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CO Oxidation Effici...
CO Oxidation Efficiency and Hysteresis Behavior over Mesoporous Pd/SiO2 Catalyst
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- Al Soubaihi, Rola Mohammad (author)
- KTH,Tillämpad fysik
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- Saoud, Khaled Mohammad (author)
- Virginia Commonwealth Univ Qatar, Liberal Arts & Sci Program, Doha, Qatar.
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- Myint, Myo Tay Zar (author)
- Sultan Qaboos Univ, Coll Sci, Dept Phys, POB 36, Muscat 123, Oman.
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- Göthelid, Mats A. (author)
- KTH,Material- och nanofysik
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- Dutta, Joydeep, Professor, 1964- (author)
- KTH,Material- och nanofysik
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(creator_code:org_t)
- 2021-01-16
- 2021
- English.
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In: Catalysts. - : MDPI AG. - 2073-4344. ; 11:1
- Related links:
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https://doi.org/10.3...
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https://www.mdpi.com...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Carbon monoxide (CO) oxidation is considered an important reaction in heterogeneous industrial catalysis and has been extensively studied. Pd supported on SiO2 aerogel catalysts exhibit good catalytic activity toward this reaction owing to their CO bond activation capability and thermal stability. Pd/SiO2 catalysts were investigated using carbon monoxide (CO) oxidation as a model reaction. The catalyst becomes active, and the conversion increases after the temperature reaches the ignition temperature (T-ig). A normal hysteresis in carbon monoxide (CO) oxidation has been observed, where the catalysts continue to exhibit high catalytic activity (CO conversion remains at 100%) during the extinction even at temperatures lower than T-ig. The catalyst was characterized using BET, TEM, XPS, TGA-DSC, and FTIR. In this work, the influence of pretreatment conditions and stability of the active sites on the catalytic activity and hysteresis is presented. The CO oxidation on the Pd/SiO2 catalyst has been attributed to the dissociative adsorption of molecular oxygen and the activation of the C-O bond, followed by diffusion of adsorbates at T-ig to form CO2. Whereas, the hysteresis has been explained by the enhanced stability of the active site caused by thermal effects, pretreatment conditions, Pd-SiO2 support interaction, and PdO formation and decomposition.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
Keyword
- CO oxidation
- hysteresis
- thermal stability
- pretreatment
- structure-activity
Publication and Content Type
- ref (subject category)
- art (subject category)
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