Effect of Pt Addition on Sulfur Dioxide and Water Vapor Tolerance of Pd-Mn-Hexaaluminate Catalysts for High-Temperature Oxidation of Methane Full article
| Journal |
Applied Catalysis B: Environmental
ISSN: 0926-3373 , E-ISSN: 1873-3883 |
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| Output data | Year: 2017, Volume: 204, Pages: 89-106 Pages count : 18 DOI: 10.1016/j.apcatb.2016.11.018 | ||||||
| Tags | Methane oxidation, Mn-hexaaluminate, Pd-catalyst, Pt-catalyst, Sulfur-resistance | ||||||
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| Affiliations |
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Funding (1)
| 1 | Russian Foundation for Basic Research | 15-03-05459 |
Abstract:
An effect of Pt addition to improve the catalytic performance of Pd-modified Mn-hexaaluminate in the high-temperature oxidation of methane, especially in SO2 and water presence, has been studied. X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry and differential thermal analysis were used for the characterization of fresh and spent catalysts. Temperature-programmed reduction by hydrogen was employed to study the redox properties of the catalysts. Four high-temperature tests (at 670 ◦C) of the methane oxidation were applied to reveal the water and sulfur resistance ofthe catalysts: 1) dry methane-air feed;
2) wet methane-air feed containing 3 wt% of water vapor; 3) methane-air feed containing 1000 ppm of SO2; and 4) wet methane-air feed with 1000 ppm of SO2. The Pt-doped Pd-Mn-hexaaluminate catalyst with the atomic ratio of
Pt/Pd < 0.3 has been shown to possess the highest catalytic activity in the oxidation of methane, high water and
sulfur tolerance, and reducibility by hydrogen as compared to the monometallic Pd-Mn-hexaaluminate catalyst and the bimetallic catalysts with Pt/Pd > 0.5. From the formal kinetic data of the oxidation of methane on the fresh and deactivated catalysts, we assumed that deactivation of the catalysts is due to a decrease in the amount of catalytically active sites in the bimetallic 0.33Pt-0.67Pd(0.27)/MnLaAl11O19 catalyst and a change in the state of active component in the other catalysts. Their oxidation ability and redox behavior were shown to be associated with the highly dispersed PdO particles, a PdO layer (3–5 nm) covering the metal palladium particles as well as the Mn3+-enriched MnLaAl11O19. The improved water and sulfur resistance is found to correlate with the presence of particles of PtPd alloy, with its fraction not exceeding 50%.
Cite:
Yashnik S.A.
, Chesalov Y.A.
, Ishchenko A.V.
, Kaichev V.V.
, Ismagilov Z.R.
Effect of Pt Addition on Sulfur Dioxide and Water Vapor Tolerance of Pd-Mn-Hexaaluminate Catalysts for High-Temperature Oxidation of Methane
Applied Catalysis B: Environmental. 2017. V.204. P.89-106. DOI: 10.1016/j.apcatb.2016.11.018 WOS Scopus РИНЦ ANCAN OpenAlex
Effect of Pt Addition on Sulfur Dioxide and Water Vapor Tolerance of Pd-Mn-Hexaaluminate Catalysts for High-Temperature Oxidation of Methane
Applied Catalysis B: Environmental. 2017. V.204. P.89-106. DOI: 10.1016/j.apcatb.2016.11.018 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jun 10, 2016 |
| Accepted: | Nov 10, 2016 |
| Published online: | Nov 11, 2016 |
| Published print: | May 1, 2017 |
Identifiers:
| Web of science: | WOS:000392681000010 |
| Scopus: | 2-s2.0-84997235763 |
| Elibrary: | 29465688 |
| Chemical Abstracts: | 2016:1902348 |
| Chemical Abstracts (print): | 166:248319 |
| OpenAlex: | W2553962592 |