Investigating the Effect of Deactivation Rate Constant of Polymer-Based Silver Catalyst on the Reduction of Pollutant 4-Nitrophenol to 4-Aminophenol

Document Type : Chemistry Article

Authors

1 Ph.D. Candidate, Department of chemical engineering, Faculty of Engineering, University of Mohaghegh Ardabili

2 Professor, Chemical Engineering Department, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran.

Abstract

The catalytic reduction of the organic pollutant, 4-nitrophenol to 4-aminophenol was simulated as a model reaction in contact with the polymer-based silver catalyst in a packed bed. The decrease in the catalyst activity as a result of the product residues on the catalyst and also the effect of the deactivation rate constant and conversion rate changes was investigated. Three different values for the deactivation rate constant were chosen as 4.8´10-5, 2.4´10-4, and 1.2´10-3 m3 mol-1 s-1. The results showed that by increasing the catalyst deactivation rate constant, at the end of the studied time, the conversion decreases by 2, 10, and 70%, respectively, and the catalyst activity decreases by 25, 75, and 95%, respectively. Also, the activity of the catalyst throughout the catalytic bed exhibited a greater drop compared to the upper part of the bed due to the accumulation of the product in the lower part of the bed. Therefore, it is important to choose an appropriate catalyst with the minimum deactivation rate constant to achieve the highest conversion percentage and the highest catalyst activity value.

Keywords

Main Subjects

References

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Journal of Modeling in Engineering
Volume 22, Issue 77
August 2024
Pages 117-127

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History

  • Receive Date: 22 July 2023
  • Revise Date: 14 December 2023
  • Accept Date: 09 January 2024

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