The pronounced effect of Sn on RhSn catalysts for propane dehydrogenation
- The pronounced effect of Sn on RhSn catalysts for propane dehydrogenation
- 정광덕; 아흐산 자릴; 프라카쉬; 윤성호; 핫스나인아바스; 박대성; 강동찬
- dehydrogenation; propane; propylene; deep dehydrogenation
- Issue Date
- Journal of catalysis
- VOL 392-20
- The pronounced effect of Sn on RhSn/γ-Al2O3 catalysts for propane dehydrogenation (PDH) is studied. A 0.5- wt% Rh/γ-Al2O3 catalyst (Rh(0.5)) without Sn exhibits very low propane (C3) conversion (10.7%) and low selectivity (25.4%) for propylene (C3=) at 600 °C and a WHSV of 10.8 h？1. However, the Sn addition to Rh(0.5) increases both the C3 conversion and the C3= yield. Finally, the Rh(0.5)Sn(3.0) catalyst achieves a C3 conversion of 30.8% and a C3= selectivity of 96.3%. It has been reported that PtSn catalysts show an optimized C3= at the Sn/Pt molar ratio of about 1.0, increasing the propene selectivity at the expense of catalytic activity. This is not the case for the RhSn system. The primary product of Rh(0.5) is methane (65%) at the initial time and severe coke formation covers the exposed Rh metal, resulting in low C3 conversion. Both the C3 conversion and the C3= yield increase with increasing Sn content. The low C3 conversion and C3= yield of Rh(0.5) are ascribed to cracking via
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