Synthesis and characterization of Ga-modified Ti-HMS oxide materials with varying Ga content

Zepeda, T.A.; Infantes‐Molina, Antonia; León, J.N. Díaz de; Obeso–Estrella, R.; Fuentes, S.; Alonso-Núñez, G.; Pawelec, B.

doi:10.1016/j.molcata.2014.09.002

Cited by 24 publications

(7 citation statements)

References 49 publications

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“…Considering the possibility of the destruction of the mesoporous surface in Mg(Ca)-Zr/Ti-HMS-T, the TEM measurement was further used to detect the wormhole structure in the prepared samples to investigate whether the microstructure was influenced after modification. As shown in Figure S3, Mg(Ca)-Zr/Ti-HMS-T retained the typical wormhole-like mesostructure, , suggesting that the incorporation of magnesium (calcium) and zirconium metal species step by step did not cause the collapse of the silica framework …”

Section: Resultsmentioning

confidence: 91%

Robust Mg(Ca)Zr-Doped Acid–Base Bifunctional Mesoporous Silica and Their Applications in the Deacetalization-Knoevenagel Reaction

et al. 2021

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A series of Mg(Ca)Zr-doped acid–base bifunctional mesoporous silica were synthesized to study the impact of the one-step or two-step impregnation method on material structure. The two-step method seems to be a better way to synthesize metal-based functionalized catalyst and their catalytic performance is investigated using deacetalization-Knoevenagel reaction as the probe reaction. The coexisting dual active sites and suitable designing routes endowed highly efficient (Conv. >99.6%, Sel. >99.8%) and robust stability (10 consecutive cycles) of these materials. The present process succeeded in preparing catalysts decorated with acid–base sites by doping acidic and alkali metal species rather than grafting organic groups.

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Section: Resultsmentioning

confidence: 91%

Robust Mg(Ca)Zr-Doped Acid–Base Bifunctional Mesoporous Silica and Their Applications in the Deacetalization-Knoevenagel Reaction

et al. 2021

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“…However, in this catalyst, due to the existence of amorphous alumina, some acid sites with low strength are also presented, which would block the pores where the most acidic centers are located, leading to a reduced catalytic activity. Zepeda et al [25] synthesized Ga-modified Ti-HMS materials with varying Ga content. The incorporation of Ga creates both Brönsted and Lewis acid sites, and is preferential to the population of Brönsted acid sites.…”

Section: Acidic Active Sitesmentioning

confidence: 99%

Oriented Decoration in Metal-Functionalized Ordered Mesoporous Silicas and Their Catalytic Applications in the Oxidation of Aromatic Compounds

et al. 2018

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Ordered mesoporous silicas (OMSs) attract considerable attention due to their advanced structural properties. However, for the pristine silica materials, the inert property greatly inhibits their catalytic applications. Thus, to contribute to the versatile surface of OMSs, different metal active sites, including acidic/basic sites and redox sites, have been introduced into specific locations (mesoporous channels and framework) of OMSs and the metal-functionalized ordered mesoporous silicas (MOMSs) show great potential in the catalytic applications. In this review, we first present the categories of metal active sites. Then, the synthesized processes of MOMSs are thoroughly discussed, in which the metal active sites would be introduced with the assistance of organic groups into the specific locations of OMSs. In addition, the structural morphologies of OMSs are elaborated and the catalytic applications of MOMSs in the oxidation of aromatic compounds are illustrated in detail. Finally, the prospects for the future development in this field are proposed.

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“…To overcome this drawback, mesoporous titanosilicates have been developed and proved to be potential catalysts in a wide range of oxidation reactions, especially for bulky organic molecules oxidation. In recently years, many researches have been conducted on synthesis of Ti containing mesoporous silica, such as, Ti-MCM-type, [4][5][6][7] Ti-HMS-type, [8][9][10][11] Ti-SBA-type, [12][13][14][15][16] etc., and these catalysts have shown excellent catalytic properties in oxidization reaction including hydroxylation of aromatics, 3 oxidative desulfurization, 17 oxidation of alkenes 18 and so on. Nevertheless, these catalysts suffer from cumbersome synthesis procedures and high cost of templates.…”

Section: Introductionmentioning

confidence: 99%

Controllable synthesis of mesoporous titanosilicates for styrene oxidization using a nanocellulose template strategy

et al. 2017

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Synthesis and characterization of Ga-modified Ti-HMS oxide materials with varying Ga content

Cited by 24 publications

References 49 publications

Robust Mg(Ca)Zr-Doped Acid–Base Bifunctional Mesoporous Silica and Their Applications in the Deacetalization-Knoevenagel Reaction

Robust Mg(Ca)Zr-Doped Acid–Base Bifunctional Mesoporous Silica and Their Applications in the Deacetalization-Knoevenagel Reaction

Oriented Decoration in Metal-Functionalized Ordered Mesoporous Silicas and Their Catalytic Applications in the Oxidation of Aromatic Compounds

Controllable synthesis of mesoporous titanosilicates for styrene oxidization using a nanocellulose template strategy

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