Activated Petroleum Coke for Natural Gas Storage
نویسندگان
چکیده
Carvões ativados (CA) são caracterizados por elevadas áreas superficiais específicas e elevados volumes de poros. Os principais processos de obtenção destes materiais consistem na ativação de precursores com elevado teor de carbono, como por exemplo, o coque de petróleo (CP). Neste trabalho CP foi ativado quimicamente com hidróxido de potássio (KOH). O produto foi caracterizado por meio de adsorção de N 2 a 77 K, apresentando elevada capacidade de adsorção, com valores de volume de poros acima de 1,5 cm g e área superficial específica de até 2500 m g, com distribuições de tamanho de poros concentrada na região de supermicroporos (diâmetros entre 0,7 nm e 2 nm). A temperatura de ativação e a razão de impregnação entre CP e KOH foram as variáveis mais significativas do processo. Análise por adsorção de CH 4 em pressões elevadas indicou uma capacidade de armazenamento da ordem de 91 v/v (volume de metano armazenado por volume do leito).
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