The role of niobium in the gas- and liquid-phase oxidation on metallosilicate MCM-41-type materials

Kilos, Beata A.; Aouine, M.; Nowak, Izabela; Ziółek, Maria; Volta, J.C.

doi:10.1016/j.jcat.2004.03.002

Cited by 72 publications

(21 citation statements)

References 32 publications

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“…The surface area of the bimetallic vanadium-niobium catalyst is actually slightly increased from 899 to 933 m 2 /g. This unusual behavior could be caused by niobium inducing structural changes in MCM-41 as previously observed by Kilos et al [21]. The changes observed in the TPR after niobium incorporation are shown in Fig.…”

Section: Influence Of Vanadium Precursor Niobium Addition and Type Osupporting

confidence: 74%

Influence of Support Surface Area and Niobium Addition on the Reactivity of Vanadium Catalysts for Propane Oxidative Dehydrogenation

et al. 2010

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Vanadium containing catalysts were prepared on silica at vanadia loadings from 1.25 to 12.5% and using different vanadia precursors. Even though no V 2 O 5 crystallites were detected via X-ray powder diffraction or Temperature programmed reduction on the catalysts at vanadia loadings up to 5%, an increased propylene formation rate per gram of vanadium was recorded for catalysts as their surface area increased with decreasing vanadia loading. The propylene formation rate per gram vanadium for all catalysts could be correlated with the total surface area of the catalysts, irrespective of the vanadia loading or vanadia precursor used in the preparation. V-Nb/ MCM-41 was found to be the catalyst with the highest propylene formation rate per gram of vanadium. In addition it is also a highly selective catalyst for propane oxidative dehydrogenation resulting in a propylene selectivity of 57% at 30% propane conversion.

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Section: Influence Of Vanadium Precursor Niobium Addition and Type Osupporting

confidence: 74%

Influence of Support Surface Area and Niobium Addition on the Reactivity of Vanadium Catalysts for Propane Oxidative Dehydrogenation

et al. 2010

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“…The objective of the present work is to synthesize polymeric oxovanadium(IV) complexes of the ligands I and II formed from 5,5 -methylenebis(salicylaldehyde) or 5,5 -dithiobis(salicylaldehyde) and 1,2-diaminocyclohexane, Scheme 1 and study catalytic potential for the oxidation of styrene, cyclohexene and trans-stilbene using tert-butylhydroperoxide (TBHP) as an oxidant. Different types of catalysts have been tested for the oxidation of styrene [20][21][22][23][24][25], cyclohexene [26][27][28][29][30][31][32][33] and trans-stilbene [34][35][36][37][38]. Scheme 1.…”

Section: Introductionmentioning

confidence: 99%

Oxovanadium(IV) based coordination polymers and their catalytic potentials for the oxidation of styrene, cyclohexene and trans-stilbene

Maurya

Kumar

2006

Journal of Molecular Catalysis A: Chemical

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“…Meanwhile, Gallo et al [23] have reported that the oxidation activity of niobiumcontaining MCM-41 (Nb-MCM-41) in the epoxidation of alkene at higher temperature. Nb-MCM-41 also was applied in the oxidation of butyl sulfide and cyclohexene using H 2 O 2 at low temperature [41][42][43][44]. In that case, niobium species is located in the framework of molecularsieves.…”

Section: Performance Of Catalystsmentioning

confidence: 99%

Characterization and Catalytic Performance of Niobic Acid Dispersed over Titanium Silicalite

Prasetyoko

Ramli

Endud

et al. 2008

Advances in Materials Science and Engineering

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Niobic acid, Nb 2 O 5 ·nH 2 O, has been supported on the titanium silicalite by impregnation method. The obtained materials were characterized by X-ray diffraction, infrared, and ultra-violet-visible diffuse reflectance spectroscopy, temperature programmed reduction, pyridine adsorption, and field emission scanning electron microscopy techniques. It was demonstrated that the tetrahedral titanium species still retained after impregnation of niobic acid. The results revealed that niobium species interacted with hydroxyl groups on the surface of TS-1. The niobium species in the catalysts are predominantly polymerized niobium oxides species or bulk niobium oxide with the octahedral structure. All catalysts showed both Brønsted and Lewis acid sites. The catalysts have been tested for epoxidation of 1-octene with aqueous hydrogen peroxide. It was found that the presence of niobic acid in the catalysts enhanced the rate of the formation of epoxide at the initial reaction time. Diol as a side product was also observed due to the acidic properties of the catalysts.

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The role of niobium in the gas- and liquid-phase oxidation on metallosilicate MCM-41-type materials

Cited by 72 publications

References 32 publications

Influence of Support Surface Area and Niobium Addition on the Reactivity of Vanadium Catalysts for Propane Oxidative Dehydrogenation

Influence of Support Surface Area and Niobium Addition on the Reactivity of Vanadium Catalysts for Propane Oxidative Dehydrogenation

Oxovanadium(IV) based coordination polymers and their catalytic potentials for the oxidation of styrene, cyclohexene and trans-stilbene

Characterization and Catalytic Performance of Niobic Acid Dispersed over Titanium Silicalite

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