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制备了一系列Ni-Mo/γ-Al2O3催化剂,并采用X射线衍射、乙酸程序升温表面反应、NO-红外漫反射光谱、乙酸(或乙醇)-红外漫反射光谱等表征手段系统研究了助剂Mo的加入对Ni基催化剂的物化性质、乙酸加氢脱氧(HDO)产物、HDO活性位及乙酸(或乙醇)吸附形态的影响.结果表明,Mo的加入可提高活性组分NiO的分散度,且能抑制乙酸C-C键的断裂;Mo的加入可提供氧空穴,以促进乙酸C-O键及中间产物乙醇C-O键的断裂,显著提高了Ni基催化剂的HDO活性和产物C2H6的选择性.表明Mo的加入改变了Ni催化剂HDO的催化作用机理.
A series of Ni-Mo / γ-Al2O3 catalysts were prepared and characterized by means of characterization such as X-ray diffraction, temperature programmed reaction with acetic acid, NO-IR diffuse reflectance spectroscopy and acetic acid (or ethanol) The effect of Mo addition on the physico-chemical properties of Ni-based catalysts, HDO production, HDO active sites and acetic acid (or ethanol) adsorption morphology was studied.The results show that the addition of Mo can improve the dispersion of NiO, And can inhibit the cleavage of the CC bond of the acetic acid. The addition of Mo can provide oxygen vacancies to promote the cleavage of the CO bond of the acetic acid and the ethanol CO bond of the intermediate product, significantly increasing the HDO activity of the Ni-based catalyst and the selectivity of the product C2H6. The addition of NiO catalyst changed the catalytic mechanism of HDO.