To achieve high selectivity of styrene from toluene and methanol, a new strategy, the coupling of methanol dehydrogenation and side-chain alkylation of toluene by ternary composite catalyst combining methanol dehydrogenation, B/SiO₂ and CsX components, is proposed. The methanol dehydrogenation component could promote the in-situ formation of formaldehyde (HCHO) intermediate, transferring to B/SiO₂ and CsX components. The formation of HCHO over dehydrogenation component is driven by the side-chain alkylation reaction over CsX-B/SiO₂ during the coupling reaction. In addition, B/SiO₂ is beneficial to stabilize HCHO. When CuO/SiO₂ is applied as the dehydrogenation component, the styrene and ethylbenzene yield reaches 31.0 % at a methanol conversion of 60.1 % with the styrene/ethylbenzene molar ratio in products of 3.1 over CsX-CuO/SiO₂-B/SiO₂. The effective method to prepare a ternary composite catalyst provide helpful guideline for developing a more efficient CsX-based catalyst for conversion of toluene with methanol into styrene in the further.

为了实现苯乙烯对甲苯和甲醇的高选择性，提出了一种新的策略，即结合甲醇脱氢，B / SiO ₂和CsX组分的三元复合催化剂进行甲醇脱氢和甲苯侧链烷基化的偶联。甲醇脱氢组分可以促进甲醛（HCHO）中间体的原位形成，转移为B / SiO ₂和CsX组分。在偶联反应过程中，通过CsX-B / SiO _2上的侧链烷基化反应，可驱动脱氢组分上HCHO的形成。另外，B / SiO ₂有利于稳定HCHO。当CuO / SiO ₂如果将其用作脱氢组分，则在CsX-CuO / SiO ₂ -B / SiO _2上，产物中苯乙烯/乙苯的摩尔比为3.1，甲醇转化率为60.1％时，苯乙烯和乙苯的收率达到31.0％。制备三元复合催化剂的有效方法为开发更有效的CsX基催化剂提供了有益的指导，该催化剂进一步将甲苯和甲醇转化为苯乙烯。