Due to the shortage supply of propylene and the development of shale gas,there is increased interest in on-purpose propane dehydrogenation(PDH)technology for propylene production.Ga-based catalysts have great potentia...Due to the shortage supply of propylene and the development of shale gas,there is increased interest in on-purpose propane dehydrogenation(PDH)technology for propylene production.Ga-based catalysts have great potential in PDH,due to the high activity,low carbon deposit and deactivation.Ga-hydrides formed during PDH reduce the rate,selectivity and yield of propylene.In this contribution,CO_(2)is introduced into PDH as a soft oxidant to eliminate the unfavorable intermediate species Ga^(δ+)-Hx re-generating Ga^(3+)-O pairs,and also minimize coke deposition thereby improving the catalytic performance.In situ diffuse reflectance infrared Fourier transform(DRIFT)spectroscopy experiments show that CO_(2)can effectively eliminate Ga^(δ+)-Hx.At different temperatures,co-feeding CO_(2)during PDH over Ga_(2)O_(3)/SiO_(2)catalysts with different loadings significantly improves the stability of the conversion and selectivity,especially the latter,and provide a new dimension for improving the performance of PDH process.展开更多
文摘Due to the shortage supply of propylene and the development of shale gas,there is increased interest in on-purpose propane dehydrogenation(PDH)technology for propylene production.Ga-based catalysts have great potential in PDH,due to the high activity,low carbon deposit and deactivation.Ga-hydrides formed during PDH reduce the rate,selectivity and yield of propylene.In this contribution,CO_(2)is introduced into PDH as a soft oxidant to eliminate the unfavorable intermediate species Ga^(δ+)-Hx re-generating Ga^(3+)-O pairs,and also minimize coke deposition thereby improving the catalytic performance.In situ diffuse reflectance infrared Fourier transform(DRIFT)spectroscopy experiments show that CO_(2)can effectively eliminate Ga^(δ+)-Hx.At different temperatures,co-feeding CO_(2)during PDH over Ga_(2)O_(3)/SiO_(2)catalysts with different loadings significantly improves the stability of the conversion and selectivity,especially the latter,and provide a new dimension for improving the performance of PDH process.
