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以环己酮二聚体为反应原料,γ-Al_2O_3为载体,Cu(NO_3)_2和Ni(NO_3)_2作为活性组分前驱体,K_2SO_4作助剂,采用等体积浸渍法制备Cu-Ni-K/γ-Al_2O_3催化剂。通过X射线衍射(XRD)、H_2程序升温还原(H_2-TPR)、NH_3程序升温脱附(NH_3-TPD)表征手段对催化剂进行表征_([1]),并研究了催化剂对环己酮二聚体选择催化脱氢合成邻苯基苯酚的催化活性和选择性。结果表明助剂K_2SO_4的加入,调节了载体的酸碱度,提高了活性组分镍的被还原能力,适宜的反应条件:LHSV0.15 h~(-1)、H_2空速为240mlg~(-1)h~(-1)、反应温度为380℃下,环己酮二聚体的最高转化率为98.7%,邻苯基苯酚的选择性为85%。
Cu-Ni-Cu-Ni-Cu-Ni composite powders were prepared by impregnation with cyclohexanone dimer as raw material, γ-Al 2 O 3 as carrier, Cu (NO 3) 2 and Ni (NO 3) 2 as precursors and K 2 SO 4 as assistant. K / γ-Al 2 O 3 catalyst. The catalysts were characterized by X-ray diffraction (XRD), H 2 temperature-programmed reduction (H_2-TPR) and NH_3 temperature-programmed desorption (NH_3-TPD) Catalytic Activity and Selectivity of Ortho - Phenol for Catalytic Dehydrogenation of Polymeric Selectivities. The results showed that the addition of K_2SO_4 promoted the reduction of acidity and alkalinity of the support and improved the reduction ability of the active nickel. The suitable reaction conditions were as follows: LHSV 0.15 h -1, H 2 space velocity 240 mlg -1, h -1, the maximum conversion of cyclohexanone dimer was 98.7% and the selectivity of o-phenylphenol was 85% at the reaction temperature of 380 ℃.