SAPO-34 catalysts with high selectivity for light olefins were first synthesized via the introduction of phosphomolybdic acid (HPMo) and AlPO₄-5 zeolite into the initial gel. The physical and chemical characteristics of the synthesized catalysts were determined by a series of techniques and the catalytic performance of the modified composite zeolites for the methanol-to-olefin (MTO) reaction was investigated. The results indicated that HPMo-modified SAPO-34 was featured with more Brønsted acid sites, more mesopores, and a smaller crystal size, thereby demonstrating superior catalytic performance. The further combination with AlPO₄-5 (16.7 wt%) prolonged the lifetime of the HPMo-modified SAPO-34, which is thought in this paper related to its 12-ring straight channel (0.7–0.8 nm) and the absence of any Brønsted acid sites. The MTO tests showed that the light olefins selectivity for the modified composite zeolites reached 95.1 %, while the catalyst lifetime remained at 445 min

_{通过将磷钼酸(HPMo)和AlPO 4} -5 沸石引入初始凝胶中，首先合成了对低碳烯烃具有高选择性的SAPO-34催化剂。通过一系列技术测定了合成催化剂的物理和化学特性，并研究了改性复合沸石对甲醇制烯烃（MTO）反应的催化性能。结果表明，HPMo修饰的SAPO-34具有更多的布朗斯台德酸位、更多的介孔和更小的晶体尺寸，从而表现出优异的催化性能。_{与 AlPO 4} -5 (16.7 wt%)的进一步结合延长了 HPMo 修饰的 SAPO-34 的寿命，本文认为这与其 12 环直通道 (0.7–0.8 nm) 以及不存在任何布朗斯台德酸性位点。MTO测试表明，改性复合沸石的轻质烯烃选择性达到95.1%，催化剂寿命保持在445 min