摘要
等离子体改性是提高催化材料性能的有效途径。利用水热法合成了Co_(2)(OH)_(2)CO_(3)前驱体,通过氧气低温等离子体技术,制备了表面改性的Co_(3)O_(4)催化剂(Co_(3)O_(4)-P),并对其进行了XRD、O_(2)-TPD、H2-TPR、SEM、TEM、XPS、FTIR、Raman和UV-Vis等表征。结果表明,等离子体处理可以降低Co_(3)O_(4)中Co元素的平均价态,在其表面形成更多的缺陷点位,降低Co_(3)O_(4)的Co-O键能,增强其低温还原性能;在全太阳光谱的光强为776 mW/cm^(2)、反应空速为30000 mL/(g·h)、甲苯质量分数为500μg/g的测试条件下,Co_(3)O_(4)-P的甲苯降解率为100.0%,其值约为通过焙烧法制备的Co_(3)O_(4)催化剂(Co_(3)O_(4)-T)的2倍。
Plasma modification is an effective way to improve the catalytic activities of materials.Firstly,Co_(2)(OH)_(2)CO_(3)precursor was synthesized by a hydrothermal method.Then,the precursor was subjected to the oxygen atmosphere low-temperature plasma,and the surface modified Co_(3)O_(4) catalyst(Co_(3)O_(4)-P)was obtained,which was further characterized the XRD,SEM,H2-TPR,O_(2)-TPD,TEM,XPS,FTIR,Raman spectrum and UV-visible spectrum.The results demonstrate that plasma treatment could reduce the average valence state of Co elements in Co_(3)O_(4) to form more defective sites on the catalyst surface,and lower the Co-O bond energy of Co_(3)O_(4) to improve its low temperature reduction performance.Under the irradiation of full solar spectrum light with intensity of 776 mW/cm^(2),reaction space velocity of 30000 mL/(g·h)and toluene concentration of 500μg/g,the toluene degradation performance of the Co_(3)O_(4)-P catalyst could reach 100.0%,which was approximately twice that of the Co_(3)O_(4) catalyst(Co_(3)O_(4)-T)prepared by thermal calcination.
作者
齐敏
高栋梁
赵帅
乔旭
崔咪芬
费兆阳
Qi Min;Gao Dongliang;Zhao Shuai;Qiao Xu;Cui Mifen;Fei Zhaoyang(Nanjing Institute of Resources and Environment Engineering Technology Co.LTD,Nanjing Jiangsu 210047,China;College of Chemical Engineering,State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing Jiangsu 210009,China)
出处
《石油化工高等学校学报》
CAS
2023年第2期42-50,共9页
Journal of Petrochemical Universities
基金
国家自然科学青年基金项目(21606130)
国家重点研发计划项目(2019YFC1905804)
江苏省重点研发计划项目(BE2019735)。
