Selective hydrogenation of phenylacetylene over non-precious bimetallic Ni–Zn/SiO2 and Ni–Co/SiO2 catalysts prepared by glucose pyrolysis
A series of non-precious bimetallic NiM x /SiO 2 (M = Zn or Co) catalysts with a fixed Ni loading of 5 wt% and different molar ratios of M/Ni (0.004–1.97) were prepared by glucose pyrolysis and applied to the selective hydrogenation of phenylacetylene. The properties of the catalysts were characterized by N 2 physisorption, CO chemisorption, ICP-OES, TGA, XRD, HRTEM, XPS, and DRIFTS. The activity and selectivity of the bimetallic catalysts could be tuned by varying the Zn/Ni and Co/Ni molar ratios, which were almost independent of the metal particle size (with a similar size of 4.1–5.5 nm), but predominantly determined by the geometric and/or electronic effects of the catalysts. Among all the catalysts studied, NiZn 0.05 /SiO 2 and NiCo 0.09 /SiO 2 presented higher selectivity to styrene (86.3% and 88.0%, respectively) at above 99% conversion of phenylacetylene. The high selectivity of the former was attributed to the geometric and electronic effects of the Ni–Zn alloy, while the latter was due to the geometric effect caused by the addition of Co. The activity and selectivity of NiCo 0.09 /SiO 2 were maintained during six consecutive cycles, indicating its good stability in the selective hydrogenation of phenylacetylene.
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