乙醇制丙烯Zn/Hβ催化剂的积碳历程  

Deactivation process on Zn/Hβ catalysts for ethanol to propylene

作　　者：屈文婷[1] 吴洋 李霁阳[1] 许磊[1] 王青[1] 张臻[1] QU Wen-ting;WU Yang;LI Ji-yang;XU Lei;WANG Qing;ZHANG Zhen(Chemical Engineering Institute,Shaanxi Research Design 710054,Shaanxi Province,China;COF-151 Project Institute of Petroleum and Chemical Industry,Xi＇an Department,Sinochem Modem Environmental Protection Chemicals（Xi＇an）Co.,Ltd.,Xi＇ an 710054,Shaanxi Province,China)

机构地区：[1]陕西省石油化工研究设计院化学工程所,陕西西安710054 [2]中化近代环保化工(西安)有限公司COF-151项目部,陕西西安710201

出　　处：《化学工程》2018年第2期47-51,共5页Chemical Engineering(China)

摘　　要：在固定床反应器上研究了乙醇制丙烯反应中16%Zn/Hβ催化剂的积碳行为,采用X射线衍射(XRD)、氧程序升温氧化(TPO)、氨程序升温脱附(NH_3-TPD)、N_2等温吸附-脱附技术(BET)对反应前后催化剂的表面积碳进行了研究。结果表明,在乙醇制丙烯反应中,16%Zn/Hβ分子筛上的积碳物种主要是高温石墨型碳和低温无定型碳;16%Zn/Hβ催化剂的强酸和中强酸中心是积碳反应的活性中心,积碳优先在催化剂的微孔生成并堵塞微孔孔道,引起催化剂的外表面积和孔径变化,使得催化剂的反应活性中心减少,最终导致催化剂活性降低。Coke deposition on 16% Zn/Hβ catalysts for ethanol to propylene in fixed bed reactor was studied. The physicochemical properties of these catalysts were characterized by powder X-ray diffraction（ XRD）,temperatureprogrammed oxidation（ TPO）,programmed desorption of ammonia（ NH_3-TPD） and N_2 isotherm adsorptiondesorption（ BET）. Based on the obtained results,the influences of coke deposition on these catalysts were discussed. The main results show thats： the coke on 16% Zn/Hβ catalysts might be consisted of aromatic hydrocarbon and aliphatic hydrocarbon; the strong acid sites of 16% Zn/Hβ catalysts are responsible for the production of coke; coke mainly deposite on the active center of Hβ catalyst,changing the external surface and mouth of the catalyst,which leads to the catalytic deactivation.

关 键 词：积碳行为 Zn/Hβ催化剂 催化剂性质 乙醇制丙烯 

分 类 号：O643.36[理学—物理化学]