Abstract
Abstract We present a process for the synthesis of binder-free carbon monoliths, which were prepared from carbon microspheres at room temperature. The microspheres were obtained through hydrothermal treatment of sucrose, and monoliths with a bulk density around 1 g cm−3 were prepared from them by a simple pressurization process. Subsequently, the monoliths were activated with CO2 in order to increase their porosity. The activation preserved the monolithic shape and yielded maximum BET surface areas close to 4000 m2 g-1. High pressure gas adsorption isotherms reveal that the activated carbon monoliths are interesting candidates for gas storage applications. High excess adsorption amounts are measured for hydrogen (1.2 wt. %) and methane (453 mg g−1) at room temperature and pressures up to 20 MPa. Taking into account the measured densities of the monoliths, a maximum volumetric excess adsorption amount of CH4 of 230 cm3cm−3 is reached.
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