Creation of Hierarchical Titanosilicate TS‐1 Zeolites

Bai, Risheng; Song, Yue; Bai, Ruobing; Yu, Jihong

doi:10.1002/admi.202001095

Cited by 43 publications

(35 citation statements)

References 129 publications

(157 reference statements)

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“…Intense work has been undertaken in order to obtain titanosilicates that exhibit tailored physico‐chemical properties and enhanced catalytic performance in epoxidation. The recent advances made specifically on hierarchical TS‐1, Ti‐containing zeolites, and ordered titanosilicates, were discussed in details in the reviews published in 2021 by Yu et al., [16] in 2018 by Bellussi and Millini, [17] and in 2014 by Moliner and Corma, [18] respectively. Also, a comprehensive comparison of the catalytic performance of titanosilicate catalysts used in epoxidation can be found in the review of Přech from 2018 [19] …”

Section: Contextmentioning

confidence: 99%

Titanosilicate Epoxidation Catalysts: A Review of Challenges and Opportunities

2021

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Epoxidation reactions are tremendously important for modern chemistry, as they lead to series of highly useful bulk and fine chemicals, monomers, and intermediates for organic synthesis. Progress in epoxidation processes goes hand in hand with the advancement made in catalysis science. In this context, heterogeneous catalysts, and particularly Ti‐based formulations, are playing a central role and have seen tremendous developments over the past two decades, leveraging on advanced materials science. The aim of this review is to illustrate the various strategies of titanosilicate catalysts preparation that can lead to more versatile, more performant, and greener epoxidation processes. We successively cover (i) supported catalysts, obtained by the grafting of Ti species onto preformed silica supports, (ii) microporous crystalline titanosilicates (zeolites), and (iii) amorphous titanosilicates obtained by sol‐gel chemistry. For each category, with an emphasis on catalyst preparation, the challenges that have to be tackled to boost catalyst performance are highlighted. From that point, we present a critical review of the different approaches that have been proposed in the primary literature to tailor the properties that govern catalysts performance (activity, selectivity, stability, ease of handling). This is done by better controlling the nature of the active surface species, adapting particles size and shape, optimizing texture, modifying surface chemistry, etc. These lines of attack encompass molecular approaches for the grafting of well‐defined species, top‐down and bottom‐up synthesis of hierarchically porous zeolites, advanced sol‐gel routes potentially performed in non‐conventional media or coupled with original processing, preparation of self‐standing monoliths, etc. Future research directions are discussed with emphasis on the application scope of new catalytic materials and possible approaches to increase catalyst performance.

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Section: Contextmentioning

confidence: 99%

Titanosilicate Epoxidation Catalysts: A Review of Challenges and Opportunities

2021

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“…With the analogy from our previous studies and taking into account the results of quantum-chemical calculations [ The second group of catalysts studied in the reaction of N 2 O decomposition comprised crystalline Ti-silicalites with different Si/Ti ratios and amorphous TiO 2 -SiO 2 systems. The Ti-silicalites have been chosen for the investigation in the title reaction, since they exhibit unique catalytic properties in the reactions of selective oxidation of phenol into diphenols using H 2 O 2 as an oxidizing agent [27,29]. The active centers responsible for these properties of the Ti-silicalites are should be titanyl groups Ti=O or isolated tetrahedral Ti +4 ions [29].…”

Section: Resultsmentioning

confidence: 99%

“…The aim of this work was to find new zeolite and zeolite-like catalysts that are active in N 2 O decomposition and to study the nature of active sites and plausible reaction mechanisms, with an emphasis on the role of coordinatively unsaturated cations. Three groups of catalysts were chosen for the investigation: − Dehydroxylated HZSM-5 zeolites and ZSM-5 zeolites modified with zinc oxide, which have been studied earlier from the point of view of the nature and strength of Lewis acid sites [25,26], i.e., the systems containing strong coordinatively unsaturated cations (Lewis acid sites); − Crystalline Ti-silicalites that are widely used as efficient catalysts for the selective oxidation of phenol into diphenols by H 2 O 2 in the liquid phase [27]; − Amorphous catalysts, based on the Ti/SiO 2 system, which differ in the Ti/Si ratio and in the preparation method.…”

Section: Introductionmentioning

confidence: 99%

Nitrous Oxide Adsorption and Decomposition on Zeolites and Zeolite-like Materials

2022

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Decomposition of N2O on modified zeolites, crystalline titanosilicalites, and related amorphous systems is studied by the catalytic and spectroscopic methods. Zinc-containing HZSM-5 zeolites and titanosilicalites with moderate Ti/Si ratios are shown to exhibit a better catalytic performance in N2O decomposition as compared with conventionally used Cu/HZSM-5 zeolites and amorphous Cu-containing catalysts. Dehydroxylation of the HZSM-5 zeolite by calcination at 1120 K results in an enhancement of the N2O conversion. The mechanism of the reaction and the role of coordinatively unsaturated cations and Lewis acid sites in N2O decomposition are discussed on the basis of the spectroscopic data.

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“…2 The conditions used in each step may affect the thermodynamics and the kinetics of the zeolite formation; therefore, many efforts were devoted to study the zeolite crystallization mechanism under hydrothermal conditions, 3–7 and particular attention was delivered to the synthesis of highly or purely siliceous materials. 8–14…”

Section: Introductionmentioning

confidence: 99%