Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse Reaction
Ru-Sn/TiO<sub>2</sub> is an effective catalyst for hydrogenation of aqueous acetic acid to ethanol. In this paper, a similar hydrogenation process was investigated in a flow-type rather than a batch-type reactor. The optimum temperature was 170 °C for the batch-type reactor because of ga...
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doaj-241012919a164d26a9273b8f974bc49e2020-11-25T03:10:19ZengMDPI AGCatalysts2073-43442020-11-01101270127010.3390/catal10111270Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse ReactionYuanyuan Zhao0Kansei Konishi1Eiji Minami2Shiro Saka3Haruo Kawamoto4Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, JapanGraduate School of Energy Science, Kyoto University, Kyoto 606-8501, JapanGraduate School of Energy Science, Kyoto University, Kyoto 606-8501, JapanGraduate School of Energy Science, Kyoto University, Kyoto 606-8501, JapanGraduate School of Energy Science, Kyoto University, Kyoto 606-8501, JapanRu-Sn/TiO<sub>2</sub> is an effective catalyst for hydrogenation of aqueous acetic acid to ethanol. In this paper, a similar hydrogenation process was investigated in a flow-type rather than a batch-type reactor. The optimum temperature was 170 °C for the batch-type reactor because of gas production at higher temperatures; however, for the flow-type reactor, the ethanol yield increased with reaction temperature up to 280 °C and then decreased sharply above 300 °C, owing to an increase in the acetic acid recovery rate. The selectivity for ethanol formation was improved over the batch process, and an ethanol yield of 98 mol % was achieved for a 6.7 min reaction (cf. 12 h for batch) (liquid hourly space velocity: 1.23 h<sup>−1</sup>). Oxidation of ethanol to acetic acid (i.e., the reverse reaction) adversely affected the hydrogenation. On the basis of these results, hydrogenation mechanisms that include competing side reactions are discussed in relation to the reactor type. These results will help the development of more efficient catalytic procedures. This method was also effectively applied to hydrogenation of lactic acid to propane-1,2-diol.https://www.mdpi.com/2073-4344/10/11/1270hydrogenationacetic acidflow-type reactorreverse reactionlactic acid |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yuanyuan Zhao Kansei Konishi Eiji Minami Shiro Saka Haruo Kawamoto |
spellingShingle |
Yuanyuan Zhao Kansei Konishi Eiji Minami Shiro Saka Haruo Kawamoto Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse Reaction Catalysts hydrogenation acetic acid flow-type reactor reverse reaction lactic acid |
author_facet |
Yuanyuan Zhao Kansei Konishi Eiji Minami Shiro Saka Haruo Kawamoto |
author_sort |
Yuanyuan Zhao |
title |
Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse Reaction |
title_short |
Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse Reaction |
title_full |
Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse Reaction |
title_fullStr |
Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse Reaction |
title_full_unstemmed |
Hydrogenation of Aqueous Acetic Acid over RU-Sn/tio2 Catalyst in a Flow-Type Reactor, Governed by Reverse Reaction |
title_sort |
hydrogenation of aqueous acetic acid over ru-sn/tio2 catalyst in a flow-type reactor, governed by reverse reaction |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2020-11-01 |
description |
Ru-Sn/TiO<sub>2</sub> is an effective catalyst for hydrogenation of aqueous acetic acid to ethanol. In this paper, a similar hydrogenation process was investigated in a flow-type rather than a batch-type reactor. The optimum temperature was 170 °C for the batch-type reactor because of gas production at higher temperatures; however, for the flow-type reactor, the ethanol yield increased with reaction temperature up to 280 °C and then decreased sharply above 300 °C, owing to an increase in the acetic acid recovery rate. The selectivity for ethanol formation was improved over the batch process, and an ethanol yield of 98 mol % was achieved for a 6.7 min reaction (cf. 12 h for batch) (liquid hourly space velocity: 1.23 h<sup>−1</sup>). Oxidation of ethanol to acetic acid (i.e., the reverse reaction) adversely affected the hydrogenation. On the basis of these results, hydrogenation mechanisms that include competing side reactions are discussed in relation to the reactor type. These results will help the development of more efficient catalytic procedures. This method was also effectively applied to hydrogenation of lactic acid to propane-1,2-diol. |
topic |
hydrogenation acetic acid flow-type reactor reverse reaction lactic acid |
url |
https://www.mdpi.com/2073-4344/10/11/1270 |
work_keys_str_mv |
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1724659246833860608 |