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制备了100%SAPO-34,30%SAPO-34和介孔-SAPO-34三种不同类型的SAPO-34分子筛催化剂,并采用氮吸附、扫描电镜、X射线衍射和红外光谱等方法对催化剂进行了表征.三种催化剂的微孔结构、比表面积和总酸量近似,但具有不同的催化剂组成和次级结构.以1-己烯裂解为模型反应考察了三种催化剂的催化活性.对于30%SAPO-34催化剂,由于添加了粘结剂,其外表面酸性和扩散性能下降,导致催化活性降低;100% SAPO-34催化剂则具有较好的催化性能;介孔SAPO-34催化剂次级结构的存在使其失活较慢,从而提高了原料的转化率.详细讨论了1-己烯催化裂解制丙烯的活性和选择性曲线,以进一步说明催化剂组成和结构的影响.
Three different types of SAPO-34 molecular sieve catalysts, SAPO-34, 30% SAPO-34 and mesoporous-SAPO-34, were prepared and characterized by means of nitrogen adsorption, SEM, XRD and FTIR The catalytic activities of the three catalysts were investigated by cracking of 1-hexene as a model reaction.For the catalytic activity of the three catalysts, the specific surface area and total acid amount of the three catalysts were similar, but with different catalyst composition and secondary structure. % SAPO-34catalyst, due to the addition of a binder, the acidity and diffusibility of the outer surface decreased, resulting in a decrease in the catalytic activity; the 100% SAPO-34catalyst had good catalytic performance; the secondary structure of the mesoporous SAPO-34catalyst , Which leads to a slower deactivation, which improves the conversion rate of raw materials.The activity and selectivity curves of 1-hexene-catalyzed pyrolysis of propylene were discussed in detail to further illustrate the influence of catalyst composition and structure.