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Skeletal Isomerization of 1-Hexene over mcm-22 zeolite Catalyst

China Petroleum Processing & Petrochemical Technology 2012年第4期14卷 24-27页

作者： Song Yi Shang Liyan Zhai Yuchun School of Material&Metallurgy Northeastern University School of Environmental and Biological Engineering Liaoning Shihua University

The performance of mcm-22 zeolite for catalytic isomerization of 1-hexene has been studied. At a n(H2)/n(1-hexene) ratio of 8, the influence of steam treatment temperature, reaction temperature and reaction pressure on the performance of mcm-22 zeolite for catalytic skeletal isomerization of 1-hexene was examined. The experimental results showed that at a steam treatment temperature of 500℃, a reaction temperature of 270℃, a space velocity of 1.0 h-1 and a reaction pressure of 0.2 MPa, the mcm-22 zeolite exhibited excellent performance for catalytic skeletal isomerization of 1-hexene with the i-hexene yield reaching 66.15%. Compared with other commonly used molecular sieve catalysts, the mcm-22 zeolite catalyst exhibited better catalytic performance for skeletal isomerization of 1-hexene.

关键词： mcm-22 zeolite 1-hexene skeleton isomerization

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Advances in development and industrial applications of ethylbenzene processes

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Chinese Journal of Catalysis 2016年第1期37卷 16-26页

作者：杨为民王振东孙洪敏张斌中国石油化工股份有限公司上海石油化工研究院上海201208

The benzene alkylation process for the production of ethylbenzene has undergone significant improvements during recent *** environmentally benign zeolite-catalyzed ethylbenzene processes,including ZSM-5-zeolite-based vapor-phase ethylbenzene processes and Y-,β-,and mcm-22-zeolite-based liquid-phase processes,have been developed and *** ethylene,ethanol,and dilute ethylene have been used as ethylation ***,the development and industrial application of alkylation catalysts and benzene ethylation techniques are summarized,and some other promising innovations are *** advances in benzene alkylation over hierarchical zeolites with improved access to active sites and molecular transport are also *** with short diffusion lengths are promising candidates as better alkylation *** key point is how to obtain such materials easily and *** structure-activity relationships of commercial zeolites in these processes are ***-phase processes catalyzed by β and mcm-22 are more profitable than vapor-phase processes catalyzed by ZSM-5.

关键词： Ethylbenzene Alkylation Transalkylation ZSM-5 zeolite mcm-22 zeolite Beta zeolite Y zeolite

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Synthesis of ITQ-2 zeolites and Catalytic Performance in n-Dodecane Cracking

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Chinese Journal of Chemical Engineering 2014年第8期22卷 869-874页

作者：郝江鸽王莹刘国柱张靖雯李国柱马雪松 Key Laboratory of Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin University Science and Technology on Scramjet Laboratory

ITQ-2 zeolites were prepared by sequential alkali-swelling and ultrasonic-delamination of precursor mcm-22 and characterized by X-ray powder diffraction, scanning electron microscopy, nitrogen adsorption-desorption, ammonia temperature-programmed desorption and in-situ Fourier-transform infrared spectroscopy. The delamination induced a change in the morphology of ITQ-2 zeolites from aggregated thin platelets to scattered platelets, together with a significant increase in external specific surface area, which reached a plateau at the ultrasonic treatment time of 3 h. The catalytic cracking of n-dodecane over ITQ-2 zeolites was evaluated with ITQ-2 coated on the inside wall of a tubular reactor at 550 ℃ and 4 MPa. The sample obtained by ultrasonic treatment of 3 h （ITQ-2-3） gave the highest initial conversion of n-dodecane, whereas those of 5 h and I h gave the conversion even lower than mcm-22, which was in agreement with the trend of the ratio of strong Lewis acid to the total acid amount. Although the amount of cokes deposited on ITQ-2-3 was larger than that on mcm-22, the former deactivated slowly, suggesting that a large external specific surface area benefits the stability of zeolite coatings,

关键词： mcm-22 zeolite ITQ-2 zeolite Swelling Delamination Catalytic cracking n-Dodecane

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