铝基类水滑石和复合氧化物负载Pt催化剂的制备及对甲基苯酚加氢脱氧反应的催化性能（英文）

Preparation of Al-based layered double hydroxides and corresponding mixed oxides supported Pt catalysts and their performance in the hydrodeoxygenation of p-cresol

采用共沉淀法制备了多种铝基类水滑石,焙烧后得到对应的复合氧化物;以水滑石或复合氧化物为载体,制备了系列Pt基催化剂,研究了该催化剂对甲基苯酚加氢脱氧反应的催化性能。结果表明,Pt基催化剂的性能与载体的组分组成和结构相关;当以不经焙烧的类水滑石做载体时,所制备的Pt基催化剂具有较高的活性。其中,Pt-Ni-Al-H催化剂的加氢脱氧活性最高,对甲基苯酚转化率达到99.8%,甲苯选择性为1.4%,而Pt-Zn-Al-H催化剂的直接脱氧活性最高,在275℃和氢压2 MPa下反应1 h后,甲苯选择性达到84.1%。研究发现,反应过程中所生成的甲基环己烷可进一步发生脱氢反应转化为甲苯,说明所制备的Pt基催化剂具有较好的脱氢活性,可节省脱氧过程中的氢气消耗量。

Al-based layered double hydroxides and corresponding mixed oxides were prepared and used as the supports for the Pt based catalysts;their catalytic performance in the hydrodeoxygenation(HDO)of p-cresol was then investigated.The results indicate that the catalytic performance of Pt based catalysts is related to the composition and structure of the support;Pt directly supported on the Al-based layered double hydroxides exhibits higher activity in p-cresol HDO than that supported on corresponding mixed oxides.Especially,for the HDO at 275℃and 2 MPa for 1 h,the conversion of p-cresol over Pt-Ni-Al-H is 99.8%,with a selectivity of 1.4%to toluene,whereas the selectivity to toluene over Pt-Zn-Al-H reaches 84.1%.Moreover,the Pt based catalysts are also active for the dehydrogenation of methylcyclohexane to toluene,which can effectively reduce the hydrogen consumption in HDO.