Abstract
The upgrading of biogas to value-added syngas through bi-reforming is of enormous significance. The mechanochemical method was adopted to prepare a range of layered double hydroxide-derived bimetallic Ni-Ga catalysts, and the as-prepared catalysts were employed in the bi-reforming of biogas. Comprehensive characterization was carried out to analyze the fresh or spent catalysts. 10Ni10Ga/MgAlO catalyst exhibits high initial catalytic activity in terms of CH4/CO2 conversion (∼96 %/66 %) and satisfying stability up to 120 h without significant deactivation, at 800 ℃ and WHSV = 30,960 mL/g/h. 10Ni10Ga/MgAlO catalyst with direct-reduction pretreatment of catalyst precursor exhibits more homogeneously dispersed active metal sites, which facilitates the dissociation of CH4. Meanwhile, 10Ni10Ga/MgAlO catalyst with electron-rich Ni species, as well as moderately strong and strong basic sites, promotes the CO2 activation, the combined effects result in high initial catalytic activity. In addition, the interaction between active metal site and MgAlO composite oxide, combined with the potential reversible phase transition between Ni3Ga and Ni3GaCx, result into satisfying anti-sintering and anti-coking performance of 10Ni10Ga/MgAlO catalyst, respectively.
Published Version
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