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Acid Washing of MnOx‐SBA‐15 Composites as an Efficient Way to Improve Catalytic Properties in HCHO Total Oxidation
ChemNanoMat ( IF 3.8 ) Pub Date : 2020-05-25 , DOI: 10.1002/cnma.202000190
Guillaume Rochard 1 , Sébastien Royer 1 , Jean‐Marc Giraudon 1 , Jean‐François Lamonier 1
Affiliation  

The effect of 10 M HNO3 treatment on MnOx nanoparticles mostly confined inside the porous channels of SBA‐15 with low Mn average oxidation state (Mn AOS<3) has been investigated with regard to the physico‐chemical properties of the catalysts as a function of Mn loading (10, 20, 30 wt%) to be tested in the total oxidation of formaldehyde. The acid‐treated catalysts were extensively characterized (ICP, N2‐sorptions, H2‐TPR, TGA/DSC, HRTEM and XPS). It is found that the acid treatment promotes the redox and textural properties of the catalyts. Such property improvements allow to get more efficient catalysts in total oxidation of HCHO. Indeed, the standardized rate rs expressed as mmoles of formaldehyde converted into CO2 per mole of Mn per hour at 130 °C increases by 5 and by 4 for the 20 wt% Mn and 30 wt% Mn‐based catalysts, respectively.

中文翻译:

酸洗MnOx-SBA-15复合材料是提高HCHO总氧化催化性能的有效方法

研究了10 M HNO 3处理对大多数被限制在SBA-15的多孔通道内的MnOx纳米颗粒的影响,这些颗粒具有低Mn平均氧化态(Mn AOS <3),涉及到催化剂的理化性质甲醛总氧化中锰负载量(10、20、30 wt%)的百分比。对酸处理过的催化剂进行了广泛的表征(ICP,N 2吸附,H 2 -TPR ,TGA / DSC,HRTEM和XPS)。发现酸处理促进了催化剂的氧化还原和质构性质。这种性能的改善使得在HCHO的总氧化中可以获得更有效的催化剂。实际上,标准化率rs表示为甲醛的毫摩尔换算成CO 2 对于20 wt%的Mn和30 wt%的Mn基催化剂,在130°C下每小时每摩尔Mn分别增加5和4。
更新日期:2020-05-25
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