Preparation method and structure of active sites of FeOx/ SiO2 catalysts in methane to formaldehyde selective oxidation

F. Arena; G. Gatti; S. Coluccia; G. Martra; A. Parmaliana

doi:10.1016/j.cattod.2004.03.049

Preparation method and structure of active sites of FeO_x/ SiO₂ catalysts in methane to formaldehyde selective oxidation

F. Arena, G. Gatti, S. Coluccia, G. Martra, A. Parmaliana

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

The effects of preparation method on surface structures and catalytic properties in the selective oxidation of CH₄ to HCHO with O ₂ (MPO) of low-loaded (0.09-0.43wt.% Fe) FeO_x/SiO ₂ catalysts have been addressed. The DR-UV-Vis patterns prove that the preparation route, based on "adsorption-precipitation" of Fe ^II precursors on silica under anaerobic conditions (ADS/PRC), enhances the dispersion of the active phase in comparison to the conventional "incipient-wetness" route. FTIR of adsorbed NO data signal the presence on silica of several "isolated" Fe moieties with a different surface coordination. A higher FeO_x dispersion confers a superior performance to ADS/PRC FeO_x/SiO₂ catalysts in terms of specific rate of CH₄ conversion (σ_CH4) and HCHO formation (ε_HCHO) of Fe atoms which result in quite larger HCHO productivity values (STY_HCHO).

Lingua originale	Inglese
pagine (da-a)	305-309
Numero di pagine	5
Rivista	Catalysis Today
Volume	91-92
DOI	https://doi.org/10.1016/j.cattod.2004.03.049
Stato di pubblicazione	Pubblicato - 15 lug 2004
Pubblicato esternamente	Sì

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10.1016/j.cattod.2004.03.049

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title = "Preparation method and structure of active sites of FeOx/ SiO2 catalysts in methane to formaldehyde selective oxidation",

abstract = "The effects of preparation method on surface structures and catalytic properties in the selective oxidation of CH4 to HCHO with O 2 (MPO) of low-loaded (0.09-0.43wt.\% Fe) FeOx/SiO 2 catalysts have been addressed. The DR-UV-Vis patterns prove that the preparation route, based on {"}adsorption-precipitation{"} of Fe II precursors on silica under anaerobic conditions (ADS/PRC), enhances the dispersion of the active phase in comparison to the conventional {"}incipient-wetness{"} route. FTIR of adsorbed NO data signal the presence on silica of several {"}isolated{"} Fe moieties with a different surface coordination. A higher FeOx dispersion confers a superior performance to ADS/PRC FeOx/SiO2 catalysts in terms of specific rate of CH4 conversion (σCH4) and HCHO formation (εHCHO) of Fe atoms which result in quite larger HCHO productivity values (STYHCHO).",

keywords = "Fe precursor, FeO/SiO catalyst, Selective oxidation",

author = "F. Arena and G. Gatti and S. Coluccia and G. Martra and A. Parmaliana",

year = "2004",

month = jul,

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doi = "10.1016/j.cattod.2004.03.049",

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journal = "Catalysis Today",

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TY - JOUR

T1 - Preparation method and structure of active sites of FeOx/ SiO2 catalysts in methane to formaldehyde selective oxidation

AU - Arena, F.

AU - Gatti, G.

AU - Coluccia, S.

AU - Martra, G.

AU - Parmaliana, A.

PY - 2004/7/15

Y1 - 2004/7/15

N2 - The effects of preparation method on surface structures and catalytic properties in the selective oxidation of CH4 to HCHO with O 2 (MPO) of low-loaded (0.09-0.43wt.% Fe) FeOx/SiO 2 catalysts have been addressed. The DR-UV-Vis patterns prove that the preparation route, based on "adsorption-precipitation" of Fe II precursors on silica under anaerobic conditions (ADS/PRC), enhances the dispersion of the active phase in comparison to the conventional "incipient-wetness" route. FTIR of adsorbed NO data signal the presence on silica of several "isolated" Fe moieties with a different surface coordination. A higher FeOx dispersion confers a superior performance to ADS/PRC FeOx/SiO2 catalysts in terms of specific rate of CH4 conversion (σCH4) and HCHO formation (εHCHO) of Fe atoms which result in quite larger HCHO productivity values (STYHCHO).

AB - The effects of preparation method on surface structures and catalytic properties in the selective oxidation of CH4 to HCHO with O 2 (MPO) of low-loaded (0.09-0.43wt.% Fe) FeOx/SiO 2 catalysts have been addressed. The DR-UV-Vis patterns prove that the preparation route, based on "adsorption-precipitation" of Fe II precursors on silica under anaerobic conditions (ADS/PRC), enhances the dispersion of the active phase in comparison to the conventional "incipient-wetness" route. FTIR of adsorbed NO data signal the presence on silica of several "isolated" Fe moieties with a different surface coordination. A higher FeOx dispersion confers a superior performance to ADS/PRC FeOx/SiO2 catalysts in terms of specific rate of CH4 conversion (σCH4) and HCHO formation (εHCHO) of Fe atoms which result in quite larger HCHO productivity values (STYHCHO).

KW - Fe precursor

KW - FeO/SiO catalyst

KW - Selective oxidation

UR - https://www.scopus.com/pages/publications/2942650812

U2 - 10.1016/j.cattod.2004.03.049

DO - 10.1016/j.cattod.2004.03.049

M3 - Article

SN - 0920-5861

VL - 91-92

SP - 305

EP - 309

JO - Catalysis Today

JF - Catalysis Today