新型CuCl／Hβ沸石羰基化催化剂的制备与原位红外光谱表征

采用固态离子交换法在沸石中直接引进Ｃｕ（Ⅰ）活性中心，ＣｕＣｌ分子在Ｈβ沸石中与Ｈ＾＋交换和在沸石内表面单层分散两个过程同时发生，负载阈值为２１．２％（ＣｕＣｌ％），调节ＣｕＣｌ和Ｈβ的配比，可得到从桥羟基被部分交换到所有羟基被完全交换的ＣｕＣｌ／Ｈβ从化剂。

Preparation and Characterization of New CuCl/H Catalysts

CuCl can be directly exchanged and highly dispersed into zeolite H without formation of Cu2+ by solid|state ion exchange method at 573 K, 1.0 10-3 Pa for 24 h. CuCl/H systems with different CuCl ratio were prepared; the critical monolayer dispersion capacity into H of CuCl was 21.2% ( CuCl % ), high dispersion of cuprous chloride molecules can result in more active sites for catalysis and adsorption. From IR in|situ results, it was found that solid|state ion exchange process of cuprous ions and dispersion process of cuprous chloride molecules occur simultaneously during solid|state ion exchange. When the ratio of CuCl is {0.35% ( CuCl% ),} ion|exchange of Cu+ predominated and the intensity of the -OH at 3597 cm-1 band decreases, Cu+ ions are mainly located at SI sites. In contrast, when the ratio of CuCl is 5% and 15%, the bands at 3597, 3635, 3740 cm-1 disappear totally. The XRD results indicated that all CuCl molecules are in monolayer dispersion. The IR spectra of