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Gao X, Luo B, Hong Y, He P, Zhang Z, Wu G. Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild conditions. Front Chem Sci Eng 2023. [DOI: 10.1007/s11705-022-2280-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Yang Z, Peng M, Li Y, Wu X, Gui T, Li Y, Zhang F, Chen X, Kita H. Improved Esterification of Citric Acid and n-Butanol Using a Dense and Acid-Resistant Beta Zeolite Membrane. MEMBRANES 2022; 12:1269. [PMID: 36557176 PMCID: PMC9784803 DOI: 10.3390/membranes12121269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/08/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
In this work, a dense and acid-resistant beta zeolite membrane was applied to improve the esterification of citric acid and n-butanol, for the first time. Through the continuous removal of the by-product water via pervaporation (PV), the conversion of citric acid was significantly enhanced from 71.7% to 99.2% using p-Toluenesulfonic acid (PTSA) as catalyst. PTSA was a well-known strong acid, and the membrane kept almost no change after PV-esterification, indicating the superior acid resistance of beta zeolite membrane. Compared to the use of acid-resistant MOR zeolite membrane by PV-esterification, a consistently higher conversion of citric acid was obtained using a high-flux beta zeolite membrane. The results showed that high water permeation on the beta zeolite membrane, with good acid resistance, had a strong promoting effect on esterification, leading to an improved conversion. In addition, the citric acid conversion of 97.7% could still be achieved by PV-esterification at a low reaction temperature of 388 K.
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Affiliation(s)
- Zhengquan Yang
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
| | - Mingyu Peng
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
| | - Yu Li
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
| | - Xiaowei Wu
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
| | - Tian Gui
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
| | - Yuqin Li
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
| | - Fei Zhang
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
| | - Xiangshu Chen
- State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, Institute of Advanced Materials (IAM), Jiangxi Normal University, Nanchang 330022, China
- Environmental Science and Engineering, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube 755-8611, Japan
| | - Hidetoshi Kita
- Environmental Science and Engineering, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube 755-8611, Japan
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Li Y, Li Y, Yang Z, Xu W, Gui T, Wu X, Zhu M, Chen X, Kita H. Rapid synthesis of high-selective Al-rich beta zeolite membrane via an organic template-free route for pervaporation dehydration of water-n-butanol mixtures. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Wang S, Li L, Li J, Wang J, Pan E, Lu J, Zhang Y, Yang J. Sustainable synthesis of highly water-selective ZSM-5 membrane by wet gel conversion. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119431] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Preparation of Continuous Highly Hydrophobic Pure Silica ITQ-29 Zeolite Layers on Alumina Supports. Molecules 2020; 25:molecules25184150. [PMID: 32927912 PMCID: PMC7570531 DOI: 10.3390/molecules25184150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 09/07/2020] [Accepted: 09/08/2020] [Indexed: 11/16/2022] Open
Abstract
The preparation of continuous layers of highly hydrophobic pure silica ITQ-29 zeolite, potentially applicable as hydrophobic membranes for separation of molecules based on their polarity, has been investigated. Continuous layers of intergrown ITQ-29 zeolite crystals were successfully grown on porous alumina supports by optimization of the synthesis conditions, such as the appropriate selection of the seeds, the procedure for the gel preparation, and the calcination conditions. This resulted in the formation of all silica ITQ-29 zeolite layers without the presence of germanium required in previously reported ITQ-29 membranes, with the subsequent improvement in quality and stability, as verified by the absence of cracks after calcination. We have proved that the incorporation of aluminum from the support into the zeolite layer does not occur, neither during the secondary growth nor through migration of aluminum species during calcination.
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