Structure Property–CO2 Capture Performance Relations of Amine-Functionalized Porous Silica Composite Adsorbents,ACS Applied Materials & Interfaces

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Structure Property–CO2 Capture Performance Relations of Amine-Functionalized Porous Silica Composite Adsorbents
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-09-13 00:00:00 , DOI: 10.1021/acsami.8b13069
Guojie Zhang _{1,

2} , Peiyu Zhao ₁ , Ying Xu ₁ , Zhixiu Yang ₁ , Haizhu Cheng ₁ , Yongfa Zhang ₁

Affiliation

In order to investigate the influence of support structure properties on CO₂ capture performances of solid amine adsorbents, a novel three-dimensional disordered porous silica (3dd) with hierarchical pore networks was developed and then compared to other three materials as adsorbent support, namely, hierarchical porous silica (HPS), MCM-41, and SBA-15. They were all functionalized with tetraethylenepentaamine (TEPA) to prepare CO₂ adsorbents. The adsorbents’ ability to capture CO₂ was examined on a fixed-bed reactor. When these supports had 60 wt% TEPA loading, the amounts of CO₂ captured followed the order 3dd > HPS > SBA-15 > MCM-41 at 75 °C; the adsorption capacities were 5.09, 4.9, 4.58, and 2.49 mmol/g, respectively. The results indicate that a larger pore volume can promote the dispersion of amine species to expose more active sites for CO₂ capture. The larger pore size can decrease the CO₂ diffusion resistance. High surface area is not an important factor in determining capture performance. In addition, compared with conventional single-size mesopores, the hierarchical pore networks can disperse the TEPA species in different levels of the channel to limit undesired loss/aggregation of impregnated TEPA species. Thus, the 3dd support exhibits the best stability and highest regeneration conversion compared to the other three supports. This work demonstrates that the rational design of adsorbent support systems can effectively relieve the trade-off between amine loading and diffusion resistance. One method to surmount this trade-off is to utilize an adsorbent platform with hierarchical pore networks. Thus, this work may provide a feasible strategy for the design of CO₂ solid amine adsorbents with high capture amount and amine utilization efficiency.

中文翻译：

胺官能化多孔二氧化硅复合吸附剂的结构性质– CO ₂捕集性能关系

为了研究载体结构性质对固体胺吸附剂的CO ₂捕获性能的影响，开发了一种新型的具有分级孔网络的三维无序多孔二氧化硅（3dd），然后将其与其他三种材料作为吸附剂载体进行了比较，即分级多孔二氧化硅（HPS），MCM-41和SBA-15。将它们全部用四亚乙基五胺（TEPA）官能化以制备CO ₂吸附剂。在固定床反应器上检查了吸附剂捕获CO ₂的能力。当这些载体的TEPA含量为60 wt％时，CO ₂的量在75°C下按照3dd> HPS> SBA-15> MCM-41的顺序捕获; 吸附容量分别为5.09、4.9、4.58和2.49 mmol / g。结果表明，较大的孔体积可以促进胺类物质的分散，从而暴露出更多的活性位点来捕获CO ₂。较大的孔径可以降低CO ₂扩散阻力。高表面积不是决定捕获性能的重要因素。另外，与常规的单一尺寸的中孔相比，分层的孔网络可以将TEPA种类分散在通道的不同水平上，以限制浸渍的TEPA种类的不希望的损失/聚集。因此，与其他三种载体相比，3dd载体表现出最佳的稳定性和最高的再生转化率。这项工作表明，吸附剂载体系统的合理设计可以有效地减轻胺负载量和扩散阻力之间的折衷。克服这种折衷的一种方法是利用具有分级孔网络的吸附剂平台。因此，这项工作可以为CO ₂的设计提供可行的策略。具有高捕获量和胺利用效率的固体胺吸附剂。

更新日期：2018-09-13

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