Phenomenological analyses of carbon dioxide adsorption kinetics on supported zinc-functionalized ionic liquid hybrid sorbents
Phenomenological analyses of carbon dioxide adsorption kinetics on supported zinc-functionalized ionic liquid hybrid sorbents
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DOI：
10.1016/j.cej.2015.11.054
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发表时间：
2016-03
影响因子：
15.1
通讯作者：
I. Arellano;P. Pendleton
中科院分区：
文献类型：
--
作者：
I. Arellano;P. Pendleton
吸附动力学是评价CO2吸附材料性能时经常被忽略的一个重要参数。在这方面的贡献，我们建立了一个操作描述的CO2吸附动力学，我们最近报道的家庭的新型混合吸附剂（HS）的基础上支持锌功能化离子液体（IL），在广泛的IL负载和形态多样的多孔支持。表观和扩散动力学模型的现象学分析阐明了吸附剂-吸附剂相互作用的性质和限速机制步骤的确定，分别。从Lagergren的伪一阶模型，何和麦凯的伪二阶模型与IL负载和纹理性质的吸附剂的计算速率常数的相关性强烈表明，IL仍然是吸附剂的活性成分，和整体吸附发生通过物理和化学相互作用的组合。从选定的扩散动力学模型的限速机制的见解显示膜扩散阻力控制的整体吸附，与颗粒内扩散促进更大的可访问性IL内的这些HS系统的孔隙网络。
Adsorption kinetics is an important parameter often overlooked in the evaluation of CO2sorbent materials performance. In this contribution, we established an operational description of the CO2adsorption kinetics by our recently reported family of novel hybrid sorbents (HS) based on supported zinc-functionalized ionic liquid (IL), across a wide range of IL loading and a morphologically diverse set of porous supports. Phenomenological analyses of apparent and diffusion kinetics models elucidated the nature of adsorbate–adsorbent interactions and the determination of the rate-limiting mechanistic step, respectively. Correlation of the calculated rate constants from Lagergren’s pseudo-first order model, and Ho and McKay’s pseudo-second order model with IL loading and textural properties of the sorbents strongly suggests that the IL remained the active component of the sorbent, and overall adsorption occurs via a combination of physical and chemical interactions. Insights into the rate-limiting mechanism derived from selected diffusion kinetics models revealed film diffusion resistance controlled overall adsorption, with intraparticle diffusion promoted by greater accessibility to the IL within the pore networks of these HS systems.