Carbon Dioxide Capture Properties of MgCl2 Templated Microporous Carbon from p-toluenesulfonic Acid

Authors : Ali Can ZAMAN

Pages : 372-386

Doi:10.35378/gujs.843764

View : 16 | Download : 9

Publication Date : 2022-06-01

Article Type : Research Paper

Abstract :Herein, porous carbon materials were prepared using p-toluenesulfonic acid insert ignore into journalissuearticles values(TsOH); as a carbon source with insert ignore into journalissuearticles values(TsOH-STC); and without insert ignore into journalissuearticles values(TsOH-C); presence of MgCl2.6H2O. The products were evaluated in terms of CO2 insert ignore into journalissuearticles values(carbon dioxide); adsorption performance, texture and surface chemical structure. Both samples contain oxidized sulfur on their surface according to X-ray photoelectron spectroscopy insert ignore into journalissuearticles values(XPS);. TsOH-STC has a 3D porous network, but TsOH-C consists of a dense structure. It was understood that TsOH-C is not suitable to be analyzed with N2 adsorption at cryogenic temperatures probably due to restricted access to narrow pores due to lack of external surface. The CO2 uptakes are 0.78 mmol g-1 for TsOH-C and 0.67 mmol g-1 for TsOH-STC at flue gas conditions insert ignore into journalissuearticles values(0.15 bar and 298 K); of coal fired power plants, which is a projection of ultramicropore insert ignore into journalissuearticles values(pores smaller than 0.7 nm); volume in 0.5 nm range. TsOH-C has CO2 uptake capacity of 2.21 mmol g-1 and TsOH-STC reaches 2.47 mmol g-1 at 1 bar at 298 K. Maximum CO2 adsorption enthalpy insert ignore into journalissuearticles values(Qst); value for TsOH-C is 24.9 kJ mol-1 and that of TsOH-STC is 25.7 kJ mol-1. IAST insert ignore into journalissuearticles values(ideal adsorbed solution theory); selectivities insert ignore into journalissuearticles values(CO2:N2 = 15:85); of the samples are 13.5 for TsOH-STC and 19.7 for TsOH-C at 1 bar. It was shown in this study that salt templating with MgCl2 does not influence ultramicroporosity development and provide moderate level CO2 capture performance. However, templating induces formation of supermicropores insert ignore into journalissuearticles values(micropores larger than 0.7 nm);, large mesopores and macropores on TsOH derived carbons.
Keywords : CO2 capture, Microporous carbon, Sulfur doped carbon, Physisorption