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Aqueous‐phase ketonization of acetic acid over Zr/Mn mixed oxides
Author(s) -
Wu Kejing,
Yang Mingde,
Chen Yu,
Pu Weihua,
Hu Husheng,
Wu Yulong
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15687
Subject(s) - chemistry , catalysis , acetic acid , aqueous solution , inorganic chemistry , selectivity , leaching (pedology) , acetone , aqueous two phase system , tetragonal crystal system , nuclear chemistry , phase (matter) , organic chemistry , environmental science , soil science , soil water
Aqueous‐phase ketonization possesses significant advantages over gas‐ or organic‐phase ketonization for improved conversion efficiency of aqueous fraction accompanied by algal bio‐oil production. In this study, synthetized ZrO 2 and Zr/Mn oxides are used for aqueous‐phase ketonization of acetic acid. ZrMn 0.5 O x shows the highest ketonization activity at 340°C for 12 h, achieving maximum acetone yield of 88.27%; and all catalysts exhibited selectivity higher than 96.75%. Apparent activation energy and acid reaction order are 161.2 kJ mol −1 and 0.70, respectively. Results suggest high ketonization activity of poorly crystallized tetragonal ZrO 2 . Addition of Mn results in ZrO 2 /MnO x solid solution and improves active sites. Acid property and Mn 4+ content are important factors, and oxygen vacancy demonstrates relationship with ketonization activity for ZrO 2 . Examination of recovered catalysts indicates that ZrMn y O x exhibits improved stability, and Mn leaching and crystal phase transformation are main causes of deactivation in aqueous‐phase ketonization. © 2017 American Institute of Chemical Engineers AIChE J , 63: 2958–2967, 2017