Iron-exchanged UZM-35: An active NH3-SCR catalyst at low temperatures
[Display omitted] •Fresh Fe-UZM-35 shows significantly higher low-temperature NH3-SCR activity than fresh Fe-beta.•When hydrothermally aged at 1173 K, however, the opposite result was observed.•Iron species in fresh Fe-UZM-35 are mostly present as isolated Fe3+ ions.•Zeolite framework topology is ke...
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| Veröffentlicht in: | Applied catalysis. B, Environmental Environmental, 2020-06, Vol.266, p.118622, Article 118622 |
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| container_title | Applied catalysis. B, Environmental |
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| creator | Ryu, Taekyung Hong, Suk Bong |
| description | [Display omitted]
•Fresh Fe-UZM-35 shows significantly higher low-temperature NH3-SCR activity than fresh Fe-beta.•When hydrothermally aged at 1173 K, however, the opposite result was observed.•Iron species in fresh Fe-UZM-35 are mostly present as isolated Fe3+ ions.•Zeolite framework topology is key to the hydrothermal stability of supported Fe catalysts.
The catalytic properties of iron-exchanged UZM-35, beta, LTA, and SSZ-13 zeolites with similar Si/Al and Fe/Al ratios (8.9–12 and 0.35-0.37, respectively) and their hydrothermally aged forms at 1023−1173 K are compared in NH3-SCR. When fresh, the low-temperature (< 573 K) activity of Fe-UZM-35 is considerably better than the other three iron-exchanged zeolite catalysts. Unlike those in fresh Fe-beta, Fe-LTA, and Fe-SSZ-13, the iron species in fresh Fe-UZM-35 were found to be mainly present as isolated extraframework Fe3+ ions which may be responsible for the high low-temperature SCR activity. However, while hydrothermal aging at 1173 K led to a notable decrease in activity of all zeolite-supported iron catalysts, the extent of activity decrease differs according to the structure type of zeolite supports. The overall results of this study strongly suggest that zeolite framework topology is a key factor governing the activity and durability of zeolite-supported iron catalysts for NH3-SCR. |
| doi_str_mv | 10.1016/j.apcatb.2020.118622 |
| format | Article |
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•Fresh Fe-UZM-35 shows significantly higher low-temperature NH3-SCR activity than fresh Fe-beta.•When hydrothermally aged at 1173 K, however, the opposite result was observed.•Iron species in fresh Fe-UZM-35 are mostly present as isolated Fe3+ ions.•Zeolite framework topology is key to the hydrothermal stability of supported Fe catalysts.
The catalytic properties of iron-exchanged UZM-35, beta, LTA, and SSZ-13 zeolites with similar Si/Al and Fe/Al ratios (8.9–12 and 0.35-0.37, respectively) and their hydrothermally aged forms at 1023−1173 K are compared in NH3-SCR. When fresh, the low-temperature (< 573 K) activity of Fe-UZM-35 is considerably better than the other three iron-exchanged zeolite catalysts. Unlike those in fresh Fe-beta, Fe-LTA, and Fe-SSZ-13, the iron species in fresh Fe-UZM-35 were found to be mainly present as isolated extraframework Fe3+ ions which may be responsible for the high low-temperature SCR activity. However, while hydrothermal aging at 1173 K led to a notable decrease in activity of all zeolite-supported iron catalysts, the extent of activity decrease differs according to the structure type of zeolite supports. The overall results of this study strongly suggest that zeolite framework topology is a key factor governing the activity and durability of zeolite-supported iron catalysts for NH3-SCR.</description><identifier>ISSN: 0926-3373</identifier><identifier>EISSN: 1873-3883</identifier><identifier>DOI: 10.1016/j.apcatb.2020.118622</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Aging ; Aluminum ; Ammonia ; Catalysts ; Durability ; Fe-UZM-35 ; Hydrothermal stability ; Iron ; Low temperature ; Low-temperature activity ; NH3-SCR ; Selective catalytic reduction ; Silicon ; Topology ; Zeolite framework topology ; Zeolites</subject><ispartof>Applied catalysis. B, Environmental, 2020-06, Vol.266, p.118622, Article 118622</ispartof><rights>2020 Elsevier B.V.</rights><rights>Copyright Elsevier BV Jun 5, 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c334t-5ea277b13b04376f3b4482fcc8c30aa269a23bed14e1d0546add19485eceecbe3</citedby><cites>FETCH-LOGICAL-c334t-5ea277b13b04376f3b4482fcc8c30aa269a23bed14e1d0546add19485eceecbe3</cites><orcidid>0000-0002-2855-1600</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0926337320300370$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Ryu, Taekyung</creatorcontrib><creatorcontrib>Hong, Suk Bong</creatorcontrib><title>Iron-exchanged UZM-35: An active NH3-SCR catalyst at low temperatures</title><title>Applied catalysis. B, Environmental</title><description>[Display omitted]
•Fresh Fe-UZM-35 shows significantly higher low-temperature NH3-SCR activity than fresh Fe-beta.•When hydrothermally aged at 1173 K, however, the opposite result was observed.•Iron species in fresh Fe-UZM-35 are mostly present as isolated Fe3+ ions.•Zeolite framework topology is key to the hydrothermal stability of supported Fe catalysts.
The catalytic properties of iron-exchanged UZM-35, beta, LTA, and SSZ-13 zeolites with similar Si/Al and Fe/Al ratios (8.9–12 and 0.35-0.37, respectively) and their hydrothermally aged forms at 1023−1173 K are compared in NH3-SCR. When fresh, the low-temperature (< 573 K) activity of Fe-UZM-35 is considerably better than the other three iron-exchanged zeolite catalysts. Unlike those in fresh Fe-beta, Fe-LTA, and Fe-SSZ-13, the iron species in fresh Fe-UZM-35 were found to be mainly present as isolated extraframework Fe3+ ions which may be responsible for the high low-temperature SCR activity. However, while hydrothermal aging at 1173 K led to a notable decrease in activity of all zeolite-supported iron catalysts, the extent of activity decrease differs according to the structure type of zeolite supports. The overall results of this study strongly suggest that zeolite framework topology is a key factor governing the activity and durability of zeolite-supported iron catalysts for NH3-SCR.</description><subject>Aging</subject><subject>Aluminum</subject><subject>Ammonia</subject><subject>Catalysts</subject><subject>Durability</subject><subject>Fe-UZM-35</subject><subject>Hydrothermal stability</subject><subject>Iron</subject><subject>Low temperature</subject><subject>Low-temperature activity</subject><subject>NH3-SCR</subject><subject>Selective catalytic reduction</subject><subject>Silicon</subject><subject>Topology</subject><subject>Zeolite framework topology</subject><subject>Zeolites</subject><issn>0926-3373</issn><issn>1873-3883</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LwzAYxoMoOKffwEPBc2aSN21TD8IY6gZTQd3FS0jTt9qytTXJpvv2dtSzpxcenj-8P0IuOZtwxpPremI6a0I-EUz0EleJEEdkxFUKFJSCYzJimUgoQAqn5Mz7mjEmQKgRuVu4tqH4Yz9N84FFtHp_pBDfRNMmMjZUO4ye5kBfZy9RP2DWex8iE6J1-x0F3HToTNg69OfkpDRrjxd_d0xW93dvszldPj8sZtMltQAy0BiNSNOcQ84kpEkJuZRKlNYqC8wYkWRGQI4Fl8gLFsvEFAXPpIrRItocYUyuht7OtV9b9EHX7dY1_aQWkKosAyVU75KDy7rWe4el7ly1MW6vOdMHYLrWAzB9AKYHYH3sdohh_8GuQqe9rbCxWFQObdBFW_1f8Av2EHPB</recordid><startdate>20200605</startdate><enddate>20200605</enddate><creator>Ryu, Taekyung</creator><creator>Hong, Suk Bong</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7ST</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope><scope>L7M</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0002-2855-1600</orcidid></search><sort><creationdate>20200605</creationdate><title>Iron-exchanged UZM-35: An active NH3-SCR catalyst at low temperatures</title><author>Ryu, Taekyung ; Hong, Suk Bong</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c334t-5ea277b13b04376f3b4482fcc8c30aa269a23bed14e1d0546add19485eceecbe3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Aging</topic><topic>Aluminum</topic><topic>Ammonia</topic><topic>Catalysts</topic><topic>Durability</topic><topic>Fe-UZM-35</topic><topic>Hydrothermal stability</topic><topic>Iron</topic><topic>Low temperature</topic><topic>Low-temperature activity</topic><topic>NH3-SCR</topic><topic>Selective catalytic reduction</topic><topic>Silicon</topic><topic>Topology</topic><topic>Zeolite framework topology</topic><topic>Zeolites</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ryu, Taekyung</creatorcontrib><creatorcontrib>Hong, Suk Bong</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Environment Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Applied catalysis. B, Environmental</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ryu, Taekyung</au><au>Hong, Suk Bong</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Iron-exchanged UZM-35: An active NH3-SCR catalyst at low temperatures</atitle><jtitle>Applied catalysis. B, Environmental</jtitle><date>2020-06-05</date><risdate>2020</risdate><volume>266</volume><spage>118622</spage><pages>118622-</pages><artnum>118622</artnum><issn>0926-3373</issn><eissn>1873-3883</eissn><abstract>[Display omitted]
•Fresh Fe-UZM-35 shows significantly higher low-temperature NH3-SCR activity than fresh Fe-beta.•When hydrothermally aged at 1173 K, however, the opposite result was observed.•Iron species in fresh Fe-UZM-35 are mostly present as isolated Fe3+ ions.•Zeolite framework topology is key to the hydrothermal stability of supported Fe catalysts.
The catalytic properties of iron-exchanged UZM-35, beta, LTA, and SSZ-13 zeolites with similar Si/Al and Fe/Al ratios (8.9–12 and 0.35-0.37, respectively) and their hydrothermally aged forms at 1023−1173 K are compared in NH3-SCR. When fresh, the low-temperature (< 573 K) activity of Fe-UZM-35 is considerably better than the other three iron-exchanged zeolite catalysts. Unlike those in fresh Fe-beta, Fe-LTA, and Fe-SSZ-13, the iron species in fresh Fe-UZM-35 were found to be mainly present as isolated extraframework Fe3+ ions which may be responsible for the high low-temperature SCR activity. However, while hydrothermal aging at 1173 K led to a notable decrease in activity of all zeolite-supported iron catalysts, the extent of activity decrease differs according to the structure type of zeolite supports. The overall results of this study strongly suggest that zeolite framework topology is a key factor governing the activity and durability of zeolite-supported iron catalysts for NH3-SCR.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.apcatb.2020.118622</doi><orcidid>https://orcid.org/0000-0002-2855-1600</orcidid></addata></record> |
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| subjects | Aging Aluminum Ammonia Catalysts Durability Fe-UZM-35 Hydrothermal stability Iron Low temperature Low-temperature activity NH3-SCR Selective catalytic reduction Silicon Topology Zeolite framework topology Zeolites |
| title | Iron-exchanged UZM-35: An active NH3-SCR catalyst at low temperatures |
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