Ru and Ag promoted Co/Al2O3 catalysts for the gas-phase amination of aliphatic alcohols with ammonia

2018 ◽  
Vol 8 (22) ◽  
pp. 5858-5874 ◽  
Author(s):  
J. Ibáñez ◽  
B. T. Kusema ◽  
S. Paul ◽  
M. Pera-Titus
Keyword(s):  
Gas Phase ◽  
Noble Metal ◽  
Aliphatic Alcohols ◽  
Primary Amines ◽  
Cobalt Loading ◽  
Metal Doped ◽  
Long Chain

The present paper describes the synthesis of primary amines from long-chain aliphatic alcohols and ammonia using alumina-supported noble metal doped cobalt formulations with moderate cobalt loading (5 wt%).

Photodissociation of Noble Metal-Doped Carbon Clusters

2008 ◽  
Vol 112 (48) ◽  
pp. 12355-12366 ◽  
Author(s):  
B. W. Ticknor ◽  
B. Bandyopadhyay ◽  
M. A. Duncan
Keyword(s):  
Noble Metal ◽  
Carbon Clusters ◽  
Metal Doped

scholarly journals Differences in the Catalytic Behavior of Au-Metalized TiO2 Systems During Phenol Photo-Degradation and CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 331 ◽  
Author(s):  
Oscar Laguna ◽  
Julie Murcia ◽  
Hugo Rojas ◽  
Cesar Jaramillo-Paez ◽  
Jose Navío ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Gas Phase ◽  
Noble Metal ◽  
Oxidation Reaction ◽  
Considerable Increase ◽  
Deposition Time ◽  
Phenol Degradation ◽  
Photo Degradation ◽  
Co Oxidation Reaction ◽  
Phenol Conversion

For this present work, a series of Au-metallized TiO2 catalysts were synthesized and characterized in order to compare their performance in two different catalytic environments: the phenol degradation that occurs during the liquid phase and in the CO oxidation phase, which proceeds the gas phase. The obtained materials were analyzed by different techniques such as XRF, SBET, XRD, TEM, XPS, and UV-Vis DRS. Although the metallization was not totally efficient in all cases, the amount of noble metal loaded depended strongly on the deposition time. Furthermore, the differences in the amount of loaded gold were important factors influencing the physicochemical properties of the catalysts, and consequently, their performances in the studied reactors. The addition of gold represented a considerable increase in the phenol conversion when compared with that of the TiO2, despite the small amount of noble metal loaded. However, this was not the case in the CO oxidation reaction. Beyond the differences in the phase where the reaction occurred, the loss of catalytic activity during the CO oxidation reaction was directly related to the sintering of the gold nanoparticles.

scholarly journals Role of reactive oxygen species on the activity of noble metal-doped TiO2 photocatalysts

2019 ◽  
Vol 372 ◽  
pp. 45-51 ◽  
Author(s):  
Paula Ribao ◽  
Juan Corredor ◽  
Maria J. Rivero ◽  
Inmaculada Ortiz
Keyword(s):  
Reactive Oxygen Species ◽  
Noble Metal ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Tio2 Photocatalysts ◽  
Doped Tio2 ◽  
Metal Doped

Non-noble metal doped perovskite as a promising catalyst for ammonia borane dehydrogenation

2020 ◽  
Vol 351 ◽  
pp. 6-11 ◽  
Author(s):  
David Salinas-Torres ◽  
Miriam Navlani-García ◽  
Yasutaka Kuwahara ◽  
Kohsuke Mori ◽  
Hiromi Yamashita
Keyword(s):  
Noble Metal ◽  
Ammonia Borane ◽  
Metal Doped

scholarly journals Gas-Phase Epoxidation of Propylene to Propylene Oxide on a Supported Catalyst Modified with Various Dopants

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 638 ◽  
Author(s):  
Sugiyama ◽  
Sakuwa ◽  
Ogino ◽  
Sakamoto ◽  
Shimoda ◽  
...  
Keyword(s):  
Gas Phase ◽  
Propylene Oxide ◽  
Active Catalyst ◽  
Supported Catalyst ◽  
Acid Base ◽  
Epoxidation Of Propylene ◽  
Highly Active ◽  
Acidic Catalysts ◽  
Carbonate Species ◽  
Metal Doped

In the present study, the production of propylene oxide (PO) from propylene via gas-phase epoxidation was investigated using various catalysts. Although Ag is known to be a highly active catalyst for the epoxidation of ethylene, it was not active in the present reaction. Both Al and Ti showed high levels of activity, however, which resulted in confusion. The present study was conducted to solve such confusion. Although the employment of MCM-41 modified with Ti and/or Al was reported as an active catalyst for epoxidation, the combination resulted in the formation of PO at a less than 0.1% yield. Since this research revealed that the acidic catalyst seemed favorable for the formation of PO, versions of ZSM-5 that were both undoped and doped with Na, Ti, and Ag were used as catalysts. In these cases, small improvements of 0.67% and 0.57% were achieved in the PO yield on H‒ZSM-5 and Ti‒ZSM-5, respectively. Based on the results of the Ti-dopant and acidic catalysts, Ag metal doped on carbonate species with a smaller surface area was used as a catalyst. As reported, Ag‒Na/CaCO3 showed a greater yield of PO at 1.29%. Furthermore, the use of SrCO3 for CaCO3 resulted in a further improvement in the PO yield to 2.17%. An experiment using CO2 and NH3 pulse together with SEM and TEM examinations for Ag‒Na/CaCO3 revealed that the greatest activity was the result of the greater particle size of metallic Ag rather than the acid‒base properties of the catalysts.

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