Effect of Zr on the structure and the hydrogenation properties for cinnamaldehyde of Ni/Ti3C2 catalyst
NiZr/Ti3C2(Ni mass fraction 10％)catalysts with a Zr supporting amount of 5％—15％were prepared by a KBH4 reduction method,and the effect of the Zr addition on the structure of the Ni/Ti3C2 catalyst and its catalytic activities for cinnamaldehyde selective hydrogenation were investigated by characterization combined with cinnamaldehyde selective hydrogenation on the catalysts.The results showed that with the increase in the Zr supporting amount,the agglomeration of Ni metal particles decreased,and the Ti3C2 support of the catalysts exhibited a well-defined layer structure.The specific surface area of the catalysts increased first and then decreased,while the types of surface acid sites changed little.Among them,the 10Ni10Zr/Ti3C2 catalyst exhibited a smallest average Ni active metal particle size and a maximum specific surface area of 132.8m2/g,as well as the Brønsted acid strength and stability was slightly enhanced,and the Lewis acid strength and stability was decreased,showing the optimal catalytic activity.Under the same reaction conditions,on the 1ONi10Zr/Ti3C2 catalysts,the cinnamaldehyde conversion was increased from 92.57％to 98.34％,the hydrocinnamaldehyde selectivity was increased from 91.15％to 94.81％,the hydrocinnamaldehyde yield was increased by 8.86％compared with the 10Ni/Ti3C2 catalyst.Furthermore,the 10Ni10Zr/Ti3C2 exhibited a high stability in cycling experiments.
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