γ-Al_2O_3载体改性对环己酮二聚体脱氢合成邻苯基苯酚催化剂性能的影响  

Influence of γ-A1_2O_3 modification on behaviors of the catalyst for dehydrogenation of cyclohexanone dimer to ο-phenylphenol

作　　者：李杰[1] 屈一新[1] 王水[1] 王际东[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《工业催化》2009年第12期21-26,共6页Industrial Catalysis

摘　　要：研究了利用金属氧化物进行载体γ-Al2O3改性对0.5%Pt-5%K2O/γ-Al2O3催化剂在环己酮二聚脱氢合成邻苯基苯酚反应中催化性能的影响。以La2O3、Ce2O3、MgO和CaO对γ-Al2O3栽体进行改性,比较了4种金属氧化物对生成邻苯基苯酚收率的影响。结果表明,以CaO改性的催化剂可使邻苯基苯酚的收率显著提高。通过对使用CaO改性的条件进行研究,确定了最佳改性条件:CaO用量为γ-Al2O3质量的20%,焙烧温度600℃,焙烧时间5h。以改性γ-Al2O3为载体制备的催化剂合成邻苯基苯酚收率达95.58%。利用XRD、XPS、H2-TPR和NH3-TPD对催化剂进行了表征,并结合催化剂的评价结果,对使用CaO进行载体改性后邻苯基苯酚收率提高的原因进行了探讨。Influence of modification of γ-Al203 by metal oxides（ La2O3, Ce203, MgO, CaO） on behaviors of 0.5% Pt/γ-Al2O3 catalyst for dehydrogenation of cyclohexanone dimer to o-phenylphenol （OPP） was investigated. The results showed that γ-Al2O3 modification by CaO significantly enhanced yield of OPP. The optimum condition for modification of γ-A1203 by CaO was as follows： CaO dosage 20% of γ-Al2O3 mass, calcination at 600 ℃ for 5 h. OPP yield of 95.58% was attained over catalyst using γ-Al2O3 prepared under the optimum condition. The catalysts were characterized by XRD, XPS, H2-TPR and NH3-TPD.

关 键 词：催化化学 邻苯基苯酚 环己酮二聚体脱氢催化剂 γ-Al2O3改性 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]