Ni-Pt/γ-Al2O3催化剂用于甲基环己烷催化脱氢的研究

摘要

采用自制的比表面积为349 m2/g的纳米膜γ-Al2O3为载体,用等体积浸渍法制备了Ni-Pt/γ-Al2O3催化剂,采用比表面积测定、X射线衍射、扫描电镜和透射电镜等手段对所制备的催化剂进行了表征.利用微型连续管式反应器与气相色谱联用装置,考察了Ni-Pt/γ-Al2O3催化剂对甲基环己烷(MCH)气相脱氢的催化性能.结果表明,使用20％ Ni-0.5％ Pt/γ-Al2O3 催化剂,在反应温度350℃,混合进样体积空速252 h-1条件下,甲苯转化率达到96.99％,选择性接近100％.%A Ni-Pt bimetal catalyst (Ni-Pt/γ-Al2O3) supported on self-synthesized γ-Al2O3 nano-film with a surface area of 349 m2/g was prepared via conventional impregnation method. The catalyst was characterized by BET,XRD,SEM and TEM and its performance in methylcyclohexane (MCH) dehydrogenation was evaluated in a fixed-bed microreactor connecting with a gas chromatograph. The results showed that under 350℃ and a volume gas space velocity of 252 h-1,the conversion of MCH over the 20% Ni-0.5% Pt/γ-Al2O3 catalyst reaches 96. 99% and the selectivity to toluene approaches 100%.