Formation of the Phase Composition of Crystalline Silica in the Processing of Amorphous Precursors in Super- and Subcritical Water Media
The regularities of the formation of the phase composition of crystalline silica during the processing of amorphous precursors in the aqueous fluid media below and above the critical point of water aimed at the formation of optimal support for the methane oxidative coupling (OCM) catalyst were studi...
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| Veröffentlicht in: | Russian journal of physical chemistry. B 2020-12, Vol.14 (7), p.1090-1097 |
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| container_title | Russian journal of physical chemistry. B |
| container_volume | 14 |
| creator | Sinev, M. Yu Ivakin, Yu. D. Shashkin, D. P. Fattakhova, Z. T. Ponomareva, E. A. Gordienko, Yu. A. Bychkov, V. Yu |
| description | The regularities of the formation of the phase composition of crystalline silica during the processing of amorphous precursors in the aqueous fluid media below and above the critical point of water aimed at the formation of optimal support for the methane oxidative coupling (OCM) catalyst were studied. It was shown that the phase composition of SiO
2
and the rate of phase formation strongly depend on the processing conditions (temperature, time, phase state of the water fluid) and the presence of trace amounts of impurities in the initial amorphous material. Nevertheless, for different precursors, the phase formation occurs, apparently, via the formation of the same bulk-hydrated structures. Optimization of the processing in the water fluid and subsequent heat treatment made it possible to obtain an OCM catalyst that is significantly more efficient than the one obtained by the conventional procedure using an amorphous support. It was concluded that the catalytic properties are entirely determined by chemical and phase transformations occurring in the active component (Na
2
WO
4
–Mn
2
O
3
) on the support surface and do not depend on the doping of the support with the ions composing the active phase. |
| doi_str_mv | 10.1134/S1990793120070167 |
| format | Article |
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2
and the rate of phase formation strongly depend on the processing conditions (temperature, time, phase state of the water fluid) and the presence of trace amounts of impurities in the initial amorphous material. Nevertheless, for different precursors, the phase formation occurs, apparently, via the formation of the same bulk-hydrated structures. Optimization of the processing in the water fluid and subsequent heat treatment made it possible to obtain an OCM catalyst that is significantly more efficient than the one obtained by the conventional procedure using an amorphous support. It was concluded that the catalytic properties are entirely determined by chemical and phase transformations occurring in the active component (Na
2
WO
4
–Mn
2
O
3
) on the support surface and do not depend on the doping of the support with the ions composing the active phase.</description><identifier>ISSN: 1990-7931</identifier><identifier>EISSN: 1990-7923</identifier><identifier>DOI: 10.1134/S1990793120070167</identifier><language>eng</language><publisher>Moscow: Pleiades Publishing</publisher><subject>Amorphous materials ; Catalysts ; Chemistry ; Chemistry and Materials Science ; Critical point ; Crystal structure ; Crystallinity ; Heat treatment ; Optimization ; Phase composition ; Phase transitions ; Physical Chemistry ; Precursors ; Silicon dioxide</subject><ispartof>Russian journal of physical chemistry. B, 2020-12, Vol.14 (7), p.1090-1097</ispartof><rights>Pleiades Publishing, Ltd. 2020. ISSN 1990-7931, Russian Journal of Physical Chemistry B, 2020, Vol. 14, No. 7, pp. 1090–1097. © Pleiades Publishing, Ltd., 2020. Russian Text © The Author(s), 2019, published in Sverkhkriticheskie Flyuidy. Teoriya i Praktika, 2019, Vol. 14, No. 3, pp. 45–55.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c316t-2655c6add20ee48b1250ff0c6aebcb86520e0a9768a6281379c47a4d8d8532eb3</citedby><cites>FETCH-LOGICAL-c316t-2655c6add20ee48b1250ff0c6aebcb86520e0a9768a6281379c47a4d8d8532eb3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1134/S1990793120070167$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1134/S1990793120070167$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Sinev, M. Yu</creatorcontrib><creatorcontrib>Ivakin, Yu. D.</creatorcontrib><creatorcontrib>Shashkin, D. P.</creatorcontrib><creatorcontrib>Fattakhova, Z. T.</creatorcontrib><creatorcontrib>Ponomareva, E. A.</creatorcontrib><creatorcontrib>Gordienko, Yu. A.</creatorcontrib><creatorcontrib>Bychkov, V. Yu</creatorcontrib><title>Formation of the Phase Composition of Crystalline Silica in the Processing of Amorphous Precursors in Super- and Subcritical Water Media</title><title>Russian journal of physical chemistry. B</title><addtitle>Russ. J. Phys. Chem. B</addtitle><description>The regularities of the formation of the phase composition of crystalline silica during the processing of amorphous precursors in the aqueous fluid media below and above the critical point of water aimed at the formation of optimal support for the methane oxidative coupling (OCM) catalyst were studied. It was shown that the phase composition of SiO
2
and the rate of phase formation strongly depend on the processing conditions (temperature, time, phase state of the water fluid) and the presence of trace amounts of impurities in the initial amorphous material. Nevertheless, for different precursors, the phase formation occurs, apparently, via the formation of the same bulk-hydrated structures. Optimization of the processing in the water fluid and subsequent heat treatment made it possible to obtain an OCM catalyst that is significantly more efficient than the one obtained by the conventional procedure using an amorphous support. It was concluded that the catalytic properties are entirely determined by chemical and phase transformations occurring in the active component (Na
2
WO
4
–Mn
2
O
3
) on the support surface and do not depend on the doping of the support with the ions composing the active phase.</description><subject>Amorphous materials</subject><subject>Catalysts</subject><subject>Chemistry</subject><subject>Chemistry and Materials Science</subject><subject>Critical point</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>Heat treatment</subject><subject>Optimization</subject><subject>Phase composition</subject><subject>Phase transitions</subject><subject>Physical Chemistry</subject><subject>Precursors</subject><subject>Silicon dioxide</subject><issn>1990-7931</issn><issn>1990-7923</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp1kM1KxDAUhYMoOI4-gLuA62qStkm6HAZHhRGFUVyWNL2dydA2NWkX8wY-tin1ZyGu7uHc75wLF6FLSq4pjZObDc0yIrKYMkIEoVwcodloRSJj8fGPjukpOvN-TwhnIiMz9LGyrlG9sS22Fe53gJ93ygNe2qaz3nwvlu7ge1XXpgW8MbXRCpt2wp3V4L1ptyO3aKzrdnbwwQc9OG-dH8nN0IGLsGrLIAvtQrFWNX5TPTj8CKVR5-ikUrWHi685R6-r25flfbR-untYLtaRjinvI8bTVHNVlowAJLKgLCVVRYIFhS4kT4NPVCa4VJxJGotMJ0IlpSxlGjMo4jm6mno7Z98H8H2-t4Nrw8mcJZIIKZjggaITpZ313kGVd840yh1ySvLx4fmfh4cMmzI-sO0W3G_z_6FPy-GDbQ</recordid><startdate>20201201</startdate><enddate>20201201</enddate><creator>Sinev, M. Yu</creator><creator>Ivakin, Yu. D.</creator><creator>Shashkin, D. P.</creator><creator>Fattakhova, Z. T.</creator><creator>Ponomareva, E. A.</creator><creator>Gordienko, Yu. A.</creator><creator>Bychkov, V. Yu</creator><general>Pleiades Publishing</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20201201</creationdate><title>Formation of the Phase Composition of Crystalline Silica in the Processing of Amorphous Precursors in Super- and Subcritical Water Media</title><author>Sinev, M. Yu ; Ivakin, Yu. D. ; Shashkin, D. P. ; Fattakhova, Z. T. ; Ponomareva, E. A. ; Gordienko, Yu. A. ; Bychkov, V. Yu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c316t-2655c6add20ee48b1250ff0c6aebcb86520e0a9768a6281379c47a4d8d8532eb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Amorphous materials</topic><topic>Catalysts</topic><topic>Chemistry</topic><topic>Chemistry and Materials Science</topic><topic>Critical point</topic><topic>Crystal structure</topic><topic>Crystallinity</topic><topic>Heat treatment</topic><topic>Optimization</topic><topic>Phase composition</topic><topic>Phase transitions</topic><topic>Physical Chemistry</topic><topic>Precursors</topic><topic>Silicon dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sinev, M. Yu</creatorcontrib><creatorcontrib>Ivakin, Yu. D.</creatorcontrib><creatorcontrib>Shashkin, D. P.</creatorcontrib><creatorcontrib>Fattakhova, Z. T.</creatorcontrib><creatorcontrib>Ponomareva, E. A.</creatorcontrib><creatorcontrib>Gordienko, Yu. A.</creatorcontrib><creatorcontrib>Bychkov, V. Yu</creatorcontrib><collection>CrossRef</collection><jtitle>Russian journal of physical chemistry. B</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sinev, M. Yu</au><au>Ivakin, Yu. D.</au><au>Shashkin, D. P.</au><au>Fattakhova, Z. T.</au><au>Ponomareva, E. A.</au><au>Gordienko, Yu. A.</au><au>Bychkov, V. Yu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Formation of the Phase Composition of Crystalline Silica in the Processing of Amorphous Precursors in Super- and Subcritical Water Media</atitle><jtitle>Russian journal of physical chemistry. B</jtitle><stitle>Russ. J. Phys. Chem. B</stitle><date>2020-12-01</date><risdate>2020</risdate><volume>14</volume><issue>7</issue><spage>1090</spage><epage>1097</epage><pages>1090-1097</pages><issn>1990-7931</issn><eissn>1990-7923</eissn><abstract>The regularities of the formation of the phase composition of crystalline silica during the processing of amorphous precursors in the aqueous fluid media below and above the critical point of water aimed at the formation of optimal support for the methane oxidative coupling (OCM) catalyst were studied. It was shown that the phase composition of SiO
2
and the rate of phase formation strongly depend on the processing conditions (temperature, time, phase state of the water fluid) and the presence of trace amounts of impurities in the initial amorphous material. Nevertheless, for different precursors, the phase formation occurs, apparently, via the formation of the same bulk-hydrated structures. Optimization of the processing in the water fluid and subsequent heat treatment made it possible to obtain an OCM catalyst that is significantly more efficient than the one obtained by the conventional procedure using an amorphous support. It was concluded that the catalytic properties are entirely determined by chemical and phase transformations occurring in the active component (Na
2
WO
4
–Mn
2
O
3
) on the support surface and do not depend on the doping of the support with the ions composing the active phase.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S1990793120070167</doi><tpages>8</tpages></addata></record> |
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| identifier | ISSN: 1990-7931 |
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| issn | 1990-7931 1990-7923 |
| language | eng |
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| subjects | Amorphous materials Catalysts Chemistry Chemistry and Materials Science Critical point Crystal structure Crystallinity Heat treatment Optimization Phase composition Phase transitions Physical Chemistry Precursors Silicon dioxide |
| title | Formation of the Phase Composition of Crystalline Silica in the Processing of Amorphous Precursors in Super- and Subcritical Water Media |
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