Direct Oxidation of Benzene to Phenol with Hydrogen Peroxide over a Modified Titanium Silicalite

Balducci, Luigi; Bianchi, Daniele; Bortolo, Rossella; D’Aloisio, Rino; Ricci, Marco; Tassinari, Roberto; Ungarelli, Raffaele

doi:10.1002/anie.200352184

Cited by 179 publications

(86 citation statements)

References 14 publications

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“…The post-synthetic modification of calcined TS-1 with NH4HF2 and H2O2 was performed in an aqueous solution under the conditions optimised by Bianchi and co-workers for 4 h (catalyst henceforth denoted TS-1B) [8][9][10]. The treatment does not lead to any substantial differences in crystallographic structure, porosity or Ti loading, with each of these parameters remaining constant following NH4HF2 treatment.…”

Section: Synthesis Of Ts-1 and Post-synthetic Modification With Nh4hf2mentioning

confidence: 99%

“…Recent work has demonstrated that post-synthetic modification of TS-1 with NH4HF2 leads to exciting improvements for aromatic hydroxylation activity and selectivity [8][9][10]. Despite this, the impact of this treatment on: (i) the active site speciation; and (ii) the activity of TS-1 for other oxidation reactions, particularly epoxidation, remains almost unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Switching off H2O2 Decomposition during TS-1 Catalysed Epoxidation via Post-Synthetic Active Site Modification

Hammond

Tarantino

2015

Catalysts

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Despite its widespread use, the Lewis acidic zeolite, TS-1, still exhibits several unfavourable properties, such as excessive H2O2 decomposition, which decrease its overall performance. In this manuscript, we demonstrate that post-synthetic modification of TS-1 with aqueous NH4HF2 leads to modifications in epoxidation catalysis, which both improves the levels of epoxide selectivity obtained, and drastically minimises undesirable H2O2 decomposition. Through in situ spectroscopic study with UV-resonance enhanced Raman spectroscopy, we also observe a change in Ti site speciation, which occurs via the extraction of mononuclear [Ti(OSi)4] atoms, and which may be responsible for the changes in observed activity.

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Section: Synthesis Of Ts-1 and Post-synthetic Modification With Nh4hf2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Switching off H2O2 Decomposition during TS-1 Catalysed Epoxidation via Post-Synthetic Active Site Modification

Hammond

Tarantino

2015

Catalysts

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“…In industry, phenol is in most cases produced by a three-step cumene process, which involves high amounts of pollution, highly energy consumption, and the production of by-production acetone [1,2]. The direct hydroxylation of benzene to phenol has attracted much attention as an alternative method of phenol production.…”

Section: Introductionmentioning

confidence: 99%

“…Many kinds of metal species have been investigated in the benzene hydroxylation reaction, such as Ti, V, Fe, Co, and Cu [2,6,11,16]. Among them, vanadium compounds showed excellent catalytic activity in the hydroxylation of benzene, due to their superior redox ability and remarkable stability [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Vanadium Oxide/Reduced Graphene Oxide Composite Catalysts for Enhanced Hydroxylation of Benzene to Phenol

et al. 2016

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Abstract:The vanadium oxide/reduced graphene oxide (VO x /RGO) composites have been prepared by a simple solvothermal method with the assistance of cationic surfactant cetyltrimethylammonium bromide (CTAB). The microstructure and morphology of the resultant VO x /RGO composites have been well characterized. The VO x nanoparticles are highly dispersed on the RGO sheets with a particle size of about 25 nm. When used as hydroxylation catalysts, the VO x /RGO composites are more efficient than individual RGO and vanadium oxide catalysts. The enhanced catalytic performance may be related to not only the well dispersed VO x active species, but also the hydrophobic surface and huge π-electron system of RGO for the adsorption and activation of benzene. In addition, the effects of calcination conditions on the microstructure and catalytic properties of VO x /RGO composites have also been investigated. The uniform VO x nanoparticles on the separated RGO sheets show highly efficient catalytic performance, while the formation of aggregated H x V 2 O 5 and bulk V 2 O 5 species along with the destruction of RGO sheets are poor for the hydroxylation of benzene. Up to 17.4% yield of phenol is achieved under the optimized catalytic reaction conditions.

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“…Thus, one-step process for the production of phenol by direct oxidation of benzene attracts much attention in the recent years. [1][2][3][4][5][6][7][8][9] Heteropoly acids (HPAs) and their related compounds have been used as catalysts in many acid and redox reactions. [10][11][12][13][14][15][16] HPAs have several advantages as catalysts, e.g.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydroxylation of Benzene to Phenol with Hydrogen Peroxide over Cesium Salts of Keggin-type Heteropoly Acids

Shi¹,

Li²,

Yuanhang³

et al. 2012

Acta Chim. Sinica

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Direct Oxidation of Benzene to Phenol with Hydrogen Peroxide over a Modified Titanium Silicalite

Cited by 179 publications

References 14 publications

Switching off H2O2 Decomposition during TS-1 Catalysed Epoxidation via Post-Synthetic Active Site Modification

Switching off H2O2 Decomposition during TS-1 Catalysed Epoxidation via Post-Synthetic Active Site Modification

Facile Synthesis of Vanadium Oxide/Reduced Graphene Oxide Composite Catalysts for Enhanced Hydroxylation of Benzene to Phenol

Catalytic Hydroxylation of Benzene to Phenol with Hydrogen Peroxide over Cesium Salts of Keggin-type Heteropoly Acids

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