(廊坊師范學(xué)院 化學(xué)與材料科學(xué)學(xué)院，廊坊 065000)
摘 要: 對(duì)共還原法合成的NiZnB粉體進(jìn)行NaOH刻蝕后脫鋅而制得非晶態(tài)NiB納米催化劑(NiB-etch)，考察其對(duì)對(duì)硝基苯酚(4-NP)加氫的催化活性。通過(guò)透射電子顯微鏡、X射線衍射、氮?dú)馕?脫附等溫曲線、電感耦合等離子發(fā)射光譜進(jìn)行材料表征，利用紫外-可見(jiàn)分光光度計(jì)定量分析4-NP催化加氫速率。結(jié)果表明：與常規(guī)NiB催化劑相比，NiB-etch的比表面積增加2.3倍，催化反應(yīng)速率常數(shù)提高2.5倍。另外，對(duì)NiZnB進(jìn)行150 ℃下熱處理，可使NiB-etch催化活性進(jìn)一步提高1.7倍，反應(yīng)速率常數(shù)增至0.93 min-1。
關(guān)鍵字: 對(duì)硝基苯酚；催化加氫；非晶態(tài)催化劑；NiB納米粒子；化學(xué)刻蝕
（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
