Influence of Preparation Methods on n-Dodecane Dehydrogenation Performance of Pt-Sn-K-Mg/γ-Al2O3 Catalysts
Pt-Sn-K-Mg/γ-Al2O3 catalysts were prepared by sequential impregnation,ethanol co-impregnation and hydrochloric acid co-impregnation using n-dodecane dehydrogenation as a probe reaction,and the effects of impregnation sequence and solvent on the structure-activity relationship of the catalysts were investigated by using characterization methods such as NH3-TPD,CO pulse adsorption,H2-TPR and quasi-in situ XPS.The results showed that the catalyst prepared by co-impregnation with hydrochloric acid aqueous solution exhibited the best initial activity and better stability.The increase of weakly acidic sites of the catalyst facilitated the dispersion of Pt,which improved the catalytic performance.The co-impregnation method using ethanol as the solvent is more favorable to the formation of stronger interactions between PtSn to generate more PtSn alloys,which is unfavorable to the initial activity but has less effect on the selectivity.
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