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Synthesis of Low Silicon Aluminum Ratio X Molecular Sieve from Potassium Feldspar and Its Ion Exchange Property
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Zhiyuan HAN, Minglei GOU, Ziwan CHEN, Yonghua DUAN, Zhen LIU
Journal of the Chinese Ceramic Society | 2023, 51(11) : 2978 - 2985
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Journal of the Chinese Ceramic Society | 2023, 51(11): 2978-2985
• Research Articles •
Synthesis of Low Silicon Aluminum Ratio X Molecular Sieve from Potassium Feldspar and Its Ion Exchange Property
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Zhiyuan HAN, Minglei GOU, Ziwan CHEN, Yonghua DUAN, Zhen LIU
Affiliations
  • School of Chemistry and Chemical Engineering, Henan University of Science and Technology, Luoyang 471023, Henan, China

    • HAN Zhiyuan (1999-), male, Master candidate. E-mail:

About Author:

HAN Zhiyuan (1999-), male, Master candidate. E-mail:

Published: 2023-08-14 doi: 10.14062/j.issn.0454-5648.20230349
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Low silicon aluminum ratio X molecular sieve (LSX) modified by lithium is widely used in the field of pressure swing adsorption (PSA) due to its high N2 adsorption capacity and nitrogen-to-oxygen separation ratio. However, the price of raw materials for the LSX synthesis increases, resulting in a higher production cost. Potassium feldspar (i.e., KAlSi3O8) is rich in aluminum oxide and silicon oxide, and potassium can also be used as a structural guide agent for LSX as an ideal raw material that can greatly reduce the production cost for the LSX synthesis. LSX was synthesized by using seed crystal as a guiding agent with a potassium feldspar from Songxian, China as a raw material, which was firstly calcined and activated at a high temperature. The effects of silicon aluminum ratio (n(SiO2/n(Al2O3)), alkali silicon ratio (n(Na2O+K2O)/n(SiO2), water alkali ratio (n(H2O)/n(Na2O+K2O)), amount of seed guide agent (ωSDA), crystallization temperature (Tcry), and crystallization time (tcry) on the structure and properties of samples were investigated. The results show that when n(SiO2)/n(Al2O3)=2.1-2.2, n(Na2O+K2O)/n(SiO2)=2.0-2.2, n(H2O)/n(Na2O+K2O)=35-40, ωSDA=3%-5%, Tcry=90-100 ℃, tcry=10-14 h, the obtained LSX molecular sieve has a high crystallinity, and a uniform morphology, and the exchange degree of Li+ can reach 98.7%, which obtain the properties for nitrogen and oxygen adsorption separation in industry.

potassium feldspar  /  high temperature activation  /  seed guide agent  /  low silicon aluminum ratio zeolite  /  ion exchange
韩志远, 勾明雷, 陈紫宛, 段永华, 刘振. 钾长石合成低硅铝比X分子筛及其离子交换性能. 硅酸盐学报, 2023 , 51 (11) : 2978 -2985 . DOI: 10.14062/j.issn.0454-5648.20230349
Zhiyuan HAN, Minglei GOU, Ziwan CHEN, Yonghua DUAN, Zhen LIU. Synthesis of Low Silicon Aluminum Ratio X Molecular Sieve from Potassium Feldspar and Its Ion Exchange Property[J]. Journal of the Chinese Ceramic Society, 2023 , 51 (11) : 2978 -2985 . DOI: 10.14062/j.issn.0454-5648.20230349
Appendix
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Year 2023 volume 51 Issue 11
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Article Info
doi: 10.14062/j.issn.0454-5648.20230349
  • Receive Date：2023-05-19
  • Online Date：2026-10-19
  • Published：2023-08-14
Article Data
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History
  • Received：2023-05-19
  • Revised：2023-06-23
Funding
Affiliations
    School of Chemistry and Chemical Engineering, Henan University of Science and Technology, Luoyang 471023, Henan, China

Corresponding:

GOU Minglei (1984-), male, Ph.D., Associate Professor. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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