Journal
ACS APPLIED NANO MATERIALS
Volume 6, Issue 1, Pages 390-397Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c04520
Keywords
Ni-Rh; trace Rh; 1; 2-dichloroethane; catalytic hydrodechlorination activity; ethylene selectivity
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Ni catalysts decorated with trace Rh supported on gamma-Al2O3 were prepared and investigated for the catalytic hydrodechlorination of chlorinated hydrocarbons. The introduction of Rh facilitated the generation of spillover hydrogen, enhancing the H2 activation ability of the Ni catalyst. The bimetallic Ni-Rh/gamma-Al2O3 catalyst exhibited significantly higher 1,2-dichloroethane conversion (37%) and comparable selectivity to ethylene (95%) compared to the monometallic Ni catalyst.
Ni catalysts decorated with trace Rh supported on gamma-Al2O3 were prepared by the co-impregnation method. To obtain the Ni-Rh nanoparticles with different nanostructures and chemical compositions, bimetallic catalysts with varied Ni/Rh molar ratios were prepared. For comparison, monometallic Ni/gamma-Al2O3 and Rh/gamma-Al2O3 catalysts were also prepared by the impregnation method. The selective gas phase catalytic hydrodechlorination of 1,2-dichloroethane to ethylene was used to evaluate catalytic performances of the catalysts. The catalysts were characterized by X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, transmission electron microscopy-energy-dispersive X-ray, and CO chemisorption. It was found that the introduction of Rh to Ni catalyst facilitated the generation of spillover hydrogen which could enhance the ability of the Ni catalyst for H2 activation. In bimetallic catalysts, there was an intimate interaction between Ni and Rh, and isolated Rh sites were formed due to the dilution effect of Ni. Accordingly, compared with the monometallic Ni catalyst for gas phase catalytic hydrodechlorination of 1,2-dichloroethane, the bimetallic Ni-Rh(800)/gamma-Al2O3 catalyst exhibited markedly higher 1,2-dichloroethane conversion (37%) and comparable selectivity to ethylene (95%). The findings in this study indicate that Ni-Rh/gamma-Al2O3 with trace Rh can be used as a promising catalyst for highly effective and selective catalytic hydrodechlorination of chlorinated hydrocarbons.
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