摘要
用浸渍法制备了Pd/γ-Al2O3和Pd/Ce0.65Zr0.35O22种甲醇分解催化剂。采用XRD,NH3-TPD(NH3-Temperature-Programmed Desorption),XPS及H2-TPR(H2-Temperature-Programmed-Redution)等手段对2种催化剂的结构和性能进行表征,并考察了催化剂上甲醇低温分解的活性。结果表明,Pd/Ce0.65Zr0.35O2催化剂具有较弱的表面酸性及良好的低温还原性能;XPS结果表明2种催化剂中的Pd均以氧化态形式存在,并且Pd在Ce0.65Zr0.35O2固溶体上呈高度分散状态,Pd与Ce间具有较强的相互作用。结合活性考察可知,Pd+的存在有利于甲醇的分解。Pd/Ce0.65Zr0.35O2催化剂具有高的催化活性,220℃时甲醇转化率接近100%。
Two kinds of palladium methanol decomposition catalysts were prepared by immersion method with γ-Al2O3 and Ce0.65Zr0.3502 as supports, respectively. XRD, XPS, HE-TPR （HE-Temperature-Programmed-Redution） and NHa-TPD （NH3-Temperature- Programmed Desorption） techniques were used to study the microstructure and performance of catalyst samples and the activity of methanol low-temperature decomposition for the catalysts was also investigated. Testing results show that the Pd/Ce0.65Zr0.3502 catalyst possesses weak surface acidity and good low-temperature reducibility. XPS results confirm that palladium of the two catalysts exist as oxidation state. Combining with catalytic activity, it can be known that Pd~ is advantageous in the methanol decomposition. High dispersion of palladium in ceria-zirconia solid solution and strong interaction between Pd and supports can decrease activation energy which results in high catalytic activity for methanol decomposition. The conversion of methanol nearly achieved 100% at 220℃ for Pd/Ce0.65Zr0.3502.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第3期519-522,共4页
Rare Metal Materials and Engineering
基金
国家"863"计划项目(2006AA062347)
