SAPO-34和MeAPSO-34分子筛的合成及催化性能  

Synthesis and catalytic performance of SAPO-34 and MeAPSO-34 zeolites

作　　者：王红霞[1] 李建伟[1] 李英霞[1] 陈标华[1] 

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

出　　处：《北京化工大学学报（自然科学版）》2010年第6期50-54,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家杰出青年科学基金(20625621)

摘　　要：采用水热合成法制备了具有CHA骨架结构的SAPO-34和MeAPSO-34(Me=Ni、Zn、Fe、Cu和Ni-Zn)分子筛。以甲醇裂解制取低碳烯烃(MTO)为模型反应,采用固定床反应装置,对所制备的分子筛进行了催化性能评价。结果表明,所制备的MeAPSO-34分子筛具有比SAPO-34分子筛更高的乙烯选择性和乙烯与丙烯总选择性,且Ni-Zn双金属改性比单金属改性更有利于乙烯与丙烯总选择性的提高,但金属离子的添加会导致丙烯选择性的降低。与SAPO-34相比,单金属Ni的加入可使乙烯的选择性增加7.7%(由SAPO-34的40.7%增加至NiAPSO-34的48.4%),乙烯与丙烯总选择性增加2.5%;而双金属Ni-Zn的加入可使乙烯的选择性增加6.5%,乙烯与丙烯总选择性增加3.2%。SAPO-34 and MeAPSO-34 （Me=Ni,Zn,Fe,Cu or Ni-Zn） zeolites have been synthesized by the hydrothermal method. The catalytic performance of these zeolites was experimentally evaluated taking methanol to olefins （MTO） as a model reaction in a fixed-bed reactor. The results showed that the MeAPSO-34 （Me=Ni,Zn,Fe,or Ni-Zn） zeolites prepared by adding metal ions during the synthesis of SAPO-34 had a higher selectivity for ethylene and higher total selectivity for ethylene and propylene than SAPO-34 zeolite. The total selectivity for ethylene and propylene was higher for Ni-ZnAPSO-34 than for other MeAPSO-34 （Me=Ni,Zn,Fe,Cu） and it was noteworthy that adding metal ions led to a decrease in the propylene selectivity. The NiAPSO-34 gave an increase in ethylene selectivity of 7.7% （from 40.7% over SAPO-34 to 48.4% over NiAPSO-34） and the total selectivity for ethylene and propylene increased by 2.5%; the Ni-ZnAPSO-34 gave an increase of ethylene selectivity of 6.5% and an increase in total selectivity for ethylene and propylene of 3.2%.

关 键 词：SAPO-34 MeAPSO-34 MTO 分子筛 

分 类 号：TQ426.61[化学工程]