Pd - Cu/凹凸棒石黏土催化剂催化CO氧化性能

以凹凸棒石黏土(APT)作载体,采用浸渍法制备双金属催化剂Pd - Cu/APT、单金属催化剂Pd/APT和Cu/APT,在连续流动微反装置上考察催化剂的CO催化氧化活性,采用N2物理吸附/脱附、X射线粉末衍射和程序升温还原/脱附等手段对催化剂进行表征.结果表明,Pd - Cu/APT催化剂中Cu主要以CuC1形式存在...

Catalytic performance of Pd-Cu/attapulgite clay catalyst for CO oxidation

Using attapulgite clay（APT） as the support,the bimetallic Pd-Cu/APT catalyst, monometallic Pd/APT and Cu/APT catalysts were prepared by wet impregnation method. The catalytic activities of the catalysts for CO oxidation were investigated in a fixed-bed continuous flow reactor and characterized by Nz physisorption, XRD, I-I2-TPR and NH3-TPD. The result of XRD showed that Cu species in Pd-Cu/APT catalyst existed mainly in the form of CuC1 phase. There existed obvious interaction between Cu species and highly dispersed Pd species in Pd-Cu/APT catalyst. The TPR results indicated that the reduction tem- perature of Cu species were reduced due to the stronger interaction between Pd and Cu. NH3-TPD charac- terization showed that surface acidity of the catalyst was enhanced after the pretreatment of water vapor. As a result, the catalyst exhibited excellent performance for CO oxidation. CO conversion of 90% on Pd-Cu/ APT catalyst was attained under the reaction condition of 0.5vo1% CO, GHSV 6 000 h -~ ,3.3vo1% water vapor and room temperature.