Abstract
The catalytic dehydroaromatization of methane over 3.0%Mo/HZSM-5 and 0.1%Ga-3%Mo/HZSM-5 catalysts were reported. The nature of deposited carbon was characterized by means of XPS, XAES, TG/DTG, HRTEM, and DTA techniques. In XAES study, the type of deposited carbon was characterized based on the fine structures of dN/dE spectra. The results confirm that the sp 2 /sp 3 bonding ratio of coke species increases with on-stream time, suggesting that the deposition of heavier aromatic-type carbon is the main reason for catalyst deactivation. The addition of gallium to 3.0%Mo/HZSM-5 enhances the adsorption of CO x species as well as the formation of alkene (such as ethylene). Therefore, the Ga-modified 3%Mo/HZSM-5 catalyst is more active and stable than the unmodified one.
Original language | English |
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Pages (from-to) | 5092-5100 |
Number of pages | 9 |
Journal | Applied Surface Science |
Volume | 253 |
Issue number | 11 |
DOIs | |
Publication status | Published - 30 Mar 2007 |
Scopus Subject Areas
- General Chemistry
- Condensed Matter Physics
- General Physics and Astronomy
- Surfaces and Interfaces
- Surfaces, Coatings and Films
User-Defined Keywords
- Carbon deposition
- Derivative XAES
- DTA
- Ga-Mo/ZSM-5 catalyst
- Suppression of coke
- XPS