ZrMn Oxides for Aqueous‐Phase Ketonization of Acetic Acid: Effect of Crystal and Porosity,Chemistry - An Asian Journal

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ZrMn Oxides for Aqueous‐Phase Ketonization of Acetic Acid: Effect of Crystal and Porosity
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-03-30 , DOI: 10.1002/asia.201800114
Kejing Wu _{1,

2} , Mingde Yang ₁ , Husheng Hu ₁ , Junmei Liang ₁ , Yulong Wu _{1,

3}

Affiliation

Aqueous‐phase ketonization of bio‐based acetic acid is important to improve the conversion efficiency of biomass resources. In this study, ZrMn mixed oxides (ZrMnO_x) with high aqueous‐phase ketonization activity are synthetized through a carbonization/oxidation method (COM) and solvothermal method (STM). The results show that ZrMnO_x prepared by COM possesses tetragonal ZrO₂, and hausmannite Mn₃O₄ is observed only at a high oxidation temperature of 750 °C. Low‐temperature and long oxidation results in decreased crystallinity and crystallite size, which is related to highly dispersed Mnⁿ⁺ species. The catalysts with improved acid sites possess high ketonization activity. Surface areas and pore size of ZrMnO_x synthetized by STM are controlled by the solvents for thermal treatment. Compared with water as solvent, ethanol increases the surface area and pore size, resulting in high ketonization activity.

中文翻译：

ZrMn氧化物用于乙酸的水相酮化：晶体和孔隙率的影响

生物基乙酸的水相酮化对于提高生物质资源的转化效率非常重要。在这项研究中，具有高水相酮化活性的ZrMn混合氧化物（ZrMnO _x）是通过碳化/氧化法（COM）和溶剂热法（STM）合成的。结果表明，由COM制备的ZrMnO _x具有四方ZrO ₂，仅在750℃的高氧化温度下才能观察到菱锰矿Mn ₃ O ₄。低温和长时间氧化会导致结晶度和晶粒尺寸降低，这与Mn ⁿ^+的高度分散有关物种。具有改进的酸位点的催化剂具有高的酮化活性。STM合成的ZrMnO _x的表面积和孔径受热处理溶剂的控制。与作为溶剂的水相比，乙醇增加了表面积和孔径，导致了较高的酮化活性。

更新日期：2018-03-30

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