scholarly journals Ru-(Mn-M)OX Solid Base Catalysts for the Upgrading of Xylitol to Glycols in Water

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 331 ◽  
Author(s):  
Maxime Rivière ◽  
Noémie Perret ◽  
Damien Delcroix ◽  
Amandine Cabiac ◽  
Catherine Pinel ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Carboxylic Acids ◽  
Aldol Reactions ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Dispersed ◽  
Co Precipitation

A series of Ru-(Mn-M)OX catalysts (M: Al, Ti, Zr, Zn) prepared by co-precipitation were investigated in the hydrogenolysis of xylitol in water to ethylene glycol, propylene glycol and glycerol at 200 °C and 60 bar of H2. The catalyst promoted with Al, Ru-(Mn-Al)OX, showed superior activity (57 h−1) and a high global selectivity to glycols and glycerol of 58% at 80% xylitol conversion. In comparison, the catalyst prepared by loading Ru on (Mn-Al)OX, Ru/(Mn-Al)OX was more active (111 h−1) but less selective (37%) than Ru-(Mn-Al)OX. Characterization of these catalysts by XRD, BET, CO2-TPD, NH3-TPD and TEM showed that Ru/(Mn-Al)OX contained highly dispersed and uniformly distributed Ru particles and fewer basic sites, which favored decarbonylation, epimerization and cascade decarbonylation reactions instead of retro-aldol reactions producing glycols. The hydrothermal stability of Ru-(Mn-Al)OX was improved by decreasing the xylitol/catalyst ratio, which decreased the formation of carboxylic acids and enabled recycling of the catalyst, with a very low deactivation.

Supported La2O3and MgO Nanoparticles as Solid Base Catalysts for Aldol Reactions While Suppressing Dehydration at Room Temperature

ChemCatChem ◽  
2012 ◽  
Vol 5 (2) ◽  
pp. 594-600 ◽  
Author(s):  
Anne Mette Frey ◽  
Sanjib Kumar Karmee ◽  
Krijn Pieter de Jong ◽  
Johannes Hendrik Bitter ◽  
Ulf Hanefeld
Keyword(s):  
Room Temperature ◽  
Aldol Reactions ◽  
Solid Base ◽  
Mgo Nanoparticles ◽  
Solid Base Catalysts ◽  
Base Catalysts

Production of novel biodiesel from transesterification over KF-modified Ca–Al hydrotalcite catalyst

RSC Advances ◽  
2014 ◽  
Vol 4 (104) ◽  
pp. 60025-60033 ◽  
Author(s):  
Juan Chen ◽  
Lihua Jia ◽  
Xiangfeng Guo ◽  
Lijun Xiang ◽  
Shengfeng Lou
Keyword(s):  
Ethylene Glycol ◽  
Monomethyl Ether ◽  
Solid Base ◽  
Ethylene Glycol Monomethyl Ether ◽  
Glycol Monomethyl Ether ◽  
Solid Base Catalysts ◽  
Base Catalysts

A series of KF-modified Ca–Al hydrotalcite (xKF/HTL-M) solid base catalysts was prepared in methanol, and used in the production of a novel biodiesel of ethylene glycol monomethyl ether monolaurate.

Sustainable Synthesis of Vinyl Methyl Ether from Biomass-derived Ethylene Glycol Dimethyl Ether over Solid Base Catalysts

2021 ◽  
Author(s):  
Xin He ◽  
Xin Wen ◽  
Ke Wu ◽  
Haichao Liu
Keyword(s):  
Ethylene Glycol ◽  
Methyl Ether ◽  
Functional Polymers ◽  
Solid Base ◽  
Fine Chemicals ◽  
Vinyl Methyl ◽  
Solid Base Catalysts ◽  
Vinyl Methyl Ether ◽  
Base Catalysts ◽  
Ethylene Glycol Dimethyl Ether

Vinyl methyl ether (VME) is an important chemical intermediate for the production of functional polymers and fine chemicals. It is primarily produced in industry via the addition of methanol to...

scholarly journals Ketone Formation via Decarboxylation Reactions of Fatty Acids Using Solid Hydroxide/Oxide Catalysts

Inorganics ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 121 ◽  
Author(s):  
Benjamin Smith ◽  
Li Li ◽  
Diego Perera-Solis ◽  
Louise Gildea ◽  
Vladimir Zholobenko ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Mixed Metal Oxide ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Oxide Phases ◽  
Synthetic Routes ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Ketone Formation

A sustainable route to ketones is described where stearone is produced via ketonic decarboxylation of stearic acid mediated by solid base catalysts in yields of up to 97%, at 250 °C. A range of Mg/Al layered double hydroxide (LDH) and mixed metal oxide (MMO) solid base catalysts were prepared with Mg/Al ratios of between 2 and 6 via two synthetic routes, co-precipitation and co-hydration, with each material tested for their catalytic performance. For a given Mg/Al ratio, the LDH and MMO materials showed similar reactivity, with no correlation to the method of preparation. The presence of co-produced oxide phases in the co-hydration catalysts had negligible impact on reactivity.

Fine-crystallized LDHs prepared with SiO2 spheres as highly active solid base catalysts

2017 ◽  
Vol 5 (15) ◽  
pp. 6947-6957 ◽  
Author(s):  
Mahiro Shirotori ◽  
Shun Nishimura ◽  
Kohki Ebitani
Keyword(s):  
Layered Double Hydroxides ◽  
Base Catalysis ◽  
Precipitation Method ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Active ◽  
Co Precipitation ◽  
Double Hydroxides ◽  
Sio2 Spheres

Fine-crystallized layered double hydroxides are prepared via the co-precipitation method with the coexistence of SiO2 spheres (SiO2@LDH), and their base catalysis and structural properties are investigated.

Supported mesoporous solid base catalysts for condensation of carboxylic acids

2011 ◽  
Vol 278 (2) ◽  
pp. 189-199 ◽  
Author(s):  
Ambareesh D. Murkute ◽  
James E. Jackson ◽  
Dennis J. Miller
Keyword(s):  
Carboxylic Acids ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

Self-condensation of propanol over solid-base catalysts

2004 ◽  
Vol 275 (1-2) ◽  
pp. 103-110 ◽  
Author(s):  
A.S. Ndou ◽  
N.J. Coville
Keyword(s):  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts
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