Alkylation of benzene to value-added, high octane number and low toxic toluene and xylenes provides a way to lower benzene content in gasoline pool, and is hence a method to promote fuel quality. On the other hand, CO₂ accumulation in the atmosphere causes global warming and requires effective route for its valorization. Utilization of CO₂ as a carbon source for benzene alkylation could achieve both goals. Herein, alkylation of benzene with CO₂ and H₂ was realized by a series of low-cost bifunctional catalysts containing zinc/titanium oxides (Zn/Ti oxides) and HZSM-5 molecular sieves in a fixed-bed reactor. By regulating and controlling oxygen vacancies of Zn/Ti oxides and the acidities of HZSM-5, benzene conversion and CO₂ conversion reached 28.7% and 29.9% respectively, along with a total selectivity of toluene and xylene higher than 90%. In this process, more than 25% CO₂ was effectively utilized and incorporated into the target products. Moreover, the mechanism of the reaction was analyzed and the course was simultaneously traced. CO₂ was transformed into methanol firstly, and then methanol reacted with benzene generating toluene and xylene. The innovation provides a new method for upgrading of fuels and upcycling the emissions of CO₂, which is of great environmental and economic benefits.

苯烷基化为高附加值，高辛烷值和低毒的甲苯和二甲苯提供了降低汽油库中苯含量的方法，因此是提高燃油质量的一种方法。另一方面，CO ₂在大气中的积累会导致全球变暖，并需要有效的途径来实现其增值。利用CO ₂作为苯烷基化的碳源可以实现两个目标。在此，通过在固定床反应器中通过一系列包含锌/钛氧化物（Zn / Ti氧化物）和HZSM-5分子筛的低成本双功能催化剂实现了苯与CO ₂和H _2的烷基化。通过调节和控制Zn / Ti氧化物的氧空位和HZSM-5的酸度，苯转化率和CO_2的转化率分别达到28.7％和29.9％，并且甲苯和二甲苯的总选择性高于90％。在此过程中，有效利用了超过25％的CO ₂并将其掺入目标产品中。此外，分析了反应机理并同时追踪了反应过程。首先将CO ₂转化为甲醇，然后甲醇与苯反应生成甲苯和二甲苯。该创新提供了一种新的方法来升级燃料和提高CO ₂排放的循环利用，这具有巨大的环境和经济效益。