胶束化行为对Cu-HMS介孔分子筛结构及催化性能的影响

The Effect of Micelle Behaviors on Pore Structure and Catalytic Performance for Cu-HMS Mesoporous Molecular Sieve

摘要:

通过改变EtOH/H2O比，制备了一系列不同粒径和比表面积的Cu-HMS分子筛，使用红外，XRD，SEM和BET对其进行表征，研究不同乙醇/水的用量下，胶束化行为对Cu-HMS结构和表面形貌的影响。不同粒径的Cu-HMS与活性组分PdCl2结合制成氧化羰基合成碳酸二乙酯的催化剂，均表现出较好的选择性。其中EtOH/H2O比为1.0的Cu-HMS分子筛，由于较大的比表面积在相同钯含量下表现出较高的催化活性。

Abstract:

Copper-containing hexagonal mesoporous molecular sieve Cu-HMS were synthesized by adjusting ethanol/water ratio of synthetic system. The effects of micelle behaviors on structure and surface morphology on structure and surface morphology were characterized by infrared resonance (IR) spectroscopy, X-ray powder diffraction(XRD), scanning electron microscopy (SEM) and N2 adsorption–desorption. All the PdCl2/Cu-HMS catalysts exhibited high selectivity for diethyl carbonate (over 99.0%) by oxidative carbonylation of ethanol in the gas-phase reaction. An optimized ethanol/water molar ratio existed for catalytic performance, which was about 1. The PdCl2/Cu-HMS catalyst exhibited higher catalytic performance, which is attributed to the fact that the larger surface area would facilitate the dispersion of the active component Pd, as well as the electron transfer of catalytic active sites Cu and Pd.