The methanol-to-propylene （MTP） process is a route of methanol conversion to hydrocarbons, which is in high demand because of limited oil resources. The present paper discusses the effect of catalyst structure on th...The methanol-to-propylene （MTP） process is a route of methanol conversion to hydrocarbons, which is in high demand because of limited oil resources. The present paper discusses the effect of catalyst structure on the MTP process conditions, and the role of different zeolite factors, such as acidity, crystal size, mesoporosity, and topology, on the activity and selectivity of the MTP reaction.展开更多
Fresh ZSM-5 zeolite catalysts were pretreated at 460 ℃and 500 ℃with various cumulative amount of water feed(CAWF) in a fixed bed reactor. The catalytic process was carried out under the following conditions: a tempe...Fresh ZSM-5 zeolite catalysts were pretreated at 460 ℃and 500 ℃with various cumulative amount of water feed(CAWF) in a fixed bed reactor. The catalytic process was carried out under the following conditions: a temperature of 480 ℃; a methanol WHSV of 3 h-1; a methanol partial pressure of 30 k Pa; and a time on stream of 12 h, 24 h and 48 h, respectively. The BET parameters of catalysts and diffusion coefficients of toluene showed that there were two types of mesopores generated under different hydrothermal conditions. Mild temperature and moderate CAWF conditions led to external open mesopores which could be entered from the external surface of the zeolite, while a high temperature or a high CAWF condition resulted in the generation of macropores or internal isolated mesopores, which were occluded in the microporous matrix. The TGA results showed that catalyst with external open mesopores had good ability to resist coke accumulation and good performance on propylene selectivity, while the internal isolated mesopores did no contribute to the increased diffusivity of reactants and products.展开更多
The first in China pilot tests of fixed-bed methanol-topropylene unit were successfully implemented at the Yangzi Petrochemical Company(YPC).It is told that this technology has opened up a new process for production o...The first in China pilot tests of fixed-bed methanol-topropylene unit were successfully implemented at the Yangzi Petrochemical Company(YPC).It is told that this technology has opened up a new process for production of propylene through coal gasification,and China has possessed both the fluidized-bed methanolto-propylene process(F-MTP)and the展开更多
为了满足卫星测试软件平台化和面向多型号的需求,提高卫星测试软件的灵活性和可扩展性,提出了一种基于插件的主测试处理机MTP(Master Test Processor)通用框架,介绍了该框架的结构及提供的各种服务,定义了插件的标准接口,提供了插件和MT...为了满足卫星测试软件平台化和面向多型号的需求,提高卫星测试软件的灵活性和可扩展性,提出了一种基于插件的主测试处理机MTP(Master Test Processor)通用框架,介绍了该框架的结构及提供的各种服务,定义了插件的标准接口,提供了插件和MTP运行时(MTP Runtime)之间交互的方法。实践证明,基于此框架开发的MTP测试软件可用于多种型号卫星的测试,缩短了软件开发周期,极大地提高了卫星地面综合测试系统的测试能力。展开更多
文摘The methanol-to-propylene （MTP） process is a route of methanol conversion to hydrocarbons, which is in high demand because of limited oil resources. The present paper discusses the effect of catalyst structure on the MTP process conditions, and the role of different zeolite factors, such as acidity, crystal size, mesoporosity, and topology, on the activity and selectivity of the MTP reaction.
基金supported by the National Natural Science Foundation of China(Grant 21176208&61590925)the National High-Tech R&D Program of China(Grant 2012AA030304)+1 种基金the International S&T Cooperation Projects of China(2015DFA40660)the Fundamental Research Funds for the Central Universities(Grant2015QNA4033)
文摘Fresh ZSM-5 zeolite catalysts were pretreated at 460 ℃and 500 ℃with various cumulative amount of water feed(CAWF) in a fixed bed reactor. The catalytic process was carried out under the following conditions: a temperature of 480 ℃; a methanol WHSV of 3 h-1; a methanol partial pressure of 30 k Pa; and a time on stream of 12 h, 24 h and 48 h, respectively. The BET parameters of catalysts and diffusion coefficients of toluene showed that there were two types of mesopores generated under different hydrothermal conditions. Mild temperature and moderate CAWF conditions led to external open mesopores which could be entered from the external surface of the zeolite, while a high temperature or a high CAWF condition resulted in the generation of macropores or internal isolated mesopores, which were occluded in the microporous matrix. The TGA results showed that catalyst with external open mesopores had good ability to resist coke accumulation and good performance on propylene selectivity, while the internal isolated mesopores did no contribute to the increased diffusivity of reactants and products.
文摘The first in China pilot tests of fixed-bed methanol-topropylene unit were successfully implemented at the Yangzi Petrochemical Company(YPC).It is told that this technology has opened up a new process for production of propylene through coal gasification,and China has possessed both the fluidized-bed methanolto-propylene process(F-MTP)and the
文摘为了满足卫星测试软件平台化和面向多型号的需求,提高卫星测试软件的灵活性和可扩展性,提出了一种基于插件的主测试处理机MTP(Master Test Processor)通用框架,介绍了该框架的结构及提供的各种服务,定义了插件的标准接口,提供了插件和MTP运行时(MTP Runtime)之间交互的方法。实践证明,基于此框架开发的MTP测试软件可用于多种型号卫星的测试,缩短了软件开发周期,极大地提高了卫星地面综合测试系统的测试能力。
基金The Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges under Beijing Municipality(No.IDHT20150503)National Natural Science Foundation of China(No.31071817)+1 种基金Science and Technology Project of Beijing Municipal Education Commission(No.PM2014014207)Building Project of Beijing Laboratory of Urban and Rural Ecological Environment(No.PXM2015-014207-000014)~~
