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Efficient synthesis of p-chlorobenzaldehyde through liquid-phase oxidation of p-chlorotoluene using manganese-containing ZSM-5 as catalyst

机译:通过使用含锰ZSM-5作为催化剂,通过液相氧化通过液相氧化通过液相氧化合成p-氯苯甲酯

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摘要

Manganese-containing MFI-type Mn-ZSM-5 zeolites were prepared and characterized by XRD, UV-vis DRS, SEM, XPS, N-2 adsorption-desorption, NH3-TPD and ICP-AES techniques. The zeolites show high catalytic activity and selectivity in the heterogeneous oxidation of p-chlorotoluene to p-chlorobenzaldehyde. The effects of catalyst concentration, water addition, HBr amount, as well as reaction time and temperature on product yield were investigated. Under the optimized conditions (catalyst 20 mg, p-chlorotoluene 1 mL, solvent (acetic acid) 10 mL, HBr (40 wt%) 30 mg, H2O3 g, oxygen flow rate 50 mL min(-1), time 8 h, temperature 100 degrees C), the Mn-ZSM-5 (Si/Mn = 48, Mn 1.7 wt%) catalyst shows p-chlorotoluene conversion of 93.8% and p-chlorobenzaldehyde selectivity of 90.5%. The excellent catalytic activity can be attributed to the distribution of Mn species and the mild acid sites.
机译:制备含锰的MFI型Mn-ZSM-5沸石,其特征在于XRD,UV-Vis DRS,SEM,XPS,N-2吸附 - 解吸,NH3-TPD和ICP-AES技术。 沸石显示出高催化活性和在对氯苯乙烯的非均相氧化中的高催化活性和选择性至对氯苯甲醛。 研究了催化剂浓度,水加入,HBR含量以及反应时间和温度对产物产率的影响。 在优化条件下(催化剂20mg,对氯甲苯1mL,溶剂(乙酸)10mL,HBr(40wt%)30mg,H 2 O 3 G,氧流速50mL min(-1),时间8小时, 温度100℃),Mn-ZSM-5(Si / Mn = 48,Mn 1.7wt%)催化剂显示出高达93.8%和对氯苯甲苯二甲醛的对氯丁橡胶的选择性为90.5%。 优异的催化活性可归因于Mn种类和低酸位点的分布。

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  • 来源
    《RSC Advances》 |2015年第91期|共8页
  • 作者单位

    Hunan Univ Coll Chem &

    Chem Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Chem &

    Chem Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Chem &

    Chem Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Chem &

    Chem Engn Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Chem &

    Chem Engn Changsha 410082 Hunan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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