Oxidized caesium/nanoporous carbon materials: solid-base catalysts with highly-dispersed active sites

1999 ◽  
pp. 275-276 ◽  
Author(s):  
Mark G. Stevens ◽  
Denise Chen ◽  
Henry C. Foley
Keyword(s):  
Active Sites ◽  
Carbon Materials ◽  
Nanoporous Carbon ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Dispersed ◽  
Nanoporous Carbon Materials

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.

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

Solid base catalysts obtained from hydrotalcite precursors, for Knoevenagel synthesis of cinamic acid and coumarin derivatives

2006 ◽  
Vol 308 ◽  
pp. 13-18 ◽  
Author(s):  
E. Angelescu ◽  
O.D. Pavel ◽  
R. Bîrjega ◽  
R. Zăvoianu ◽  
G. Costentin ◽  
...  
Keyword(s):  
Solid Base ◽  
Coumarin Derivatives ◽  
Solid Base Catalysts ◽  
Base Catalysts

Metal-free ovalbumin-derived N-S-co-doped nanoporous carbon materials as efficient electrocatalysts for oxygen reduction reaction

2019 ◽  
Vol 467-468 ◽  
pp. 75-83 ◽  
Author(s):  
André L. Cazetta ◽  
Lucas Spessato ◽  
Karen C. Bedin ◽  
Isis P.F.A. Souza ◽  
Rafael A. Araújo ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Carbon Materials ◽  
Nanoporous Carbon ◽  
Reduction Reaction ◽  
Metal Free ◽  
Nanoporous Carbon Materials ◽  
Co Doped

scholarly journals Nitrogen-containing carbon nanotubes as solid base catalysts

2006 ◽  
pp. 4859 ◽  
Author(s):  
Stefan van Dommele ◽  
Krijn P. de Jong ◽  
Johannes H. Bitter
Keyword(s):  
Carbon Nanotubes ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts
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