【摘要】 对比研究了在传统微米尺寸和新结构纳米丝光沸石催化剂上二甲醚羰基化合成乙酸甲酯的反应行为. 结果表明, 通过减小分子筛的尺寸到纳米水平, 可以有效提高反应物和产物到达或者脱离反应活性位的效率, 从而提高了二甲醚的转化率; 更重要的是, 抑制了硬积碳的生成, 使催化剂保持了更高的稳定性.更多还原

【Abstract】 As compared to conventional micrometer‐sized mordenite particles,nanometer‐sized mordenite gave a much higher activity and better stability in dimethyl ether carbonylation to methyl acetate by suppressing the deposition of hard coke.A structural analysis revealed that intra‐crystalline diffusion limitation of the reactants and products to and from the active sites inside the channels was greatly decreased by reducing the zeolite size to the nanometer size.更多还原