Article history: Spherical carbonaceous adsorbents (CS ) with micro-porosity developed for CO capture were prepared n 2 Received 5 July 2015 by a simple hydrothermal carbonization of carboxymethylcellulose (CMC) in the presence of urea, and Received in revised form 29 January 2016 activated in a high temperature N atmosphere. The effects of speciﬁc surface area, pore structure, and N Accepted 2 February 2016 content on the CO adsorption capacity were systematically investigated. Urea was found to react with Available online 4 February 2016 surface carbonyl groups and other intermediate products generated by CMC hydrothermal carboniza- tion, which produced highly spherical morphologies that also exhibited some ordered lattice structures. Keywords: The particle size of N-doped CS was larger than that of particles prepared without urea. Nitrogen was Spherical carbonaceous adsorbents mainly present in pyridine (N-6), pyrrolic/pyridone (N-5) and quaternary (N-Q) forms. The high CO cap- CO capture ture capacity was produced by a combination of N-doping and developing micro-pore structures. At an N-doping adsorption pressure of 1 bar, the capacity was dominated by the micro-porosity. However, during initial, Hydrothermal carbonization lower pressures the N content dominated the CO adsorption capacity. © 2016 Elsevier B.V. All rights reserved. 1. Introduction Carbon
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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