Abstract
Two series of carbon dioxide adsorbents were prepared from almond shells, by carbonisation followed either by activation with CO 2 or by heat treatment in the presence of ammonia gas (amination). Both procedures gave carbons with high CO 2 adsorption capacities in pure CO 2 as well as in a binary mixture of 15% CO 2 in N 2. Activation with carbon dioxide significantly developed porosity in the samples, mostly in the micropore domain, while amination at 800 °C moderately developed narrow microporosity in the char and incorporated stable nitrogen functionalities, which enhanced CO 2 selectivity. Amination showed two additional advantages over conventional activation with CO 2: a greater carbon yield and a shorter soaking time.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
