Effect of complexant on the performance of catalysts for thiol production
A cobalt molybdenum impregnation solution was prepared using cobalt nitrate and ammonium heptamolybdate as raw materials.Tartaric acid(TA),citric acid(CA),and ethylenediamine tetraacetic acid(EDTA)were added to the impregnation solution and impregnated onto a carrier containing meso-porous silicon to prepare a series of catalysts.By characterization of N2 adsorption-desorption,HRTEM,H2-TPR,NH3-TPD,etc.,it was found that the addition of a complexing agent reduced the interaction force between the active metal and the carrier,which was conducive to the formation of more Class Ⅱactive phases,with longer crystal length and more crystal layers.At the same time,it has a larger specific surface area and pore volume,and the acidity and medium strength of the acid are also increased.Therefore,catalysts with added complexing agents have higher conversion and thiol selectivity.
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