摘要
采用化学共还原法制备了聚乙烯吡咯烷酮(PVP)稳定的Pt/Ni双金属纳米溶胶.采用紫外-可见光谱(UV-Vis)、透射电子显微镜(TEM)对所合成的Pt/Ni双金属纳米溶胶进行了表征,并系统研究了PVP用量、还原剂用量和浓度、双金属比例对该双金属纳米溶胶催化剂催化性能的影响.结果表明,所制备的双金属纳米溶胶的平均粒径在2.0 nm左右,Pt/Ni双金属纳米溶胶的催化活性比Pt及Ni单金属纳米溶胶的高,当Pt/Ni摩尔比为1∶4时,纳米溶胶的催化活性最高,其活性值为16640 mol H2·mol-1Pt·h-1.所制备的Pt/Ni双金属纳米溶胶催化剂具有很好的耐久性,5次催化实验后该催化剂仍保持较高的催化活性.该双金属纳米溶胶催化NaBH4水解反应的活化能为48 kJ/mol.
The hydrolytic dehydrogenation of sodium borohydride is a promising integrated technology as a way of hydrogen storage and hydrogen production. This paper reports a facile route for synthesizing the PVP stabi- lized Pt/Ni bimetallic nanosol by a chemical co-reduction process. The morphology, size, structure and com- position of the resultant Pt/Ni bimetallic nanosol were characterized by transmission electron microscopy （TEM） and ultraviolet-visible （UV-Vis） spectrum. The effects of PVP dosage, reducing agent dosage, and metal composition in the hydrolysis of NaBH4 were studied. The results indicate that the prepared Pt/Ni bime- tallic nanosol have an average size of about 2.0 nm. The catalytic activities of the Pt/Ni bimetallic nanosol are superior to monometallic Pt or monometallic Ni, among which especially the Pt20Ni80 bimetallic nanosol shows the highest catalytic activity with a hydrogen generation rate of 16640 mo1H2 molp- h-1 at 303 K and an activa- tion energy of 48 kJ/mol. In addition, the prepared Pt/Ni bimetallic nanosol has a good catalytic stability, and even keeps a higher catalytic activity after five runs test.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期2377-2382,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:51272188)
湖北省“楚天学者”特聘教授科研启动资金(批准号:010336)
武汉科技大学大学生科技创新基金(批准号:11ZRA013)资助
关键词
PT
Ni双金属
纳米溶胶
硼氢化钠
制氢
催化活性
Pt/Ni bimetal
Nanosol
NaBH4
Hydrogen generation
Catalytic activity （Ed. ： V, Z）
