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, CO₂ is introduced into PDH as a soft oxidant to eliminate the unfavorable intermediate species Ga^δ+-H_x re-generating Ga³⁺-O pairs, and also minimize coke deposition thereby improving the catalytic performance. In situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy experiments show that CO₂ can effectively eliminate Ga^δ+-H_x. At different temperatures, co-feeding CO₂ during PDH over Ga₂O₃/SiO₂ 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.

由于丙烯供应短缺和页岩气的开发，人们对用于丙烯生产的专用丙烷脱氢 (PDH) 技术越来越感兴趣。由于高活性、低积碳和失活，Ga基催化剂在PDH中具有巨大的潜力。在PDH期间形成的Ga-氢化物降低丙烯的速率、选择性和产率。在这一贡献中，CO ₂作为软氧化剂被引入PDH，以消除不利的中间物种Ga ^{δ +} -H _x再生Ga ³⁺ -O 对，并且还最小化焦炭沉积从而提高催化性能。就地漫反射红外傅里叶变换(DRIFT)光谱实验表明CO ₂可以有效消除Ga ^{δ +} -H _x。在不同温度下，在不同负载量的Ga ₂ O ₃ /SiO ₂催化剂上，PDH过程中CO ₂共进料显着提高了转化率的稳定性和选择性，尤其是后者，为提高PDH工艺的性能提供了新的维度。