[1]CHEN Yiliang,SHI Xiaohong,Guo Shiling,et al.Effect of ion exchange on potassium content and acid properties of L zeolite[J].Journal of Zhengzhou University (Engineering Science),2007,28(04):24-27.[doi:10.3969/j.issn.1671-6833.2007.04.007]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
28卷
Number of periods:
2007年04期
Page number:
24-27
Column:
Public date:
1900-01-01
- Title:
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Effect of ion exchange on potassium content and acid properties of L zeolite
- Author(s):
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CHEN Yiliang; SHI Xiaohong; Guo Shiling; etc
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- Keywords:
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L zeolite; ion exchange; potassium oxide content; acidic; Acid content; Acid strength
- CLC:
-
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- DOI:
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10.3969/j.issn.1671-6833.2007.04.007
- Abstract:
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In order to optimize the application of L zeolite in petroleum catalytic cracking, L zeolite was modified by different ion exchange methods. The effects of different ion exchange methods on reducing the potassium content of L zeolite and the changes of L zeolic acid properties after modification were investigated. The results showed that the combination of ion exchange and water vapor treatment was more effective in reducing the potassium content of L zeolite, and the potassium oxide content of L zeolite samples after tertiary ion exchange and tertiary water vapor treatment could be reduced to 0.82%. The results of NH3–TPD heating and desorption experiments showed that the strength of the acid center on the modified L zeolite surface increased, the acid strength distribution became wider, and the total acid content decreased. From the infrared pyridine adsorption spectra, it can be seen that B acid center and L acid center appeared on the surface of L zeolite after modification.