小晶粒SAPO-34分子筛研究进展

Research advances in small crystal SAPO-34 molecular sieves

SAPO-34分子筛被用作甲醇反应制低碳烯烃(乙烯、丙烯)(MTO)工艺的催化剂。然而,传统的SAPO-34分子筛催化剂容易失活,单程寿命较短。研究表明,降低SAPO-34分子筛粒径,可以有效地提高催化剂比表面积,减弱扩散的限制,增加催化剂的活性中心和抗积炭能力、加速反应热去除以及延长催化剂单程寿命。本文介绍了小晶粒SAPO-34分子筛具有的特性和制备小晶粒SAPO-34分子筛技术的研究进展,并提出研究开发建议。

SAPO-34 molecular sieves were used as the catalyst of the methanol to olefins （MTO） process, however, the conventional SAPO-34 catalysts were easy to loss activity and had a short single cycle life. It was found that reducing the crystalline size of SAPO-34 could improve the specific surface area, weaken the diffusion limit, increase the active sites, enhance the anti-carbon deposition ability, accelerate removing the heat of reaction and prolong the single cycle life. The characteristics and research advances of the small crystal SAPO-34 molecular sieves were presented, and some suggestions were given for developing these catalysts.