Dynamic Model of Catalytic Denitrification of Nitrate over Pd-Cu Catalysts from Groundwater

Hong Yuan Liu; Yan Zhang

doi:10.4028/www.scientific.net/AMR.322.195

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 322Dynamic Model of Catalytic Denitrification of...

Dynamic Model of Catalytic Denitrification of Nitrate over Pd-Cu Catalysts from Groundwater

Abstract:

Groundwater polluted by nitrate contaminant is becoming a critical issue in China and worldwide. Catalytic denetrification of nitrate over Pd-Cu bimetallic catalyst shows a potential technique for the removal of nitrate from groundwater. In this study, a series of reduction experiments using γ-Al₂O₃ supported Pd-Cu particle catalysts in a batch slurry reactor were carried out. A tentative reaction mechanism and the dynamic model for catalytic nitrate reduction were discussed. It was found that nitrate consumption is based on the conventional Langmuir-Hinshelwood kinetic approach, assuming an irreversible bimolecular surface reaction between adsorbed reactant species to be the rate-controlling step. The equilibrium hydrogen adsorption constant K_ads and the apparent surface reaction rate constant k_app were equal to 5.11×10^-2 l/mg and 48.31mg/(l.gcat.min) at 293K temperature, respectively. The apparent activation energy for catalytic nitrate reduction, in the temperature range 280-298K, was found to be 36.8kJ/mol. The low value of activation energy obtained in this work confirms the very high effective and suitability of Pd-Cu catalysts for nitrate reduction.

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Periodical:

Advanced Materials Research (Volume 322)

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195-200

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.322.195

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August 2011

Authors:

Hong Yuan Liu, Yan Zhang

Keywords:

Catalytic Denetrification, Dynamic Model, Nitrate, Pd-Cu Catalyst

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