Cr掺杂的Co-B非晶态合金的制备及催化硼氢化钠水解制氢
收稿日期: 2019-08-13
网络出版日期: 2020-02-26
基金资助
国家自然科学基金青年科学基金项目(51705450);江苏省自然科学基金青年项目(BK20160474)
Preparation of amorphous Co-Cr-B and catalytic sodium borohydride hydrolysis for hydrogen generation
Received date: 2019-08-13
Online published: 2020-02-26
采用化学还原法制备了三元非晶态Co-Cr-B纳米催化剂。采用透射电镜（TEM）、扫描电镜（SEM）、X射线衍射仪（XRD）等测试方法对催化剂的形貌、结构、成分做了表征。通过排水法进行NaBH4溶液水解产氢反应,测量了催化剂的催化性能。结果表明,当掺杂少量的Cr时,催化剂的粒径明显减小,比表面积明显增大,催化剂的性能提高。过量的Cr会导致出现过多的氧化物和Cr 3+,覆盖了催化剂表面活性位点,降低催化剂的性能。当Cr与Co物质的量比为0.005时,催化剂性能最佳。与纯Co-B相比,其对硼氢化钠水解产氢速率提高了2倍。此外,研究了催化剂用量、NaBH4浓度、反应温度、NaOH浓度等因素对NaBH4溶液水解产氢反应的影响。
陈悦蓉 , 靳惠明 , 俞亮 , 邵阳阳 . Cr掺杂的Co-B非晶态合金的制备及催化硼氢化钠水解制氢[J]. 无机盐工业, 2020 , 52(2) : 91 -96 . DOI: 10.11962/1006-4990.2019-0135
Co-Cr-B amorphous catalysts were synthesized by chemical reduction method.The morphology,structure and composition of the catalyst were characterized by scanning electron microscopy,transmission electron microscopy and X-ray diffraction.The catalytic performance of the catalyst was measured by hydrogen generation from NaBH4 solution hydrolysis. The results showed that the particle size of the catalyst was reduced with the addition of a small amount of Cr.The specific surface area increased significantly,and the performance of the catalyst was improved.However,excessive addition of Cr caused excessive oxides and Cr 3+,covering the surface active sites of the catalyst,which degraded the performance of the catalyst.When the amount-of-substance ratio of Cr to Co was 0.005,the catalyst property was optimal.It showed nearly 2 times higher H2 generation rate than that of pure Co-B catalyst.In addition,the effect of catalyst quantities,NaBH4 concentration,reaction temperature and NaOH concentration on the hydrogen generation from NaBH4 solution hydrolysis were also studied.
Key words： amorphous catalyst; Co-Cr-B; sodium borohydride hydrolysis
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