Selective non-oxidative dehydrogenation of ethanol to acetaldehyde and hydrogen on highly dilute NiCu alloys
Journal Article
·
· Applied Catalysis B: Environmental
- Tufts Univ., Medford, MA (United States). Dept. of Chemical and Biological Engineering
- Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry and Chemical Biology
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nanoscale Synthesis and Characterization Lab.
The non-oxidative dehydrogenation of ethanol to acetaldehyde has long been considered as an important method to produce acetaldehyde and clean hydrogen gas. Although monometallic Cu nanoparticles have high activity in the non-oxidative dehydrogenation of ethanol, they quickly deactivate due to sintering of Cu. In this paper, we show that adding a small amount of Ni (Ni0.01Cu - Ni0.001Cu) into Cu to form highly dilute NiCu alloys dramatically increases the catalytic activity and increases their long-term stability. The kinetic studies show that the apparent activation energy decreases from ~70 kJ/mol over Cu to ~45 kJ/mol over the dilute NiCu alloys. The improved performance is observed both for nanoparticles and nanoporous NiCu alloys. The improvement in the long-term stability of the catalysts is attributed to the stabilization of Cu against sintering. Our characterization data show that Ni is atomically dispersed in Cu. The comparison of the catalytic performance of highly dilute alloy nanoparticles with nanoporous materials is useful to guide the design of novel mesoporous catalyst architectures for selective dehydrogenation reactions.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC); Harvard Univ., Cambridge, MA (United States). Center for Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC52-07NA27344; SC0012573
- OSTI ID:
- 1458624
- Alternate ID(s):
- OSTI ID: 1419112
- Report Number(s):
- LLNL-JRNL--741641; 896020
- Journal Information:
- Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Journal Issue: C Vol. 205; ISSN 0926-3373
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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