A series of Ni/HZSM-5 catalysts with different Ni-loadings and Si/Al ratios were prepared by incipient wetness impregnation and employed for catalytic hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL). Their physicochemical properties were characterized by X-ray diffraction, nitrogen adsorption–desorption, X-ray photoelectron spectrometer, temperature-programmed desorption of ammonia,transmission electron microscopy, temperature-programmed reduction of hydrogen, and pyridine-adsorbed infrared spectroscopy. The diffraction peaks assigned to Ni phase were not observed, implying that nickel particles were small and had a high dispersion on the supports. The catalysts with a strong acidity and the appropriate ratio of Brönsted (B) acid sites to Lewis (L) acid sites (B/L = 4.9) show an excellent activity and selectivity for the hydrogenation of LA to GVL. High conversion of LA and selectivity towards GVL were achieved over 5 wt% Ni/HZSM-5-50. The maximum GVL yield of 100% over 5 wt% Ni/HZSM-5-50 was obtained under the optimized reaction conditions of 210 °C, 2 h, and 3 MPa initial hydrogen pressure.

通过初期湿润浸渍制备了一系列具有不同Ni负载量和Si / Al比的Ni / HZSM-5催化剂，并将其用于乙酰丙酸（LA）催化加氢成γ-戊内酯（GVL）。通过X射线衍射，氮吸附-解吸，X射线光电子能谱仪，程序升温的氨解吸，透射电子显微镜，程序升温的氢气还原和吡啶吸附的红外光谱对它们的理化性质进行了表征。没有观察到分配给Ni相的衍射峰，这表明镍颗粒小并且在载体上具有高分散性。具有强酸度和布朗斯台德（B）酸位与路易斯（L）酸位的适当比例的催化剂（B / L = 4。9）显示出优异的活性和对LA加氢成GVL的选择性。在5wt％的Ni / HZSM-5-50上实现了LA的高转化率和向GVL的选择性。在210℃，2 h和3 MPa初始氢气压力的优化反应条件下，获得了相对于5 wt％Ni / HZSM-5-50的100％的最大GVL产率。