摘要
以钼酸为原料,调节钼酸溶液p H然后进行水热反应,将沉淀焙烧处理,制得了非担载的六方相三氧化钼催化剂。通过X射线衍射（XRD）、扫描电镜（SEM）、红外光谱（FT-IR）、拉曼（Raman）光谱、X射线光电子能谱（XPS）、氢气程序升温还原（H2-TPR）对三氧化钼催化剂的理化性质进行表征,通过甲醇选择性氧化生成甲醛反应评价催化剂的催化活性。结果表明：在水热温度为60~120℃、焙烧温度为150~350℃条件下,制得了六方相三氧化钼,该结果被XRD、FT-IR、XPS和Raman光谱所证实。制得的六方相三氧化钼呈六棱柱形,直径为1~10μm、长径比为5~10。制得的六方相三氧化钼催化剂对甲醇选择性氧化表现出一定的活性。
Metastable hexagonal molybdenum trioxide was successfully synthesized using molybdic acid as precursor via a facile hydrothermal treatment followed by calcination.The products were characterized X-ray diffraction（XRD）,scanning electron microscopy（SEM）,Fourier transform infrared spectroscopy（FT-IR）,H2 temperature programmed reduction（H2-TPR）,X-ray photoelectron spectroscopy（XPS）,and Raman spectroscopy.The catalyst′s activity was evalued by the selective oxidation reaction of methanol to formaldehyde.Results indicated that the relatively pure hexagonal MoO3 catalysts confirmed by XRD,FT-IR,XPS,and Raman spectroscopy can be obtained at a hydrothermal reaction temperature of 60~120 ℃ and a calcination temperature of 150~350 ℃,respectively,and the resulting h-MoO3 presented a morphology of hexa-prism with a diameter from 1 to 10 micrometer and a slenderness ratio of 5~10.The synthesized h-MoO3 catalysts exhibited rather high low temperature reactivity for methanol oxidation to formaldehyde.
出处
《无机盐工业》
CAS
北大核心
2016年第3期77-82,共6页
Inorganic Chemicals Industry
基金
江苏省自然科学基金项目(SBK2012681)
高等学校博士学科点专项科研基金项目(20123250120008)
江苏高校优势学科建设工程项目资助
关键词
水热合成
六方相三氧化钼
甲醇
选择性氧化
甲醛
hydrothermal synthesis
h-MoO3
methanol
selective oxidation
formaldehyde
