Mitigating catalyst deactivation in the industrially deployed process of methanol-to-olefins conversion over HSAPO-34 is a critical challenge. Here, we demonstrate that lifetime in methanol-to-olefins catalysis over HSAPO-34 at sub-complete methanol conversion, as determined by the cumulative turnover capacity per Brønsted acid site towards hydrocarbon products in the effluent before complete catalyst deactivation (~15% carbon final conversion), can be enhanced with increasing efficacy (~2.8× to >70×) by co-feeding H₂ at increasing partial pressures (400–3,000 kPa) in the influent with methanol compared with co-feeding helium at equivalent pressures. The lifetime improvement in the presence of high-pressure H₂ co-feeds is observed to be more prominent at complete methanol conversion than at sub-complete conversion. The improvements in catalyst lifetime by co-feeding H₂ are rendered without any deleterious effects on C₂–C₄ olefins selectivity, which remains ~85% carbon irrespective of the inlet H₂ pressure. These observations can be rationalized based on the participation of H₂ in hydrogen transfer reactions, and in effect, the interception of pathways that promote the formation of deactivation-inducing polycyclic species.

在通过HSAPO-34进行的甲醇制烯烃转化的工业应用过程中，减轻催化剂失活是一项严峻的挑战。在这里，我们证明了在不完全甲醇转化时，HSAPO-34在甲醇制烯烃催化中的寿命，这取决于每个布朗斯台德酸位点对催化剂完全失活之前废水中烃类产物的累积周转能力（〜15％碳）。与在相同压力下共同进料氦气相比，通过在甲醇中增加分压（400–3,000 kPa）下共同进料H ₂可以提高功效（〜2.8倍至> 70倍），从而提高效率。高压H ₂存在下的寿命提高观察到在甲醇完全转化时，共进料比在亚完全转化时更重要。通过共同进料H ₂可以提高催化剂寿命，而对C ₂ -C ₄烯烃的选择性没有任何有害影响，无论入口H ₂压力如何，C ₂ -C ₄烯烃的选择性都保持在〜85％左右。这些观察结果可以基于H ₂参与氢转移反应而得到合理化，实际上可以基于促进促进失活诱导多环物质形成的途径的截获。