NDLI: Nitrate reduction on the surface of bimetallic catalysts supported by nano-crystalline beta-zeolite (NBeta)

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Nitrate reduction on the surface of bimetallic catalysts supported by nano-crystalline beta-zeolite (NBeta)

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Nitrate reduction on the surface of bimetallic catalysts supported by nano-crystalline beta-zeolite (NBeta)

Content Provider	Royal Society of Chemistry (RSC)
Author	Kim, Hyungjun Han, Jong-In Kumar, Macharla Arun Lee, Woojin Hamid, Shanawar
Copyright Year	2017
Abstract	Nitrate contamination of surface and groundwater is one of the most serious environmental issues due to its adverse effects on human health and the ecosystem. In this study, novel bimetallic catalysts supported by nanocrystalline beta zeolite (NBeta) were firstly developed for the complete and selective reduction of nitrate to environment-friendly nitrogen. The synthesis of a NBeta support and bimetallic catalysts was confirmed by X-ray diffraction and Fourier transformation infra-red spectroscopy. The morphology of the NBeta support and metal dispersion was confirmed by transmission electron microscopy and scanning electron microscopy with energy dispersive X-ray, which revealed that newly synthesized NBeta consisted of individually separated cubical shaped crystals and that the metals were well dispersed in uniform and closely packed ensembles. The nitrate reduction mechanism on NBeta-supported bimetallic catalysts was also identified by inductively coupled plasma mass spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed reduction, and H2 pulse chemisorption. All catalysts successfully achieved 100% NO3− and NO2− removal. Sn–Pd-NBeta showed the highest reduction kinetics (k = 19.09 × 10−2 min−1) followed by In–Pd-NBeta (k = 2.89 × 10−2 min−1) and Cu–Pd-NBeta (k = 2.31 × 10−2 min−1). However, N2 selectivity was in the order of Cu–Pd-NBeta (92.68%) > In–Pd-NBeta (82.93%) > Sn–Pd-NBeta (80.80%). Characterization of the catalysts revealed that the highest N2 selectivity of Cu–Pd-NBeta was due to the suppression of a deep hydrogenation capacity of Pd by Cu. The NBeta-supported Cu–Pd, In–Pd, and Sn–Pd catalysts also showed a complete NO3− reduction with consistent N2 selectivity in successive and regenerated cycles. The results suggest an eco-friendly catalytic system which can be applied to the optimal ex situ remediation of water and wastewater contaminated with nitrate.
Starting Page	853
Ending Page	866
Page Count	14
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	19
Issue Number	3
Journal	Green Chemistry
DOI	10.1039/c6gc02349e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cu Fourier NBeta Groundwater Ecosystem Zeolite Nitrate Nitrogen X-ray crystallography Infrared spectroscopy Dispersion relation Transmission electron microscopy Scanning electron microscope Inductively coupled plasma mass spectrometry X-ray photoelectron spectroscopy Photoemission spectroscopy Temperature-programmed reduction Chemisorption Hydrogenation Wastewater
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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