2026-03-11T16:59:03Z https://kitami-it.repo.nii.ac.jp/oai

oai:kitami-it.repo.nii.ac.jp:00006595 2025-01-30T05:28:35Z 7:15:39

Transient Characterization of Carbon Monoxide, Carbon Dioxide and Oxygen Adsorbed on MgO and MgCO_3 Yasuyuki, KONISHI Toshio, KATAGIRI Shichi, YASUI Yoshinori, NAKANISHI Tohru, KANNO Masayoshi, KOBAYASHI application/pdf The dynamic adsorption behavior of O_2, CO and CO_2 on MgO and MgCO_3 has been studied in detail at temperatures ranging from 150 to 171℃, by using the transient response method. 0n MgCO_3 no CO adsorbs and no CO oxidation proceeds. CO_2 is reversibly adsorbed obeying the Langmuir isotherm and the heat of adsorption is evaluated to be 2.7kcal/mol. On MgO, on the other hand, no CO adsorbs whereas the oxidation of CO easily proceeds and the rate equation is expressed : γ=kPco^<0.63>Po_2^<0.29> The apparent activation energy of reaction is estimated to be 14.6 kcal/mol. CO_2, adsorbs on the surface in both the reversible and irreversible forms. The reversibly adsorbed CO_2 has 4.3 kcal/mol of activation energy for adsorption and 13 kcal/mol for desorption. The irreversibly adsorbed CO_2 can partly desorb by elevating the temperature. A large part of the surface is covered with the strongly adsorbed CO_2, the surface coverage of which is 0.86. Only a small part of the active sites (θ=4.2×10^<-4>) is available for the adsorption of oxygen and one fifth of the amount is irreversible. The mode of the transient response curves obtained in the oxidation of CO indicates a typical monotone type suggesting that the reaction rate is controlled by the surface reaction and the desorptipon of CO_2. 北見工業大学 1986-11 eng departmental bulletin paper https://kitami-it.repo.nii.ac.jp/records/6595 北見工業大学研究報告 18 1 45 62 https://kitami-it.repo.nii.ac.jp/record/6595/files/18-1-4.pdf application/pdf 7.2 MB 2016-11-22