第二种金属对MCuSAPO-34分子筛低温水热稳定性的影响  

Effect of the second metal on low temperature hydrothermal stability of MCuSAPO-34 molecular sieve

作　　者：张强[1] 于梦云 周洲 田梦阳 Zhang Qiang;Yu Mengyun;Zhou Zhou;Tian Mengyang(State Key Laboratory of Heavy Oil Processing,Department of Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,山东青岛266580

出　　处：《工业催化》2021年第11期24-29,共6页Industrial Catalysis

基　　金：国家自然科学基金项目(21406270)。

摘　　要：CuSAPO-34分子筛在氨气选择性催化还原氮氧化物(NH_(3)-SCR)反应中具有高的脱硝活性和高温稳定性,但其低温水热稳定性欠佳。采用原位一步法制备MCuSAPO-34双金属分子筛,第二金属分别为Ce、Fe、Ni。利用XRD、BET、TPD、TPR和微反评价装置等表征催化剂的结构和活性。结果表明,与CuSAPO-34分子筛相比,双金属分子筛具有略低的结晶度和较高的比表面积,酸性变化与金属的种类密切相关。其中,双金属分子筛CeCuSAPO-34具有最高的酸性、活性铜离子的数量、脱硝活性和低温水热稳定性,150℃条件下,含水烟气脱硝率从82%提高到88%。CuSAPO-34 molecular sieve exhibits high deNOx activity and high-temperature stability in ammonia selective catalytic reduction(SCR)of nitrogen oxides,but with inferior low-temperature hydrothermal stability.MCuSAPO-34 bimetallic molecular sieve was synthesized by in-situ one-step method,using Ce,Fe and Ni as the second metals,respectively.The structure and activity of the catalysts was characterized by XRD,BET,TPD,TPR and micro-reactor.The results indicated that,compared with CuSAPO-34,bimetallic molecular sieves have slightly lower crystallinity and higher surface area;and the change in acidity is closely related to sort of the metals.CeCuSAPO-34 exhibited the highest acidity,most number of active copper ions,highest deNOx activity and highest low temperature hydrothermal stability,enhancing water-containing flue gas deNOx efficiency from 82% to 88% at 150℃.

关 键 词：催化化学 氨气选择性催化还原氮氧化物 SAPO-34分子筛 双金属分子筛 低温稳定性 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]