无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ
催化材料

(C5H7N2O24(SiMo12O40)的合成、结构及催化氧化碘离子研究

  • 冯潇 ,
  • 郭军 ,
  • 张丹
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  • 1.贵州师范大学化学与材料科学学院,贵州贵阳 550001
    2.瓮福(集团)有限责任公司中低品位磷矿及其共伴生资源高效利用国家重点实验室·博士后工作站
冯潇(1995— ),女,硕士研究生,主要研究方向为无机材料合成及工艺研究;E-mail: 479794798@qq.com

收稿日期: 2020-11-05

  网络出版日期: 2021-09-08

基金资助

国家自然科学基金项目(21862005);贵州省科技厅计划项目(黔科合LH字[2017]7336);贵州省科技厅计划项目(黔合基础[2019]1457);贵州省科技厅计划项目(黔科合支撑[2019]2835);贵州省科技厅计划项目(黔科合平台人才[2018]5769);贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]126);中低品位磷矿及其共伴生资源高效利用国家重点实验室开放课题项目(WFKF2017-03)

Study on synthesis,structure and catalytic iodide oxidation of (C5H7N2O24(SiMo12O40

  • Xiao Feng ,
  • Jun Guo ,
  • Dan Zhang
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  • 1. School of Chemistry and Materials Science,Guizhou Normal University,Guiyang 550001,China
    2. State Key Laboratory and Postdoctoral Workstation for Efficient Utilization of Medium and Low Grade Phosphate Rock and Its Associated Resources,Wengfu(Group) Co.,LTD

Received date: 2020-11-05

  Online published: 2021-09-08

摘要

采用常规水溶液法合成了一种新型的有机-无机杂化多金属氧酸盐(C5H7N2O24(SiMo12O40)(简称SiMo-12)。采用红外光谱(IR)、热重分析(TG)、单晶和粉末X射线衍射(XRD)、元素分析等对SiMo-12进行了表征。以过氧化氢为氧化剂,运用SiMo-12催化碘离子氧化,考察了催化剂用量、氧化剂用量、pH、温度等因素对反应速率的影响。结果表明:该化合物属三斜晶系,P-1空间群,晶胞参数a=1.097 58(4) nm、b=1.144 88(4) nm、c=1.252 66(4) nm、α=64.665(1)°、β=64.804(1)°、γ=83.441(1)°、V=1.282 89(8) nm3Z=1、R=0.034 0、wR2=0.079 9。化合物由4个1-咪唑乙酸和一个经典的Keggin型[SiMo12O40]4-单元组成,有机配体和多金属氧酸阴离子之间通过静电作用、质子转移以及氢键作用沿x轴形成一维链,链与链之间相互平行形成平行于xy面的二维层,层与层之间再通过氢键连接而得到三维网状结构。SiMo-12在催化碘离子氧化中表现出较为优异的催化活性,在c(SiMo-12)=2.0×10-4 mol/L、c(过氧化氢)=2.0×10-3 mol/L、pH=1.4、50 ℃条件下反应速率达到2.641 6×10-5 mol/(L·s),比未加催化剂时的反应速率提高了1 565倍。

本文引用格式

冯潇 , 郭军 , 张丹 . (C5H7N2O24(SiMo12O40)的合成、结构及催化氧化碘离子研究[J]. 无机盐工业, 2021 , 53(9) : 109 -113 . DOI: 10.19964/j.issn.1006-4990.2020-0554

Abstract

A novel organic-inorganic hybrid polyoxometalate(C5H7N2O24(SiMo12O40)(short for SiMo-12) was synthesized by the conventional aqueous solution method.The compounds were characterized by infrared spectroscopy(IR),thermogravimetric analysis(TG),single crystal and powder X-ray diffraction(XRD) and elemental analysis.With hydrogen peroxide as oxidant,SiMo-12 was used to catalyze the oxidation of iodine ions.The effect of catalyst dosage,oxidant dosage,pH,temperature and other factors on the reaction rate were investigated.The results showed that the compound belonged to the triclinic crystal system,P-1 spatial group,cell parameters a=1.097 58(4) nm、b=1.144 88(4) nm、c=1.252 66(4) nm、α=64.665(1)°、β=64.804(1)°、γ=83.441(1)°、V=1.282 89(8) nm3Z=1、R=0.034 0、wR2=0.079 9.The structure of the compounds was composed of four 1-imidazoleacetic acid and a classical Keggin[SiMo12O40]4- unit and the organic ligands and the polyoxo-metalate anion formed a one-dimensional chain along x axis through electrostatic interaction,proton transfer and hydrogen bonding.These chains were parallel to each other,forming a two-dimensional layers parallel to the xy plane,which were connected by hydrogen bonds to obtain a three-dimensional network structure.The catalyst exhibited excellent catalytic activity in the oxidation of iodide ion,and the reaction rate reached 2.641 6×10-5 mol/(L·s) at the condition of c(SiMo-12)=2.0×10-4 mol/L、c(H2O2)= 2.0×10-3 mol/L、pH=1.4、T=50 ℃,which was 1 565 times higher than that without catalyst.

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