Ni-HAP催化剂的制备及其催化乙醇Guerbet缩合制备高碳醇OA北大核心

To address the challenges of low yield and harsh reaction conditions in the Guerbet condensation of bioethanol for synthesizing higher alcohols(C4-8 alcohols),this study prepared X-Y(X=Co,Cu,Ni;Y=HAP,MgO,Al2O3,CeO2)catalysts via the impregnation method.The catalysts were characterized using X-ray diffraction(XRD),X-ray photo electron spectroscopy(XPS)and other techniques,and their catalytic performances in ethanol Guerbet condensation were evaluated.Results demonstrated that the 10％Ni-HAP-450 catalyst,with 10％Ni loading and calcined at 450 ℃,exhibited optimal performance.Under optimized conditions(250 ℃,6 h),ethanol conversion reached 70.0％,with a C4-8 alcohols yield of 18.5％.The catalyst displayed excellent stability and reusability,retaining ethanol conversion of 54.6％and C4-8 alcohols yield of 17.0％after four reuse cycles.Characterization revealed the structural and acid-base properties governed the catalytic mechanism.The catalyst calcined at 450 ℃ exhibited the largest pore volume when the Ni loading was 10％,while the appropriate Ni loading enhanced active metal dispersion.Temperature programmed desorption(TPD)of CO2(CO2-TPD)and NH3-TPD analyses confirmed the coexistence of moderate-strength basic and acidic sites.During the reaction,basic sites catalyzed aldol condensation for carbon-chain elongation,while metallic centers synergized with acid-base sites to drive the Guerbet reaction,enabling efficient formation of long-chain aliphatic alcohols.