Impact of gas-solid direct contact on gas-liquid-solid reaction performance in a flow reactor

IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Journal of Flow Chemistry Pub Date : 2023-11-28 DOI:10.1007/s41981-023-00295-9
Shusaku Asano, Hiroyuki Miyamura, Mizuki Matsushita, Shinji Kudo, Shū Kobayashi, Jun-ichiro Hayashi
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Abstract

Although gas-liquid-solid reactions, such as catalytic hydrogenation, have a long history, a fundamental understanding of the flow behavior and its effect on the reaction is lacking for flow chemistry applications using powder catalysts. This study revealed the distinctive effect of gas-solid direct contact on the surface of a powder catalyst. Direct gas–solid contact accelerates the reaction beyond the theoretical maximum of the batch reaction system, where gaseous species are supplied to the catalyst surface after dissolution into the liquid. The benefit of direct contact is further pronounced in systems with low-solubility gaseous species. Liquid holdup analysis revealed that the micro-concavities of the catalyst support is crucial for sustaining the liquid using capillary forces and supplying the liquid substrate to the catalyst surface even under high gas flow rate conditions. The gas-to-liquid flow rate ratio (G/L) is a decisive factor for direct gas–solid contact, whereas the flow direction, whether upflow or downflow, has no impact on powder catalysts with a size of a few hundred microns.

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流动反应器中气固直接接触对气液固反应性能的影响
摘要:虽然催化加氢等气-液-固反应有着悠久的历史,但在粉末催化剂的流动化学应用中,对其流动行为及其对反应的影响还缺乏基本的认识。本研究揭示了粉末催化剂表面气固直接接触的独特效果。气固直接接触使反应加速,超出了间歇反应系统的理论最大值,在间歇反应系统中,气态物质在溶解到液体中后被供应到催化剂表面。在具有低溶解度气体的体系中,直接接触的好处更加明显。液含率分析表明,即使在高气体流速条件下,催化剂支架的微凹孔对于利用毛细力维持液体和向催化剂表面提供液体基质至关重要。气液流量比(G/L)是气固直接接触的决定性因素,而对于几百微米大小的粉末催化剂,流动方向(向上或向下)没有影响。图形抽象
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来源期刊
Journal of Flow Chemistry
Journal of Flow Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
3.70%
发文量
29
审稿时长
>12 weeks
期刊介绍: The main focus of the journal is flow chemistry in inorganic, organic, analytical and process chemistry in the academic research as well as in applied research and development in the pharmaceutical, agrochemical, fine-chemical, petro- chemical, fragrance industry.
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