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以预处理的活性炭为载体,采用浸渍还原法制备出Pd基阳极催化剂,主要考察了活性炭预处理、金属前驱体加入顺序对催化剂的影响。结果表明:通过利用HNO_3溶液对活性炭进行处理,可以提高催化剂的负载量,在电化学测试中C2H5OH氧化峰值是未处理活性炭为载体催化剂的2.04倍。此方案可成功合成出粒径达到3.4nm的催化剂。另外利用分布还原法制备的催化剂,可以实现活性炭上催化剂的高负载量和更小的粒径尺寸。
Pd-based anode catalysts were prepared by impregnation-reduction method using pretreated activated carbon as carrier. The effects of pretreatment with activated carbon and addition of metal precursors on the catalysts were investigated. The results show that the catalyst loading can be increased by treating activated carbon with HNO3 solution. The peak of oxidation of C2H5OH in electrochemical test is 2.04 times of that of untreated activated carbon as carrier catalyst. This scheme can successfully synthesize a catalyst with a particle size of 3.4nm. In addition, the catalyst prepared by the distributed reduction method can realize the high loading of the catalyst on the activated carbon and the smaller particle size.