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用水热法合成了SAPO-34分子筛。在Si-P-Al三组份相图上给出了生成SAPO-34的纯相区域。在H_2O和TEAOH为指定浓度的情况下,当P/Al>1时,产物主要为致密相AlPO_4;当P/Al≤1时,合成了一系列不同组成的SAPO-34。P-Al体系中不能产生SAPO-34结构的沸石,但加入ZnO或MgO合成出了ZAPO-34和MAPO-34。HSAPO-34作为甲醇转化制低碳烯烃的催化剂,C_2=-C_4~(?)和C_2~(?)的选择性分别为89％和57—59％,C_2=/C_3=为2.24—2.31,远优于HSAPO-5和HZSM-5。
SAPO-34 zeolite was synthesized by hydrothermal method. A pure phase region to generate SAPO-34 is given on the Si-P-Al three-component phase diagram. When the concentration of H_2O and TEAOH is the specified concentration, the product is mainly the dense phase AlPO_4 when P / Al> 1, and a series of SAPO-34 with different composition is synthesized when P / Al≤1. P-Al system can not produce SAPO-34 zeolite structure, but with the addition of ZnO or MgO synthesized ZAPO-34 and MAPO-34. As a catalyst for the conversion of methanol to light olefins, HSAPO-34 has selectivity of 89% and 57-59% for C 2 -C 4 -C 4 and C 2 -C 2, and C 2 = / C 3 = 2.24-2.31, Much better than HSAPO-5 and HZSM-5.