氧化铈和铈锆固溶体对Pd催化剂抗硫性能影响的研究  

Effect of CeO_2 and Ce_(0.6)Zr_(0.4)O_2 solid solution on the sulfur tolerance of Pd-based catalysts

作　　者：薛彬[1] 何洪[1] 戴洪兴[1] 訾学红[1] 王亮[1] 王振阳[1] 

机构地区：[1]北京工业大学环境与能源工程学院化学化工系,北京100022

出　　处：《工业催化》2007年第9期19-24,共6页Industrial Catalysis

基　　金：北京市自然基金项目(3061001);国家高技术研究发展计划(2006AA06Z347);北京市属市管高等学校学术创新团队资助计划

摘　　要：采用等体积浸渍法制备了质量分数为1%Pd/γ-Al2O3、1%Pd/10%CeO2/γ-Al2O3以及1%Pd/10%Ce0.6Zr0.4O2/γ-Al2O3催化剂,研究了CeO2和Ce0.6Zr0.4O2固溶体对Pd催化剂抗硫性能的影响。利用XRD和XPS技术表征了催化剂的固相结构、表面元素组成和反应后催化剂中硫物种(或表面硫酸盐)的存在形态。利用SO2-TPD研究了SO2在催化剂上的吸附和脱附行为。实验结果表明,在催化剂载体中引入CeO2和Ce0.6Zr0.4O2降低了催化剂起燃活性;SO2在Pd/Ce0.6Zr0.4O2/γ-Al2O3催化剂表面上发生化学反应生成Zr(SO4)2,其热稳定性大于在Pd/γ-Al2O3和Pd/CeO2/γ-Al2O3催化剂表面上的硫酸盐或硫酸盐物种。1% Pd/γ-Al2O3,1% Pd/10% CeO2/γ-Al2O3 and 1% Pd/10% Ce0.6Zr0.4O2/γ-Al2O3 catalysts were prepared by incipient wetness impregnation method. Effects of CeO2 and Ce0.6Zr0.4O2 solid solution on tolerance to sulfur of Pd-based catalyst were investigated. The solid structure, surface elemental composition and state of sulfur species （or surface sulfates ） in the catalysts after reaction were characterized using X-ray powder diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. adsorption/desorption of SO2 on the catalysts were studied using SO2 temperature-programmed desorption （SO2-TPD）. The results showed that doping of CeO2 and Ce0.6Zr0.4O2 lowered the combustion-initiating temperature; Zr（ SO4 ）2 formed on 1% Pd/10% Ce0.6Zr0.4O2γ-Al2O3 catalyst, whose thermal stability was higher than sulfates formed on 1% Pd/10%CeO2/γ-Al2O3 and 1% Pd/10 % Ce0.6Zr0.4O2/γ-Al2O3.

关 键 词：PD催化剂 甲烷催化燃烧 硫中毒 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程] TQ426.94[化学工程]