IN-SITU PREPARATION OF Cu/Al MODIFIED MCM-41 MOLECULAR SIEVE CATALYST AND ITS DEOXYGENATION PERFORMANCE

WANG Xiaoyan; LIANG Meisheng; ZHANG Tong; CHEN Xi; LI Long

doi:10.13205/j.hjgc.202307026

Volume 41 Issue 7

Jul. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(7): 192-200

WANG Xiaoyan, LIANG Meisheng, ZHANG Tong, CHEN Xi, LI Long. IN-SITU PREPARATION OF Cu/Al MODIFIED MCM-41 MOLECULAR SIEVE CATALYST AND ITS DEOXYGENATION PERFORMANCE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(7): 192-200. doi: 10.13205/j.hjgc.202307026

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WANG Xiaoyan, LIANG Meisheng, ZHANG Tong, CHEN Xi, LI Long. IN-SITU PREPARATION OF Cu/Al MODIFIED MCM-41 MOLECULAR SIEVE CATALYST AND ITS DEOXYGENATION PERFORMANCE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(7): 192-200. doi: 10.13205/j.hjgc.202307026

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IN-SITU PREPARATION OF Cu/Al MODIFIED MCM-41 MOLECULAR SIEVE CATALYST AND ITS DEOXYGENATION PERFORMANCE

doi: 10.13205/j.hjgc.202307026

College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received Date: 2023-01-12

Abstract

Abstract

Cu/Al-MCM-41 molecular sieve catalyst modified by Cu and Al was prepared by a one-step hydrothermal synthesis method for desolved oxygen (DO) removal in reclaimed water. The effects of the adding amount of active metal, pH of catalyst preparation, crystallization temperature and crystallization time on the removal rate of DO were investigated. The results revealed that when the molar ratio of Cu/Si and Al/Si were 0.2 and 0.1, respectively, pH was 10.5, and Cu/Al-MCM-41 was crystallized at 140℃ for 36 hours, the removal rate of DO in reclaimed water reached 97.0% after 60 min. Meanwhile, the quality of reclaimed water and simulated water had little influence on the DO removal effect. Carbohydrazide was secondary decomposed into N₂ and four hydrogen atoms (H·), under the catalysis of Cu/Al-MCM-41. The increase in the concentration of hydrogen atoms adsorbed on the catalyst surface led to the rapid reduction of DO concentration. The introduction of Cu and Al could significantly increase the acidic sites and enhance the total acidity of catalysts to promote the decomposition of DO, to generate more oxidizing hydroxyl radicals (·OH), which can combine with hydrogen atoms with higher activity and reducibility to form H₂O. This speeds up the removal of dissolved oxygen.
- Cu/Al-MCM-41,
- molecular sieves,
- catalyst,
- dissolved oxygen,
- preparation,
- reclaimed water

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References

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