非晶态NiB纳米催化剂的制备及其对对硝基苯酚加氢的催化活性  

Preparation of amorphous NiB nanocatalysts and its catalytic activity for hydrogenation of 4-nitrophenol

作　　者：魏磊 马麦霞[1] 王东升[1] 卢艳红[1] 张素玲[1] 王茜 WEI Lei;MA Mai-xia;WANG Dong-sheng;LU Yan-hong;ZHANG Su-ling;WANG Qian(College of Chemistry and Materials Science,Langfang Normal University,Langfang 065000,China)

机构地区：[1]廊坊师范学院化学与材料科学学院

出　　处：《中国有色金属学报》2019年第5期1118-1124,共7页The Chinese Journal of Nonferrous Metals

基　　金：河北省教育厅资助科研项目(BJ2016044);河北省自然科学基金资助项目(B2017408042)~~

摘　　要：对共还原法合成的NiZnB粉体进行NaOH刻蚀后脱锌而制得非晶态NiB纳米催化剂(NiB-etch),考察其对对硝基苯酚(4-NP)加氢的催化活性。通过透射电子显微镜、X射线衍射、氮气吸/脱附等温曲线、电感耦合等离子发射光谱进行材料表征,利用紫外可见分光光度计定量分析4-NP催化加氢速率。结果表明:与常规NiB催化剂相比,NiB-etch的比表面积增加2.3倍,催化反应速率常数提高2.5倍。另外,对NiZnB进行150℃下热处理,可使NiB-etch催化活性进一步提高1.7倍,反应速率常数增至0.93 min^-1。NiZnB powders were synthesized by co-reduction method,and the amorphous NiB nanocatalysts(denoted as NiB-etch)were achieved by etching the NiZnB with sodium hydroxide for catalytic hydrogenation of 4-nitrophenol(4-NP).For catalysts characterization,the transmission electron microscope(TEM),X-ray diffraction(XRD),N2 adsorption/desorption isotherms and inductive coupled plasma emission spectrometer(ICP-AES)were applied,respectively.The ultraviolet-visible spectrophotometer(UV-vis)was employed to quantificationally measure the conversion rate of 4-NP.The results indicate that the specific surface area and apparent reaction rate constant are 2.3 and 2.5 times higher than those of conventional NiB catalyst,respectively.By treating NiZnB at 150℃,the catalytic activity of NiB-etch measured is 1.7 times higher than that of untreated sample,leading to an apparent rate constant up to 0.93 min^-1.

关 键 词：对硝基苯酚 催化加氢 非晶态催化剂 NiB纳米粒子 化学刻蚀 

分 类 号：O643[理学—物理化学]