摘要
采用混胶法和机械混合等方法制备了Pd质量分数为1%的Pd/γ-Al2O3-TiO2催化剂,并对其催化活性、影响条件进行了考察。结果说明,由混胶法制备的Pd/γ-Al2O3-TiO2催化剂对乙醇和乙醛的完全氧化表现出优异的催化性能,其活性明显高于单一载体催化剂Pd/TiO2和Pd/Al2O3,150℃时乙醇和乙醛的转化率分别达到98.9%和98.5%。在较宽温度范围内和高空速条件下表现出良好的稳定性。同时运用XRD、TEM和FT-IR等技术对催化剂进行了表征。结果表明,在Pd/γ-Al2O3-TiO2催化剂中Al2O3与TiO2之间存在着较强的相互作用,使γ-Al2O3-TiO2的比表面积和孔容积均调变到一个适中的数值,同时在催化剂表面Al2O3参与形成了有利于其催化活性的表面结构。
Pd/γ-Al2O3-TiO2 catalysts with 1% palladium loading were prepared by mixed sol-gel and mechanic mixing methods. Their activity for complete oxidation of ethanol and acetaldehyde was tested. The results showed that Pd/γ-Al2O3-TiO2 catalyst prepared by mixed sol-gel method is more active than Pd/TiO2 and Pd/Al2O3 separately for simultaneously oxidation of ethanol and acetaldehyde. The conversions of ethanol and acetaldehyde over Pd/γ-Al2O3-TiO2 at 150 ℃ were 98.9% and 98.5% , respectively; the catalyst also shows a good stability under these conditions. The bulk phase and surface characterizations like XRD, SEM and FT-IR showed that there may be a strong interaction between γ-Al2O3 and TiO2 on Pd/γ-Al2O3-TiO2, which brings on a moderate specific surface area and pore volume. γ-Al2O3 may take part in the formation of catalyst surface structure, which may be favorable for the catalytic oxidation of ethanol and acetaldehyde.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2009年第1期71-76,共6页
Journal of Fuel Chemistry and Technology
基金
国家重点基础研究发展规划(973计划,2005CB221204)
山西省归国留学人员项目(2005-16)
