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- Title
Beneficial effect of adding γ‐AlOOH to the γ‐Al<sub>2</sub>O<sub>3</sub> washcoat of a PdO catalyst for methane oxidation.
- Authors
Almohamadi, Hamad; Smith, Kevin J.
- Abstract
The beneficial effect of adding γ‐AlOOH to the γ‐Al2O3 washcoat of a ceramic cordierite (2MgO · 2Al2O3 · 5SiO2) monolith, used to support a PdO catalyst, is reported for methane oxidation in the presence of water at low temperature (<500°C). The mini‐monolith (400 cells per square inch (CPI), 1 cm diameter × 2.54 cm length; ~52 cells) was washcoated using a suspension of γ‐Al2O3 plus boehmite (γ‐AlOOH), followed by calcination and then deposition of Pd by wet impregnation. An optimum solid content of 25 wt% in the washcoat suspension was used to obtain a ~25 wt% washcoat on the monolith. The presence of γ‐AlOOH enhanced the thermal and mechanical stability of the washcoat, provided that the γ‐AlOOH content was <8 wt%. Temperature‐programmed methane oxidation (TPO) showed that the addition of γ‐AlOOH to the γ‐Al2O3 washcoat decreased the catalyst activity. However, when H2O (2 vol% and 5 vol%) was present in the feed gas, the γ‐AlOOH improved the catalyst activity and stability. A γ‐AlOOH content of ~5 wt% in the washcoat was determined to provide the highest catalyst activity and stability for CH4 oxidation in the presence of water.
- Subjects
METHANE; CATALYST supports; PRECIPITATION (Chemistry); OXIDATION; CATALYSTS; OXIDATION of water
- Publication
Canadian Journal of Chemical Engineering, 2020, Vol 98, Issue 1, p281
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.23605