薄壳型氧化催化剂的制备及性能

Preparation of Oxidation Catalyst with Thin-Shell and Its Performance

考察了铂活性组分分布于α-Al2O3载体颗粒外表面的薄壳型催化剂的制备及其在乙苯脱氢-氢氧化反应中的性能.采用沉淀法制备催化剂不仅制备工艺简单,而且通过控制沉淀剂含量可以在0.022 7～0.228 4 mm之间有效调节铂活性组分层的厚度.实验结果表明,在反应温度580℃下,与铂活性组分均匀分布的催化剂相比,薄壳型催化剂上氢氧化选择性提高了约2%,芳烃的损失率降低约80%.薄壳型催化剂在反应中能够及时转移反应放出的热量,因而具有更高的选择性和更好的稳定性.

Preparation of thin- shell catalyst, on which Pt covered on surface of α -Al2O3 grain, was investigated. Performance of catalyst for interstage oxidation of hydrogen in ethyl - benzene dehydrogenation was also studied. Precipitation procedure of manufacturing catalyst was simple and in this process thickness of Pt layer could be adjusted from 0. 022 7 -0. 228 4 mm by controlling precipitator content. Under reaction temperature 580 ℃, selectivity of oxygen in oxidation of hydrogen on thin - shell catalyst increased about 2% , and loss of aromatics was about 80% less comparing with catalyst of uniform Pt distribution. Selectivity and stability of thin- shell catalyst were all good because reaction heat could rapidly be removed from the catalyst.