Study on reaction mechanism and Langmuir-Hinshelwood kinetic model of catalytic denitrification by Fe0 and bimetallic catalyst. Issue 5 (28th May 2021)

• Record Type: Journal Article
• Authors: Yun, Yupan; Wen, Xueyou; Liang, Zhao; Zhu, Zhenya
• Is Part Of: Journal of environmental science and health. Volume 56:Issue 5(2021)
• Page Start: 501
• Page End: 507
• Publication Date: 2021-05-28
• Subjects: Chemical catalytic reduction -- nitrate removal -- reaction mechanism -- first-order kinetics; Environmental engineering -- Periodicals; Environmental sciences -- Periodicals; Ecology -- periodicals; Hazardous Substances -- periodicals; 628
• DOI: 10.1080/10934529.2021.1890496
• Languages: English
• ISSNs: 1093-4529

Abstract

Abstract: The focus of this research was on the catalytic reduction of nitrate to nitrogen gas for the water conservation. Zero-valent iron (Fe 0 ) with bimetallic catalyst that carrier supported palladium (Pd) and copper (Cu) was innovatively applied in this study. First, XPS (X-ray photoelectron spectroscopy) analyses and experiments were conducted to study the mechanism of the catalytic reduction of nitrate. In the catalytic reaction, which is regarded as a stepwise process, Fe 0 was the electron provider; Pd and Cu supported on carrier played indispensable but distinct roles. The kinetics suggested that the process was better reflected by first-order kinetics of the Langmuir-Hinshelwood model. Additionally, first-order kinetics of the catalytic reaction under the effect of catalysts with different carriers (SiO2, silica gel, kaolin, diatomite, γ-Al2 O3, graphene) were further studied. Pd-Cu/graphene catalyst showed higher catalytic performance compared with other catalysts.