There remain considerable challenges for Cs-based catalysts in gas-phase dehydrochlorination of 1,1,2-trichloroethane (TCE) due to their poor catalytic performance and harsh reaction temperature requirements. In this work, we report a novel supported ionic liquid (IL) phase Cs-based system and evaluate its catalytic performance and mechanism, combining the kinetic and DFT calculations. The optimal Cs-IL/SiO₂ catalyst achieved the TCE conversion of 60% and the selectivity to 1,1-Dichloroethylene (VDC) of 86% under the mild temperature of 200°C. It is demonstrated that IL additives can significantly improve the dispersion of Cs species during the catalyst preparation and evaluation process. Moreover, IL promotes the activation of TCE and enhances the desorption efficiency of HCl, which is the main reason for its high activity. The selectivity is improved by changing the adsorption behaviors of the products, which ensures the preferential formation of the main product VDC. The enhanced activity and selectivity of Cs-IL/SiO₂ suggest a promising candidate for dehydrochlorination reaction.

由于 Cs 基催化剂的催化性能差和反应温度要求苛刻，因此在 1,1,2-三氯乙烷 (TCE) 的气相脱氯化氢中仍存在相当大的挑战。在这项工作中，我们报告了一种新型负载型离子液体 (IL) 相 Cs 基系统，并结合动力学和 DFT 计算评估了其催化性能和机理。最佳 Cs-IL/SiO ₂催化剂在200°C的温和温度下实现了60%的TCE转化率和86%的1,1-二氯乙烯（VDC）选择性。结果表明，IL添加剂可以显着改善催化剂制备和评价过程中Cs物种的分散。此外，IL促进了TCE的活化，提高了HCl的解吸效率，这是其高活性的主要原因。通过改变产物的吸附行为来提高选择性，保证了主产物VDC的优先形成。_{Cs-IL/SiO 2}增强的活性和选择性表明了脱氯化氢反应的有希望的候选者。