PREPARATION OF Cu1/Y CATALYST BY CuCl2 PRECUSOR FOR VAPOR METHANOL OXIDATIVE CARBONYLATION

摘要

IntroductionDimethyl carbonate (DMC) has recently attracted much attention for its manifold applicability as a monomer in phosgene free polycarbonate processes, as an environmentally benign methylation agent, and as a possible gasoline blending component due to its high oxygen content, low toxicity, and rapid biodegradability. The latter application may become attractive considering the current debate over potential groundwater contamination by the gasoline oxygenate methyltert butyl ether (MTBE). The vapor phase oxidative carbonylation of methanol has been considered as the most promising way to produce DMC for its unique advantage[1]. Cu/zeolite catalyst prepared by solid-state ion exchange of CuCI with H-zeolite has more stable catalytic activity[2]. CuCl2 can be decomposited into CuCl and Cl2 when it was treated in high temperature and CuCl2 is also cheaper than CuCl, In respect that, CuCl2 as a precursor was used to prepare a copper catalyst supported on DASY zeolite by solid state ion exchange. No studies was reported in ion-exchange of CuCl2 and H-type zeolite. In this paper, it is testified by XRD that: CuCl2 decomposed into CuCI at high temperature, CuC^/DASY were prepared using CuCl2 as precursor by solid state ion exchange. Based on X-ray diffraction and elementary analysis techniques, the effect of preparation temperature was investigated.