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比较了微波固相法、普通加热法和简单混合法制备的ZnCl2/NaY及溶液离子交换法制备的ZnNaY在月桂烯与丙烯醛DielsAlder反应中的催化性能,发现微波固相法制备的催化剂表现出最高的环加成选择性和区域选择性.通过对微波固相法制备的催化剂中ZnCl2负载量的考察,揭示了微波诱导ZnCl2在NaY分子筛表面形成了不同催化活性中心的特点,分散在分子筛表面的ZnCl2具有更高的催化活性和区域选择性.微波辐射可成功地将ZnCl2固载于NaY分子筛中,当ZnCl2负载量为63%时,ZnCl2与NaY分子筛主要发生固态离子交换反应;当ZnCl2负载量达25%时,催化活性提高了3倍,区域选择性提高了1倍以上.而且,以微波固相法制备的ZnCl2/NaY催化剂,其环加成选择性和区域选择性随反应温度的升高而下降
The catalytic performance of ZnCl2 / NaY prepared by microwave solid phase method, ordinary heating method and simple mixing method and ZnNaY prepared by solution ion exchange method in Diels-Alder reaction between myrcene and acrolein was compared. It was found that the catalyst prepared by microwave solid phase method Showed the highest cycloaddition selectivity and regioselectivity. Through the investigation of the loading of ZnCl2 in the catalyst prepared by microwave solid-phase method, it was found that the microwave-induced ZnCl2 formed different catalytic active centers on the surface of NaY zeolite. The ZnCl2 dispersed on the surface of zeolite has higher catalytic activity and regioselectivity . ZnCl2 was successfully immobilized on NaY zeolite by microwave irradiation. When ZnCl2 loading was 63%, solid-state ion exchange reaction occurred between ZnCl2 and NaY zeolite. When ZnCl2 loading reached 25%, catalytic activity increased by 3 Times, regional selectivity has more than doubled. Moreover, the ZnCl2 / NaY catalysts prepared by microwave solid-phase method showed a decrease in their cycloaddition selectivity and regioselectivity with increasing reaction temperature