Heteropolycompounds as catalysts for biomass product transformations

Sánchez, Laura M.; Thomas, Helen; Climent, María J.; Romanelli, Gustavo Pablo; Iborra, Sara

doi:10.1080/01614940.2016.1248721

Cited by 52 publications

(20 citation statements)

References 323 publications

(170 reference statements)

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“…into the vacant sites has been used to synthesize several metal-substituted POMs with controlled multinuclear active sites in both aqueous and organic media [7,11,23]. These molecular catalysts exhibit significant activity and selectivity for a wide range of reactions [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] [92][93][94].…”

Section: Transition-metal-substituted Polyoxometalatesmentioning

confidence: 99%

Base Catalysis by Mono- and Polyoxometalates

Kamata

Sugahara

2017

Catalysts

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Abstract:In sharp contrast with acid-, photo-, and oxidation-catalysis by polyoxometalates, base catalysis by polyoxometalates has scarcely been investigated. The use of polyoxometalates as base catalysts have very recently received much attention and has been extensively investigated. Numerous mono-and polyoxometalate base catalyst systems effective for the chemical fixation of CO 2 , cyanosilylation of carbonyl compounds, and C-C bond forming reactions have been developed. Mono-and polyoxometalate base catalysts are classified into four main groups with respect to their structures: (a) monomeric metalates; (b) isopolyoxometalates; (c) heteropolyoxometalates; and (d) transition-metal-substituted polyoxometalates. This review article focuses on the relationship among the molecular structures, the basic properties, and the unique base catalysis of polyoxometalates on the basis of groups (a)-(d). In addition, reaction mechanisms including the specific activation of substrates and/or reagents such as the abstraction of protons, nucleophilic action toward substrates, and bifunctional action in combination with metal catalysts are comprehensively summarized.

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Section: Transition-metal-substituted Polyoxometalatesmentioning

confidence: 99%

Base Catalysis by Mono- and Polyoxometalates

Kamata

Sugahara

2017

Catalysts

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“…Moreover, the locus of research activity on catalysis has moved from Europe in the 19th-20th centuries to the USA in the 20th century and now in the 21st century to Asia (Japan, Korea and China). Today, we see a new evolution of alternative fuel and new raw materials based on biomass [97,98], water splitting, etc. It appears that although great improvements and new developments were observed in the second part of the 20th century, there remains plenty of room for young researchers from academia and industry to discover and develop new metal oxide catalysts, new preparation procedures, and new or improved processes.…”

mentioning

confidence: 99%

Heterogeneous Catalysis on Metal Oxides

2017

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This review article contains a reminder of the fundamentals of heterogeneous catalysis and a description of the main domains of heterogeneous catalysis and main families of metal oxide catalysts, which cover acid-base reactions, selective partial oxidation reactions, total oxidation reactions, depollution, biomass conversion, green chemistry and photocatalysis. Metal oxide catalysts are essential components in most refining and petrochemical processes. These catalysts are also critical to improving environmental quality. This paper attempts to review the major current industrial applications of supported and unsupported metal oxide catalysts. Viewpoints for understanding the catalysts' action are given, while applications and several case studies from academia and industry are given. Emphases are on catalyst description from synthesis to reaction conditions, on main industrial applications in the different domains and on views for the future, mainly regulated by environmental issues. Following a review of the major types of metal oxide catalysts and the processes that use these catalysts, this paper considers current and prospective major applications, where recent advances in the science of metal oxide catalysts have major economic and environmental impacts.

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“…The heterogeneous catalysts are used more than homogeneous catalysts due to their high reactivity during the process and ease of catalyst separation [5]. The reusability of catalysts is critical from financial and environmental prospects [6]. Moreover, the different types of reactions and their mechanisms taking place at the active reaction sites of the catalysts are the key factors in the isomerization process.…”

Section: Introductionmentioning

confidence: 99%

“…Afterward, many other catalysts have been developed but operated at a high temperature with reduced conversion of naphtha due to their lower activity. Therefore, highly active dual function catalysts are developed in recent years that can be operated at a lower temperature with high conversion of naphtha [6]. The types of catalysts used for the isomerization process of light naphtha are mixed metal oxide-and zeolite-based catalysts [2].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the Pt-chlorinated alumina is the most active catalyst for isomerization, and they are operated at lower temperatures (20-130 °C). The mixed metal oxide catalysts are less reactive than Ptchlorinated alumina base catalyst, so they are operated at a relatively higher temperature (around 150 °C) [6][7][8]. The chlorinated alumina catalysts produce compounds with higher octane number.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New trends in improving gasoline quality and octane through naphtha isomerization: a short review

et al. 2018

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The octane enhancement of light straight run naphtha is one of the significant solid acid catalyzed processes in the modern oil refineries due to limitations of benzene, aromatics, and olefin content in gasoline. This paper aims to examine the role of various catalysts that are being utilized for the isomerization of light naphtha with an ambition to give an insight into the reaction mechanism at the active catalyst sites, and the effect of various contaminants on catalyst activity. In addition, different technologies used for isomerization process are evaluated and compared by different process parameters.

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Heteropolycompounds as catalysts for biomass product transformations

Cited by 52 publications

References 323 publications

Base Catalysis by Mono- and Polyoxometalates

Base Catalysis by Mono- and Polyoxometalates

Heterogeneous Catalysis on Metal Oxides

New trends in improving gasoline quality and octane through naphtha isomerization: a short review

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