期刊
APPLIED CATALYSIS A-GENERAL
卷 629, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcata.2021.118419
关键词
Formic acid decomposition; nickel-based catalysts; copper based catalysts; bimetallic Ni-Cu catalysts; H2 production
资金
- Spanish Agencia Estatal de Investigacion (AEI)
- EU (FEDER) [CTQ2017-89443-C3-1-R, CTQ2017-89443-C3-3-R, PID2020-119160RB-C21, PID2020-119160RB-C22]
- CONICET
The bimetallic Ni-Cu catalyst doped with potassium exhibited the best catalytic performance in the formic acid decomposition reaction, with high conversion rate and selectivity to hydrogen.
Ni, Cu and Ni-Cu catalysts supported on high surface area graphite were synthesized by incipient wet impregnation. Also, the effect of doping the graphite support with alkali oxides (Li, Na and K) was studied. The catalysts were tested in the formic acid decomposition reaction to produce hydrogen. The bimetallic Ni-Cu catalyst doped with K showed the best catalytic performance with 100% conversion of formic acid at 130 degrees C and a 95% of selectivity to hydrogen. The turnover frequency (TOF) of the catalysts follows the order: Ni-Cu/K > NiCu/Na > Ni-Cu > Ni-Cu/Li. While the order for the apparent activation energy values is: Ni-Cu > Ni-Cu/Li > Ni-Cu/Na > Ni-Cu/K. The mechanism of the reaction is approached by programmed temperature surface reaction (TPSR) experiments and attenuated total reflectance (ATR). The greater catalytic activity of the Ni-Cu catalyst doped with potassium is ascribed to the lower stability of the formate, bicarbonate and carbonate species on its surface.
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