Opposite effect of Al on the performances of MoO3/SiO2-Al2O3 catalysts in the metathesis and in the partial oxidation of propene

Debecker, Damien P.; Hauwaert, Damien; Stoyanova, Mariana; Barkschat, Axel; Rodemerck, Uwe; Gaigneaux, Éric M.

doi:10.1016/j.apcata.2010.06.021

Cited by 47 publications

(30 citation statements)

References 49 publications

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“…The ternary catalysts with high alumina content (NH_65_10 and NH_80_10) as well as the binary samples (NH_90_10 and NH_0_10) showed low activities and relatively fast deactivation, in agreement with previous observations. 4 The ternary catalysts with intermediate alumina content (from 5 to 45 wt%) were more active, the best catalyst being the one with only 5 wt% of Al 2 O 3 . The activity of the NH_5_X samples increased with the MoO 3 charge.…”

Section: Metathesis Activitymentioning

confidence: 93%

A non-hydrolytic sol–gel route to highly active MoO3–SiO2–Al2O3 metathesis catalysts

Debecker

Bouchmella

Stoyanova

et al. 2012

Catal. Sci. Technol.

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MoO3-based materials are known to be appropriate catalysts for the heterogeneous metathesis of light olefins. Classical preparation methods involve the deposition of a Mo oxide phase on the surface of preformed support via impregnation, grafting or thermal spreading. An alternative sol-gel approach for the elaboration of Mo-based catalysts is presented in this article. Mesoporous ternary Si-Al-Mo mixed oxides are prepared in one step, via non-hydrolytic condensation of chloride precursors in non-aqueous media. After calcination, effective catalysts with very good textures and highly dispersed surface molybdenum species are obtained. The Si/Al ratio influences both the texture and the acidity of the materials, which significantly affects the propene self-metathesis activity. The activity also increases with the MoO3 content. The best catalysts with optimized composition significantly outperform the catalysts prepared by other methods.

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Section: Metathesis Activitymentioning

confidence: 93%

A non-hydrolytic sol–gel route to highly active MoO3–SiO2–Al2O3 metathesis catalysts

Debecker

Bouchmella

Stoyanova

et al. 2012

Catal. Sci. Technol.

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“…There are many works in the literature related to the ethanol dehydration reaction over solid acid catalysts such as -alumina, zeolite, and silicaalumina [9,10]. There are also research articles directed at obtaining molybdenum oxide over solid acid catalysts in various reactions, which require acid site for active site such as MoO 3 /Al 2 O 3 -SiO 2 in light olefin metathesis or partial oxidation [11,12] and MoO 3 /Al 2 O 3 in hydrodesulfurization of thiophene [13]. However, there are only a few works focused on molybdenum oxide for ethanol dehydration reaction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo-Doped Mesoporous Al-SSP Catalysts for the Catalytic Dehydration of Ethanol to Ethylene

Chanchuey

Autthanit

Jongsomjit

2016

Journal of Chemistry

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The catalytic dehydration of ethanol to ethylene over the mesoporous Al-SSP and Mo-doped Al-SSP catalysts was investigated. The Al-SSP catalyst was first synthesized by the modified sol-gel method and then doped with Mo by impregnation to obtain 1% Mo/Al-SSP and 5% Mo/Al-SSP catalysts (1 and 5 wt% of Mo). The final catalysts were characterized using various techniques such as XRD, N2physisorption, SEM/EDX, TEM, and NH3-TPD. The catalytic activity for all catalysts in gas-phase ethanol dehydration reaction was determined at temperature range of 200°C to 400°C. It was found that the most crucial factor influencing the catalytic activities appears to be the acidity. The acid property of catalysts depended on the amount of Mo loading. Increased Mo loading in Al-SSP resulted in increased weak acid sites, which enhanced the catalytic activity. Besides acidity, the high concentration of Al at surface of catalyst is also essential to obtain high activity. Based on the results, the most suitable catalyst in this study is 1% Mo/Al-SSP catalyst, which can produce ethylene yield of ca. 90% at 300°C with slight amounts of diethyl ether (DEE) and acetaldehyde.

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“…Os catalisadores são, principalmente, preparados através da impregnação de Mo em suportes de sílica, alumina, titânio e sílica-alumínio. 118,119 Foi observado, com base em trabalhos experimentais e estudos teóricos, que para que o catalisador seja ativo é necessário que o suporte tenha acidez e que as espécies de MoOx estejam altamente dispersas.…”

Section: Metátese De Alcenosunclassified

Processos não Hidrolíticos Sol-Gel: Conceitos e Aplicações em Catálise Heterogênea

et al. 2016

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O desenvolvimento de novos materiais é um tópico de relevância no âmbito das ciências dos materiais, em razão da importante função desempenhada em diversas aplicações na sociedade moderna. No entanto, existe grande preocupação e necessidade no desenvolvimento de processos eficientes e alternativos aos processos sol-gel, sendo este o mais utilizado na síntese de catalisadores heterogêneos. Desse modo, o objetivo deste trabalho é proporcionar um estudo geral sobre os princípios da via alternativa não hidrolítica sol-gel (NHSG), suas potencialidades e vantagens, tais como o controle da estrutura e composição, mostrando ser um método mais eficiente que o processo sol-gel convencional.

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Opposite effect of Al on the performances of MoO3/SiO2-Al2O3 catalysts in the metathesis and in the partial oxidation of propene

Cited by 47 publications

References 49 publications

A non-hydrolytic sol–gel route to highly active MoO3–SiO2–Al2O3 metathesis catalysts

A non-hydrolytic sol–gel route to highly active MoO3–SiO2–Al2O3 metathesis catalysts

Effect of Mo-Doped Mesoporous Al-SSP Catalysts for the Catalytic Dehydration of Ethanol to Ethylene

Processos não Hidrolíticos Sol-Gel: Conceitos e Aplicações em Catálise Heterogênea

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