2024-03-28T21:09:02Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/116022018-11-15T11:53:03Zcom_10261_84com_10261_5col_10261_337
Effect of PPTA pre-impregnation with phosphoric acid on the porous texture of carbons prepared by CO2 activation of PPTA chars
Castro Muñiz, Alberto
Martínez Alonso, Amelia
Díez Tascón, Juan Manuel
Activated carbon fibers
PPTA
Phosphoric acid
Microporosity
Mesoporosity
Adsorption
6 pages, 6 figures, 2 tables. -- Available online 5 November 2008.
Activated carbon fibers (ACFs) were prepared by CO2 gasification to different burn-offs of chars from the polyaramid fiber, poly(p-phenylene terephthalamide) (PPTA) pre-impregnated with 5 wt.% H3PO4. Thermogravimetric analysis showed that the addition of phosphoric acid produces a significant increase in the yield of solid residue. While the char yield of the pure polymer at 1000 °C amounted to 39.5 wt.%, it rose to 52.8 wt.% in the case of 5 wt.% H3PO4-impregnated PPTA. The chars and derived ACFs were characterized by physical adsorption of N2 (−196 °C) and CO2 (0 °C). No significant differences were found as concerns chars porosity. At equivalent burn-offs, the surface area of the ACFs prepared by physical activation with CO2 was up to 70% higher in the case of PPTA pre-impregnated with phosphoric acid, the pore size distribution being displaced towards somewhat wider pores within the 2–10 nm range. These results are in contrast with those obtained previously with the poly(m-phenylene isophthalamide) (PMIA) polymer, where H3PO4 pre-impregnation did not significantly affect the porosity of chars and ACFs.
2009-03-16T09:27:07Z
2009-03-16T09:27:07Z
2009-03-01
artículo
Microporous and Mesoporous Materials 119(1/3): 284-289 (2009)
1387-1811
http://hdl.handle.net/10261/11602
10.1016/j.micromeso.2008.10.025
eng
http://dx.doi.org/10.1016/j.micromeso.2008.10.025
closedAccess
Elsevier