摘要
利用浸渍法对制备的介孔Nb_(2)O_(5)进行了硼酸掺杂改性,并对制备的催化剂进行了XRD、N 2吸脱附和11B固体NMR表征。结果表明掺杂的硼酸被均匀负载在了多孔Nb_(2)O_(5)表面,生成了内层的四配位硼和外层的三配位硼。将制备的样品用于纯水中多相催化葡萄糖制HMF,考察了反应时间、温度和硼酸负载量对催化反应活性和选择性的影响,结果表明,对Nb_(2)O_(5)进行硼酸改性可以提高催化活性。随着硼酸负载量的增加,酸性先增强后减弱,HMF选择性先升高后降低,中等强度的酸性最利于葡萄糖生成HMF。
Mesoporous Nb_(2)O_(5) was modified by boric acid doping using the impregnation method.The prepared catalysts were characterized by XRD,N 2 adsorption and desorption and 11B solid-state NMR.The results showed that the doped boric acid was uniformly loaded on the surface of the porous Nb_(2)O_(5),producing tetra-coordinated boron in the inner layer and tri-coordinated boron in the outer layer.The prepared samples were used in the catalytic conversion of glucose to HMF in pure water,and the effects of reaction time,temperature and boric acid loading on the catalytic reaction activity and selectivity were investigated,and the results showed that the modification of Nb_(2)O_(5) with boric acid could improve the catalytic activity.With the increase of boric acid loading,the acidity enhanced and then weakened,the HMF selectivity increased and then decreased,and the medium strength acidity was most favorable for the generation of HMF from glucose.
作者
孙涵
李元元
申万岭
Sun Han;Li Yuanyuan;Shen Wanling(College of Chemistry and Chemical Engineering,Henan University of Technology,Zhengzhou 450001,China)
出处
《山东化工》
CAS
2023年第8期64-67,共4页
Shandong Chemical Industry
