The Relation between Nature and Stability of H2‐Dissociating Sites and Propene Selectivity in Silica‐Supported (Ga,Al)2O3 Mixed Oxide Propane Dehydrogenation Catalysts Научная публикация
Журнал |
Helvetica Chimica Acta
ISSN: 1522-2675 , E-ISSN: 0018-019X |
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Вых. Данные | Год: 2024, Том: 107, Номер: 8, Номер статьи : e202400076, Страниц : DOI: 10.1002/hlca.202400076 | ||||||||
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Реферат:
Colloidal solutions of gallia-alumina (Ga,Al)2O3(x:y) solid-solution nanoparticles with nominal atomic Ga : Al (x:y) ratios of 1 : 6, 1 : 3, 3 : 1, and 1:0 were used to prepare silica-supported catalysts for propane dehydrogenation (PDH). A comparison of the unsupported and silica-supported catalysts reveals that the dispersion on silica increases the Ga-normalized PDH rates for all catalysts, albeit with a notably lower propene selectivity for (Ga,Al)2O3(1:6)/SiO2. Fourier transform infrared (FTIR) spectroscopy allows contrasting the H2 dissociation sites in the calcined and H2-treated (Ga,Al)2O3(x:y)/SiO2, indicating a transformation of Ga3+ surface sites with Al (mainly) and Ga atoms in the second coordination sphere (Ga(Al/Ga) sites) in the calcined (Ga,Al)2O3(1:6)/SiO2 to predominantly Ga(Ga/Si) surface sites in the H2-treated material. The resulting sites are similarly unselective as in amorphous gallia on silica. H2 produced during the PDH reaction can cause a similar transformation as H2 pretreatment in (Ga,Al)2O3(1:6)/SiO2, rapidly resulting in a notably lowered selectivity. The stable and selective Ga(Al/Ga) surface sites in (Ga,Al)2O3(1:3)/SiO2 yield a Ga−H band at ca. 1990 cm−1 under H2 dissociation conditions while the less selective surface sites, observed for the other Ga : Al ratios, give Ga−H bands at ca. 2040 and 2060 cm−1.
Библиографическая ссылка:
Castro-Fernández P.
, Serykh A.I.
, Yarar M.
, Mance D.
, Abdala P.M.
, Copéret C.
, Fedorov A.
, Müller C.R.
The Relation between Nature and Stability of H2‐Dissociating Sites and Propene Selectivity in Silica‐Supported (Ga,Al)2O3 Mixed Oxide Propane Dehydrogenation Catalysts
Helvetica Chimica Acta. 2024. V.107. N8. e202400076 . DOI: 10.1002/hlca.202400076 OpenAlex
The Relation between Nature and Stability of H2‐Dissociating Sites and Propene Selectivity in Silica‐Supported (Ga,Al)2O3 Mixed Oxide Propane Dehydrogenation Catalysts
Helvetica Chimica Acta. 2024. V.107. N8. e202400076 . DOI: 10.1002/hlca.202400076 OpenAlex
Идентификаторы БД:
OpenAlex: | W4399764962 |
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