Iron porphyrins immobilised on silica surface and encapsulated in silica matrix: a comparison of their catalytic activity in hydrocarbon oxidation - Moreira, Maria Silvia Monsalves; Martins, Patricia Riul; Curi, Rebeca Benedini; Nascimento, Otaciro Rangel; Iamamoto, Yassuko (Journal of Molecular Catalysis A, 2005)