(廊坊师范学院 化学与材料科学学院，廊坊 065000)
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。
关键字: 对硝基苯酚；催化加氢；非晶态催化剂；NiB纳米粒子；化学刻蚀
（College of Chemistry and Materials Science, Langfang Normal University, Langfang 065000, China）
Abstract: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.
Key words: 4-nitrophenol; catalytic hydrogenation; amorphous catalyst; NiB nanoparticle; chemical etching
