Cu/ZrO_2/S_2O_8^(2-)/γ-Al_2O_3固体酸催化剂制备与催化选择还原NO性能  

Preparation of Cu/ZrO_2/S_2O^(2-)_8/γ-Al_2O_3 Solid Acid Catalyst and Its Catalytic Activity to Selective Reduction of NO

作　　者：郭锡坤[1] 王小明[1] 

机构地区：[1]汕头大学化学系,汕头515063

出　　处：《环境科学》2008年第6期1737-1742,共6页Environmental Science

基　　金：广东省科技计划项目(2006B36702003);汕头大学研究与发展项目(130-512042)

摘　　要：以拟薄水铝石焙烧得到的γ-Al2O3为载体,分步浸渍负载(NH4)2S2O8、ZrOCl2和Cu(NO3)2,制成Cu/ZrO2/S2O28-/γ-Al2O3固体酸催化剂.考察了Cu/ZrO2/S2O82-/γ-Al2O3在富氧条件下对C3H6选择还原NO的催化性能,并借助SEM、XRD、Py-IR和TPR等表征方法研究了它的结构和性能的关系.性能的实验结果表明,Cu/ZrO2/S2O28-/γ-Al2O3在无水条件下能使NO的最大转化率达到82.9%,在有10%水蒸气存在条件下仍能使NO的最大转化率达到80.2%.表征测试的结果表明,S2O82-和ZrO2能够抑制γ-Al2O3颗粒之间的烧结及CuAl2O4尖晶石相的生成,同时促使催化剂表面新酸性中心(B酸)的形成及总酸量的增加,另外ZrO2还能提高Cu物种的还原性,从而有效地改善了催化剂的催化活性和水热稳定性.Cu/ZrO2/S2O8^2-/γ-Al2O3 solid acid catalyst was prepared by loading of（NH4）2S2O8,ZrOCl2 and Cu（NO3）2 onto γ-Al2O3 step by step,which was obtained from calcining of pseudoboehmite.The catalytic property of Cu/ZrO2/S2O8^2-/γ-Al2O3 on the selective reduction of NO by C3H6 in excess oxygen was investigated.The relationship between the structure and the catalytic property of Cu/ZrO2/S2O8^2-/γ-Al2O3 catalyst was also explored by means of SEM,XRD,Py-IR and TPR.The experimental results of catalytic activity of the title catalyst indicated that the maximum conversion rate of NO could reach 82.9% in the absence of water and was up to 80.2% even in the presence of 10% water vapor.The results of the structural characterization toward the catalyst showed that S2O8^2- and ZrO2 could restrain the sinteration of γ-Al2O3 particles and the formation of CuAl2O4 spinelle,and also facilitate the formation of new acidic sites（Bronsted acid） and the enhance of the acidity on the surface of the catalyst.In addition, ZrO2 could increase the reducibility of Cu on the catalyst.Consequently,the catalytic activity and hydrothermal stability of the catalyst were improved effectively.

关 键 词：Cu/ZrO2/S2O8^2-/γ-Al2O3 固体酸 选择还原 NO 

分 类 号：X701.7[环境科学与工程—环境工程]