| Abstrakt: |
Control of the dispersion and size of metallic nanoparticles, as well as metal-support interaction, is of vital importance to enhance the catalytic performance of supported metal nanocatalysts. In this work, carbon-supported boron-promoted Ni nanocatalysts (B-Ni) were synthesized via an in situ self-reduction process of hybrid borate-intercalated NiAl-layered double hydroxide/carbon nanocomposites, and the promotional effect of boron on the catalytic performance of Ni nanocatalysts formed in liquid phase hydrodechlorination of chlorobenzene was studied. A series of XRD, TEM, STEM, XPS, low temperature N2 adsorption, and H2 chemisorption results revealed that the resulting spherical B-modified Ni nanoparticles were homogeneously dispersed and anchored tightly on the surface of the carbon support. A suitable amount of boron was essential for the formation of highly dispersed and uniform nanoparticles and pronounced surface Ni-B interaction, as well as strong Ni-B-support interactions, accounting for the significantly enhanced hydrodechlorination activity, in comparison with a B-free Ni catalyst. Moreover, as-synthesized B-Ni nanocatalysts exhibited good stability, without obvious aggregation and loss of active species after five recycles. [ABSTRACT FROM AUTHOR] |
