New carbon materials with high porosity in the 1–7 nm range obtained by chemical activation with phosphoric acid of resorcinol–formaldehyde aerogels

• Autor(es): Conceição, FL ; Carrott, PJM ; Ribeiro Carrott, MML
• Data: 2012
• Identificador Persistente: http://hdl.handle.net/10174/5866
• Origem: Repositório Científico da Universidade de Évora
• Assunto(s): Chemistry
• Tipo de Documento: Artigo científico
• Idioma: Português

Descrição

Chemical activation of resorcinol–formaldehyde aerogels with phosphoric acid results in materials containing both intra-particle microporosity (pore volume ˇ0.18 cm3g 1 and mean-pore-width ˇ1 nm) and inter-particle micro/mesoporosity. The latter forms as a result of partial collapse of the mesopore structure of the organic aerogel and can be controlled by varying the phosphoric acid/organic aerogel ratio. Increasing this ratio leads to higher pore volume and size and it was possible to obtain micro/mesopore volumes as high as 1.23 cm3g 1 with pore widths up to ˇ7 nm. Over 90% of these pores were accessible even after blocking all of the ultramicroporosity by pre-adsorption of n-nonane.