Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation
Open Access
- 7 June 2021
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Chemistry
Abstract
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.Keywords
This publication has 57 references indexed in Scilit:
- In-depth understanding the role of seeds in the synthesis of TS-1Applied Catalysis A: General, 2019
- Facile synthesis of hierarchical TS-1 zeolite without using mesopore templates and its application in deep oxidative desulfurizationMicroporous and Mesoporous Materials, 2018
- Intermediate-crystallization promoted catalytic activity of titanosilicate zeolitesJournal of Materials Chemistry A, 2018
- Sandwich-structured CeO2@ZSM-5 hybrid composites for catalytic oxidation of 1, 2-dichloroethane: An integrated solution to coking and chlorine poisoning deactivationApplied Catalysis B: Environment and Energy, 2017
- Low-Cost Synthesis of Titanium Silicalite-1 (TS-1) with Highly Catalytic Oxidation Performance through a Controlled Hydrolysis ProcessIndustrial & Engineering Chemistry Research, 2013
- The hydrothermal synthesis of zeolites: Precursors, intermediates and reaction mechanismMicroporous and Mesoporous Materials, 2005
- Direct Oxidation of Benzene to Phenol with Hydrogen Peroxide over a Modified Titanium SilicaliteAngewandte Chemie, 2003
- A spectroscopic study of amorphous and crystalline Ti-containing silicas and their surface acidityTopics in Catalysis, 2001
- Influence of synthesis media on the TS-1 CharacteristicsStudies in Surface Science and Catalysis, 1999
- Spectroscopic Characterization of Silicalite-1 and Titanium Silicalite-1Journal of Catalysis, 1995