Preparation of carbon dioxide adsorbents from the chemical activation of urea-formaldehyde and melamine-formaldehyde resins

摘要

Adsorption is considered to be one of the more promising technologies for the capture of CO_2from flue gases. In general, nitrogen enrichment is reported to be effective in enhancing the specific adsorbent-adsorbate interaction for CO_2. Nitrogen enriched carbons were produced from urea-formaldehyde and melamine-formaldehyde resins polymerised in the presence of K_2CO_3 as a chemical activation agent, with activation undertaken over a range of temperatures. CO_2 adsorption capacity was determined to be dependent upon both textural properties and more importantly nitrogen functionality. Adsorbents capable of capturing above 8 wt. percent CO_2 at 25 deg C were produced from the chemical activation of urea-formaldehyde resin at 500 deg C. Chemical activation seems to produce more effective adsorbents than CO_2 activation.