期刊
ENERGIES
卷 14, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/en14051501
关键词
hydrogen; formic acid; palladium; nitrogen; carbon nanotubes
资金
- Russian Science Foundation [17-73-30032]
- Russian Science Foundation [17-73-30032] Funding Source: Russian Science Foundation
Bamboo-like nitrogen-doped carbon nanotubes were utilized to synthesize supported palladium catalysts for hydrogen production via formic acid decomposition. The presence of nitrogen centers in N-CNTs plays a beneficial role in forming active isolated palladium ions and dispersed palladium nanoparticles. The activity of the catalysts is determined by the ionic capacity of N-CNTs and dispersion of metallic nanoparticles stabilized on the nitrogen centers.
Bamboo-like nitrogen-doped carbon nanotubes (N-CNTs) were used to synthesize supported palladium catalysts (0.2-2 wt.%) for hydrogen production via gas phase formic acid decomposition. The beneficial role of nitrogen centers of N-CNTs in the formation of active isolated palladium ions and dispersed palladium nanoparticles was demonstrated. It was shown that although the surface layers of N-CNTs are enriched with graphitic nitrogen, palladium first interacts with accessible pyridinic centers of N-CNTs to form stable isolated palladium ions. The activity of Pd/N-CNTs catalysts is determined by the ionic capacity of N-CNTs and dispersion of metallic nanoparticles stabilized on the nitrogen centers. The maximum activity was observed for the 0.2% Pd/N-CNTs catalyst consisting of isolated palladium ions. A ten-fold increase in the concentration of supported palladium increased the contribution of metallic nanoparticles with a mean size of 1.3 nm and decreased the reaction rate by only a factor of 1.4.
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