Low-cost synthesis of size-controlled TS-1 by using suspended seeds: From screening to scale-up

Liu, Meng; Chang, Zhonghua; Wei, Huijuan; Li, Baojun; Wang, Xiangyu; Wen, Yanwei

doi:10.1016/j.apcata.2016.07.006

Cited by 42 publications

(20 citation statements)

References 49 publications

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“…46 The absorption band at 960 cm À1 is attributed to the vibration of the Si-O-Ti or Si-O bond perturbed by Ti atoms in the framework. 47,48 The intensity ratio between the absorption bands at 960 cm À1 and 800 cm À1 (I 960/ 880 ) is usually used to evaluate the relative content of Ti in the framework. 49 Generally, a larger I 960/880 value means a higher framework titanium content.…”

Section: Resultsmentioning

confidence: 99%

Titanosilicate zeolite precursors for highly efficient oxidation reactions

et al. 2020

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Section: Resultsmentioning

confidence: 99%

Titanosilicate zeolite precursors for highly efficient oxidation reactions

et al. 2020

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“…Typically, ethanolamine (EOA) and TPABr were mixed with deionized water, and fumed silica was added to the mixture under stirring (solution A). Under vigorous stirring, solution B of tetrabutyl titanate (TBOT) and isopropanol was added dropwise to solution A to form solution C. A suspension of nanosized S-1 zeolite seeds was added to solution C ( Liu et al, 2016 ), and then the resulting sol was further stirred at 25°C for 24 h. Finally, the sol was crystallized at 175°C in a Teflon-lined autoclave under stirring for 6–72 h. The as-synthesized solid was centrifuged and washed with water and then dried at 120°C overnight, followed by calcination at 550°C for 6 h. The filtrate obtained in the centrifugation was reused in the subsequent synthesis. The method for determining the concentrations of EOA and TPABr in the filtrate is listed in Supplementary Material .…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

et al. 2021

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Developing an effective and low-cost system to synthesize titanium silicalite-1 (TS-1) zeolite is desirable for a range of industrial applications. To date, the poor catalytic activity of the synthesized zeolite due to the low amount of framework titanium and large crystal size is the main obstacle limiting the widespread application of this material. Moreover, a large amount of wastewater is often produced by the existing synthesis process. Herein, a green and sustainable route for synthesizing small-crystal TS-1 with a high fraction of framework Ti was demonstrated via a seed-assisted method using a tetrapropylammonium bromide (TPABr)-ethanolamine hydrothermal system. The influence of the synthesis conditions on the physicochemical properties and catalytic activities of TS-1 was investigated. With the assistance of nanosized S-1 seeds, the incorporation of Ti into the framework of TS-1 was promoted, and the crystallization rate was effectively accelerated. After alkaline etching, the obtained hierarchical TS-1 had higher catalytic activity towards propylene epoxidation with an extremely high turnover frequency of 1,650 h−1. Furthermore, the mother liquid during the hydrothermal reaction could be reused for the next synthesis procedure. Consequently, utilization ratios of both ethanolamine and TPABr exceeding 95% were achieved by recycling the mother liquid. This low-cost approach for reducing wastewater could be easily scaled up to provide a promising synthesis method for the industrial production of TS-1 and other topological zeolites.

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“…TS‐1 zeolite however suffers from serious mass transfer limitation and doesn′t show its full potential catalytic activity toward the bulky substrates. Decrease in crystal size to nanoscale and/or building up intracrystalline mesoporosity to facilitate mass transfer and increase in Ti content are vital factors for efficient catalytic performances . This is because nanosized zeolites possess increased external surface area and pore mouth and these properties enhance catalytic activity toward bulky substrates .…”

Section: Introductionmentioning

confidence: 99%

Efficient Synthesis of Titaniosilicalite‐1 Zeolite Nanoparticles Under Solvent‐free Conditions for the Oxidation of Dibenzothiophene: Impact of Silica Precursor

Shakeri

2019

ChemistrySelect

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Various silica precursors of tetraethyl orthosilicate (TEOS), mesocellular silica foam (MCF), and a combination of TEOS and MCF are investigated under solvent-free conditions to achieve efficient TS-1 catalyst. The obtained TS-1 catalysts were characterized by powder XRD, FTIR, diffusive reflectance UV-Vis, FE-SEM, TEM, N 2 sorption, DLS, and EDS. The TS-1 synthesized by combination of TEOS and MCF possesses smaller crystal size, higher yield of solid materials, and enhanced Ti incorporation than that obtained by either only MCF or TEOS. The average particle size of TS-1 catalysts synthesized by using MCF, TEOS, and the combination of TEOS and MCF were about 350, 170, and 105 nm, respectively. The yield of solid TS-1 by using MCF, TEOS, and the combination of TEOS and MCF were 0.28, 0.80, and 1.20 g-TS-1/g-TPAOH, respectively. Oxidation of 1000 ppm of the bulky substrate of dibenzothiophene (DBT; kinetic diameter 0.9 nm) by TS-1 synthesized by combination of TEOS and MCF was about two times higher than that by the TS-1 catalyst prepared either by TEOS or MCF. Furthermore, oxidation of 5000 ppm of DBT (equally to 5 separate batches) by this catalyst resulted in full conversion in 24 h. Consequently, the use of combination of TEOS and amorphous silica of MCF as silica precursor under solvent-free conditions is a practical approach to prepare efficient TS-1 catalyst.

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Low-cost synthesis of size-controlled TS-1 by using suspended seeds: From screening to scale-up

Cited by 42 publications

References 49 publications

Titanosilicate zeolite precursors for highly efficient oxidation reactions

Titanosilicate zeolite precursors for highly efficient oxidation reactions

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

Efficient Synthesis of Titaniosilicalite‐1 Zeolite Nanoparticles Under Solvent‐free Conditions for the Oxidation of Dibenzothiophene: Impact of Silica Precursor

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