Characteristics of Reaction and Temperature in Catalytic Reactors for CO<sub>2</sub> Methanation

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  • Yokoyama Koichi
    Graduate School of Advanced Science and Engineering, Hiroshima University AQCS Technology Development Department, Mitsubishi Heavy Industries, Ltd.
  • Sasaki Goki
    AQCS Technology Development Department, Mitsubishi Heavy Industries, Ltd.
  • Kiyosawa Masashi
    AQCS Technology Development Department, Mitsubishi Heavy Industries, Ltd.
  • Sato Kazunori
    Graduate School of Advanced Science and Engineering, Hiroshima University
  • Hirano Tomoyuki
    Graduate School of Advanced Science and Engineering, Hiroshima University
  • Ogi Takashi
    Graduate School of Advanced Science and Engineering, Hiroshima University

Bibliographic Information

Other Title
  • CO<sub>2</sub>メタネーション用触媒反応器の反応および温度特性<b></b>
  • CO₂メタネーション用触媒反応器の反応および温度特性
  • CO ₂ メタネーションヨウ ショクバイ ハンノウキ ノ ハンノウ オヨビ オンド トクセイ

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Description

<p>CO2 methanation technology is attracting attention from the viewpoint of carbon circulation. This technology enables H2 and the CO2 extracted from flue gas to be used as raw materials to produce CH4, and utilizes a catalytic reactor based on the Sabatier reaction. However, it is also known that the temperature of the catalyst layer rapidly increases at the initial stage of the reaction, and the sharp temperature increase becomes remarkable as the reactor becomes larger. Based on the issues above, in the present study, the reaction properties were firstly examined focusing on CO2 conversion and the peak temperature of the catalyst layer for five kinds of catalyst using a double tubular reactor. As a result, the increase in the peak temperature is up to 143°C, and it was found that the peak temperature must be suppressed. Next, the authors made a prototype reactor with a catalyst thickness of 3 mm, in which the test gas and a heat medium are a crossflow, and attempted to reduce the peak temperature for the selected catalyst (METH®134) having the lowest peak temperature. The result was the rise of maximum peak temperature was 23°C or less. The temperature was significantly lower compared to that of 48°C for the double tubular reactor. It was predicted that thinning the catalyst layer would be effective in reducing the peak temperature.</p>

Journal

  • KAGAKU KOGAKU RONBUNSHU

    KAGAKU KOGAKU RONBUNSHU 49 (2), 28-37, 2023-03-20

    The Society of Chemical Engineers, Japan

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