γ-Al2O3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

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。

Influence of y-AI203 support modification on the performance of the catalysts for cyclohexanone dimer dehydrogenation to o-phenylphenol

The influence of modification of y/-A12 03 with metal oxides Laz 03, Ce2 03, MgO and CaO on the properties of 0.5% Pt-5% K20/y/-A1203 catalyst for the dehydrogenation of cyclohexanone dimer（dimer） to o-phenylphenol was investigated. The results showed that the catalyst prepared by using y/-A1203 modi- fied with CaO could significantly increase the yield of o-phenylphenol. The highest yield of o-phenylphenol of 95.6% over the catalyst was attained under the optimal modification condition as follows ： CaO dosage 20% of support mass, calcination temperature 600℃, calcination time 5 h. The catalysts were character- ized by XRD, XPS, H2-TPR and NH3-TPD techniques and the effects of CaO modification on the catalyst performance were discussed.