A novel promoting effect of chelating ligand on the dispersion of Ni species over Ni/SBA-15 catalyst for dry reforming of methane.

A series of Ni/SBA-15 (AM) catalysts were prepared by chelating ligand assisted impregnation method. The results showed that the chelating ligand played a positive promoting role for CH 4 dry reforming with CO 2 over Ni/SBA-15. The electron-pair donor atoms and the high viscosity of chelating agent could inhibit the aggregation of nickel species and contribute to the well-dispersed Ni particles with size of <6 nm. Compared to the Ni/SBA-15 (CM) prepared by conventional impregnation, all the Ni/SBA-15 (AM) exhibited superior catalytic performance, especially the catalyst assisted by ethylenediamine possessed stable activity and the least amount of carbon deposition. [ABSTRACT FROM AUTHOR]