scholarly journals Improved Catalytic Transfer Hydrogenation of Levulinate Esters with Alcohols over ZrO2 Catalyst

2020 ◽  
Vol 2 (1) ◽  
pp. 28
Author(s):  
Tommaso Tabanelli ◽  
Paola Blair Vásquez ◽  
Emilia Paone ◽  
Rosario Pietropaolo ◽  
Nikolaos Dimitratos ◽  
...  
Keyword(s):  
Gas Flow ◽  
Agricultural Waste ◽  
High Surface ◽  
High Surface Area ◽  
Tetragonal Zirconia ◽  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
Flow Conditions ◽  
Catalytic Transfer ◽  
Alkyl Levulinates

Levulinic acid (LA) and its esters (alkyl levulinates) are polyfunctional molecules that can be obtained from lignocellulosic biomass. Herein, the catalytic conversion of methyl and ethyl levulinates into γ-valerolactone (GVL) via catalytic transfer hydrogenation (CTH) by using methanol, ethanol, and 2-propanol as the H-donor/solvent, was investigated under both batch and gas-flow conditions. In particular, high-surface-area, tetragonal zirconia has proven to be a suitable catalyst for this reaction. Isopropanol was found to be the best H-donor under batch conditions, with ethyl levulinate providing the highest yield in GVL. However, long reaction times and high autogenic pressures are needed in order to work in the liquid-phase at high temperature with light alcohols. The reactions occurring under continuous gas-flow conditions, at atmospheric pressure and a relatively low contact time (1 s), were found to be much more efficient, also showing excellent GVL yields when EtOH was used as the reducing agent (GVL yield of around 70% under optimized conditions). The reaction has also been tested using a true bio-ethanol, derived from agricultural waste. These results represent the very first examples of the CTH of alkyl levulinates under continuous gas-flow conditions reported in the literature.

An overview of the obtaining of biomass-derived gamma-valerolactone from levulinic acid or esters without H2 supply

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 8417-8444
Author(s):  
Giselle González ◽  
María C. Area
Keyword(s):  
Levulinic Acid ◽  
High Pressures ◽  
High Surface ◽  
High Surface Area ◽  
Transfer Hydrogenation ◽  
Raw Material ◽  
Secondary Alcohols ◽  
Hydrogen Donors ◽  
Subsequent Cyclization ◽  
Catalytic Transfer

Gamma-valerolactone (GVL) is a highly reactive keto-lactone and a promising platform biomolecule, used as an additive for food and fuels, green solvent, and fuels precursor, among others. Its production from biomass usually involves hydrogenation and subsequent cyclization of levulinic acid or its esters. The process of conventional hydrogenation requires high pressures and temperatures, an external hydrogen source, and scarce noble/precious materials as catalysts. However, it could be produced under mild conditions, using bifunctional metal-acid catalysts with high metal dispersion and meso or microporosity, high surface area, temperatures lower than 200 °C, pressures ≤ 1MPa, and secondary alcohols (such as isopropanol) as hydrogen donors. The catalytic transfer hydrogenation followed by cyclization (CTHC) of levulinic acid (LA) and its esters (LE) to produce GVL using secondary alcohols as H donor is a great alternative. Variables involved in CTHC such as raw material, time, temperature, and type of catalyst, mainly transition metals and their combinations, are reviewed in this work.

scholarly journals An overview of the obtaining of biomass-derived gamma-valerolactone from levulinic acid or esters without H2 supply

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 8417-8444
Author(s):  
Giselle González ◽  
María C. Area
Keyword(s):  
Levulinic Acid ◽  
High Pressures ◽  
High Surface ◽  
High Surface Area ◽  
Transfer Hydrogenation ◽  
Raw Material ◽  
Secondary Alcohols ◽  
Hydrogen Donors ◽  
Subsequent Cyclization ◽  
Catalytic Transfer

Gamma-valerolactone (GVL) is a highly reactive keto-lactone and a promising platform biomolecule, used as an additive for food and fuels, green solvent, and fuels precursor, among others. Its production from biomass usually involves hydrogenation and subsequent cyclization of levulinic acid or its esters. The process of conventional hydrogenation requires high pressures and temperatures, an external hydrogen source, and scarce noble/precious materials as catalysts. However, it could be produced under mild conditions, using bifunctional metal-acid catalysts with high metal dispersion and meso or microporosity, high surface area, temperatures lower than 200 °C, pressures ≤ 1MPa, and secondary alcohols (such as isopropanol) as hydrogen donors. The catalytic transfer hydrogenation followed by cyclization (CTHC) of levulinic acid (LA) and its esters (LE) to produce GVL using secondary alcohols as H donor is a great alternative. Variables involved in CTHC such as raw material, time, temperature, and type of catalyst, mainly transition metals and their combinations, are reviewed in this work.

Ruthenium (ii) complexes with c- and c-symmetric bis-(+)-camphopyrazole ligands and their evaluation in catalytic transfer hydrogenation of aldehydes

2021 ◽  
pp. 120429
Author(s):  
Christian O. Blanco ◽  
Ligia Llovera ◽  
Alberto Herrera ◽  
Romano Dorta ◽  
Giuseppe Agrifoglio ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
Catalytic Transfer

Influence of metal oxide and heteropoly tungustate location in mesoporous silica towards catalytic transfer hydrogenation of furfural to γ-valerolactone

2021 ◽  
Author(s):  
Bolla Srinivasarao ◽  
Yogita Y ◽  
Dhana Lakshmi Darsi ◽  
Krishna Kumari Pamula ◽  
N. Lingaiah
Keyword(s):  
Mesoporous Silica ◽  
Metal Oxide ◽  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
One Pot ◽  
Catalytic Transfer

One pot conversion of furfural to -valerolactone by transfer hydrogenation has been achieved over bifunctional Zr and TPA located in mesoporous silica catalysts. Different catalysts with TPA and ZrO2 located...

Synergistic Effect of B and N Dopants in Catalytic Transfer Hydrogenation

2018 ◽  
Vol 7 (6) ◽  
pp. 1107-1112 ◽  
Author(s):  
Yunrui Zhang ◽  
Yingying Zhai ◽  
Minzhe Chu ◽  
Li Huo ◽  
Haijun Wang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
Catalytic Transfer

Transfer hydrogenation of biomass-derived levulinic acid to γ-valerolactone over supported Ni catalysts

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 59753-59761 ◽  
Author(s):  
A. M. Hengne ◽  
B. S. Kadu ◽  
N. S. Biradar ◽  
R. C. Chikate ◽  
C. V. Rode
Keyword(s):  
Levulinic Acid ◽  
Transfer Hydrogenation ◽  
Complete Conversion ◽  
Catalytic Transfer Hydrogenation ◽  
Ni Catalysts ◽  
Catalytic Transfer ◽  
Supported Ni Catalysts ◽  
Supported Ni

A bifunctional Ni/MMT catalyst for catalytic transfer hydrogenation of levulinic acid to γ-valerolactone with complete conversion and selectivity.

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