Abstract
A tubular reactor filled with a granular catalyst (granular catalyst-filled reactor) and a tubular reactor (catalyst-coated reactor) in which the surface inside the reactor was porosized and catalyst-coated were the targets of analysis. The concentration of CO2, H2 and CH4 at the gas inlet and outlet of these reactors were analyzed, and the temperature distribution in the reactor in the gas flow direction was obtained, respectively. Based on the reported reaction rate equations, theoutlet gas concentration in the small region in the gas flow direction, considering the mass balance, was successively estimated using the measured value. Furthermore, various parameters were calculated so that the final estimated value was closest to the measured value after the reaction. As a result, it was found that, in the case of a granular catalytic reactor with a uniform temperature inside in order to achieve a CO2 conversion rate of 93%, which is equivalent to the reactor with temperature distribution, the set temperature at the reactor inlet must be raised at 340 °C or higher. On the other hand, in the catalyst-coated reactor, where the reactor internal temperature is equalized, if the temperature, GHSV and pressure were within the measured range, all estimated values agree with the additional measurement values within 10%. Moreover, under the same gas conditions as the granular catalytic reactor, it was estimated that a CO2 conversion rate of 93% could be achieved by increasing the pressure to 1.4 MPa or higher at a set temperature of 340 °C.
