检索结果-南通市图书馆

Synthesis of ZSM-5/MOR Co-crystalline Zeolite without Template and the Catalytic Application Thereof

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & petrochemical technology 2009年第1期11卷 51-57页

作者： Zhang Huiming Ma Guangwei shanghai research institute of petrochemical technology SINOPEC Shanghai 201208

A ZSM-5/MOR co-crystalline zeolite was synthesized without using the template. The physico-chemical properties of the zeolite were characterized by XRD, FT-IR, SEM and TPD and then compared with the co-crystalline zeolite synthesized with a template. Analytical results indicated that they were similar in structure and composition. The influences ofpH value and Si/Al ratio on synthesis were studied. It was found that a high pH value or a low Si/AI ratio could provide better environment for mordenite （MOR） crystallization. The zeolites applied as catalysts in naphtha catalytic cracking for producing ethylene and propylene showed outstanding catalytic performance with the total yield of ethylene and propylene reaching 55 m%. The process could achieve most favorable efficiency when the catalyst contained 5 m% of MOR.

关键词： ZSM-5 mordenite co-crystalline catalytic cracking ethylene propylene

Effect of Water Vapour on the Acidity of ZSM-5 Zeolite Used for Catalytic Cracking of Naphtha to Manufacture Ethylene and Propylene

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & petrochemical technology 2008年第4期10卷 33-39页

作者： Ma Guangwei Xiao Jingxian ZhangHuining Xie Zaiku shanghai research institute of petrochemical technology SINOPEC Shanghai 201208

The change in acidity of the ZSM-5 zeolite was investigated after it was treated with water vapour, and its capability on ammonia adsorption was also studied after having adsorbed water vapour. The effect of water vapour on products distribution was studied during catalytic cracking of naphtha, the changes in the adsorption ability and catalytic performance of the ZSM-5 zeolite was investigated after the catalyst was loaded with phosphorus species. These results all indicated that water vapour could reduce the acid strength and acid density of ZSM-5 zeolite and affect the capability of ZSM-5 on adsorption of gases, therefore the activated energy contributed by the ZSM-5 zeolite to the catalytic cracking reaction would be low to prevent the feedstock from deepened catalytic cracking and coke formation.

关键词： water vapor acidity catalytic cracking ethylene propylene

Applied catalysis for sustainable development of chemical industry in China

在线全文

学校读者我要写书评

暂无评论

National Science Review 2015年第2期2卷 167-182页

作者： Zaiku Xie Zhicheng Liu Yangdong Wang Zhonghao Jin China Petroleum & Chemical Corporation sinopec shanghai research institute of petrochemical technology

Progressing green chemical technologies is signiicant to the sustainable development of chemical industry in China, as the energy and environment problems increasingly became great challenges to the whole society. he scientiic connotation of sustainable energy chemical engineering can be generalized as green carbon/hydrogen science which means optimization of carbon/hydrogen atom economics based on high eicient catalysis and low-carbon emission. his review illustrated recent advances in developing sustainable technologies for applied catalysis in chemical industry of China, including the ields of high eicient conversion of heavy oil, green petrochemical catalytic technologies, clean utilization of coal and natural gas, promoting sustainable resources and clean energy, etc. Moreover, from the view of industrial point, some important common scientiic problems were discussed and summarized, such as the relation between molecular difusion and catalyzing eiciency, homogeneous catalysis in heterogeneous catalysts,in situ or operando characterization of industrial catalysis, etc., aiming to supplying a forward roadmap to academia and/or industry.

关键词： applied catalysis catalytic eiciency green carbon/hydrogen science green petrochemical technology coal chemical technology bioma

Shape selective catalysis in methylation of toluene： Development, challenges and perspectives

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2018年第1期12卷 103-112页

作者： Jian Zhou Zhicheng Liu Yangdong Wang Dejin Kong Zaiku Xie shanghai research institute of petrochemical technology S/NOPEC Shanghai 201208 China sinopec Beijing 100027 China

Toluene methylation with methanol offers an alternative method to produce p-xylene by gathering methyl group directly from C1 chemical sources. It supplies a ＂molecular engineering＂ process to realize directional conversion of toluene/methanol molecules by selective catalysis in complicated methylation system. In this review, we introduce the synthesis method ofp-xylene, the development history of methylation catalysts and reaction mechanism, and the effect of reaction condition in para-selective technical process. If constructing p-xylene as the single target product, the major challenge to develop para-selective toluene methylation is to improve the p-xylene selectivity without, or as little as possible, losing the fraction of methanol for methylation. To reach higher yield ofp-xylene and more methanol usage in methylation, zeolite catalyst design should consider improving mass transfer and afterwards coveting external acid sites by surface modification to get short ＂micro-tunnels＂ with shape selectivity. A solid understanding of mass transfer will benefit realizing the aim of converting more methanol feedstock into para-methyl group.

关键词： shape selective catalysis methylation of toluene

Development and Application of Heat-integrated Aromatics Fractionation Process

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Petroleum Processing & petrochemical technology 2009年第2期11卷 21-26页

作者： Yang Weisheng Kong Dejin Tan Yongzhong sinopec shanghai research institute of petrochemical technology Shanghai 201208 sinopec Zhenhai Refining and Chemical Branch Company

The PRO/Ⅱ process simulation software was applied to carry out simulated calculation of the aromatics fractionation unit and the heat integrated rectification process was proposed for the aromatics fractionation section of the 1.0 Mt/a toluene disproportionation unit at the Zhenhai Refining and Chemical Company. The optimized operating parameters were obtained through the energy utilization analysis,process simulation,heat exchanger calculations and comparisons of utility consumption. The operation of commercialized unit has revealed that the design parameters of each rectification column were consistent with the operation results,and the utility consumption was about 47% lower than the traditional heat integrated process.

关键词： aromatics fractionation heat integration energy conservation

Effect of vacuum impregnation on the performance of Co/SiO_2 Fischer-Tropsch catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2011年第4期20卷 350-355页

作者： Xiaofeng Zhou Qingling Chen Yuewu Tao Huixin Weng research Center of Petroleum Processing East China University of Science and Technology Shanghai 200237 China shanghai research institute of petrochemical technology SINOPEC Shanghai 201208 China

Two silica-supported cobalt catalysts were prepared by incipient wetness impregnation under atmospheric and vacuum conditions.N2 ph- ysisorption,H2 chemisorption,XRD,SEM,TEM,XPS and H2-TPR were used to characterize the *** results showed that the impregnation methods had an effect on the size,dispersion and reducibility of cobalt *** vacuum conditions,cobalt-containing steeping liquor could penetrate into the inner pores of silica support and more bivalent cobalt oxides were formed in the Co3O4 ***,cobalt precursors were rarely inclined to agglomerate and the smaller cobalt particles were uniform on the support,which led to the higher activity of the Co/SiO2（B）catalyst than the normal one under the reaction conditions of 483- 523 K,1 - 2 MPa,gas hourly space velocity of 500–1000 h-1 and molar ratio of H2/CO=0.5 - 2.0.

关键词： Fischer-Tropsch synthesis cobalt catalysts silica vacuum impregnation

Correlation between hydrocarbon distribution and water-hydrocarbon ratio in Fischer-Tropsch synthesis

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2011年第5期20卷 525-530页

作者： Xiaofeng Zhou Qingling Chen Yuewu Yao Huixin Weng research Center of Petroleum Processing East China University of Science and Technology Shanghai 200237 China shanghai research institute of petrochemical technology SINOPEC Shanghai 201208 China

In order to shorten the evaluation cycle of cobalt catalyst before the optimized catalyst is fixed on, a mathematical method is proposed to calculate weight percentage of C5＋ hydrocarbons. Based on the carbide polymerization mechanism and the main hydrocarbons being linear alkanes and α-olefins, the correlation between hydrocarbon distribution and the molecular mass ratio of water to hydrocarbons is discussed. The result shows the ratio was within the range of 1.125-1.286 and the lower the ratio, the more gaseous hydrocarbons were obtained. Moreover, a linear equation between the weight percentage of C5＋ hydrocarbons and the weight ratio of C5＋ hydrocarbons to the total water is established. These results are validated by corresponding experiments. The weight percentage of C5＋ hydrocarbons could be immediately calculated by this linear equation without detailed gas chromatography （GC） analysis of them.

关键词： Fischer-Tropsch synthesis cobalt catalyst water-hydrocarbon weight ratio hydrocarbon distribution

Hierarchical ZSM-5 zeolite with radial mesopores:Preparation,formation mechanism and application for benzene alkylation

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2020年第2期14卷 248-257页

作者： Darui Wang Hongmin Sun Wei Liu Zhenhao Shen Weimin Yang State Key Laboratory of Green Chemical Engineering and Industrial Catalysis Shanghai Research Institute of Petrochemical TechnologySinopecShanghai 201208China

Hierarchical ZSM-5 zeolite with radial mesopores is controllably synthesized using piperidine in a NaOH *** piperidine molecules enter the zeolite micropores and protect the zeolite framework from extensive *** areas containing fewer aluminum atoms contain fewer piperidine protectant molecules and so they dissolve *** amounts of mesopores are then gradually generated in areas with more aluminum atoms and more piperidine *** this manner,radial mesopores are formed in the ZSM-5 zeolite with a maximal preservation of the micropores and active *** optimal hierarchical ZSM-5 zeolite,prepared with a molar ratio of piperidine to zeolite of 0.03,had a mesopore surface area of 136 m·g and a solid yield of 80%.The incorporation of the radial mesopores results in micropores that are interconnected which shortened the average diffusion path *** to the parent zeolite,the hierarchical ZSM-5 zeolite possesses more accessible acid sites and has a higher catalytic activity and a longer lifetime for the alkylation of benzene.

关键词： hierarchical ZSM-5 zeolite protective desilication piperidine radial mesopores benzene alkylation

Insight into the topology effect on the diffusion of ethene and propene in zeolites: A molecular dynamics simulation study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第6期22卷 914-918页

作者： Chuanming Wang Bowei Li Yangdong Wang Zaiku Xie shanghai research institute of petrochemical technology SINOPEC School of Chemistry and Molecular Engineering East China University of Science and Technology

Selectivity control is a difficult scientific and industrial challenge in methanol-to-olefins(MTO)*** has been experimentally established that the topology of zeolite catalysts influenced the distribution of *** the topology effect on reaction kinetics,the topology influences the diffusion of reactants and products in catalysts as *** this work,by using COMPASS force-field molecular dynamics method,we investigated the intracrystalline diffusion of ethene and propene in four different zeolites,CHA,MFI,BEA and FAU,at different *** self-diffusion coefficients and diffusion activation barriers were calculated.A strong restriction on the diffusion of propene in CHA was observed because the self-diffusion coefficient ratio of ethene to propene is larger than 18 and the diffusion activation barrier of propene is more than 20 kJ/mol in *** ratio decreases with the increase of temperature in the four investigated *** shape selectivity on products from diffusion perspective can provide some implications on the understanding of the selectivity difference between HSAPO-34 and HZSM-5 catalysts for the MTO conversion.

关键词： methanol-to-olefins conversion diffusion zeolites ethene propene molecular dynamics simulation