A review on titanosilicate-1 (TS-1) catalysts: Research progress of regulating titanium species

Wang, Baohe; Guo, Yanke; Zhu, Jing; Ma, Jing; Qin, Qiaoyun

doi:10.1016/j.ccr.2022.214931

Cited by 22 publications

(12 citation statements)

References 142 publications

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“…In addition, for all the materials, V microðN 2 Þ < V microðCO 2 Þ (Table 1), confirming that N 2 faces kinetic restraints to enter the narrow micropores. This observation is consistent with their ultramicroporous nature, [37] although based on the average pore size (APS) determined by the Barret-Joyner-Halenda method (BJH), all the materials retain a certain degree of mesoporosity.…”

Section: N 2 and Co 2 Adsorptionsupporting

confidence: 79%

“…[ 36 ] Therefore, the need to obtain TS with a high TiO 4 content is still a challenge and has led to the development of strategies to slow down the hydrolysis of Ti precursors using complexing agents such as H 2 O 2 , acetylacetonate, or isopropanol. [ 37 ] In this context, Ma et al reported that polyvinylpyrrolidone (PVP) acts as a structure‐directing agent (SDA) in the synthesis of TSs, competing with commonly used surfactants, such as TPAOH, and regulating the nanostructuration of the silica skeleton. [ 38 ] In addition, PVP decreases the condensation rate once the titanium precursor is hydrolyzed, favoring its crosslinking with the hydrolyzed silica precursor.…”

Section: Introductionmentioning

confidence: 99%

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Design of Novel Photoactive Modified Titanium Silicalites and Their Application for Venlafaxine Degradation under Simulated Solar Irradiation

Cruz‐Quesada,

Sampaio,

Espinal‐Viguri

et al. 2023

Solar RRL

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Titanium silicalites (TS) are well‐known materials for their use in industrial oxidation reactions, and although they are used as photocatalysts, their activity is limited. Therefore, numerous synthetic strategies are investigated to improve their photocatalytic activity. Herein, three series of modified titanium silicalites are synthesized using three different organotriethoxysilanes at different molar percentages with the aim of modifying the structure of the zeolite, both at a porous and chemical level, to obtain materials with high photocatalytic activity. The study of their morphological, textural, chemical, and UV–vis light absorption properties through various characterization techniques has allowed the selection of the best candidates to test their photoactivity in the degradation of venlafaxine, an antidepressant drug that persists as a contaminant in wastewater and has serious neurotoxic effects. Materials synthesized using a 5% molar percentage of RTEOS and 10% of PhTEOS (Ph = phenyl) are able to degrade venlafaxine, whereas the reference material does not show any photocatalytic activity. These results lead the way to use this synthetic strategy to develop titanium silicates and optimize their photocatalytic activity in degradation reactions of different pollutants.

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Section: N 2 and Co 2 Adsorptionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Design of Novel Photoactive Modified Titanium Silicalites and Their Application for Venlafaxine Degradation under Simulated Solar Irradiation

Cruz‐Quesada,

Sampaio,

Espinal‐Viguri

et al. 2023

Solar RRL

View full text Add to dashboard Cite

show abstract

“…This function has recently been found and applied in the synthesis of aluminum-containing zeolites such as ZSM-5, H-MOR, MCM-22, etc. − The strong interaction between OSDAs and the inorganic host is studied, and it inspires efforts to tailor the framework Al by optimizing OSDAs . The distribution of Ti species within the matrix is also crucial for TS-1 zeolite, as its content, − coordination states, − as well as accessibility − determines the catalytic performance of TS-1 zeolite. Several strategies , have been developed to adjust the distribution of heteroatoms in the zeolite skeleton.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Titanium Silicalite-1 Zeolite Synthesis Employing ATPAOH as an Organic Structure Directing Agent

Gao,

Zhao,

Xin

et al. 2024

Ind. Eng. Chem. Res.

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Tetrapropylammonium hydroxide (TPAOH) as an organic structure directing agent (OSDA) is of great importance for the preparation of titanium silicalite-1 (TS-1) zeolite. In this paper, we employed a new OSDA, allyltripropylammonium hydroxide (ATPAOH), in the synthesis process and successfully synthesized ATS-1 zeolite (MFI type). Compared with traditional OSDA TPAOH, one of TPAOH's propyl groups is substituted by an allyl group, which endows ATPAOH with unique properties. On the one hand, ATPAOH accelerates the crystallization rate of titanium silicalite zeolite remarkably due to the strong interaction between Ti species and ATPAOH during the crystallization period. On the other hand, ATPAOH is beneficial for the formation of isolated 6coordinated Ti species, thus leading to the generation of lower amount of anatase. Owing to its abundant active Ti species, ATS-1 prepared by ATPAOH as OSDA exhibits a much better catalytic performance for the cyclohexanone ammoximation reaction than TS-1 prepared by TPAOH as OSDA.

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“…To increase the selectivity of glycols, the hydration ratio of H 2 O/EO is usually increased, which also leads to a high water content in the aqueous glycol solution, requiring multistage evaporation and higher energy consumption. In recent years, titanium silicalite-1 (TS-1) catalysts have been widely used in catalytic reactions of various olefins in the multiphase H 2 O 2 /TS-1 oxidation system due to their environmentally friendly and selective catalytic properties. − Recently, researchers attempted to introduce trivalent metals such as Al and Fe into TS-1 to form bifunctional catalysts and used them in olefin epoxidation-hydration reactions. ,− The results showed that the introduction of trivalent metals increased the acidity of TS-1, promoted the ring-opening reaction of EO, and directly converted ethylene and H 2 O 2 to the EG product over bifunctional catalysts under mild experimental conditions. Al/TS-1 has been found to exhibit better catalytic performance in the oxidation–hydration of ethylene, with the conversion and utilization of H 2 O 2 reaching 95 and 90%, respectively, and the yield of EG plus monomethyl ether was greater than 10% .…”

Section: Introductionmentioning

confidence: 99%

Resolving the Reaction Mechanism and Active Sites for Oxidation–Hydration of Ethylene toward Ethylene Glycol Synthesis over Bifunctional Al/TS-1 Catalysts

Nie,

Yang,

Song

et al. 2024

Ind. Eng. Chem. Res.

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Due to the complex internal structure of titanium silicalite-1 (TS-1), the active sites and mechanistic details of catalytic reactions using TS-1-based catalysts have not been well understood. In this work, density functional theory (DFT) calculations were conducted to provide fundamental insights into the reaction mechanism of oxidation−hydration of ethylene toward ethylene glycol production over the TS-1 catalyst model with perfect titanium(IV) active sites and the Al/TS-1 model with both Brønsted acid and titanium(IV) sites. The computational results revealed that the introduction of Al into TS-1 altered the reaction pathway, facilitated the H 2 O 2 activation, and significantly reduced the energy barrier of the rate-limiting step for ethylene glycol generation, demonstrating a synergistic action of Ti−Al(H) sites. Over Al/TS-1, the titanium(IV) site participated in the ethylene epoxidation, while the Brønsted acid site was responsible for the hydration of ethylene oxide to ethylene glycol. The new insights into the catalytic mechanism and the identified role of bifunctional active sites offer a useful reference for the future design of Al/TS-1 catalysts with tailored catalytic performance for this important reaction.

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A review on titanosilicate-1 (TS-1) catalysts: Research progress of regulating titanium species

Cited by 22 publications

References 142 publications

Design of Novel Photoactive Modified Titanium Silicalites and Their Application for Venlafaxine Degradation under Simulated Solar Irradiation

Design of Novel Photoactive Modified Titanium Silicalites and Their Application for Venlafaxine Degradation under Simulated Solar Irradiation

Investigation on Titanium Silicalite-1 Zeolite Synthesis Employing ATPAOH as an Organic Structure Directing Agent

Resolving the Reaction Mechanism and Active Sites for Oxidation–Hydration of Ethylene toward Ethylene Glycol Synthesis over Bifunctional Al/TS-1 Catalysts

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