CO2 absorption on Na2ZrO3:: A kinetic analysis of the chemisorption and diffusion processes
CO2 absorption on Na2ZrO3:: A kinetic analysis of the chemisorption and diffusion processes
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DOI：
10.1021/jp710475g
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发表时间：
2008-04-24
影响因子：
3.7
通讯作者：
Pfeiffer, Heriberto
中科院分区：
文献类型：
--
作者：
Alcerreca-Corte, Itzel;Fregoso-Israel, Esteban;Pfeiffer, Heriberto
研究了二氧化碳（CO2）在锆酸钠（Na 2 ZrO 3）上的化学吸附动力学。最初，Na 2 ZrO 3进行了分析，通过X射线衍射，扫描电子显微镜，和N-2吸附，表征材料。最后，在CO2通量下对材料进行热分析。随后，在CO2流量下进行了不同的等温实验，以研究CO2在Na 2 ZrO 3上的化学吸附动力学。结果表明，在加热过程中，试样存在烧结效应。这种效果产生，在低温下，在CO2 chernisorption效率的下降。然而，在高温下，一旦钠扩散被激活，烧结效应不干扰CO 2化学吸附过程。模拟CO2在Na 2 ZrO 3上的化学吸附（在一个双重过程：chernisorption和钠扩散），使我们能够估计这些过程的活化能，33 866 J/mol（化学吸附）和48 009 J/mol（扩散），这表明扩散过程是限制步骤。
The kinetics analysis of carbon dioxide (CO2) chemisorption on sodium zirconate (Na2ZrO3), which implies a sodium diffusion process, was investigated. Initially, Na2ZrO3 was analyzed by X-ray diffraction, scanning electron microscopy, and N-2 adsorption, to characterize the material. Finally, the material was thermally analyzed under a CO2 flux. Later, different isothermal experiments were performed under a CO2 flux to study kinetically the CO2 chernisorption on Na2ZrO3. Results showed that there is a sintering effect of the sample during the heating process. This effect produced, at low temperatures, a decrease in the CO2 chernisorption efficiency. However, at high temperatures, once the sodium diffusion was activated, the sintering effect did not interfere with the CO, chernisorption process. Modeling the CO2 chemisorption on Na2ZrO3 (in terms of a double process: chernisorption and sodium diffusion) allowed us to estimate the activation energy for these processes, 33 866 J/mol (chemisorption) and 48 009 J/mol (diffusion), which demonstrated that the diffusion process is the limiting step.