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采用化学共还原法制备了聚乙烯吡咯烷酮(PVP)稳定的Pt/Co双金属纳米溶胶,利用UV-Vis、TEM等对所合成的Pt/Co双金属纳米溶胶进行了表征,并系统研究了PVP用量,还原剂用量,双金属比例对该溶胶型纳米双金属催化剂活性的影响。结果表明:所制备的Pt/Co双金属纳米溶胶的平均粒径在2~3 nm之间,大部分双金属纳米溶胶催化剂催化NaBH4制氢的活性都优于单金属Pt和Co纳米溶胶,Pt10Co90双金属纳米溶胶的催化活性最高,其催化NaBH4制取氢气的活性可以达到8800 mol-H2·mol-催化剂-1·h-1,该双金属纳米溶胶催化NaBH4水解反应的活化能为61.8 kJ/mol。所制备的Pt/Co双金属纳米溶胶催化剂具有很好的稳定性,即使在4次催化试验后该催化剂仍然保持着较高的催化活性。
Polyvinylpyrrolidone (PVP) -based Pt / Co bimetallic nano-sols were prepared by chemical reduction method. The synthesized Pt / Co bimetallic nano-sols were characterized by UV-Vis and TEM. The effects of PVP The effect of dosage, amount of reductant and bimetallic ratio on the activity of the sol-type nano-bimetallic catalyst. The results show that the average particle diameter of the prepared Pt / Co bimetallic nano-sols is between 2 and 3 nm. Most of the bimetallic nano-sol catalysts catalyze the hydrogen production activity of NaBH4 to be superior to that of the single metal Pt and Co nano-sols. The Pt10Co90 The bimetallic nanosol has the highest catalytic activity. The catalytic activity of NaBH4 for the hydrogen production can reach 8800 mol-H2 mol-1-h-1. The activation energy of the bimetallic nanosolysis-catalyzed hydrolysis of NaBH4 is 61.8 kJ / mol. The prepared Pt / Co bimetallic nanosized catalyst has good stability, and the catalyst retains high catalytic activity even after four catalytic tests.