Comparison of oxidation properties of Nb and Sn in mesoporous molecular sieves

Nowak, Izabela; Feliczak, Agnieszka; Nekoksová, Iveta; Čejka, Jiřı́

doi:10.1016/j.apcata.2007.01.025

Cited by 27 publications

(20 citation statements)

References 31 publications

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“…The epoxidation of olefin is one of the most important reactions for both bulk and fine chemicals [1,2]. After pioneering works using Ti-zeolites such as TS-1 [3], mesoporous mixed oxide catalysts with larger pores (e.g., Ti substituted mesoporous silica) were developed to expand its applicability to this reaction [4][5][6][7][8][9][10]. Another approach has been done by immobilization of active molecular complexes (e.g., Ti, Mo, Mn, W) onto heterogeneous supports via organic anchors [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Remarkable effect of ordered mesoporous carbon support in tantalum oxide-catalyzed selective epoxidation of cyclooctene

Lin

Hara

Okubo

et al. 2011

Catalysis Communications

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The olefin epoxidation is one of the most important reactions in chemical industry. Metal oxide supports often cause drawbacks in catalytic activity and selectivity, which has been overcome by introducing hydrophobic organic groups onto the oxide supports. The present study utilizes ordered mesoporous carbon (CMK-3 and CMK-1) as structurally defined hydrophobic catalyst support. Well-dispersed tantalum oxides supported on the ordered mesoporous carbon were prepared. Their application in catalytic epoxidation of cyclooctene demonstrates that the tantalum oxide catalysts on the ordered mesoporous carbon supports show higher performances than those of the catalysts supported on activated carbon and ordered mesoporous silica SBA-15.

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Section: Introductionmentioning

confidence: 99%

Remarkable effect of ordered mesoporous carbon support in tantalum oxide-catalyzed selective epoxidation of cyclooctene

Lin

Hara

Okubo

et al. 2011

Catalysis Communications

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“…For hierarchical materials, e.g., SnFAU 0.5 h U 4 h mix and SnBEA 0.5 h U 4 h mix, a broad ultraviolet and visible-light diffuse reflection (DR UV-Vis) peak (Figure 4) appeared around 214 nm indicating that the tin species are incorporated into the silica pore walls with a tetrahedral coordination [17,18]. No bands typical for polymeric Sn-O-Sn type species (~280 nm) or above 300 nm indicates that no bulk tin oxide is formed [19].…”

Section: Resultsmentioning

confidence: 99%

Catalytic Isomerization of Dihydroxyacetone to Lactic Acid and Alkyl Lactates over Hierarchical Zeolites Containing Tin

et al. 2018

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Hierarchical zeolites containing tin were obtained, characterized and used in a reaction of catalytic isomerization of dihydroxyacetone (DHA) to lactic acid and alkyl lactates. These catalysts are characterized by preserved crystallinity and primary microporosity with the simultaneous existence of secondary porosity regarding mesopores, which facilitates access of large molecules of reagents to active centers. Creation of additional porosity was confirmed by X-ray diffraction and low-temperature nitrogen adsorption/desorption studies. The reaction of dihydroxyacetone isomerization was conducted in different reaction media such as methanol, ethanol or water with the use of two heating methods: microwave radiation and conventional heating. The application of microwave radiation enabled to reduce the reaction time to 1 h and achieve dihydroxyacetone conversion of >90% and high yields of the desired reaction products.

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“…In these cases, it has been shown that the use of tin-mesoporous materials such as Sn-MCM- 41 limitation [165,[178][179][180]. Other oxidizing metals such as Fe(III) [181,182] and Nb [183] have also been incorporated into mesoporous solids such as MCM-41 and MCM-48. It was found that Fe-MCM-41 was active for the Baeyer-Villiger oxidation of cyclic ketones, but their activity was lower than that of Sn-MCM-41, whereas Nb-MCM-41 was not chemoselective when a double bond is present in the molecule, promoting exclusively double bond oxidation.…”

Section: Baeyer-villiger Oxidationsmentioning

confidence: 99%