Synthesis of activaded carbon materials from petroleum coke / Sintese de materiais carbonosos ativados a partir de coque de petroleo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Activated Carbon MateriaIs (ACM), such as Activated Carbons (AC) and Carbon Molecular Sieves (CMS), are characterized by a high specific surface area em high pore volume in their carbon matrix, being their principal property to adsorb molecules in liquid and gas phase. Brazil imports all its molecular sieves, using them in several areas of science and technology and industrial segments. Petroleum coke is a high carbon content residue with low ash content, and due to its amorphous structure have low comercial value, being considered an environmental and comercial problem. In this sense, the utilization of petroleum coke to produce AC and CMS becomes an atractive utilization of this residue. The objective of the present work was to study the synthesis of activated carbon by physical and chemical processes using as raw material the petroleum coke originated from the delayed coking unit from REPLAN PETROBRAS, evaluating the infiuence of process parameters, such as activating agent concentration, activation time, activation temperature and average particle size on the AC quality. The results of physical activation of petroleum coke was not satisfactory due to the low reactivity of the petroleum coke with the carbon dioxide. However, the petroleum coke presented higher reactivity with potassium hidroxide, given the possibility to develop an adequate methodology to chemically activate petroleum coke with KOH, in order to obtain activated carbon with high specific surface area. The results indicated the possibility to produce activated carbon materiaIs from petroleum coke with surface area higher than 2000 m2 .g-l

ASSUNTO(S)

active carbon adsorption adsorção porosity carbon molecular sieves coque de petroleo peneiras moleculares petroleum coke porosidade carbono ativo

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