Improvements in the N2 selectivity of Pt catalysts in the NO–H2–O2 reaction at low temperatures

An investigation of the surface intermediates of H2-SCR of NO over Pt/H-FER

“…4B). According to literature [17], NH 3 may be significantly produced from NO reduction under this reductive condition, and hence the S N2 calculated by the Eq. (3) under this condition should be considered as the sum of selectivity of NO reduced to N 2 and NH 3 .…”

“…In the past decades, various hydrocarbons [8][9][10][11][12][13][14] have been studied as reductant for the purpose of removing NO x in excess oxygen, which was expressed as HC-SCR, whereas their poor activity and selectivity under low temperature towards the aimed reaction make this technology hardly developed. Recently, hydrogen [15][16][17][18][19][20][21][22] has been proved to be effective reductant for NO x reduction in excess oxygen because of its high activity towards NO reduction and zero emissions of greenhouse gases in the reaction. Recent research works [5][6][7] have revealed that this reaction under industrial conditions is possible and the SCR of NO by H 2 (H 2 -SCR) might be a breakthrough NO x control technology in favor of the NH 3 -SCR in application.…”

“…Since H 2 -SCR could effectively eliminate NO at much lower temperature compared with HC-SCR, it has attracted much attention in recent years [15][16][17][18][19][20][21][22], in particular its reaction mechanism. Two main kinds of reaction mechanism for the reaction have been proposed in the literature.…”

“…Nanba et al [17] [18] was much selective to reduce NO and NO 2 at low temperatures (<100 • C) and the authors have ascribed the high selectivity of H 2 towards NO reduction to NO oxidative adsorption and the nitrate species formation over the catalyst. Costa and Efstathiou [19] have studied the reaction route over Pt/SiO 2 and Pt/La-Ce-Mn-O catalysts by steady state isotopic transient kinetic analysis coupled with temperature programmed surface reaction using on line mass spectroscopy and in situ DRIFTS for the first time.…”

Oxidative Decomposition of N,N'-Dimethylformamide over Pt Catalysts with H2 Addition to the Feed

“…H-ZSM-5 is also regarded to perform as a catalyst to selectively produce N 2 from NH 3 and NOx [6], both of which are intermediate products of DMF. In contrast, the reactants and byproducts hardly adsorbed on basic ZrO 2 [7,8], and thus would be easily released outside of the reaction system. SiO 2 displayed a medium activity between that of H-ZSM-5 and ZrO 2 , probably due to not having either strong acidity or basicity [9].…”