CO 2 Adsorption Performance of Activated Coke Prepared from Biomass and Coal

He Gao, Shaohua Wang, Miaomiao Hao, Wei Shao, Shuhui Zhang (), Lei Zhang () and Xiaohan Ren ()
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He Gao: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Shaohua Wang: Shandong Provincial Oil and Gas Pipeline Protection Service Center, Jinan 250012, China
Miaomiao Hao: Center for Ecology and Environmental Protection Education and Communications of Shandong Province, Jinan 250100, China
Wei Shao: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Shuhui Zhang: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Lei Zhang: Department of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Xiaohan Ren: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China

Energies, 2023, vol. 16, issue 9, 1-21

Abstract: CO 2 adsorption is one of the promising CCS technologies, and activated coke is a solid adsorbent with excellent adsorption properties. In this study, activated coke was prepared by using bituminous coal and coconut shells activated with KOH or CaCl 2 in a physically activated atmosphere and modified with ammonia. The effect of the active agent impregnation ratio on the physicochemical properties of activated coke was investigated by N 2 adsorption isotherms, scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). The CO 2 adsorption performance of activated coke was tested, and the effect of nitrogen-containing functional groups on CO 2 adsorption was investigated by experiments and simulations. The results showed that the specific surface area of activated coke reached 629.81 m 2 /g at a KOH impregnation ratio of 0.5 and 610.66 m 2 /g at a CaCl 2 impregnation ratio of 1. The maximum CO 2 adsorption capacity of activated coke reached 71.70 mg/g and 90.99 mg/g for conventional power plant flue gas and oxy–fuel combustion flue gas, respectively. After ammonia modification, the CO 2 adsorption capacity of activated coke was further increased. Simulations showed that pyrrole and pyrrole functional groups changed the polarity of graphene and established weak interactions with CO 2 .

Keywords: active coke; activation; CO 2; adsorption; nitrogen-containing functional groups (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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