Use of a calcined Ni(II), Al(lll) layered double hydroxide for the reduction of nitric oxide in the presence of methane and oxygen

摘要

The elimination of environmental pollutants, particularly NO.V, has drawn much attention towards their catalytic reduction to nitrogen and oxygen [1-3]. There is a need for the preparation of new generations of NO, reduction catalysts [4], The discovery by Iwamoto and co-workers [5,6] that copper-exchanged, zeolites could be used for the selective reduction of nitric oxide by hydrocarbons in an oxidizing atmosphere, has drawn attention to the use of hydrocarbons as a reductant. NO.V reduction by methane in the presence of oxygen using Co-ZSM5 as catalyst at 400 °C was reported by Li and Armor [7, 8]. Recently, the same group has reported [9] that calcined hydrota I ci te-1 ike materials display sustained life at temperatures as high as 670 °C in an oxygen-rich atmosphere during the N2O decomposition. This was considered to be an improvement on the previously active Co-ZSM5. Calcined Mg(H), Fe(III) layered double hydroxides (LDH) have shown activity towards the direct decomposition of nitric oxide [10]. In this letter, we report the decomposition of nitric oxide over a calcined Ni(II), Al(III) LDH at 400 °C, in the presence of methane and of a certain amount of oxygen.