摘要
采用物理吸附、EPMA、XRD。IRS、碱性气体吸附和异丙苯裂解反应等手段,研究了Ga对载体表面结构和催化剂酸性的影响。结果表明,在催化剂内Ga呈均匀的径向分布,且高度分散在载体表面上,部分离子态Ga还嵌入氧化铝的表层,进而导致催化剂的表面酸性特征发生变化,总之,Ga的引人调变了催化剂的B酸性,其变化规律与Ga含量有关。
The effect of Ga on the surface structure of support and the acidity of Pt-Ga/Al2O3 catalysts was studied by using EPMA, XRD, IR, physical adsorption, frontal adsorption of basic gases and cumene cracking. The results show that the radial distribution of Ga species in the catalyst is uniform, and Ga is highly dispersed on the support, and that a part of Ga ions inserts into the surface layer of the support, resulting in the significant change of surface acidity of the catalyst. In general, the addition of Ga changes the B acidity of the catalysts, but the role of Ga is varied with the Ga loading.
