Pitch-based spherical activated carbons with small mesopores for CO2 capture

IF 2.5 4区 材料科学 Q2 CHEMISTRY, APPLIED
Dongdong Zhang, Kaixi Li
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引用次数: 0

Abstract

A simple suspension polymerization coupling with oxidative stabilization, carbonization, and H2O steam activation are applied to synthesize a series of hierarchical porous millimeter-sized pitch-based spherical activated carbons (PSAC). The as-obtained PSAC possess a tunable specific surface area from 975 m2 g− 1 to 1761 m2 g− 1, a pore volume of 0.44 ~ 0.82 cm3 g− 1, and spherical morphology via regulation of H2O activation time. The CO2 adsorption capacity is closely related to the ultramicroporous volumes below 0.2 bar. The introduction of rich micropores has a positively influence on CO2 adsorption capacity that can reach 2.59 mmol g− 1 at 1.0 bar. When the pressure increasing to 5.0 bar, the micro-mesoporous PSAC shows higher CO2 adsorption capacity of 7.23 mmol g− 1 at 5 bar than microporous PSAC, indicating that the introduction of moderate mesopores can accelerate CO2 diffusion rate and improve the utilization of micropores active adsorption sites. Based on the ideal adsorption solution theory (IAST), the CO2/N2 and CO2/H2O adsorption selection factors Sads of PSAC are as high as 49.9 and 8.29, respectively. Therefore, PSAC with high adsorption/desorption rate, good selectivity for CO2/N2 and CO2/H2O, excellent renewability, and easy mass production provide potential options for industrial application of CO2 capture.

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来源期刊
Journal of Porous Materials
Journal of Porous Materials 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.70%
发文量
203
审稿时长
2.6 months
期刊介绍: The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.
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