Pore Structure Modified CaO-Based Sorbents with Different Sized Templates for CO2 Capture,Energy & Fuels

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Pore Structure Modified CaO-Based Sorbents with Different Sized Templates for CO2 Capture
Energy & Fuels ( IF 5.2 ) Pub Date : 2019-05-17 00:00:00 , DOI: 10.1021/acs.energyfuels.9b00747
Siyu Wei ₁ , Rui Han ₁ , Yanlin Su ₁ , Jihui Gao ₁ , Guangbo Zhao ₁ , Yukun Qin ₁

Affiliation

Porous structure is critical for CO₂ capture performance of CaO-based sorbents in Ca-looping. The sacrificial template method is an easy and effective way to alter the texture structure of sorbent pellets. To explore the optimal pore size distribution for CO₂ sorption, two micron templates, starch and cotton fiber, and two nano templates, carbon nanotubes and carbon nanofibers, were used to modify the pore structure on different scales for the first time. The CO₂ capture capacity of Ca-CNT in the 15th carbonation under severe calcination conditions was 86% more than that of the sorbent without templates. The enhanced CO₂ capture performance was attributed to the uniform small mesopores (2–10 nm) produced by nanosized templates. In this case, a large specific surface area is provided for carbonation. Micron templates would produce additional pores ranging from 10 to 100 nm and even large pores (>400 nm). The analysis results suggest that the pore volume (ranging from 2 to 10 nm) would have the linear relationship with CO₂ uptake at the reaction control stage; the pore volume of 10–100 nm was positively correlated with the CO₂ uptake at the diffusion control stage, and pores larger than 100 nm were ineffective in promoting CO₂ capture.

中文翻译：

具有不同尺寸模板的孔结构修饰的CaO基吸附剂用于CO ₂捕集

多孔结构对于Ca回路中基于CaO的吸附剂的CO ₂捕集性能至关重要。牺牲模板法是一种改变吸附剂颗粒结构的简便有效的方法。为了探索用于CO ₂吸附的最佳孔径分布，首次使用了两个微米模板，即淀粉和棉纤维，以及两个纳米模板，即碳纳米管和碳纳米纤维，以不同的比例修饰了孔结构。在严重煅烧条件下，第15次碳酸化中Ca-CNT的CO ₂捕集能力比没有模板的吸附剂高86％。增强的CO ₂捕获性能归因于纳米尺寸模板产生的均匀小中孔（2-10 nm）。在这种情况下，提供大的比表面积用于碳酸化。微米模板将产生范围从10到100 nm甚至更大的孔（> 400 nm）的其他孔。分析结果表明，在反应控制阶段，孔体积（2〜10 nm）与CO ₂吸收量呈线性关系；在扩散控制阶段，10-100 nm的孔体积与CO ₂吸收呈正相关，大于100 nm的孔对促进CO ₂捕获无效。

更新日期：2019-05-17

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