scholarly journals Surface Lewis Acidity of Periphery Oxide Species as a General Kinetic Descriptor for CO2 Hydrogenation to Methanol on Supported Copper Nanoparticles

ACS Catalysis ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 10409-10417 ◽  
Author(s):  
Jonglack Kim ◽  
Bidyut B. Sarma ◽  
Eva Andrés ◽  
Norbert Pfänder ◽  
Patricia Concepción ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Co2 Hydrogenation ◽  
Lewis Acidity ◽  
Surface Lewis Acidity

Inverse gas chromatographic characterization of Porapak Q as an extractant of pollutants from aqueous media

2009 ◽  
Vol 63 (3) ◽  
Author(s):  
Nagy Moustafa ◽  
Doaa El-Desouki
Keyword(s):  
Gas Chromatography ◽  
Chemical Structure ◽  
Inverse Gas Chromatography ◽  
Aqueous Media ◽  
Lewis Acidity ◽  
Porapak Q ◽  
Chromatographic Characterization ◽  
Surface Lewis Acidity

AbstractThe surface of Porapak Q was characterized by inverse gas chromatography (IGC) carried out by the determination of dispersive and specific adsorption components of Porapak Q surface, calculating γsd and -ΔH as parameters, respectively. An interpretation was given based on the chemical structure of Porapak Q. The obtained results were confirmed through the surface Lewis acidity and basicity constants, K a and K b, respectively, correlating well with the determined thermodynamic parameters.

The role of copper particle size in low pressure methanol synthesis via CO2 hydrogenation over Cu/ZnO catalysts

2015 ◽  
Vol 5 (2) ◽  
pp. 869-881 ◽  
Author(s):  
Alejandro Karelovic ◽  
Patricio Ruiz
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Copper Nanoparticles ◽  
Significant Influence ◽  
Methanol Synthesis ◽  
Copper Particle ◽  
Low Pressure ◽  
Co2 Hydrogenation ◽  
Hydrogenation Of Carbon Dioxide

The size of copper nanoparticles exerts a significant influence on the selectivity of the hydrogenation of carbon dioxide to methanol.

scholarly journals Ultrasound-Assisted Hydrothermal Synthesis of V2O5/Zr-SBA-15 Catalysts for Production of Ultralow Sulfur Fuel

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 408
Author(s):  
Jesús Miguel Ramos ◽  
Jin An Wang ◽  
Sergio Odin Flores ◽  
Lifang Chen ◽  
Ulises Arellano ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Catalyst Concentration ◽  
Oxidative Desulfurization ◽  
Vanadium Content ◽  
Oxidation Catalysis ◽  
Lewis Acidity ◽  
Zirconium Doping ◽  
Ultrasound Assisted ◽  
Model Diesel ◽  
Surface Lewis Acidity

This work reports the results of the ultrasound-assisted hydrothermal synthesis of two sets of V2O5 dispersed on SBA-15 and Zr doped SBA-15 catalysts used for the oxidation of dibenzothiophene (DBT) in a model diesel via the combination of oxidation, catalysis, and extraction technical route. These catalysts contained Lewis acidity as major and Brønsted acidity as minor. The amount of acidity varied with the content of vanadia and zirconium doping. It was found that DBT conversion is very sensitive to the Lewis acidity. DBT conversion increased by increasing the vanadium content and correlated well with the amount of surface Lewis acidity. Under the optimal experimental condition (Reaction temperature: 60 °C, reaction time 40 min, catalyst concentration: 1 g/L oil; H2O2/DBT mole ratio = 10), the 30% V2O5/SBA-15 and 30% V2O5/Zr-SBA-15 catalysts could convert more than 99% of DBT. Two reaction pathways of DBT oxidation involving vanadia surface structure, Lewis acidity, and peroxometallic complexes were proposed. When the vanadia loading V2O5 ≤ 10 wt%, the oxidative desulfurization (ODS) went through the Pathway I; in the catalysts with moderate vanadia content (V2O5 = 20–30 wt%), ODS proceeded via the Pathways II or/and the Pathway I.

Thermal stability of size-selected copper nanoparticles: Effect of size, support and CO2 hydrogenation atmosphere

2020 ◽  
Vol 510 ◽  
pp. 145439 ◽  
Author(s):  
Mo Li ◽  
Alexandre Borsay ◽  
Mostapha Dakhchoune ◽  
Kun Zhao ◽  
Wen Luo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Copper Nanoparticles ◽  
Co2 Hydrogenation ◽  
Thermal Stability Of

Quantitative determination of oxygen defects, surface lewis acidity, and catalytic properties of mesoporous MoO3/SBA-15 catalysts

2018 ◽  
Vol 263 ◽  
pp. 100-114 ◽  
Author(s):  
Julio González ◽  
Jin An Wang ◽  
Lifang Chen ◽  
Maria Manríquez ◽  
José Salmones ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Catalytic Properties ◽  
Lewis Acidity ◽  
Oxygen Defects ◽  
Surface Lewis Acidity

Rapid, Non-Toxic Synthesis of Beta Zeolites

2018 ◽  
Author(s):  
Felix Hemmann ◽  
Jonathan Hackebeil ◽  
Andreas Lißner ◽  
Florian Mertens
Keyword(s):  
Hydrofluoric Acid ◽  
Molecular Sieves ◽  
Toxic Chemicals ◽  
Lewis Acidity ◽  
Beta Zeolite ◽  
Seeded Growth ◽  
Related Research ◽  
Beta Zeolites ◽  
Growth Method ◽  
Fast Synthesis

Molecular sieves with beta zeolite topology are promising catalysts for various reactions as they exhibits extraordinary Lewis acidity. However, their industrial application and related research in academica is hindered because their synthesis is time consuming and typically involves toxic chemicals as hydrofluoric acid. Therefore, tetraethylammonium fluorid was tested as a non-toxic fluotide source for the synthesis of beta zeolites. In combination with the previously reported nano-seeded growth method, a fast synthesis of beta zeolites only involving non-toxic chemicals was possible. Synthesized zeolites show comparable selectivity in the Bayer-Villinger oxidation as conventional zeolites synthesized with hydrofluoric acid.<br>

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