Preparation of Palladium Metal Intercalated between Graphite Layers with Low Palladium Loading for Cinnamaldehyde Hydrogenation

2021 ◽  
Author(s):  
Mika Sodeno ◽  
Hidetaka Nanao ◽  
Masayuki Shirai
Keyword(s):  
Cinnamaldehyde Hydrogenation ◽  
Palladium Metal

scholarly journals Ruling Factors in Cinnamaldehyde Hydrogenation: Activity and Selectivity of Pt-Mo Catalysts

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 362
Author(s):  
Marta Stucchi ◽  
Maela Manzoli ◽  
Filippo Bossola ◽  
Alberto Villa ◽  
Laura Prati
Keyword(s):  
Photoelectron Spectroscopy ◽  
Pt Nanoparticles ◽  
Carbon Support ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Hydrogenation Catalysts ◽  
Cinnamaldehyde Hydrogenation ◽  
Transmission Electron ◽  
Heat Treated ◽  
Heating Treatment

To obtain selective hydrogenation catalysts with low noble metal content, two carbon-supported Mo-Pt bimetallic catalysts have been synthesized from two different molybdenum precursors, i.e., Na2MoO4 and (NH4)6Mo7O24. The results obtained by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) combined with the presence and strength of acid sites clarified the different catalytic behavior toward cinnamaldehyde hydrogenation. After impregnating the carbon support with Mo precursors, each sample was used either as is or treated at 400 °C in N2 flow, as support for Pt nanoparticles (NPs). The heating treatment before Pt deposition had a positive effect on the catalytic performance. Indeed, TEM analyses showed very homogeneously dispersed Pt NPs only when they were deposited on the heat-treated Mo/C supports, and XPS analyses revealed an increase in both the exposure and reduction of Pt, which was probably tuned by different MoO3/MoO2 ratios. Moreover, the different acid properties of the catalysts resulted in different selectivity.

Comparative study on a kilowatt-MPT-MS-based method with two ion polarity modes for the inert palladium metal

The Analyst ◽  
2021 ◽  
Author(s):  
Tao Jiang ◽  
Feng Jiang ◽  
Zemin Zhuo ◽  
Huaxin Liu ◽  
Bin Hu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Industrial Manufacturing ◽  
Palladium Metal

Inert metals are of much importance and play a key role in modern industrial manufacturing.

scholarly journals Selectivity control in Pt-catalyzed cinnamaldehyde hydrogenation

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Lee J. Durndell ◽  
Christopher M. A. Parlett ◽  
Nicole S. Hondow ◽  
Mark A. Isaacs ◽  
Karen Wilson ◽  
...  
Keyword(s):  
Cinnamaldehyde Hydrogenation ◽  
Selectivity Control ◽  
Pt Catalyzed

scholarly journals Continuous-flow Heck synthesis of 4-methoxybiphenyl and methyl 4-methoxycinnamate in supercritical carbon dioxide expanded solvent solutions

2013 ◽  
Vol 9 ◽  
pp. 2886-2897 ◽  
Author(s):  
Phei Li Lau ◽  
Ray W K Allen ◽  
Peter Styring
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Methyl Acrylate ◽  
Heck Reaction ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Product Distribution ◽  
Internal Diameter ◽  
Palladium Metal ◽  
Supercritical Carbon

The palladium metal catalysed Heck reaction of 4-iodoanisole with styrene or methyl acrylate has been studied in a continuous plug flow reactor (PFR) using supercritical carbon dioxide (scCO2) as the solvent, with THF and methanol as modifiers. The catalyst was 2% palladium on silica and the base was diisopropylethylamine due to its solubility in the reaction solvent. No phosphine co-catalysts were used so the work-up procedure was simplified and the green credentials of the reaction were enhanced. The reactions were studied as a function of temperature, pressure and flow rate and in the case of the reaction with styrene compared against a standard, stirred autoclave reaction. Conversion was determined and, in the case of the reaction with styrene, the isomeric product distribution was monitored by GC. In the case of the reaction with methyl acrylate the reactor was scaled from a 1.0 mm to 3.9 mm internal diameter and the conversion and turnover frequency determined. The results show that the Heck reaction can be effectively performed in scCO2 under continuous flow conditions with a palladium metal, phosphine-free catalyst, but care must be taken when selecting the reaction temperature in order to ensure the appropriate isomer distribution is achieved. Higher reaction temperatures were found to enhance formation of the branched terminal alkene isomer as opposed to the linear trans-isomer.

Structural characterization of pumice-supported silver-palladium metal clusters by means of XAFS and AWAXS

1999 ◽  
Vol 7 (1) ◽  
pp. 89-97 ◽  
Author(s):  
A. Balerna ◽  
L. Liotta ◽  
A. Longo ◽  
A. Martorana ◽  
C. Meneghini ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Metal Clusters ◽  
Silver Palladium ◽  
Palladium Metal

Synthesis of Polyester Amide by Carbonylation–Polycondensation Reaction Using Immobilized Palladium Metal Containing Ionic Liquid on SBA-15 as a Phosphine-Free Catalytic System

2015 ◽  
Vol 145 (3) ◽  
pp. 824-833 ◽  
Author(s):  
Anilkumar Satapathy ◽  
Sandip T. Gadge ◽  
Etty N. Kusumawati ◽  
Kei Harada ◽  
Takehiko Sasaki ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Catalytic System ◽  
Polycondensation Reaction ◽  
Palladium Metal

EFFECTS OF THE ELECTRONIC BAND SHAPE OF PALLADIUM METAL ON THE PROTON MODEL FOR HYDROGEN ABSORPTION

1965 ◽  
Vol 43 (6) ◽  
pp. 1665-1671 ◽  
Author(s):  
J. W. Simons ◽  
Ted B. Flanagan
Keyword(s):  
Hydrogen Absorption ◽  
Statistical Treatment ◽  
Original Model ◽  
Band Shape ◽  
Electronic Band ◽  
Critical Isotherm ◽  
Critical Composition ◽  
Improved Model ◽  
Electron Donation ◽  
Palladium Metal

The statistical treatment of the proton model for hydrogen absorption by palladium is extended to include a variation of the electron donation energy with hydrogen content, as determined by a density of states function for the combined 4d- and 5s-bands for palladium. This improved model gives better agreement with the high pressure limiting solubility data and the observed critical composition than the original model, when both are fitted to the critical isotherm by the same method. An apparent anomaly in the variation of the isosteric enthalpy of absorption with content is explained by the improved model.

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