ZrMn Oxides for Aqueous-Phase Ketonization of Acetic Acid: Effect of Crystal and Porosity

Kejing Wu; Mingde Yang; Husheng Hu; Junmei Liang; Yulong Wu

doi:10.1002/asia.201800114

ZrMn Oxides for Aqueous-Phase Ketonization of Acetic Acid: Effect of Crystal and Porosity

Chem Asian J. 2018 May 4;13(9):1180-1186. doi: 10.1002/asia.201800114. Epub 2018 Mar 30.

Authors

Kejing Wu^{1

2}, Mingde Yang¹, Husheng Hu¹, Junmei Liang¹, Yulong Wu^{1

3}

Affiliations

¹ Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, P. R. China.
² Institute of New Energy Low-Carbon Technology, Sichuan University, Chengdu, 610065, P. R. China.
³ Beijing Key Laboratory of Fine Ceramics, Beijing, 100084, P. R. China.

PMID: 29498220
DOI: 10.1002/asia.201800114

Abstract

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 Mn₃ O₄ 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.

Keywords: ZrMn oxides; acetic acid; aqueous-phase ketonization; oxidation; solvothermal treatment.