Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 280, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119445
Keywords
Oxygen vacancy; Auto-regeneration; CeO2-ZrO2 solid solution; Dry reforming; Syngas
Funding
- Deanship of Scientific Research, King Saud University [RG-1435-078]
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This study demonstrated the potential of using a Ni-Ce/W-Zr catalyst to generate abundant oxygen vacancies through thermal aging, suppressing coke formation and sintering of metallic species, thus exhibiting remarkable activity and stability.
Coking is the major bottleneck in the development of stable catalysts in thermal catalysis. Oxygen vacancies (V-o) play a vital role in realizing the in situ gasification of carbon deposits and the activation of reacting gases, thus leading to the stable activity. Ceria is a potential candidate that provides plentiful V-o, however, V-o annihilated as a result of thermal aging. In this study, by using a novel Ni-Ce/W-Zr catalyst, thermal aging turned as a 'blessing in disguise', because a tremendous amount of V-o was sequentially generated following the thermal aging. The findings were substantiated by TEM, XRD, BET, XPS, Raman spectroscopy, TGA, TPO, TPR and CO2-TPD. In the early stages, CeO2 and ZrO2 formed the solid solution, supplying the oxygen vacancies. Subsequently, Ce-2(WO4)(3) comes into play as a result of thermal aging and furnish the abundant oxygen vacancies. Thus, the sequential generation of oxygen vacancies suppressed the coke formation on one hand, whereas tangibly controlled the sintering of metallic species on the other hand. Consequently, Ni-Ce/W-Zr catalyst demonstrated the remarkable activity and outstanding stability (100 h).
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