Back to Search
Start Over
Abundant hydrogen production over well dispersed nickel nanoparticles confined in mesoporous metal oxides in partial oxidation of methane
- Source :
- International Journal of Hydrogen Energy. 44:30171-30184
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- To improve the stability of Ni catalysts and employ reactive oxygen species in reducible metal oxides, the Ni nanoparticles were confined within mesoporous metal oxides (La2O3, Yb2O3, ZrO2, CeO2) via evaporation-induced self assembly technique utilizing 3D honeycomb-like silica as substrate for partial oxidation of methane (POM). Compared with supported catalysts, the prepared catalysts showed superior catalysts stability especially 3D honeycomb-like ZrO2 and CeO2 supported Ni catalysts (Ni/3HL-ZrO2-SiO2 and Ni/3HL-CeO2-SiO2) due to confinement effect and strong interaction between Ni and metal oxides. CH4 conversion reached 90%–92%. Outstanding catalytic activity was attributed to highly dispersity of active metal. More importantly, abundant hydrogen production was observed over mesoporous CeO2, ZrO2 supported catalysts and the ratio of H2/CO changed from nominal value 2 to 3. DFT theoretical calculations illuminated structural defect sites of reducible support like CeO2, ZrO2 afforded generation of surface hydroxyl group, which can be regenerated by activation of water and reoxidation of CeO2, ZrO2. Hydroxyl group was beneficial to accelerate greatly water gas shift reaction, promoting the production of hydrogen. This may provide a strategy to regulate production composition of POM to expand its downstream process.
- Subjects :
- Hydrogen
Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Water-gas shift reaction
0104 chemical sciences
Catalysis
Metal
Nickel
Fuel Technology
chemistry
Chemical engineering
visual_art
visual_art.visual_art_medium
Partial oxidation
0210 nano-technology
Mesoporous material
Hydrogen production
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 44
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi...........d9a8375cab20dcc3501b69633ddb1e21