摘要
采用化学镀法在堇青石蜂窝陶瓷基体上制备了Pd基无涂层整体式催化剂Pd/cord,并对其在甲苯催化燃烧净化反应中的催化性能进行了研究。结果表明,Pd/cord催化剂在钯负载量较低(如为0.24%)时,即可使甲苯从201℃起燃后,突跃到226℃完全转化,表现出良好的甲苯催化燃烧净化性能。该类催化剂在空速6 000 h-1～40 000 h-1和甲苯进样浓度0.5 g/m3～8.0 g/m3表现出良好的适用性。105 h稳定性实验也表明,Pd/cord催化剂具有很好的催化反应稳定性,甲苯转化率始终保持在97%以上。对该类催化剂进行SEM、XRD和H2-TPR表征,结果表明,仅在钯负载量为0.24%时,Pd/cord催化剂上活性组分PdO颗粒的粒径较小且大小均一,在堇青石基体表面分散均匀,无团聚和多层重叠现象。
A new Pd-based monolithic catalyst on cordierite honeycomb ceramics substrate without coating（Pd/cord） was prepared via electroless plating.The results of activity tests for catalytic combustion of toluene showedthat Pd/cord catalysts with low Pd loading had good catalytic activities： toluene could light off at 201 ℃,thenleap to 226 ℃ to burn out on Pd/cord catalyst with 0.24% Pd loading.And Pd/cord catalyst was also suitablefor toluene catalytic combustion when space velocities and feed toluene concentrations varied in 6 000 h-1 ～40 000 h-1 and 0.5 g /m3 ～8.0 g /m3 respectively.During the 105 h stability test of Pd/cord catalyst,the tolueneconversion was kept above 97%,which indicated that this catalyst possessed good catalytic stability.Thescanning electron microscope（SEM）,X-ray diffraction（XRD） and temperature programmed reduction inhydrogen（H2-TPR） characterizations showed that the sizes of PdO crystal particles in Pd/cord catalyst when Pdloading was 0.24%,PdO particles were also equably distributed on the surface of cordierite substrate with nooverlapping aggregation phenomenon.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2011年第9期712-716,共5页
Journal of Fuel Chemistry and Technology
基金
广州市科技计划项目(2010Z1-E061)
关键词
化学镀
Pd基
甲苯
催化燃烧
electroless plating
Pd-based
toluene
catalytic combustion
