Catalytic wet-air oxidation of lignin in a three-phase reactor with aromatic aldehyde production

Sales, Fernando G.; Abreu, César Augusto Moraes de; Pereira, João Alexandre Ferreira da Rocha

doi:10.1590/s0104-66322004000200010

Cited by 49 publications

(33 citation statements)

References 4 publications

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“…It also indicated that wet catalytic oxidation may involve a free-radical chain mechanism, a redox mechanism, or an oxygen-transfer mechanism depending on the catalyst, nature of reactants, and reaction conditions. Sales et al [118] studied the palladium-supported on c-alumina as catalyst in the wet air oxidation of lignin obtained from sugarcane bagasse. A three-phase fluidized reactor, using atmospheric air as the oxidizer, was built for the purpose of producing aromatic aldehydes in continuous regime.…”

Section: Noble Metalsmentioning

confidence: 99%

Catalytic Conversion of Lignocellulosic Biomass to Value-Added Organic Acids in Aqueous Media

Lin

Liu

et al. 2014

Green Chemistry and Sustainable Technology

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The transition from today's fossil-based economy to a sustainable economy based on renewable biomass is driven by the concern of climate change and anticipation of dwindling fossil resources. Although biofuels are the central theme of the transition, biomass resources cannot completely replace petroleum. It is projected that biofuels can only supply up to 30 % of today's transportation fuel market even if all available domestic biomass resources are used for the production of liquid fuels. Therefore, transformation of biomass into high-value-added chemicals is advantageous to secure optimal use of the abundant, but limited, biomass resources from the economical and ecological perspective. Industry is increasingly considering bio-based chemical production as an attractive area for investment. The potential for chemical and polymer production from biomass is substantial. The US Department of Energy recently issued a report which listed 12 chemical building blocks considered as potential building blocks for the future. Organic acids (e.g., succinic, lactic, levulinic acid, etc.) are among the widely spread ''platform-molecules,'' which may be further converted into possibly derivable high-value-added chemicals. The transition from a fossil chemical industry to a renewable chemical industry will likewise depend on our ability to focus research and development efforts on the most promising alternatives. In this chapter, we review the emerging technologies on catalytic conversion of biomass to value-added organic acids in aqueous media.

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Section: Noble Metalsmentioning

confidence: 99%

Catalytic Conversion of Lignocellulosic Biomass to Value-Added Organic Acids in Aqueous Media

Lin

Liu

et al. 2014

Green Chemistry and Sustainable Technology

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“…Various types of catalysts from expensive noble metals [20][21][22] to inexpensive metal ions such as iron, copper, and cobalt have been extensively studied [23][24][25][26][27] for a lignin catalytic wet oxidation process. In general, the lignin conversion rate and the yield of aromatic aldehydes are enhanced significantly in catalytic processes compared with non-catalytic processes [28].…”

Section: Introductionmentioning

confidence: 99%

Alkaline Partial Wet Oxidation of Lignin for the Production of Carboxylic Acids

et al. 2015

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The production of carboxylic acids by partial wet oxidation of alkali lignin was studied experimentally. The factors influencing the different types of products, their yields and concentrations were investigated. Formic, acetic, succinic, oxalic, and glutaconic acid were the main identified products. Both the temperature and oxygen partial pressure are shown to have direct effects on the product yields whereas the lignin concentration has an indirect effect. At low lignin concentrations, the yield of products was relatively high. However, at higher concentrations, the yield decreased. By measuring the lignin molecular weight distributions, it is shown that this decrease is linked to repolymerization/condensation reactions of lignin fragments which compete with oxidative lignin depolymerization.

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“…Noble metal catalyst [5][6][7] were extensively studied for the CWAO process of lignin. However, noble metals are expensive, greatly affecting the economics of their potential commercial applications.…”

Section: Introductionmentioning

confidence: 99%

Perovskite-type Oxide LaMnO3: An Efficient and Recyclable Heterogeneous Catalyst for the Wet Aerobic Oxidation of Lignin to Aromatic Aldehydes

et al. 2008

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The perovskite-type oxide catalyst LaMnO 3 prepared by the sol-gel method was found to be an efficient heterogeneous and recyclable catalyst for the wet aerobic oxidation of lignin to aromatic aldehydes. The lignin conversion rate and the yield of each aromatic aldehyde were enhanced significantly by the catalytic process as compared with the non-catalyzed process. Moreover, the activity, specific surface area and perovskite-type structure of the LaMnO 3 catalyst remained nearly unchanged after five successive recycles of catalytic reactions.

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Catalytic wet-air oxidation of lignin in a three-phase reactor with aromatic aldehyde production

Cited by 49 publications

References 4 publications

Catalytic Conversion of Lignocellulosic Biomass to Value-Added Organic Acids in Aqueous Media

Catalytic Conversion of Lignocellulosic Biomass to Value-Added Organic Acids in Aqueous Media

Alkaline Partial Wet Oxidation of Lignin for the Production of Carboxylic Acids

Perovskite-type Oxide LaMnO3: An Efficient and Recyclable Heterogeneous Catalyst for the Wet Aerobic Oxidation of Lignin to Aromatic Aldehydes

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