High efficient catalysis for hydrogenation of 1,4-butynediol to 1,4-butanediol via Raney nickel
Nickel-aluminum alloys with different Ni2Al3 mass fractions were prepared by controlling the heating current.Two kinds of granular Raney nickel catalysts were then synthesized,respectively,by pre-etching and two-step etching of the nickel-aluminum alloy with high Ni2Al3 mass fraction,and were characterized by ICP,BET,XRD,XPS and SEM,and then were used for hydrogenation of 1,4-butynediol(BYD)to 1,4-butanediol(BDO).The results showed that under the conditions of temperature of 140℃,pressure of 5 MPa and reaction time of 1.0 h,the catalyst obtained by two-step etching achieved a BYD conversion rate of 100%and a BDO yield of 92.0%,while it took 3.0 h for the pre-etching catalyst to obtain the same BDO yield.Compared with that obtained by pre-etching method,the catalyst obtained by two-step etching method exhibited larger specific surface area(12.83 m2/g),more obvious surface microstructure,more abundant defective active sites,with the mass fraction of Ni reaching 63.36%.In addition,the increased dispersion of metal Ni,the complete disappearance of metal Al and the increase of Al and Ni oxides all made the skeleton structure of the catalyst surface more stable,which significantly improved its catalytic activity.
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