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Aromatization of methanol over co-impregnated La/Zn/HZSM-5 zeolite catalyst was studied.The selectivity of aromatics and BTX(benzene,toluene,and xylene)reached 64.0%and 56.6%,respectively,using La/Zn/HZSM-5 at 437°C,0.1 MPa and methanol WHSV(weight hourly space velocity)=0.8 h-1.Catalytic results showed that the La species was a very good promoter,increased selectivity of aromatics,and prolonged the catalyst lifetime on stream.The effects of the SiO2/Al2O3 ratio in zeolite,Zn and La loading,WHSV,reaction temperature, water content in the feed and H2 pretreatment of catalysts on the catalytic performance were studied in detail. Characterizations of the catalysts by thermogravimetric analysis(TGA),NH3-TPD(temperature programmed desorption),SEM(scanning electron micrograph),N2 adsorption-desorption,XRD(X-ray diffraction)and XRF (X-ray fluorescence),were carried out to understand the structure and discuss the aromatization performance of La/Zn/HZSM-5 zeolite catalyst. 相似文献
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汽车生产流水线一个重要的特征是多品种的混线生产,针对这种流水线的生产监控系统(PMC:Production Monitoring and Control System)需要完成不同型号产品的批次管理、线上设备的监控、产品加工数据的采集和分析等功能。本文结合在一个发动机装配线上的实施实例,介绍了一种生产监控系统的设计和实施方案。该实施方案以可编程控制器结合上层管理软件,实现对多品种生产投产管理、生产流水线监控、产品制造数据管理等多个功能。对应的实施系统已经在某汽车制造厂成功运行。 相似文献
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1前言目前日用陶瓷厂使用的碳化硅匣钵一般采用压制成型。大口径的匣钵需用高吨位的液压机压制。担负着供应日用瓷厂碳化硅匣钵任务的国光瓷业集团公司特种陶瓷厂,现用YT32-315A液压成型机压制匣钵。如用它压制大口径的碳化硅匣钵,压力偏小而影响匣钵的质量,不能适应生产发展的需要,若添置大吨位的液压成型机需要投入大量资金。为了节省投资,决定将厂里闲置的YT32-630型液压机来压制大口径的碳化硅匣钵。但该机与现用的YT32-315A型液压成型机的性能不同,现用压机工作时,上、下模对被压物料同时加压。而Y… 相似文献
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