Preparation of Ni/Ti3C2(MXene)catalyst and its catalytic performance for selective hydrogenation of cinnamaldehyde
A series of Ni/Ti3C2 catalysts with Ni loading(theoretical mass fraction of Ni,the same below)of 5％～20％were prepared by KBH4 reduction method from multilayered Ti3C2(MXene)carrier,which was obtained using hydrofluoric acid as etchant and Ti3AlC2 as raw material,characterized by XRD,FTIR,SEM,N2 adsorption-desorption,NH3-TPD,CO2-TPD and analyzed for their catalytic performance for selective hydrogenation of cinnamaldehyde.The results showed that The Ni/Ti3C2 catalyst with 10％Ni loading(denoted as 10Ni/Ti3C2)exhibited the best performance,with a well-defined layer structure and its Ni metal particles uniformly loaded on the surface of Ti3C2,a specific surface area of 9.6 m2/g,the smallest average metallic Ni particle size(43.59 nm)and the highest dispersion(0.21％).The specific surface area and acid site strength of Ni/Ti3C2 increased gradually with the increment of Ni loading,but the types of acid sites on the surface showed no much change.10Ni/Ti3C2 exhibited strong Lewis acid sites(NH3 desorption peak at approximately 511 ℃)and good thermal stability.Under the conditions of H2 pressure 2.0 MPa,30 mL isopropyl alcohol as solvent and reaction temperature 120 ℃,0.5000 g 10Ni/Ti3C2 catalyzed 1.0000 g cinnamaldehyde for selective hydrogenation for 3.0 h,the cinnamaldehyde conversion and phenylpropyl alcohol selectivity reached 100％and 99.29％,respectively.In four cycles,10Ni/Ti3C2 exhibited high catalytic stability with 100％cinnamaldehyde conversion and 99.29％～92.07％hydrocinnamyl alcohol selectivity.
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