碳载体处理对Pd催化氧化甲酸的影响

Effect of treatment of carbon black on the behavior of formic acid oxidation at carbon supported Pd catalyst

采用饱和Co盐浸渍碳黑,然后高温热处理。发现处理后的碳黑微孔体积减少,介孔体积增加,更适于作为催化剂的载体。用处理后的碳黑制备的碳载Pd催化剂比未处理的碳黑做载体制备的催化剂对甲酸氧化具有更高的电催化活性。XRD结果可以看出,经Co盐浸渍处理过的碳黑中含有一定量的Co,有助于金属Pd在碳黑表面的分散,增加活性金属的电化学比表面,提高催化剂的催化活性。

The treatment of carbon black is in the method of impregnation and followed heat treatment.The treated carbon black has more volume of mesopores and less volume of micropores compared with the untreated carbon black,which is fit as support.The Pd/C catalysts with treated carbon black as support showed higher activity than that with untreated carbon black as support.XRD result shows that metal Co exited in the treated carbon black which can help the dispersion of Pd on the surface of the carbon and then enhance the activity of the catalyst for formic acid oxidation