摘要
通过水热合成法合成了有机配体不同的前驱体铈基金属-有机骨架,经过400℃煅烧得到CeO_(2)催化剂用于催化氧化甲苯,并研究了催化剂的性能。结果表明,在反应温度为180~260℃、质量空速为60000mL/(g·h)条件下,催化剂活性顺序为CeO_(2)-B>CeO_(2)-M>CeO_(2)-A(B、M、A分别是有机配体4,4′-联吡啶、2-甲基咪唑、2-氨基对苯二甲酸的英文首字母)。CeO_(2)-B在215℃对甲苯的降解率达到92.9%,在30h稳定性测试中保持优异的催化性能,其优异的催化活性得益于较大的比表面积(126.72m^(2)/g)、孔容(0.19cm^(3)/g)、平均孔径(5.44nm)、较高的Ce^(3+)含量(19.97%)和表面化学吸附氧含量(43.63%)。X射线衍射、全自动比表面积分析仪、扫描电子显微镜、氢气-程序升温还原、X射线光电子能谱等表征证明,有机配体会影响催化剂的比表面积、孔容、孔径和粒径等物理性质。
The cerium-metal-organic frameworks(Ce-MOFs),a precursor with different organic ligands,was synthesized by hydrothermal synthesis,and the CeO_(2) catalysts for catalytic oxidation of toluene were obtained by calcination at 400℃,and the properties of the catalyst were studied.The results showed that under the conditions of the reaction temperature of 180~260℃ and the mass airspeed of 60000mL/(g·h),the order of activity of the catalysts was:CeO_(2)-B>CeO_(2)-M>CeO_(2)-A(B,M and A were the initials of organic ligands 4,4′-bipyridine,2-methylimidazole,and 2-aminoterephthalic acid,respectively).CeO_(2)-B achieved a toluene degradation rate of 92.9% at 215℃ and maintained excellent catalytic performance in the 30h stability test.Its outstanding catalytic activity benefited from the large specific surface area(126.72m^(2)/g),pore volume(0.19cm^(3)/g),average pore size(5.44nm),the higher concentrations of Ce^(3+)(19.97%)and surface chemisorption oxygen O ads(43.63%).XRD,BET,SEM,H_(2)-TPR,XPS and other characterizations proved that organic ligands affected the physical properties of catalysts such as specific surface area,pore volume,pore size and particle size.
作者
郜晨旭
魏伟东
罗涛
李换英
白书立
Gao Chenxu;Wei Weidong;Luo Tao;Li Huanying;Bai Shuli(School of Biotechnology and Health Sciences,Wuyi University,Jiangmen 529000)
出处
《化工新型材料》
CAS
CSCD
北大核心
2024年第2期195-200,共6页
New Chemical Materials
基金
国家自然科学基金(21006065)。
