介孔材料
吸附
沸石
解吸
化学工程
材料科学
吸附剂
比表面积
多孔性
化学
工程类
复合材料
有机化学
催化作用
作者
Debashis Panda,E. Anil Kumar,Sanjay Kumar Singh
标识
DOI:10.1016/j.jcou.2020.101223
摘要
In this study, we introduced mesoporosity by post-synthesis modification of binder-containing zeolite 4A (Z4A) bodies using urea treatment, to synthesize hierarchical zeolite 4A (HZ4A) with tailored textural properties. Hierarchical zeolite 4A such as HZ4A-1−3, HZ4A-1−1, and HZ4A-3−1 were synthesized by varying the urea to zeolite weight ratio as 1:3, 1:1, and 3:1 respectively. The synthesized HZ4A displayed tunable physicochemical characteristics, where HZ4A-1−3 exhibited improved surface area (126 m2 g−1), enhanced mesopore volume (0.44 cm3 g−1) and co-existence of both micro (ca. 0.4 nm) and mesopores (5.5 nm). HZ4A-1−3 also exhibited enhanced CO2 adsorption performance even when exposed to moisture at 1 bar and 40 °C. Moreover, HZ4A-1−3 displayed excellent CO2 adsorption stability over ten consecutive adsorption-desorption cycles. The presence of mesopores in HZ4A-1−3 facilitated rapid gas diffusion within the pores during both adsorption (29 s faster) and desorption (92 s faster), low water adsorption capacity (20 % lesser), mild desorption temperature (13 °C lesser) and low CO2 heat of adsorption (14 % lesser) as compared to Z4A bodies, and hence achieved better CO2 adsorption efficacy for HZ4A-1−3 with reasonable CO2 regeneration energy. These results suggested the potential of hierarchical zeolite 4A (HZ4A) as a cost-effective sorbent for post-combustion CO2 capture application.
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