Valorization of Lignin by Partial Wet Oxidation Using Sustainable Heteropoly Acid Catalysts

Demesa, Abayneh Getachew; Лаари, Арто; Sillanpää, Mika; Koiranen, Tuomas

doi:10.3390/molecules22101625

Cited by 33 publications

(15 citation statements)

References 43 publications

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“…. ) acids [347,348]. Since elemental chlorine-free paper took the use of chlorine off the pulping sector, this oxidant has not been taken into account for lignin oxidation and has been replaced by wet air [349][350][351], steam [352][353][354], pure oxygen [355,356], ozone [357][358][359], hydrogen peroxide [360][361][362], and peroxy acids [363].…”

Section: Oxidative Conversionmentioning

confidence: 99%

“…Among metals, noble metals like palladium can be highlighted [366,367], while CuO, Mn 3 O 4 and CoO 3 can be mentioned as examples of metal oxides [368,369]. Two different polyoxometalates, phosphomolybdic and phosphotungstic acids, have shown different catalytic behaviors and the reaction pathways of lignin oxidation to carboxylic acids [348]. Inspired on natural enzymes, taking manganese peroxidase as the most illustrative example, biomimetic catalysts with metallic core and organic ligands have been tested for lignin oxidative conversion.…”

Section: Oxidative Conversionmentioning

confidence: 99%

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Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period

2018

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A complete bibliometric analysis of the Scopus database was performed to identify the research trends related to lignin valorization from 2000 to 2016. The results from this analysis revealed an exponentially increasing number of publications and a high relevance of interdisciplinary collaboration. The simultaneous valorization of the three main components of lignocellulosic biomass (cellulose, hemicellulose, and lignin) has been revealed as a key aspect and optimal pretreatment is required for the subsequent lignin valorization. Research covers the determination of the lignin structure, isolation, and characterization; depolymerization by thermal and thermochemical methods; chemical, biochemical and biological conversion of depolymerized lignin; and lignin applications. Most methods for lignin depolymerization are focused on the selective cleavage of the β-O-4 linkage. Although many depolymerization methods have been developed, depolymerization with sodium hydroxide is the dominant process at industrial scale. Oxidative conversion of lignin is the most used method for the chemical lignin upgrading. Lignin uses can be classified according to its structure into lignin-derived aromatic compounds, lignin-derived carbon materials and lignin-derived polymeric materials. There are many advances in all approaches, but lignin-derived polymeric materials appear as a promising option.

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Section: Oxidative Conversionmentioning

confidence: 99%

Section: Oxidative Conversionmentioning

confidence: 99%

Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period

2018

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“…Interest in renewable feedstock for the chemical industry has increased considerably over the last decades, mainly due to environmental concerns and foreseeable shortage of fossil raw materials. Lignocellulosic biomass is an abundant source of bio-based raw material that is readily available and can be utilized as an alternative source for chemical production [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Black Liquor from Date Palm on the Workability and Compressive Strength of Portland Cement and Concrete

Irekti

Oualit

Siahmed

et al. 2019

Advances in Materials Science

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Lignin is the second most abundant natural polymer. Due to the high content of carbon and hydrogen (C-H, C-C, C=O), it can be used as a potential dispersant for cement matrix. The objective of this study is to extract lignin from date palm and study its effect in the form of black liquor (BL) on the rheological and physic-mechanical properties of the cements and concrete. The lignin in black liquor form represents approximately 30 wt% dry weight of date palm. It is a heteropolymer composed primarily of methoxylated phenylpropylene alcohol monomeric units interconnected by a variety of stable carbon-carbon and carbon-oxygen-carbon (ether and esters) linkages. The results found show the positive effect on the workability of cement and concrete and confirms its dispersion effect by improving compressive strength of concrete during the early and the later ages of hydration.

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“…This positioning of lignin is borne out of its cost-effectiveness, sustainability and ability to directly meet requirements for applications, or with modification in some cases. Although, lignin can be valorized into a wide range of chemicals and biomaterials, it is still underutilized when compared to cellulose [ 9 ]. Commercial scale development of lignin and its derivatives still requires evaluation and trade-offs between economics of scale, environmental impacts, products standards to facilitate trade, market trends and products aesthetics [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Quantification and Variability Analysis of Lignin Optical Properties for Colour-Dependent Industrial Applications

et al. 2018

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Lignin availability has increased significantly due to the commercialization of several processes for recovery and further development of alternatives for integration into Kraft pulp mills. Also, progress in lignin characterization, understanding of its chemistry as well as processing methods have resulted in the identification of novel lignin-based products and potential derivatives, which can serve as building block chemicals. However, all these have not led to the successful commercialization of lignin-based chemicals and materials. This is because most analyses and characterizations focus only on the technical suitability and quantify only the composition, functional groups present, size and morphology. Optical properties, such as the colour, which influences the uptake by users for diverse applications, are neither taken into consideration nor analysed. This paper investigates the quantification of lignin optical properties and how they can be influenced by process operating conditions. Lignin extraction conditions were also successfully correlated to the powder colour. About 120 lignin samples were collected and the variability of their colours quantified with the CIE L*a*b* colour space. In addition, a robust and reproducible colour measurement method was developed. This work lays the foundation for identifying chromophore molecules in lignin, as a step towards correlating the colour to the functional groups and the purity.

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Valorization of Lignin by Partial Wet Oxidation Using Sustainable Heteropoly Acid Catalysts

Cited by 33 publications

References 43 publications

Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period

Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period

Effect of Black Liquor from Date Palm on the Workability and Compressive Strength of Portland Cement and Concrete

Quantification and Variability Analysis of Lignin Optical Properties for Colour-Dependent Industrial Applications

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