Cesium exchanged X zeolites (CsX) have been widely used as the catalyst for toluene side-chain alkylation with methanol to produce styrene. In this work, copper oxide was recognized as an efficient promoter to improve the performance of CsX catalyst in both the reactivity and styrene selectivity. Based on systematic characterization of CuO modified CsX samples and further analysis of their catalytic performance, the promoting effect of CuO additive was explored. On one hand, the introduced Cu species promoted the dehydrogenation of methanol to formaldehyde, which acted as real alkylating agent and enhanced toluene conversion. On the other hand, the catalyst acid-base property was sensitively modulated, and thereby the undesired transfer hydrogenation of styrene to ethylbenzene was suppressed. Furthermore, the universality of CuO promoter was proved by loading on some well-known catalysts (Cs₂O/CsX, B₂O₃/CsX and ZnO/CsX), and the effect of reaction condition was also studied with the most efficient CuO–B₂O₃/CsX catalyst.

铯交换的X沸石（CsX）已被广泛用作甲苯与甲醇进行甲醇侧链烷基化以生产苯乙烯的催化剂。在这项工作中，氧化铜被认为是提高CsX催化剂在反应性和苯乙烯选择性方面性能的有效促进剂。在对CuO修饰的CsX样品进行系统表征并进一步分析其催化性能的基础上，探讨了CuO添加剂的促进作用。一方面，引入的铜物质促进了甲醇的脱氢成甲醛，甲醛起到了真正的烷基化作用，并提高了甲苯的转化率。另一方面，敏感地调节了催化剂的酸碱性质，从而抑制了苯乙烯向乙苯的不希望的转移氢化。此外，₂ O / CsX，B ₂ O ₃ / CsX和ZnO / CsX），并用最有效的CuO–B ₂ O ₃ / CsX催化剂研究了反应条件的影响。