CF4, which is widely used in the production of semiconductors and aluminum, has a very high global warming potential and extremely long atmospheric lifetime. Adsorption is an alternative technique to the energy-consuming conventional CF4combustion disposal method, and the development of appropriate adsorbents is important for a competent CF4adsorption process. Here, microporous carbons are synthesized for new CF4adsorbents by the selective etching of titanium carbide using chlorine gas at high temperatures (800, 900, and 1000 °C). Additionally, post-treatment with H2eliminates any unreacted chlorine. Interestingly, the CF4adsorption capacity has a linear relation with the micropore volume for pores less than 0.9 nm. The titanium carbide-based microporous carbon chlorinated at 800 °C and post-treated with H2has the highest CF4adsorption capacity of 2.96 mol kg−1at 25 °C and 1 atm, which is the highest reported value to date. Besides the high CF4adsorption capacity, the prepared microporous carbon shows a high selectivity for CF4over N2at low CF4partial pressures and an excellent cyclic stability.
Bibliographical notePublisher Copyright:
© 2016 Elsevier B.V.
- Microporous carbon
- Titanium carbide
ASJC Scopus subject areas
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering