To improve the dispersion of metals and to enhance the catalytic performance of SAPO-34 molecular sieves, the template-assisted method was applied to synthesize Co, Ni and Zn modified SAPO-34 molecular sieves by using palygorskite as silicon source and tetraethylammonium hydroxide as template. The metal modified SAPO-34 molecular sieves were characterized by XRD, SEM, XPS, N₂-adsorption-desorption, NH₃-TPD, FTIR, ICP-AES and TG. The N atoms of tetraethylammonium hydroxide exhibited the different forces to three metal ions, thus the acidity of the molecular sieves was further regulated. Compared with metal modified SAPO-34 molecular sieves prepared by impregnation, metal modified SAPO-34 molecular sieves prepared by template-assisted maintained higher surface area, bigger pore volume and better dispersion of metals. The catalytic performance of metal modified SAPO-34 molecular sieves prepared by template-assisted method in the reaction of methanol-to-olefins (MTO) was investigated in the fixed bed reactor. Under the reaction conditions that the reaction temperature was 400 °C, the reaction pressure was 0.1 MPa, the feed WHSV was 2.0 h⁻¹ and the mass of catalyst was 0.5 g, Ni modified SAPO-34 molecular sieves exhibited great methanol conversion and high selectivity to light olefins. The selectivity of light olefins reached 95.7%.

为改善金属的分散性，提高SAPO-34分子筛的催化性能，以坡缕石为硅源，四乙基氢氧化铵为模板剂，采用模板辅助法合成Co、Ni、Zn改性SAPO-34分子筛. 金属改性的SAPO-34分子筛通过XRD、SEM、XPS、N ₂ -吸附-解吸、NH ₃表征-TPD、FTIR、ICP-AES 和 TG。四乙基氢氧化铵的N原子对三种金属离子表现出不同的作用力，从而进一步调节了分子筛的酸度。与浸渍法制备的金属改性SAPO-34分子筛相比，模板辅助制备的金属改性SAPO-34分子筛具有更高的表面积、更大的孔容和更好的金属分散性。在固定床反应器中研究了模板辅助法制备的金属改性SAPO-34分子筛在甲醇制烯烃(MTO)反应中的催化性能。在反应温度为400℃，反应压力为0.1 MPa，进料WHSV为2.0 h ^-1的反应条件下催化剂质量为0.5 g，Ni改性SAPO-34分子筛甲醇转化率高，对轻烯烃选择性高。轻烯烃的选择性达到95.7%。