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College of Engineering
Department of Environment and Energy Engineering
1. Journal Articles
The promotion effect of Mo in Ni-supported dealuminated zeolite catalysts for durable methane dry reforming
- Type
- Article
- Citation
- CATALYSIS TODAY, v.479
- Issued Date
- 2027-01
- Abstract
- Ni-based catalysts are widely investigated for dry reforming of methane (DRM) but often suffer from rapid deactivation caused by sintering and oxidation under high-temperature conditions. In this study, NiMo bimetallic catalysts supported on dealuminated mesoporous beta zeolite (DBeta) were synthesized via a vapor-phase metal diffusion method to stabilize Ni nanoparticles within defect-rich zeolite frameworks. Dealumination of the beta zeolite generated silanol nest defects that serve as anchoring sites for metal species, enabling defect-selective metal trapping during vapor-phase synthesis. As a result, highly dispersed Ni-Mo nanoparticles were confined within the porous structure of DBeta. Under DRM conditions, Mo species dynamically transformed into Mo2C, which promoted CO2 activation and mitigated Ni oxidation through a redox cycle. The optimized NiMo0.2/DBeta catalyst exhibited excellent stability, maintaining CH4 and CO2 conversions of 71.0% and 78.3%, respectively, for 100 hat 750 degrees C under a WHSV of 120 L gcat-1 h-1. The enhanced catalytic stability arises from the synergistic effect of defect-mediated metal confinement and dynamic Mo2C formation. This work establishes a defect-directed metal trapping strategy that integrates zeolite defect engineering with dynamic carbide promoters, providing a general design principle for stabilizing transition-metal catalysts under harsh reforming conditions.
- Publisher
- ELSEVIER
- ISSN
- 0920-5861
- Appears in Collections:
- Department of Environment and Energy Engineering > 1. Journal Articles
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