Enhanced performances of N2O destruction in the presence of CO over the mixed metal oxide catalysts derived from hydrotalcite-type precursors

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

“…Calcined Co-Mn-Al hydrotalcites were studied by Obalova et al [18][19][20], who proposed the optimal method for synthesis of effective catalysts and reported high activity of these oxide systems in the presence of O 2 and NO x . Chang et al [21] reported high activity of calcined Co-Al hydrotalcites containing additionally rhodium, palladium, or cerium in the process of N 2 O decomposition and reduction by carbon monoxide. Kannan and Swamy [22] reported that calcined Co-Al hydrotalcites obtained by supersaturation method are more active in N 2 O decomposition than the samples produced by sequential saturation method.…”

NO presence effects on the reduction of N2O by CO over Al–Pd–Co oxide catalyst

“…However, Chang et al [15], having obtained the full conversion of N 2 O by CO over MMO catalyst at 200 8C, attributed the fast reaction to surface reaction of N 2 O with adsorbed CO rather than scavenging of adsorbed oxygen. Here, the reduction mechanisms of NO and N 2 O with CO can be formulated as follows:…”

“…However, according to Chang et al [15], the reduction progresses very fast with CO over MMO catalyst rather through Reaction (13) at temperatures as low as 200 8C. Reaction (1) fundamentally was known not to occur at the temperatures below 200 8C, so that no elemental oxygen can be produced.…”

“…Meanwhile, Chang et al [15] achieved full conversion efficiency of N 2 O at the temperature of 200 8C over several compositions of MMO catalysts in the presence of CO. The MMO catalysts were made from hydrotalcite-type precursors containing the precious metals of Rh or Pd.…”

Effect of electrolytes and soil minerals on nitrous oxide (N2O) hydrate formation kinetics

“…The anthropogenic N 2 O now causing environmental problems mainly comes from agricultural soil management (74%), stationary combustion (6%), chemical (adipic and nitric acid) production (5%), transportation (5%), and waste management (5%) (US EPA, 2013). The catalytic reduction of N 2 O and the high temperature thermal decomposition process have been widely studied (Granger et al, 2002;Perez-Ramirez et al, 2004;Santhosh Kumar et al, 2005;Chang et al, 2006;Chang, 2008) with the goal of treating N 2 O emissions. However, the relevant technologies have revealed limitations (e.g., high processing cost, high energy consumption, and low removal efficiency) that prevent them being applied to treat the significant amount of N 2 O now present and further increased (Chang, 2008).…”