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Cr对Pt-Sn /γ-Al2O3催化剂丙烷脱氢性能的影响
引用本文:余长林,葛庆杰,徐恒泳,李文钊.Cr对Pt-Sn /γ-Al2O3催化剂丙烷脱氢性能的影响[J].燃料化学学报,2006,34(2):209-213.
作者姓名:余长林  葛庆杰  徐恒泳  李文钊
作者单位:1. The Laboratory of Natural Gas Utilization and Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; 2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
摘    要:通过H2-TPR、O2-脉冲等表征手段,结合丙烷脱氢催化性能考察了助剂Cr对Pt-Sn/γ-Al2O3催化剂反应性能的影响。结果表明,添加少量Cr可显著改善Pt-Sn/γ-Al2O3催化剂的脱氢稳定性,可提高丙烯选择性,降低催化剂表面积炭量。这是由Cr和Pt-Sn之间存在的协同作用引起的,一方面,Pt促进了Cr的还原,生成了可提高丙烯选择性的+3价Cr;另一方面,Cr使Sn变得难于还原,在强还原气氛下保持了活性氧化态价态,进而改善了催化剂的脱氢稳定性。

关 键 词:丙烷脱氢  丙烯  Cr-Pt-Sn/Al2O3  协同作用  
文章编号:0253-2409(2006)02-0209-05
收稿时间:2005-08-31
修稿时间:2005-11-25

Effect of Cr promoter on the performance of Pt-Sn/γ-Al2O3 catalyst for propane dehydrogenation
YU Chang-lin,GE Qing-jie,XU Heng-yong,LI Wen-zhao.Effect of Cr promoter on the performance of Pt-Sn/γ-Al2O3 catalyst for propane dehydrogenation[J].Journal of Fuel Chemistry and Technology,2006,34(2):209-213.
Authors:YU Chang-lin  GE Qing-jie  XU Heng-yong  LI Wen-zhao
Institution:1.The Laboratory of Natural Gas Utilization and Applied Catalysis, Dalian Institute of Chemical Physics Chinese Academy of Sciences, Dalian 116023, China ; 2. Graduate School of the Chinese Academy of Sciences, Beifing 100039, China
Abstract:The effect of Cr addition to Pt-Sn/γ-Al2O3 catalyst on the activity, selectivity and deactivation in the propane dehydrogenation was studied. The fresh catalysts were characterized by H2-TPR and the amount of deposited carbon on used catalysts was analyzed by O2-pulse technology. The results of propane dehydrogenation showed that the addition of Cr to Pt-Sn/γ-Al2O3 catalyst can greatly reduce the deactivation rate and increase the selectivity to propene. The mean yield of propene over Pt-CrSn/γ-Al2O3 catalyst reached 38%, which was higher than that of Pt-Sn/γ-Al2O3 catalyst (about 33%). The O2-pulse experimental showed that the amount of deposited carbon on tri-metallic catalyst was much smaller than that on bimetallic catalyst. The synergetic effect between Cr and Pt-Sn took place. Pt promoted the reduction of Cr6+ to Cr3+, which could increase the selectivity to propene. The addition of Cr to Pt-Sn/γ-Al2O3 also made the reduction of Sn more difficult and stabilizes the oxidation state of tin. The presence of oxidation state of tin would promote the stability of catalyst. This may suggest that the presence of Cr can prevent the formation of PtSn alloy and can promote the stability of Pt-Sn/γ-Al2O3 catalyst in dehydrogenation of propane.
Keywords:Cr-Pt-Sn/Al2O3
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