 after 4 h at 380–390 8C. This was much less than the yield of about 82% obtained over NMAZ after 4 h at 370 8C. Ten repeated runs at 360 8C for 6 h resulted in marked decrease of yield over NMAZ from 73% to 64%, while the decrease in yield over NMACZ-2 was only from about 80% to 78%. The decrease of catalytic activity appears to reflect the coke formation on the USY which occurs on the naked acidic site of the substrate, which are rather isolated from the NiMoS on alumina. In contrast, alumina-coated support keeps USY underneath the alumina, which carries NiMoS and acidic sites on the same surface. The acidity of surface alumina is moderated by the underneath USY. The adequate acidity of the neighboring NiMoS and high hydrogenation activity provide a good balance resulting in an excellent catalytic activity and life of NiMoS supported on alumina-coated USY zeolite.
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Analysis and deep hydrodesulfurization reactivity of Saudi Arabian gas oils
김태곤,박주일,Syed Ahmed Ali,Khalid Alhooshani,Mohammed Al-Yami,윤성호,Isao Mochida 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Gas oils obtained from Arabian Light (AL-GO), Arabian Medium (AM-GO) and Arabian Heavy (AH-GO)crude oils were subjected to detailed analysis in terms of reactive and refractory sulfur, nitrogen, as well as aromatic species. Deep hydrodesulfurization (HDS) of these gas oils over SiO2–Al2O3-supported CoMo and NiMo catalysts was studied using autoclave reactor either in one- or two-stage operations. AL-GO was easily and deeply desulfurized to 15 ppm over CoMo/Al2O3–SiO2 (catalyst X) at 340 8C and 5 MPa (H2) for 2 h. At the same conditions, AM-GO and AH-GO could be desulfurized to 70 and 78 ppm,respectively. Two-staged HDS, by combining CoMo and NiMo catalysts, in successive steps resulted in effective deep HDS. The replacement of hydrogen atmosphere after the first-stage (1 h) enhanced the AH-GO HDS during the second-stage (1 h) to 9 ppm. However, replacing the hydrogen in the secondstage with 5% H2S in hydrogen inhibited the HDS, resulting in product sulfur content of 15 ppm. Analysis of sulfur species indicate that significant fraction of reactive and refractory sulfur species were removed during the first-stage whereas the remaining refractory sulfur species were removed during the second-stage. Kinetic analysis indicates overwhelming influence of refractive sulfur species on the overall HDS. The results from this study show that two-stage scheme with optimum catalysts in series can be applied to overcome the difficulty to achieve deep HDS of AH-GO.
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Ijaz Hussain,Umar Mustapha,Ahmed T. Al-Qathmi,Zuhair O Malaibari,Sarah Alotaibi,Samia,Khalid Alhooshani,Saheed A. Ganiyu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
Catalytic hydrogenation is one of the most innovative techniques for reducing atmospheric carbon dioxide(CO2) by converting it into beneficial products such as methanol (CH3OH). CH3OH is an alternativefuel that offers a practical, effective, and efficient solution to the energy storage problem. Despite the significantadvances in the CO2 hydrogenation process, developing an appropriate and efficient catalytic systemremains a significant obstacle and challenge. Many review papers on catalyst development for CO2hydrogenation have been published, focusing on the influence of transition, noble metal-based catalysts,and process parameter. However, present knowledge of the mutually reinforcing correlations betweencatalytic properties and CO2 hydrogenation activity has to be enhanced. It is very important to have acomprehensive understanding of the relationship between catalytic performance and physicochemicalproperties in order to create a catalytic system that is both highly efficient and economically viable forcommercialization. Therefore, the focus of this review is on the synergistic interactions between catalyticCO2 hydrogenation activity and catalytic properties such as porosity, surface area, metal-support interaction,metal dispersion, oxygen vacancies, metal particle size, reducibility, and chemical composition acidity/basicity. Furthermore, this review examined and compared the most up-to-date findings on thehydrogenation of CO2 to CH3OH using various heterogeneous catalysts. It also discussed the challengesand prospects for improving CH3OH production by CO2 hydrogenation. Researchers and environmentalistsin academia and industry who are interested in finding ways to reduce CO2 emissions will find thisoverview to be a valuable resource.
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