Abstract To investigate the adsorption kinetics and thermodynamic adsorption mechanism and laws of dry flue gas desulfurization, we prepared a new adsorbent by loading Cr, Cu, and Zn on TiO2-loaded multiwalled carbon nanotubes. Desulfurization experiments were also carried out. In this study, three kinds of samples were used for simulation and diffusion processes in the dynamic adsorption of different SO2 volume fractions in flue gas and thermodynamic model analysis of different temperatures in flue gas. Results show that the diffusion coefficient of SO2 in three kinds of samples ranges from 10−16 to 10−14 m2 s−1, and the diffusion may be dominated by configuration diffusion. The intraparticle diffusion model predicts that the performance improves with an increase in the SO2 volume fraction and a shift of adsorption time. This finding indicates that an increase in SO2 volume fraction and a change in adsorption time increase the Kundsen diffusion specific gravity and decrease the configuration diffusion specific gravity, thereby increasing the SO2 diffusion resistance, which becomes faster than the activation energy barrier resistance in the catalytic oxidation reaction. Thus, the diffusion resistance specific gravity increases in the total resistance of the diffusion reaction. One possible mechanism of the adsorption process is the transition to surface reaction control at the early stage of adsorption to joint control of late diffusion and surface reactions. Adsorption thermodynamics studies show that SO2 adsorption by three adsorbents is a spontaneous, exothermic, and entropic reduction process, and the increase in temperature is inconducive for SO2 adsorption in three samples.

中文翻译：

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SO2在负载金属的多壁碳纳米管上的吸附动力学和热力学

摘要 为研究干法烟气脱硫的吸附动力学和热力学吸附机理和规律，我们将Cr、Cu和Zn负载在TiO2负载的多壁碳纳米管上，制备了一种新型吸附剂。还进行了脱硫实验。本研究采用三种样品对烟气中不同SO2体积分数的动态吸附和烟气中不同温度的热力学模型分析进行模拟和扩散过程。结果表明，SO2在三种样品中的扩散系数范围为10-16～10-14 m2 s-1，扩散可能以构型扩散为主。颗粒内扩散模型预测性能随着 SO2 体积分数的增加和吸附时间的变化而提高。这一发现表明，SO2体积分数的增加和吸附时间的变化，使Kundsen扩散比重增加，构型扩散比重降低，从而增加了SO2扩散阻力，比催化氧化中的活化能垒阻力变快。反应。因此，扩散阻力比重在扩散反应的总阻力中增加。吸附过程的一种可能机制是从吸附早期的表面反应控制过渡到后期扩散和表面反应的联合控制。吸附热力学研究表明，三种吸附剂对 SO2 的吸附是一个自发的、放热的、熵的还原过程，