Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 39, Pages 15030-15043Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c05906
Keywords
biomass upgrading; N-doped carbon; formic acid; hydrogen production; palladium nanoparticles
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Funding
- MICINN, FEDER [RTI2018-095291-B-I00]
- Generalitat Valenciana [GRISOLIA/2018/105]
- Plan GenT project [CDEI-GENT/2018/027]
- MICINN [IJCI-2016-27636]
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Excellent Pd supported on carbon catalysts for the dehydrogenation of formic acid were synthesized from a lignocellulosic biomass residue. The preparation of the carbon support consisted of a H3PO4-assisted hydrothermal carbonization (HTC) and activation of a hemp residue and subsequent nitrogen functionalization. It was observed that the presence of nitrogen groups influenced both the size and the electronic properties of the Pd nanoparticles, which ultimately affected their catalytic properties. Furthermore, the catalytic performance also depended on the synthesis conditions used in the preparation of the catalysts (i.e., reduction of the Pd nanoparticles with NaBH4 prior to the catalytic test or in situ reduction). The best-performance catalysts (Pd/N-HTC (n.r.)), which were prepared by in situ reduction of the nanoparticles, displayed a remarkable catalytic activity with a very high TOF number of 8365 h(-1) (TOF value calculated for the 2nd catalytic run and expressed per surface Pd atom) and outstanding stability during 6 consecutive reaction cycles, although the initial activity is maintained for 12 cycles. The catalytic system studied is among the most stable ever reported Pd-based heterogeneous catalysts for the dehydrogenation of formic acid.
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