球磨时间对甲醇氧化制甲醛铁钼催化剂结构及性能的影响  

Effects of milling time on structure and performance of iron molybdate catalyst for methanol to formaldehyde

作　　者：韩双双 闫真真 孔令涛 孙继光 陈隽 马凤云[1] HAN Shuang-shuang;YAN Zhen-zhen;KONG Ling-tao;SUN Ji-guang;CHEN Jun;MA Feng-yun(Key Laboratory of Coal Clean Conversion ＆ Chemical Engineering Process of Xinjiang Uyghur Autonomous Region,College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 850046,China;Xinjiang Markor Chemical Co.,Ltd.,Korla 841000,China)

机构地区：[1]煤炭洁净转化与化工过程新疆维吾尔自治区重点实验室,新疆大学化学化工学院,新疆乌鲁木齐830046 [2]新疆美克化工股份有限公司,新疆库尔勒841000

出　　处：《现代化工》2018年第10期114-117,共4页Modern Chemical Industry

基　　金：新疆大学大学生创新训练计划项目(201710755014);新疆大学自然科学基金项目(BS160220); 2017年新疆维吾尔自治区重点研发专项子课题(2017B02012-2)

摘　　要：在无溶剂条件下,以可溶性铁盐和钼酸盐为原料,采用机械球磨法在不同球磨时间下制备铁钼催化剂,采用XRD、SEM、EDS技术对催化剂的晶体结构、形貌和组成进行表征,并利用微型固定床石英管反应器考察铁钼催化剂氧化甲醇制甲醛的性能。结果表明,当球磨时间在30~90 min时,XRD结果表明含有Fe_2(MoO_4)_3和MoO_3衍射峰,无明显杂晶峰,样品形貌主要由颗粒和少许片状结构组成;在反应温度为285℃、质量空速为1.27 h-1条件下,甲醇转化率均接近100%,甲醛选择性差别较小,约为95%。Iron molybdenum catalyst is successfully synthesized via mechanochemistry method with soluble iron salt and molybdates as raw materials under solvent-free conditions at different time of ball milling.The structure,morphology and composition of prepared catalyst are investigated by using X-ray diffraction（XRD）,scanning electron microscope（SEM） and energy dispersive X-ray detector（EDS）.The catalytic performance of prepared catalyst is evaluated through the oxidation of methanol to make formaldehyde in a fixed bed quartz tube micro-reactor.The results via XRD show that the prepared catalyst samples are assigned to Fe2（MoO4）3 and MoO3,without obvious mixed phase peaks and present a large amount of fine grains and very few flake-like when the time of ball milling is in the range of 30-90 min.The conversion rate of methanol approaches to 100% and the selectivity of formaldehyde is about 95% when the prepared catalyst is served,the weight hourly space velocity is 1.27 h-1,and the reaction temperature is at 285℃.

关 键 词：机械化学法 球磨时间 铁钼催化剂 甲醇氧化 甲醛 

分 类 号：O643.32[理学—物理化学]