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Supports materialization of Pd based catalysts for NO x removal by hydrogen assisted selective catalytic reduction in the presence of oxygen
Author(s) -
Patel Vivek Kumar,
Sharma Sweta
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000756
Subject(s) - bimetallic strip , catalysis , x ray photoelectron spectroscopy , temperature programmed reduction , raman spectroscopy , metal , selectivity , transmission electron microscopy , hydrogen , chemistry , nuclear chemistry , inorganic chemistry , materials science , chemical engineering , nanotechnology , organic chemistry , physics , optics , engineering
The Pt and Pd based bimetallic catalyst are developed to address the NO x reduction activity. For this, a series of supports containing three different amounts of CeO 2 −MgO (9 : 1, 3 : 1, and 3 : 2) are prepared by the co‐precipitation method, followed by impregnation of Pd metal precursors. The physicochemical properties of the catalytic system are investigated using various techniques such as Brunauer‐Emmett‐Teller (BET), X‐ray Diffraction (XRD), X‐ray photoelectron spectroscopy, Transmission Electron Microscopy (TEM), Raman spectroscopy, and H 2 ‐TPR. Among all, Pd/CeO 2 −MgO (3 : 1) gave the best NO x reduction activity. Furthermore, the effects of hydrogen concentration (0.2–0.8 vol %) on NO x reduction were tested. It was found that 0.8 vol % of H 2 shows the highest NO x conversion. Subsequently, the successive impregnation of Pt metal over Pd based catalyst enhanced the catalytic properties. The bimetallic Pt−Pd/CeO 2 −MgO (3 : 1) catalyst showed an 89 % NO x reduction with about 97 % N 2 selectivity in broad temperature windows (100–300 °C).