Cu-SSZ-13分子筛的表面改性及其MTO反应性能  

Surface modification of Cu-SSZ-13 molecular sieve and its MTO reaction performance

作　　者：崔通通 王琪 王晓龙[2] 季生福[1] Cui Tongtong;Wang Qi;Wang Xiaolong;Ji Shengfu(State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China;China Huaneng Clean Energy Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]北京化工大学,化工资源有效利用国家重点实验室,北京100029 [2]中国华能集团清洁能源技术研究院有限公司,北京102209

出　　处：《工业催化》2019年第8期65-73,共9页Industrial Catalysis

基　　金：中国华能集团有限公司科技项目(TY-18-HJK07)

摘　　要：以廉价Cu-TEPA为模板剂合成Cu-SSZ-13分子筛,分别采用氯化铵和稀硝酸溶液对Cu-SSZ-13分子筛进行改性,制得几种甲醇制烯烃(MTO)催化剂。采用X射线衍射、X射线荧光分析、电感等离子体耦合质谱、87 K氩吸附、NH 3程序升温脱附和H 2程序升温还原等对催化剂结构进行表征,在微型固定床反应器中评价其MTO反应性能。结果表明,采用氯化铵溶液和稀硝酸溶液交换结合会降低催化剂中CuO及方沸石杂晶含量;使Cu-SSZ-13分子筛同时降低Na及Cu元素含量,获得更大的比表面积和适宜的酸强度及酸量,在MTO反应中有更长的催化寿命和更高的低碳烯烃选择性;Cu-SSZ-13分子筛的改性方式、比表面积、表面酸量、表面Cu的分布状态与催化性能密切相关。Cu-SSZ-13 molecular sieve was synthesized with inexpensive template Cu-TEPA and modified with ammonium chloride and dilute nitric acid solution respectively to get catalysts for methanol-to-olefin(MTO).The samples were characterized by X-ray diffraction,X-ray fluorescence analysis,inductively coupled plasma mass spectrometry,Ar adsorption at 87 K,NH 3 temperature programmed desorption and H 2 temperature programmed reduction.The MTO performance of the catalyst was evaluated in a micro fixed bed reactor.Results showed that content of CuO and anatase in the catalyst,and content of Na and Cu in the Cu-SSZ-13 catalyst were reduced after exchange ammonium chloride and dilute nitric acid.A larger specific surface area,suitable acid strength and acidity were achieved through the modification,resulting in longer catalytic lifetime and higher selectivity of light olefins.The MTO performance of Cu-SSZ-13 is related to the modification methods and consequent improvement of surface area and distribution of surface copper and acidity.

关 键 词：催化化学 Cu-SSZ-13 表面改性 MTO 离子交换 

分 类 号：TQ424.25[化学工程] TQ221.2