Study On Preparation Of Co-Mo Sulfur-Resistant Shift Catalyst

In the CO shift technology, the Co-Mo sulfur-resistant shift catalyst made by the traditional preparation gains popularity because of it's high catalytic activity, long lifetime, outstanding sulfur and poison resistance, excellent selectivity. However, plenty of strong aqua ammonia will be consumed during the process of catalyst preparation, which does not only harm to the safety of workers, but also pollutes the surrounding environment.This paper studies the preparation technology of a new Co-Mo sulfur-resistant shift catalyst. The active components of cobalt and molybdenum are loaded on the supports at two stags. The active component of molybdenum is loaded on the supports with the method of mixing and kneading. Compared with the traditional impregnating method to load the two active components, it settles the problem of environmental pollution which is caused by the plenty of strong aqua ammonia needed to promote the solution of cobalt and molybdenum in the traditional preparation of impregnating solution. The active component of cobalt is loaded on the supports with the impregnating method.In the process of studying the activity of this new technology catalyst, the atmosphere micro-reactor were adopted to study the effects of different active components contents on the shift activity of the catalyst and got the optimum active components content CoO 1.0 wt%,MoO37.0～9.0wt%,K2O 5.0～7.0wt%. Simultaneously, it also studied the influences of different technological conditions on the shift activity of the catalyst and got the optimum technological condition as follows:space velocity is 3000h-1;water-gas ratio is 0.8. The experiment shows that such catalyst has good thermal stability.This research compared the CO conversion ratios of this new technology catalyst with that of industrial Co-Mo catalyst under the same process conditions. The CO conversion ratios of this new technology catalyst could reach to 90% or more at intermediate temperate and it's activity is superior to industrial catalyst. It shows that the new technology catalyst not only solves the problem of strong aqua ammonia polluting environment during the preparation process, but also has high catalytic activity. So the prospects for industrial applications of such catalyst are optimistic.