Ag Size/Structure-Dependent Effect on Low-Temperature Selective Catalytic Oxidation of NH3 over Ag/MnO2

Ag Size/Structure-Dependent Effect on Low-Temperature Selective Catalytic Oxidation of NH3 over Ag/MnO2

Selective catalytic oxidation of ammonia (NH3-SCO) into N2 and H2O is considered to be a promising technique to eliminate NH3 pollution. Various Ag/MnO2 catalysts were prepared and applied to low-temperature (especially

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Veröffentlicht in:ACS catalysis 2021-07, Vol.11 (14), p.8576-8584
Hauptverfasser: Wang, Haifeng, Lin, Mingyue, Murayama, Toru, Feng, Shixiang, Haruta, Masatake, Miura, Hiroki, Shishido, Tetsuya
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container_end_page 8584
container_issue 14
container_start_page 8576
container_title ACS catalysis
container_volume 11
creator Wang, Haifeng
Lin, Mingyue
Murayama, Toru
Feng, Shixiang
Haruta, Masatake
Miura, Hiroki
Shishido, Tetsuya
description Selective catalytic oxidation of ammonia (NH3-SCO) into N2 and H2O is considered to be a promising technique to eliminate NH3 pollution. Various Ag/MnO2 catalysts were prepared and applied to low-temperature (especially
doi_str_mv 10.1021/acscatal.1c01130
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Various Ag/MnO2 catalysts were prepared and applied to low-temperature (especially &lt;100 °C) NH3-SCO. The Ag/MnO2-X (X indicating the calcination temperature) catalyst had a variable Ag size and structure depending on the calcination temperature from 200 to 500 °C. The Ag/MnO2-400 catalyst showed 10% NH3 conversion at 35 °C, and the temperature was 90 °C for the complete removal of 50 ppm NH3. More importantly, the N2 selectivities of NH3-SCO over Ag/MnO2-400 at the temperatures ranging from 30 to 120 °C were higher than 96%. Turnover frequencies of NH3 oxidation, N2 selectivity, and byproducts depended on the Ag size/structure. Ag/MnO2-400 with Ag particles of 2.4 nm diameter had the highest density of Ag particles over rod-shaped MnO2 during the reaction, which would be favorable for the formation of adsorbed NO and NH2NO intermediates to form N2 and H2O.</description><identifier>ISSN: 2155-5435</identifier><identifier>EISSN: 2155-5435</identifier><identifier>DOI: 10.1021/acscatal.1c01130</identifier><language>eng ; jpn</language><publisher>American Chemical Society</publisher><ispartof>ACS catalysis, 2021-07, Vol.11 (14), p.8576-8584</ispartof><rights>2021 American Chemical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000-0001-5105-3290 ; 0000-0002-2488-4432 ; 0000-0002-8475-4226</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/acscatal.1c01130$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/acscatal.1c01130$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,27076,27924,27925,56738,56788</link.rule.ids></links><search><creatorcontrib>Wang, Haifeng</creatorcontrib><creatorcontrib>Lin, Mingyue</creatorcontrib><creatorcontrib>Murayama, Toru</creatorcontrib><creatorcontrib>Feng, Shixiang</creatorcontrib><creatorcontrib>Haruta, Masatake</creatorcontrib><creatorcontrib>Miura, Hiroki</creatorcontrib><creatorcontrib>Shishido, Tetsuya</creatorcontrib><title>Ag Size/Structure-Dependent Effect on Low-Temperature Selective Catalytic Oxidation of NH3 over Ag/MnO2</title><title>ACS catalysis</title><addtitle>ACS Catal</addtitle><description>Selective catalytic oxidation of ammonia (NH3-SCO) into N2 and H2O is considered to be a promising technique to eliminate NH3 pollution. 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