Raney Ni催化碱性硼氢化钠溶液水解制氢

Raney Ni催化碱性硼氢化钠溶液水解制氢
魏磊;马麦霞;付君宇;高静;董晓龙;魏丕叶
【期刊名称】《化工进展》
【年(卷),期】2017(036)012
【摘要】以NiAl合金粉末为原料,经浓碱溶液处理后制得Raney Ni催化剂,并用于催化碱性硼氢化钠溶液水解制氢.通过场发射扫描电子显微镜和氮气吸附/脱附法对催化剂微观物理结构进行表征,考察了硼氢化钠溶液组成、反应温度、催化剂用量和循环使用对体系产氢速率的影响.研究结果表明,当硼氢化钠和氢氧化钠质量分数分别为15%和10%时,产氢速率达到1085mL/(min·g)(25℃);相应表观活化能为38.6kJ/mol;催化剂用量与单位时间内氢产量成线性关系.循环测试结果表明,经过4次重复使用后,产氢速率降低78%,其原因主要在于硼化物的累积和镍的氧化.%In this work, Raney Ni catalyst was prepared by treating the NiAl alloy powder with alkaline solution. The obtained catalyst was then used for the catalytic hydrolysis of sodium borohydride (NaBH4)solution toward hydrogen generation. Field-emission scanning electron microscopy and nitrogen absorption/desorption method were carried out to characterize the microstructure of the catalyst. Effects of the reaction solution composition, reaction temperature, catalyst amount and reusing operation on the hydrogen generation rate(HGR)were investigated. The results showed that when the concentration of NaBH4 and NaOH was 15% and 10%, respectively, HGR was as high as 1085mL/(min·g) at 25℃ and the apparent activation energy was measured to be 38.6kJ/mol. A good linear
relationship was established between the hydrogen volume per minute and the catalyst amount. The HGR was decreased by 78% after recycled for four times, which could be attributed to the accumulation of boron compounds and the oxidation of nickel.
【总页数】6页(P4462-4467)
【作者】魏磊;马麦霞;付君宇;高静;董晓龙;魏丕叶
【作者单位】廊坊师范学院化学与材料科学学院,河北廊坊 065000;廊坊师范学院化学与材料科学学院,河北廊坊 065000;廊坊师范学院化学与材料科学学院,河北廊坊 065000;廊坊师范学院化学与材料科学学院,河北廊坊 065000;廊坊师范学院化学与材料科学学院,河北廊坊 065000;廊坊师范学院化学与材料科学学院,河北廊坊065000
【正文语种】中文
【中图分类】TQ116.2
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