原料中杂质对异丁烷脱氢Pt-Sn-K/Al2O3催化剂性能的影响

采用固定床法考察了原料异丁烷中乙硫醇、甲醇、正丁烷和1-丁烯等杂质对Pt-Sn-K/Al₂O₃催化剂上异丁烷脱氢制异丁烯反应性能影响,反应产物使用气相色谱进行分析.实验结果表明,在异丁烷脱氢制异丁烯正常反应条件下,即温度580℃、压力0.1MPa、进料组成H₂/i-C₄H₁₀(体积比)= 2、总空速GHSV = 2000h^-1、GHSV(i-C4H10)= 667h^-1,乙硫醇、甲醇、正丁烷和1-丁烯对Pt-Sn-K/Al₂O₃催化剂的异丁烷转化率和异丁烯选择性均有较大的影响,且杂质含量越高,对催化剂的转化率和选择性影响越大.并对杂质造成催化剂失活的原因进行了分析.

Influence of impurities on the performance of Pt-Sn-K/Al2O3 catalyst for isobutane dehydrogenation

Effect of impurities,such as ethyl mercaptan,methyl alcohol,butane and 1-butylene,on the performance of Pt-Sn-K/Al₂O₃ catalyst in the reaction of isobutane dehydrogenation to isobutene was investigated on a fixed bed reactor,and the product was analyzed by gas chromatography. The results showed that ethyl mercaptan,methyl alcohol,butane and1-butylene all had great influence on the isobutane conversion and isobutene selectivity of Pt-Sn-K/Al₂O₃ catalyst under the reaction condition of isobutane dehydrogenation to isobutene,i.e. at the temperature of 580℃,pressure of 0.1MPa,feedstock of H₂/i-C₄H₁₀(V)= 2,total space velocity GHSV= 2000h^-1,GHSV(i-C₄H₁₀)= 667h^-1;and the higher the impurities content was,the greater the influence was. Furthermore,how the impurities caused the deactivation of catalyst was analyzed.