Au/TS-1 catalyst for propylene epoxidation with H2 and O2: Effect of surface property and morphology of TS-1 zeolite

Xu, Jialun; Zhang, Zhihua; Yu, Daiyi; Du, Wei; Song, Nan; Duan, Xuezhi; Zhou, Xin

doi:10.1007/s12274-023-5440-5

Cited by 15 publications

(2 citation statements)

References 63 publications

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“…For a deep understanding of the several effects of P modification on the Au and Ti active sites over the bifunctional catalyst, the physical mixing method was employed referring to our previous works, − which applies different combinations of uncalcined Ti-free silicalite-1 zeolite immobilized Au catalysts (i.e., Au/S-1-B) and TS-1-B zeolite samples for the HOPO reaction test. The corresponding results of catalytic performance of the physically mixed conventional Au/S-1-B catalyst with pristine TS-1-B sample are presented in Figure , which shows a similar PO activity of ca.…”

Section: Resultsmentioning

confidence: 99%

Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H₂ and O₂

Xu,

Zhang,

et al. 2023

Ind. Eng. Chem. Res.

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Section: Resultsmentioning

confidence: 99%

Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H₂ and O₂

Xu,

Zhang,

et al. 2023

Ind. Eng. Chem. Res.

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“…Firstly, MCM-48 actually has detection signal, but the signal strength is weaker than TS-1 and TS-1@MCM-48. At the chemical shifts of À 95 ppm, À 107 ppm and À 120 ppm, TS-1@MCM-48 corresponds to three main NMR characteristic signals, [44] namely Q2(OH) 2 À SiÀ [OÀ SiÀ (OH) 3 ] 2 , Q3[HOÀ SiÀ OÀ (SiÀ (OH) 3 ) 3 and Q4SiÀ [OÀ SiÀ (OH) 3 ] 4 . TS-1 and TS-1@MCM-48-2.5 have obvious Q4 peak at À 120 ppm, and the Q4 peak intensity of TS-1 is much higher than that of TS-1@MCM-48-2.5.…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

TS‐1@MCM‐48 Core‐Shell Catalysts for Efficient Oxidation of p‐Diethylbenzene to High Value‐Added Derivatives

Guo,

Li,

et al. 2024

Chemistry A European J

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To expand the market capacity of p‐diethylbenzene (PDEB), core‐shell zeolite (TS‐1@MCM‐48) is designed as a catalyst for PDEB oxidation. TS‐1@MCM‐48 catalyst is synthesized by in‐situ crystallization method and characterized by X‐ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), X‐ray photoelectron spectroscopy (XPS), N2 adsorption‐desorption, in‐situ electron paramagnetic resonance (EPR) and 29Si nuclear magnetic resonance (29Si MAS‐NMR). Oxidation of PDEB by H2O2 was investigated systematically in liquid phase. The conversion of PDEB over TS‐1@MCM‐48 was 28.1% and the total selectivity was 72.6%, where the selectivity of EAP (p‐ethylacetophenone) and EPEA (4‐ethyl‐α‐methylbenzyl alcohol) was 28.6% and 44.0%, respectively. Compared with TS‐1 and MCM‐48 zeolite, the conversion rate of reactants and the selectivity of products have been significantly improved. The catalytic performance of TS‐1@MCM‐48 is derived from its well‐crystallized microporous core and mesoporous shell with regular channels, which make active sites of TS‐1 zeolite in the catalyst be fully utilized and mass transfer resistance be largely reduced. Further through theoretical calculation, we propose that the oxidation of PDEB is the result of the combination and mutual transformation of free radical process and carbocation process. Core‐shell structure ensures the conversion rate of raw materials and improves the selectivity of products.

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Shielding effect‐engineered single‐crystalline Ti‐rich nanosized aggregated TS‐1 for 1‐hexene epoxidation

Zong,

Deng,

Lin

et al. 2024

AIChE Journal

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Titanosilicate with H2O2 stands out as a highly consequential oxidized catalytic system, prized for its user‐friendly operation, mild conditions, and eco‐friendly attributes. However, a synthesis strategy for large surface area titanosilicalites approaching the theoretical lowest Si/Ti ratio without extra‐framework Ti species remains an ongoing challenge. In this study, we successfully synthesized single‐crystalline Ti‐rich nanosized aggregated TS‐1 by shielding effect with a Si/Ti polymer. This polymer demonstrated effectiveness in restraining TiO2 species by regulating the proximity of Si/Ti species in Ti‐Diol‐Si polymers. The polymer not only facilitated the synthesis of single‐crystalline Ti‐rich TS‐1 but also exploited the chain length of PEG, functioning as a shielding cage by hydrogen bonds, to synthesize nanosized aggregated TS‐1 (TS‐1‐PEG400). This TS‐1‐PEG400 exhibited superior conversion (~60%), selectivity (~90%), and stability in 1‐hexene epoxidation. This study not only establishes a synthesis pathway for Ti‐rich TS‐1 but also holds the potential to enhance related industrial oxidation reactions involving titanosilicates and H2O2.

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Au/TS-1 catalyst for propylene epoxidation with H2 and O2: Effect of surface property and morphology of TS-1 zeolite

Cited by 15 publications

References 63 publications

Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H₂ and O₂

Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H₂ and O₂

TS‐1@MCM‐48 Core‐Shell Catalysts for Efficient Oxidation of p‐Diethylbenzene to High Value‐Added Derivatives

Shielding effect‐engineered single‐crystalline Ti‐rich nanosized aggregated TS‐1 for 1‐hexene epoxidation

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Au/TS-1 catalyst for propylene epoxidation with H2 and O2: Effect of surface property and morphology of TS-1 zeolite

Cited by 15 publications

References 63 publications

Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H2 and O2

Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H2 and O2

TS‐1@MCM‐48 Core‐Shell Catalysts for Efficient Oxidation of p‐Diethylbenzene to High Value‐Added Derivatives

Shielding effect‐engineered single‐crystalline Ti‐rich nanosized aggregated TS‐1 for 1‐hexene epoxidation

Contact Info

Product

Resources

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Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H₂ and O₂

Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H₂ and O₂