摘要
采用水热合成法制备Ce-MOF载体,通过浸渍氧化锰、氧化钴的前驱体后得到催化剂MnO_(x)-CeO_(2)和Co_(3)O_(4)-CeO_(2)。研究表明,催化剂Co_(3)O_(4)-CeO_(2)在120℃时甲醛转化率为79.11%。MnO_(x)-CeO_(2)的催化性能最优,当温度为100℃时,可以将甲醛完全转化为H_(2)O和CO_(2)。通过X-射线衍射(XRD)、程序升温还原(H_(2)-TPR)和程序升温脱附(O_(2)-TPD)进行表征,说明加入Mn既有利于CeO_(2)表面氧物种的迁移,促进氧物种的脱附,又有利于表面氧在CeO_(2)的还原性,促进还原过程中的氧转移。结果表明,MnO_(x)-CeO_(2)低温时较强的还原能力以及其丰富的表面氧物种有利于提高催化剂的催化性能。
Ce-MOF was prepared by hydrothermal synthesis, MnO_(x)-CeO_(2)and Co_(3)O_(4)-CeO_(2)catalysts were prepared by impregnating manganese oxide and cobalt oxide, drying and calcining. Co_(3)O_(4)-CeO_(2)exhibited good performance, the formaldehyde conversion rate of catalyst Co_(3)O_(4)-CeO_(2)was 79.11% at 120 ℃. MnO_(x)-CeO_(2)exhibited the best performance, that HCHO was completely into H_(2)O and CO_(2)at 100 ℃. The results of XRD,H_(2)-TPR and O_(2)-TPD characterizations revealed that the addition of manganese not only facilitated the migration of oxygen species on CeO_(2)surface, but also promoted the desorption of oxygen species, which was beneficial to the reduction of surface oxygen in CeO_(2)and promote oxygen transfer in the reduction process. And MnO_(x)-CeO_(2)catalyst not only has excellent reduction ability at low temperature, but also has abundant surface-active oxygen species, which improve the catalytic activity of catalyst.
作者
王皓萌
王贵方
苏晨光
郑福东
夏伟
崔静怡
卢素红
WANG Hao-meng;WANG Gui-fang;SU Chen-guang;ZHENG Fu-dong;XIA Wei;CUI Jing-yi;LU Su-hong(School of Chemistry and Chemical Engineering,Xi’an Shiyou University,Xi’an Shaanxi 710065,China)
出处
《当代化工》
CAS
2023年第1期133-136,共4页
Contemporary Chemical Industry
基金
陕西省自然科学基础研究计划项目(项目编号:2021JQ-582)
国家级大学生创新创业训练计划项目(项目编号:S202010705034)
西安石油大学研究生创新与实践能力培养计划项目(项目编号:YCS19211024)。
