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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体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载体进行改性,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得到显著提高。通过对CaO改性条件进行研究,确定最佳的改性条件为:CaO用量占载体质量的20%,焙烧温度600℃,焙烧时间5 h。以改性γ-Al2O3为载体制备的催化剂合成邻苯基苯酚收率最高,可达95.6%。利用XRD、XPS、H2-TPR和NH3-TPD对催化剂进行表征,并结合催化剂的评价结果对使用CaO进行载体改性对邻苯基苯酚收率提高的原因进行了探讨。
The effect of γ-Al2O3 modified by metal oxide on the catalytic performance of 0.5% Pt-5% K2O / γ-Al2O3 catalyst in the dehydrogenation of cyclohexanone dimer to o-phenylphenol was investigated. The γ-Al2O3 carrier was modified with La2O3, Ce2O3, MgO and CaO, and the effects of four kinds of metal oxides on the yield of o-phenylphenol were compared. The results show that, with CaO modified catalyst can be o-phenylphenol yield was significantly improved. Through the study of CaO modification conditions, the optimum modification conditions were determined as follows: the amount of CaO accounted for 20% of the carrier mass, calcination temperature 600 ℃, calcination time 5 h. The yield of ortho-phenylphenol from the catalyst prepared with modified γ-Al2O3 was the highest, up to 95.6%. The catalysts were characterized by XRD, XPS, H2-TPR and NH3-TPD, and the reasons why the yield of o-phenylphenol was increased by CaO carrier modification were discussed in combination with the catalyst evaluation results.