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selectivity. The Pt dispersion on the Pt0.5/θ-Al2O3 catalyst increased with the Sn addition up to 0.75 wt%. The highest Pt metal dispersion was observed on the Pt0.5Sn0.75 catalyst. The conclusion was given to the Sn effects on the increase of Pt dispersion to enhance the activity as well as on the electronic and geometric effect of PtSn alloy to increase the stability and olefin selectivity.