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采用浸渍法制备了PT/CE0.75ZR0.25O2催化剂,考察了催化剂对乙醇及CO的氧化活性,并采用18O同位素交换、乙醇程序升温表面反应(C2H5OH-TPSR)、一氧化碳程序升温脱附(CO-TPD)和程序升温还原(H2-TPR)等技术对催化剂进行了表征.结果表明,PT/CE0.75ZR0.25O2催化剂表现出较高的乙醇和CO氧化活性,其催化活性随着PT负载量的增加而提高.当PT负载量为3%时,活性最高.继续增加PT负载量,催化剂活性下降.C2H5OH-TPSR和CO-TPD结果表明,催化剂对乙醇或CO的氧化活性与从催化剂表面脱附出来的CO2量有对应关系,CO2脱附量越大,催化剂活性越高.18O同位素交换结果表明,表面氧交换能力与其氧化活性有一定对应关系,催化剂的表面氧交换能力越高,氧化活性越高.
The catalyst PT / CE0.75ZR0.25O2 was prepared by impregnation method. The oxidative activities of the catalysts for ethanol and CO were investigated. The effects of 18O isotope exchange, C2H5OH-TPSR, CO- (TPD) and temperature-programmed reduction (H2-TPR) were used to characterize the catalysts.The results showed that the catalyst of PT / CE0.75ZR0.25O2 showed higher activity of ethanol and CO oxidation and the catalytic activity of PT / And the activity was the highest when the PT loading was 3% .The PT loading was increased and the activity of the catalyst decreased.The results of C2H5OH-TPSR and CO-TPD showed that the activity of the catalyst for the oxidation of ethanol or CO and the desorption from the catalyst surface The amount of CO2 has a corresponding relationship, the larger the amount of CO2 desorption, the higher the catalyst activity .18O isotope exchange results show that the surface oxygen exchange capacity and its oxidation activity has a certain relationship between the catalyst surface oxygen exchange capacity higher oxidation activity high.