多级结构SAPO-34分子筛的制备及其催化反应性能  

Synthesis of hierarchical SAPO-34 molecular sieve and its catalytic performance

作　　者：杨帆 韩磊 黄传峰 张轩 杨天华 姬彭军 ANG Fan;HAN Lei;HUANG Chuan-feng;ZHANG Xuan;YANG Tian-hua;JI Peng-jun(Hydrocarbon High-efficiency Utilization Technology Research Center,Shaanxi YanchangPetroleum(Group) Corp.,Ltd.,Xi’an710075,China)

机构地区：[1]陕西延长石油碳氢高效利用技术研究中心

出　　处：《天然气化工—C1化学与化工》2019年第3期17-21,共5页Natural Gas Chemical Industry

基　　金：国家重大专项资金资助项目(2018YFB0604600)

摘　　要：以干凝胶法为基础,通过改变凝胶脱水方式制备了纳米颗粒堆积的多级结构SAPO-34分子筛,采用XRD、SEM、物理吸附仪、O2-DTA以及激光粒度仪等对其进行表征,并开展MTO催化反应性能研究。结果表明,多级结构的SAPO-34分子筛颗粒尺寸较大,由片状结构堆叠而成,片状结构则由80~150nm之间小颗粒聚集而组成,总比表面积和介孔孔容分别为702m^2/g和0.44mL/g,介孔平均孔径达到19.5nm;与水热合成法以及常规干凝胶法制备的SAPO-34分子筛相比,含多级结构的SAPO-34分子筛具有更好的扩散性能,在其催化MTO反应进行至200min后,甲醇转化率仍可达到96.8%,双烯烃(乙烯+丙烯)选择性达到83.48%,表现出较好的抗积炭能力和反应性能。Based on the dry gel conversion method,the hierarchical SAPO-34 molecular sieve of nanopartical aggregates was successfully synthesized by changing the way of gel dehydration.The molecular sieve samples were characterized by XRD,SEM,N2 adsorption-desorption,O2-DTA and laser particle size analyzer,and their catalytic performances inmethanol-to-olefins (MTO) reaction were investigated.The results showed that the hierarchical SAPO-34 molecular sieve had a larger particle size and was stacked from flaky structures which composed of small particles between 80-150nm.The total surface area,mesopore volume and average pore size reached to 702m^2/g,0.44 mL/g and 19.5nm,respectively.Compared with the samples synthesized by the hydrothermal method and conventional dry gel method,the hierarchical SAPO-34 molecular sieve had better diffusion properties,and exhibited better carbon resistance and catalytic performance.When the MTO reaction was carried out to 200 minutes,the conversion of methanol and the total selectivity of ethylene and propylene still reached 96.8% and 83.48%,respectively.

关 键 词：多级结构SAPO-34分子筛 MTO反应 干凝胶法 轻烯烃 

分 类 号：O643.36[理学—物理化学] TQ426[理学—化学]