Direct epoxidation of propylene with hydrogen peroxide over TS-1 catalysts: Effect of hydrophobicity of the catalysts

Park, Sunyoung; Cho, Kyung Min; Youn, Myung-Joong; Seo, Jeong Gil; Jung, Ji Chul; Baeck, Sung‐Hyeon; Kim, Tae Jin; Chung, Young-Min; Oh, Seung-Hoon; Song, In Kyu

doi:10.1016/j.catcom.2008.07.003

Cited by 45 publications

(24 citation statements)

References 16 publications

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“…In order to verify this explanation, we performed the reaction between propylene and HP in the absence of H 2 /O 2 and the reaction between H 2 and O 2 under the same conditions but without propylene. As reported previously, [46] the first reaction proceeded rapidly under our conditions in the presence of regular TS-1, thus showing that the original (reprocess) method produces a more active and selective titanosilicate. The second experiment confirmed the ability of the Pd component to produce HP.…”

Section: Catalytic Epoxidation Resultssupporting

confidence: 65%

NHTS: A Hollow, Noble‐Metal‐Modified Titanium Silicalite

et al. 2009

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The major drawback of direct oxidation technology (onsite hydrogen peroxide production followed by its conversion into organic oxides without refining) is the design and preparation of the bifunctional catalysts used therein. Herein we present a bifunctional catalytic material (NHTS), which is synthesized by a revised semi-in-situ method that allows a noble metal to be distributed throughout the titanosilicate framework and also results in a redistribution of active Ti species throughout the crystals, thereby enriching the sur-

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Section: Catalytic Epoxidation Resultssupporting

confidence: 65%

NHTS: A Hollow, Noble‐Metal‐Modified Titanium Silicalite

et al. 2009

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“…8), promoting reactivity [21]. In the case of aprotic Ti-beta or TS-1 prepared by the polystyrene bead method [21,22] and as such it might be expected that aprotic solvents would be less effective in forming and stabilising the intermediate. In this study however, an aprotic solvent compared favourably to protic solvents, in particular in terms of allyl alcohol conversion.…”

Section: Discussionmentioning

confidence: 99%

Influence of impurities on the epoxidation of allyl alcohol to glycidol with hydrogen peroxide over titanium silicate TS-1

Harvey

Kennedy

Dlugogorski

et al. 2015

Applied Catalysis A: General

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“…In several liquid-phase epoxidation routes to convert propene into propene oxide, much attention has been directed to heterogeneous catalytic oxidation using hydrogen peroxide as a more environmentally benign and profitable chemical process [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Titanium silicalite (TS-1) catalyst has been extensively investigated for this route because propene oxide can be produced with a high selectivity in methanol under mild conditions [4,5,[10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The direct epoxidation process based on hydrogen peroxide (oxidant) and TS-1 (catalyst) was commercialized and referred to as "hydrogen peroxide-to-propene oxide" (HPPO) process.…”

Section: Introductionmentioning

confidence: 99%

The effects of impregnation of precious metals on the catalytic activity of titanium silicate (TS-1) in epoxidation of propene using hydrogen peroxide

Shin

Lee

Chadwick

2016

Journal of Molecular Catalysis A: Chemical

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Propene oxide is an important chemical intermediate and titanium silicalite (TS-1) has been widely investigated as a promising catalyst for the direct epoxidation of propene with ex-situ or in-situ produced hydrogen peroxide as an oxidant. In order to clarify the effects of the kind of precious metal and treatment process in the catalyst preparation on the propene epoxidation and the hydrogen peroxide decomposition, TS-1 was impregnated with gold and palladium via drying, calcination and reduction and the experiments to check its catalytic performance were conducted in a gas aspirating autoclave reactor in the absence of mass transfer limitations. The presence of precious metals vigorously catalyzed the side reactions and hydrogen peroxide decomposition. Some of the precious metal containing TS-1 catalysts showed high initial rates but there was no catalyst with a propene oxide yield after 5 h reaction time comparable to TS-1 alone because of the enhancement of side reactions by precious metals. The significant decline in the selectivity to propene oxide over the dried precious metal containing TS-1 catalysts was attributed to the leaching of precious metals into the reaction medium. Palladium containing TS-1 showed exceptionally high decomposition of hydrogen peroxide. Reduction and calcination increased the decomposition by forming metallic gold and palladium. Homogeneous dispersion of gold nanoparticles was achieved by a sol immobilization method which led to a decrease of propene oxide selectivity and an increase of hydrogen peroxide decomposition.

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Direct epoxidation of propylene with hydrogen peroxide over TS-1 catalysts: Effect of hydrophobicity of the catalysts

Cited by 45 publications

References 16 publications

NHTS: A Hollow, Noble‐Metal‐Modified Titanium Silicalite

NHTS: A Hollow, Noble‐Metal‐Modified Titanium Silicalite

Influence of impurities on the epoxidation of allyl alcohol to glycidol with hydrogen peroxide over titanium silicate TS-1

The effects of impregnation of precious metals on the catalytic activity of titanium silicate (TS-1) in epoxidation of propene using hydrogen peroxide

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