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The activity and characterization of sol–gel Sn/Al2O3 catalyst for selective catalytic reduction of NOx in the presence of oxygen

“…At the higher temperature, the ratio of NO 2 to NO increased as compared with that at low temperature, at the time the desorption of NO and NO 2 accompanied with O 2 , therefore, it is suggested that the desorption of NO x and O 2 at high temperature due to the chemical desorption, and the desorption of NO x and O 2 was attributed to the decomposition of nitrate (NO 3 1− ) formed on the catalyst surface. But for the SO 2 treated catalyst, the NO x adsorption/desorption was inhibited by the SO 4 2− species covered on the surface of the catalyst, and then caused a decrease of the capacity for the formation of nitrate species (ad-NO 3 1− ), which have been proposed as key intermediates in the NO reduction reaction [27,28]. Fig.…”

“…At least, NO 2 is likely to react more quickly with propene on the surface of the catalyst to form ad-NO 3 1− species that have been proposed as key intermediates in the reaction [4,27,28]. 2 Considering that the actual exhaust contains significant amounts of water vapor and SO 2 , the effects of water vapor and SO 2 on NO reduction over the single step sol-gel 5% Sn/Al 2 O 3 (SG) catalyst for selective catalytic reduction of NO by propene were investigated.…”

“…The conventional three way catalysts shows high effective for NO removal under stoichiometric conditions, but low NO reduction conversion under lean burn conditions. Selective catalytic reduction (SCR) of nitrogen oxides with hydrocarbons is believed to be a possible way to solve this problem, and has been extensively studied [3][4][5].…”

Influence of Preparation Methods of In2O3/Al2O3 Catalyst on Selective Catalytic Reduction of NO by Propene in the Presence of Oxygen

“…Selective catalytic reduction (SCR) of nitrogen oxides is an efficient way to remove NO from lean burn gasoline and diesel exhaust [1,2]. Several precious metal, metal oxide and zeolite catalysts have been reported to efficiently reduce NO.…”

Systematic evaluation of monometallic catalytic materials for lean-burn NOx reduction using combinatorial methods

“…Although great strides have been made in understanding the fundamentals of NO reduction on an abundance of materials, such as the nature of adsorbed species, reaction mechanisms and solid structures (see for example the information chronicled in several excellent review papers [7][8][9][10][11]), this fundamental knowledge did not lend itself to the development of practical catalysts. We believe that one of the major reasons for this lack of progress has been the absence of a systematic and organized data base.…”