氯的脱除对丙烷脱氢PtSnNa/Al2O3催化剂结构的影响

考察了氯的脱除对丙烷脱氢铂锡催化剂结构和反应性能的影响，并采用XRD、N₂吸脱附、TPR、NH₃-TPD、TEM和Raman等方法进行表征。结果表明，氯的脱除温度显著影响催化剂的酸性、孔体积、比表面积、孔径和Pt颗粒尺寸。随着处理温度的提高，催化剂酸性、比表面积、孔体积都呈现下降的趋势，平均孔径增加，Pt颗粒的烧结程度加剧。随着处理温度的增加，催化剂初活性逐渐降低，丙烯选择性增加，稳定性出现先增加后降低趋势。研究表明，氯的较佳的脱除温度为540℃，催化剂具有很好的脱氢性能和稳定性，收率最高。

The effect of chlorine elimination on the structure of PtSnNa/Al2O3 catalyst for propane dehydrogenation

The effect of chlorine elimination on the catalytic performance and structure of PtSnNa/Al₂O₃ catalyst for propane dehydrogenation was studied. The catalysts were characterized by XRD, N₂ adsorption-desorption, TPR, NH₃-TPD, TEM and Raman spectroscopy, respectively. The results showed that the chlorine elimination temperature affected the properties of the catalysts greatly, such as acidity, specific surface area, pore volume, mean pore diameter and the size of Pt particle. With the increase of the treatment temperature, the acidity the specific surface area and pore volume of the catalyst,dramatically decreased, whereas the mean pore diameter increased. Meantime, the extent of Pt sintering was aggravated. At higher treatment temperature, the catalyst has lower initial activity and higher propylene selectivity. But the stability increased firstly and then decreased with the raising of treatment temperature. The highest yield of propylene was obtained with the treatment temperature of 540℃, and the PtSnNa/Al₂O₃ catalyst exhibited the best performance of propane dehydrogenation and stability.