Catalytic wet peroxide oxidation (CWPO) of phenol over mixed (AlCu)-pillared clays

Barrault, J.; Bouchoule, C.; Echachoui, K.; Frini-Srasra, N.; Trabelsi, Mahmoud; Bergaya, F.

doi:10.1016/s0926-3373(97)00054-4

Cited by 129 publications

(56 citation statements)

References 15 publications

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“…The d 001 value and SSA, as well as the content of Al and Fe or/and Cu, all increased significantly after pillaring, which indicated iron and copper were efficiently intercalated into the interlayer space of clay. Some study showed that Cu could not be pillared efficiently in the clays (Barrault et al, 1998). However, we here evidenced that Cu could be intercalated in an amount of 2 wt.%, similar to that obtained by Caudo et al (2007).…”

Section: Resultssupporting

confidence: 81%

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Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

Zhou

Zhang

et al. 2014

Applied Clay Science

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Al-Fe-, Al-Cu-, and Al-Fe-Cu-PILCs were synthesized, characterized and tested in the catalytic wet peroxide oxidation of 4-chlorophenol (4-CP). An apparent induction period followed by a rapid oxidation was observed during the Fenton-like reaction, and the whole reaction could be modeled well using a Fermi's kinetic equation (R 2 = 0.9938~0.9993). The generation of hydroxyl radicals (HO • ) from surface-catalyzed decomposition of H 2 O 2 was the oxidation cause whereas the dissolution of active metals was its result. Accordingly, induction period was the cause of heterogeneous surface activation (catalysis or modification) for more HO • formed by decreasing pH. 4-CP oxidation proceeded via 4-chlorocatechol (major) and hydroquinone (minor) pathways, along the formation of main intermediate (5-chloro-1,2,4-benzentriol). Finally besides CO 2 , H 2 O and Cl − two main compounds (I and II) formed, where the former was identified as 2,4-dioxopentanedioic acid whereas the latter as ferric-oxalate complex. There were marked structural and active differences between Al-Fe-PILC and Al-Cu-PILC in which compared to the latter, the former possessed higher SSA and activity but its optimal calcination temperature was lower and the induction time was also longer. In addition, compound II accounted for a considerable proportion in Al-Fe-PILC system whereas compound I was almost only component in Al-Cu-PILC system.

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Section: Resultssupporting

confidence: 81%

“…It was generally accepted that compared to Cu, Fe was easier to take part in the Al pillar, decorating the pillar or isomorphic substitution (Barrault et al, 1998;Galeano et al, 2010;Guélou et al, 2003). Therefore, there were fine structural and corresponding catalytic differences between Al-Fe-PILC and Al-Cu-PILC.…”

Section: Introductionmentioning

confidence: 99%

Catalytic wet peroxide oxidation of 4-chlorophenol over Al-Fe-, Al-Cu-, and Al-Fe-Cu-pillared clays: Sensitivity, kinetics and mechanism

Zhou

Zhang

et al. 2014

Applied Clay Science

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“…As técnicas de oxidação com ar ou com peróxido de hidrogênio foram bastante discutidas devido à importância desses métodos 30 . Os processos usuais de oxidação de correntes aquosas com ar geralmente requerem elevadas temperaturas e pressões, para se obter uma alta conversão dos produtos mais tóxicos e refratários.…”

Section: O Processo De Oxidação Com Arunclassified

“…Os processos usuais de oxidação de correntes aquosas com ar geralmente requerem elevadas temperaturas e pressões, para se obter uma alta conversão dos produtos mais tóxicos e refratários. Estes processos geralmente ocorrem entre 100 e 300 ºC em pressões de 1-10 MPa 30 . Devlin e Harris publicaram um estudo em 1984, sobre a oxidação não catalítica de fenol em solução aquosa, usando oxigê-nio molecular como oxidante na faixa de temperatura de 150-225 ºC e pressão total de 20,69 MPa.…”

Section: O Processo De Oxidação Com Arunclassified

“…Adicionalmente, as condições de reação requeridas para o uso do peróxido são próximas às condições ambientais (0,1-0,5 MPa, T< 80 o C), permitindo o abatimento de uma série de poluentes orgânicos sem um elevado consumo energético. Entretanto, o processo de oxidação do peróxido de hidrogênio é, atualmente, pouco utilizado de forma isolada, uma vez que sua ação pode ser potencializada pela combinação com sistemas catalíticos 30 . Os chamados processos de oxidação catalítica por peróxido, do tipo CWPO ("Catalytic Wet Peroxide Oxidation"), são mais potentes que aqueles que utilizam o oxidante isoladamente.…”

Section: O Processo De Oxidação Com Peróxido De Hidrogêniounclassified

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