Abstract
A series of Pd-Ni bimetallic catalysts supported on SBA-15 (0.2%Pd-x%Ni/SBA-15, x = 0.4, 0.7, and 1.2) were prepared through the impregnation method combined with the NaBH4 reduction method. X-ray diffraction (XRD), N2 adsorption-desorption, X-ray photoemission spectroscopy (XPS) and transmission electron microscope (TEM) were used to characterize the prepared catalysts. All the synthesized catalysts were evaluated for the liquid-phase hydrogenation of cinnamaldehyde (CAL). The addition of Ni obviously enhanced the CAL conversion and selectivity of C=C hydrogenation to hydrocinnamaldehyde (HALD) over the 0.2%Pd-x%Ni/SBA-15 catalysts. Meanwhile, 0.2%Pd-1.2%Ni/SBA-15 showed the best performance with 96.3% conversion and 87.8% selectivity toward HALD. This improvement was attributed to the synergistic effect between the Pd and Ni nanoparticles, enhancing the dispersion of Pd metal particles and increasing the content of surface Pd0 species. In addition, the influences of a few reaction factors including H2 pressure, reaction temperature, and reaction time were studied over 0.2%Pd-1.2%Ni/SBA-15.
Highlights
The selective catalytic hydrogenation of α, β-unsaturated carbonyl compounds to unsaturated alcohols or saturated aldehydes is an important step for the production of a great deal of chemicals, for instance, pharmaceuticals, spices, and fragrances [1,2,3]
With Pt/SBA-15, which was attributed to the generation of the Pt-Co alloy to increase the amount of the Pd-WN/SBA-15 samples were synthesized, and the results indicated that the addition of WN
The that synthesized bimetallic 0.2%Pd-x%Ni/SBA-15 catalysts exhibited superior performance in the results showed that synthesized bimetallic 0.2%Pd-x%Ni/SBA-15 catalysts exhibited superior hydrogenation of CAL to HALD than their monometallic counterparts
Summary
The selective catalytic hydrogenation of α, β-unsaturated carbonyl compounds to unsaturated alcohols or saturated aldehydes is an important step for the production of a great deal of chemicals, for instance, pharmaceuticals, spices, and fragrances [1,2,3]. Cinnamaldehyde (CAL) is a typical α, β-unsaturated aldehyde, which can produce various product distributions through its hydrogenation route (Scheme 1). Are conductive to the C=O bond hydrogenation to generate cinnamal alcohol (COL), while Pd [23,24], Rh [25,26], Ni [27,28,29] prefer a higher selectivity to the C=C bond, leading to the production of HALD. Ni [27,28,29] prefer a higher selectivity to the C=C bond, leading to ofthe production of HALD.
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