An investigation into the effect of Cs promotion on the catalytic activity of NiO in the direct decomposition of N2O

Abstract

A series of Cs promoted NiO catalysts have been prepared and tested for direct decomposition of N 2 O. These catalysts are characterized by BET surface area, X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed desorption of N 2 O (TPD-N 2 O) and X-ray photo electron spectroscopy (XPS). The Cs promoted NiO catalysts exhibit higher activity for the decomposition of N 2 O compared to bulk NiO. The catalyst with Cs/Ni ratio of 0.1 showed highest activity. The enhancement in catalytic activity of the Cs promoted catalysts is attributed to the change in the electronic properties of NiO. The characterization techniques suggest weakening of Ni-O bond thereby the desorption of oxygen becomes more facile during the reaction. The Cs promoted NiO catalyst is effective at low reaction temperature and also in the presence of oxygen and steam in the feed stream.

Rare Earth-Promoted Nickel Oxide Nanoparticles as Catalysts for N2O Direct Decomposition

“…Highly active catalysts for N2O decomposition was obtained by fine tuning of these two parameters. Pasha et al [23] reported a direct correlation between the low-temperature H2-TPR peak shift of Cs-promoted NiO and its N2O decomposition activity. The activity of RE (Gd, La, Nd, Pr, Sm, Tb, Y)-promoted CuO catalysts was correlated with their ability to enhance CuO reduction [21,22].…”

“…This indicates an overlap of multiple reduction peaks. With the aid of literature data, the lower temperature peak could be assigned to the NiO → NiO1+δ, whereas the higher temperature one could be due to NiO1+δ → Ni 0 transformation [23,41,42] The peak temperatures for the major Ni 2+ reduction of Gd/NiO, La/NiO and Sm/NiO are 374, 368 and 369 °C, respectively. Apparently, the reducibility of the NiO is not improved by RE-oxide addition.…”

N2O Decomposition over Cu–Zn/γ–Al2O3 Catalysts

“…Among various types of abatement technologies, direct catalytic decomposition of N 2 O (N 2 O → N 2 + 1/2O 2 ) is a relatively simple and cost-effective way to remove N 2 O from industrial tail gases, and becomes one of the most attracting methods. A large number of catalysts, such as supported noble metals, pure and mixed oxides, and zeolite-based catalysts have been evaluated for N 2 O decomposition reaction [9][10][11][12][13][14][15][16][17][18][19][20][21]. Among them, noble metal-based catalysts exhibit satisfactory activity at intermediate temperatures [22,23].…”

The effects of alkali metal on structure of manganese oxide supported on SBA-15 for application in the toluene catalytic oxidation

“…Alkali metals have been used as promoters in heterogeneous catalysis in order to improve catalytic activity and durability in many reactions [8][9][10][11]. Pasha et al ascribed the enhancement in the catalytic activity of the Cs promoted catalysts to be the change in the electronic properties of NiO [9].…”

“…Pasha et al ascribed the enhancement in the catalytic activity of the Cs promoted catalysts to be the change in the electronic properties of NiO [9]. The addition of alkali metals, meanwhile, results in the creation and population of new sites with the increased electron density in the system of Pt/TiO 2 [11].…”