Progress of catalytic wet air oxidation technology

Jing, Guolin; Luan, Mingming; Chen, Tingting

doi:10.1016/j.arabjc.2012.01.001

Cited by 73 publications

(25 citation statements)

References 34 publications

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“…Although noble metal is expensive, the catalytic activity is better. Components of noble metals are more stable; therefore, the stability of noble metal catalyst mainly depends on the stability of the support [62].…”

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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“…• are formed in the reaction system and were involved in a chain reaction that is divided into three phases including initiation, propagation and termination of free radicals. Co-oxidation is the dominant mechanism in the WAO process which involves the oxidation of organic molecules by free radical intermediates formed from another organic compound (Kim and Ihm, 2011;Jing et al, 2016;Luan et al, 2017). As depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The WAO systems and mechanism have been studied by previous researchers (Zhou et al, 2018;Kim and Ihm, 2011;Jing et al, 2016;Luan et al, 2017;Padoley et al, 2012b). Since the reaction mechanism of WAO is very complex, the definite mechanisms and reaction pathways for WAO of organic substances have not been presented even for a pure substance.…”

Section: Mineralization and Biodegradability Studies Of Treated Pcwmentioning

confidence: 99%

“…This phenomena is related to the intermediates generated during degradation of organic compounds in the WAO process. The oxidation of organic compounds in the WAO process involves several pathways and resulted in the formation of various intermediates, such as short-chain carboxylic acids, including acetic acid, formic acid, oxalic acid, etc., regardless of the initial organic substance, which are suitable substrates for biological treatment (Kim and Ihm, 2011;Jing et al, 2016). It has been proven, by indirect analysis of changing pH during the reaction process, that basic pH in raw wastewater (about 8.5) become slightly acidic in treated wastewater (about 6.5), which can only be due to the formation of short-chain car- boxylic acids.…”

Section: Mineralization and Biodegradability Studies Of Treated Pcwmentioning

confidence: 99%

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Enhanced degradation of Bisphenol A from high saline polycarbonate plant wastewater using wet air oxidation

Mirzaee

Jaafarzadeh

Jorfi

et al. 2018

Process Safety and Environmental Protection

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a b s t r a c tIn the present study, wet air oxidation (WAO) was investigated for the decomposition of bisphenol A (BPA) in high saline polycarbonate plant wastewater (PCW). The main operating conditions of the WAO process that affects the degradation efficiency, including temperature, total air pressure and reaction time were studied. The results indicate that complete BPA degradation is achieved in pH 8.5, temperature = 150 • C, total air pressure of 3 MPa and 120 min. In addition, by prolonging the reaction time to 24 h, removals of 62% and 37%, were obtained regarding chemical oxygen demand (COD) and total oxygen carbon (TOC), respectively. The intermediates of BPA degradation generated in aqueous solution by the WAO process were identified and the proposed plausible mechanism was reported. Under optimum experimental conditions, the biodegradability of treated PCW after WAO process was shown to significantly improve, by analysis of biodegradability index, including BOD 5 /COD ratio, values of average oxidation state (AOS) and carbon oxidation state (COS). The WAO process was found to be an effective method to degrade highly toxic organic matter in high saline industrial wastewater such as PCW. The results indicate that WAO, as a pretreatment technology, is an economic and eco-friendly method for the treatment of PCW.

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“…Multifunctional catalysts have also been proposed for the treatment of nitrogenous organic compounds. More information on catalytic wet air oxidation processes for the treatment of refractory organic pollutants and industrial wastewaters can be found in recent review papers [88][89][90]. When the oxidation is performed with hydrogen peroxide instead of oxygen, the process is designated as wet peroxide oxidation (WPO) and the corresponding catalytic oxidation process is referred to as CWPO.…”

Section: Liquid Phase-solid Catalyst Total Oxidation Reactionsmentioning

confidence: 99%

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

Valange

Védrine

2018

Catalysts

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In this review paper, we have assembled the main characteristics of partial oxidation reactions (oxidative dehydrogenation and selective oxidation to olefins or oxygenates, as aldehydes and carboxylic acids and nitriles), as well as total oxidation, particularly for depollution, environmental issues and wastewater treatments. Both gas–solid and liquid–solid media have been considered with recent and representative examples within these fields. We have also discussed about their potential and prospective industrial applications. Particular attention has been brought to new raw materials stemming from biomass, as well as to liquid–solid catalysts cases. This review paper also summarizes the progresses made in the use of unconventional activation methods for performing oxidation reactions, highlighting the synergy of these technologies with heterogeneous catalysis. Focus has been centered on both usual catalysts activation methods and less usual ones, such as the use of ultrasounds, microwaves, grinding (mechanochemistry) and photo-activated processes, as well as their combined use.

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Progress of catalytic wet air oxidation technology

Cited by 73 publications

References 34 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

Enhanced degradation of Bisphenol A from high saline polycarbonate plant wastewater using wet air oxidation

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

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