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

无机盐工业 ›› 2022, Vol. 54 ›› Issue (6): 134-141.doi: 10.19964/j.issn.1006-4990.2021-0696

• 催化材料 • 上一篇    下一篇

前驱体转化法可控制备γ-二氧化锰及其催化燃烧甲苯性能

唐诗昌(),程高,刘琪,叶凡,孙明,余林()   

  1. 广东工业大学轻工化工学院,广东省教育厅清洁化学技术重点实验室,广东 广州 510006
  • 收稿日期:2021-11-17 出版日期:2022-06-10 发布日期:2022-06-22
  • 作者简介:唐诗昌(1996— ),男,在读硕士,研究方向为环境催化与纳米材料;E-mail:1356957011@qq.com
  • 基金资助:
    国家自然科学基金项目(21576054);广东省科技创新战略专项项目(2018A030310563);广东省自然科学基金项目(2019B1515120087);广东省普通高校基础研究与应用基础研究重点项目(2018KZDXM031)

Controllable preparation of γ-MnO2 by precursor conversion method and its catalytic combustion performance of toluene

TANG Shichang(),CHENG Gao,LIU Qi,YE Fan,SUN Ming,YU Lin()   

  1. Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China
  • Received:2021-11-17 Published:2022-06-10 Online:2022-06-22

摘要:

采用前驱体转化法将四氧化三锰分别与硝酸、硫酸、醋酸进行歧化反应,制备了3组γ-二氧化锰催化剂(Mn-N、Mn-S、Mn-A),研究了不同酸对产物结构和形貌的影响。通过X射线衍射(XRD)、扫描电镜(FE-SEM)、透射电镜(HR-TEM)、氮气吸附-脱附、X射线光电子能谱(XPS)、氢气程序升温还原(H2-TPR)和氧气程序升温脱附(O2-TPD)等表征方法系统分析了各产物的物化性质,并采用甲苯催化燃烧作为探针反应用于评估γ-二氧化锰催化剂的活性。结果表明,经硝酸处理得到的催化剂Mn-N具有最佳的甲苯催化燃烧活性,在质量空速为40 000 mL/(g·h)条件下,起燃温度T10(对应转化率为10%)为190 ℃,完全燃烧温度T90(对应转化率为90%)为229 ℃。这可能与其具有较大比表面积、较高的锰(Ⅲ)和吸附氧物种含量、较好的可还原性和晶格氧流动能力有关。此外,经过连续30 h的稳定性实验,Mn-N仍可保持良好的催化活性。

关键词: 前驱体转化, 四氧化三锰, γ-二氧化锰, 甲苯, 催化燃烧

Abstract:

Three groups of γ-MnO2 catalysts(Mn-N,Mn-S,Mn-A) were prepared by disproportionation reaction between Mn3O4 and nitric acid,sulfuric acid,and acetic acid,respectively.The effect of different acid on the structure and morphology of the products was studied.The physical and chemical properties of the products were systematically analyzed by X-ray diffraction(XRD),scanning electron microscopy(FE-SEM),transmission electron microscopy(HR-TEM),nitrogen adsorption desorption,X-ray photoelectron spectroscopy(XPS),hydrogen temperature programmed reduction(H2-TPR) and oxygen temperature programmed desorption(O2-TPD).And toluene catalytic combustion was used as a probe reaction to evaluate the activity of γ-MnO2 catalyst.The results showed that the catalyst Mn-N treated with nitric acid had the best catalytic combustion activity for toluene.Under the condition of mass space velocity of 40 000 mL/(g·h),the ignition temperature T10(corresponding conversion of 10%) was 190 ℃,and the complete combustion temperature T90(corresponding conversion of 90%) was 229 ℃.This may be related to its large specific surface area,high content of Mn(Ⅲ) and adsorbed oxygen species,good reducibility and lattice oxygen flow ability.In addition,Mn-N could still maintain good catalytic activity after continuous stability experiments for 30 h.

Key words: precursor conversion, Mn3O4, γ-MnO2, toluene, catalytic combustion

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