Influence of Sulfation on the Catalytic Activity of Ni-ZrO2 for NO Reduction with Propane in Excess Oxygen
Selective catalytic reduction (SCR) of nitric oxide with propane in excess oxygen was investigated on Ni-ZrO2 (NZ) and sulfated Ni-ZrO2 (SNZ), prepared by coprecipitation from a mixture of nickel nitrate-zirconium oxychloride followed by modifying with (NH4)2SO4. It was found that sulfated Ni-ZrO2catalyst showed higher activity for the SCR of NO with propane than that of Ni-ZrO2. The structural and surface properties of catalysts were studied by XRD, BET, SEM and FT-IR of pyridine adsorption. The experimental results indicated that the modification of (NH4)2SO4 resulted in the generation of strong Bronsted and Lewis acid sites and promoted the dispersion of the Ni species, which could lead to higher NO conversion and propane efficiency in NO reduction.
作 者： Shujuan Zhang Landong Li Fuxiang Zhang Naijia Guan 作者单位： Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071, China 刊 名： 天然气化学（英文版） ISTIC SCI 英文刊名： JOURNAL OF NATURAL GAS CHEMISTRY 年，卷(期)： 2005 14(4) 分类号： O6 关键词： sulfation Ni-ZrO2 coprecipitation SCR NO propane