Abstract
Multifunctional composite catalyst for carbonyl sulfide hydrolysis under moderate temperature was prepared by impregnation method. The hydrolysis and deoxidization ability of the prepared catalyst was investigated in a fixed bed reactor. It was found that deoxidization ability of the prepared catalyst was raised by the increase of the content of potassium loading catalyst and reaction temperature. And the concentration of H2S had no effect on deoxidization while COS improved the deoxidization ratio. And deoxidization rates were nearly scaled up with concentration of H2. The hydrolysis ability was decreased by the decrease of the surface basicity.
Highlights
In the process of coal coking, through a series of complex physical and chemical reactions, coal was generated into the coke oven gas eventually
Multifunctional composite catalyst for carbonyl sulfide hydrolysis under moderate temperature was prepared by impregnation method
The results showed that the activity series for heterogeneous hydrolysis of carbonyl sulfide (COS) decreased in the following sequence: Al2O3 > CaO > MgO > TiO2 > ZnO > Fe2O3 > SiO2
Summary
In the process of coal coking, through a series of complex physical and chemical reactions, coal was generated into the coke oven gas eventually. Coke oven gas contains hydrogen sulfide (H2S) and other sulfurous gases including carbonyl sulfide (COS). Shangguan et al [12] prepared the catalyst containing Al2O3 and K2CO3 at low temperature and an improved desulfurization performance was reported. Hydrodeoxygenation refers to the reaction of O2 and H2 generate into H2O to remove oxygen under the influence of deoxidizers. Ni-based deoxidizer has very high hydrodeoxygenation catalytic activity, Ni can react with CO and coke oven gas has some CO. Mo-based deoxidizer has high hydrodeoxygenation catalytic activity, and it still work even in high temperature. In sulfur-containing atmosphere, Mo can generate MoS2 which has better hydrodeoxygenation catalytic activity, so Mo-based deoxidizer can add into middle temperature hydrolysis catalysts to avoid oxygen poisoning. By considering the deoxidization ability of middle temperature COS hydrolysis catalysts added MoO3 and the change law of the deoxidization ability in different reaction conditions, some researches were investigated in this paper
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