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Design and Optimization of Carbon-Based Bimetallic Catalysts for Catalytic Cracking of Tar Model Compounds
Peng He1,2, Niyu Yao1, Xiang Xu1
1School of Energy Science and Engineering, Central South University, Changsha, Hunan, China.
Abstract:
Biomass tar from pyrolysis restricts the practical engineering application of biomass gasification. Carbon-based bimetallic Ni-based catalysts modified by Cu and Co promoters were synthesized to boost catalytic performance for toluene cracking. Physicochemical characterizations under two preparation atmospheres reveal that Ni-Cu and Ni-Co alloys raise surface Ni° content and inhibit metal oxidation. Uniformly dispersed tiny metal particles also increase hydrogen concentration in product gas. Experimental results show that Ni4-Cu1-H delivers excellent low-temperature activity at 600°C, while Ni4-Co1-H achieves a maximum hydrogen selectivity of 75% owing to smaller metal grains. Stability tests confirm Ni4-Cu1-H maintains the best activity after 300 min reaction. Comparative characterizations of fresh and spent catalysts clarify the anti-deactivation mechanism of bimetallic catalysts: they suppress amorphous carbon graphitization and alter carbon deposition forms, thus slowing catalyst deactivation.
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