Selective hydrogenation of amides to alcohols in water solvent over a heterogeneous CeO2-supported Ru catalyst

2018 ◽  
Vol 54 (54) ◽  
pp. 7503-7506 ◽  
Author(s):  
Masazumi Tamura ◽  
Susumu Ishikawa ◽  
Mii Betchaku ◽  
Yoshinao Nakagawa ◽  
Keiichi Tomishige
Keyword(s):  
Heterogeneous Catalyst ◽  
Reaction Temperature ◽  
Selective Hydrogenation ◽  
Ru Catalyst ◽  
Water Solvent ◽  
Selective Dissociation ◽  
Low Reaction Temperature

CeO2-supported Ru (Ru/CeO2) worked as an effective and reusable heterogeneous catalyst for the selective dissociation of the C–N bond in amides, particularly primary amides, with H2 in water solvent at low reaction temperature of 333 K.

Selective hydrogenation of cinnamaldehyde over carbon nanotube supported pd-ru catalyst

2006 ◽  
Vol 88 (2) ◽  
pp. 269-276 ◽  
Author(s):  
Jieshan Qiu ◽  
Hongzhe Zhang ◽  
Xiuna Wang ◽  
Hongmei Han ◽  
Changhai Liang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Selective Hydrogenation ◽  
Ru Catalyst ◽  
Supported Pd

Highly Selective Hydrogenation of Tetralin to cis ‐Decalin Using Ru Catalyst

2019 ◽  
Vol 4 (19) ◽  
pp. 5796-5798
Author(s):  
Qian Wang ◽  
Yunchan Hou ◽  
Haiyang Zhao ◽  
Yuqing Li ◽  
Aijing Jia
Keyword(s):  
Selective Hydrogenation ◽  
Ru Catalyst

Intensified-Fenton process for the treatment of phenol aqueous solutions

2014 ◽  
Vol 71 (3) ◽  
pp. 359-365 ◽  
Author(s):  
M. Isabel Pariente ◽  
Raúl Molina ◽  
Juan Antonio Melero ◽  
Juan Ángel Botas ◽  
Fernando Martínez
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Heterogeneous Catalyst ◽  
Reaction Temperature ◽  
Catalytic Performance ◽  
Fenton Process ◽  
Iron Species ◽  
Iron Extraction ◽  
Dissolved Iron ◽  
Iron Leaching

An intensified-Fenton process for the treatment of phenol aqueous solutions has been studied as a continuous catalytic wet hydrogen peroxide oxidation system. This process consists of coupling the catalytic activity of a heterogeneous Fenton-like catalyst with the homogeneous contribution of its dissolved iron species. Agglomerated mesoporous SBA-15 silica-supported iron oxide (Fe2O3/SBA-15) material was used as heterogeneous catalyst. The influence of the reaction temperature and the initial hydrogen peroxide dosages was studied in order to minimize the operation cost of the process. The catalytic performance of the process was assessed in terms of total organic carbon (TOC) and hydrogen peroxide conversions. Likewise, the stability of the solid Fenton-like catalyst was also evaluated in terms of the dissolved iron species. The increase of the reaction temperature enhanced the TOC conversion and reduced the iron leaching from the heterogeneous catalyst. These results were related to the degradation of oxalic acid as responsible for iron extraction by formation of soluble stable iron complexes into the aqueous medium. Finally, the use of a moderate hydrogen peroxide concentration (2.6 g/L) and milder temperatures (80–120 °C) has led to remarkable results of TOC and phenol reductions as well as oxidant efficiency through the intensified-Fenton process.

Hydrogen Production by Bio-Fuel Steam Reforming at Low Reaction Temperature

2011 ◽  
Author(s):  
Tsuyoshi Maeda ◽  
Toshio Shinoki ◽  
Jiro Funaki ◽  
Katsuya Hirata
Keyword(s):  
Reaction Temperature ◽  
Steam Reforming ◽  
High Performance ◽  
Space Velocity ◽  
Ethanol Conversion ◽  
Ethanol Steam Reforming ◽  
High Hydrogen ◽  
Low Reaction Temperature ◽  
Al2o3 Catalyst ◽  
Ethanol Steam

The authors reveal the dominant chemical reactions and the optimum conditions, supposing the design of ethanol steam-reforming reactors. Specifically speaking, experiments are conducted for Cu/ZnO/Al2O3 catalyst, together with those for Ru/Al2O3 catalyst for reference. Using a household-use-scale reactor with well-controlled temperature distributions, the authors compare experimental results with chemical-equilibrium theories. It has revealed by Shinoki et al. (2011) that the Cu/ZnO/Al2O3 catalyst shows rather high performance with high hydrogen concentration CH2 at low values of reaction temperature TR. Because, the Cu/ZnO/Al2O3 catalyst promotes the ethanol-steam-reforming and water-gas-shift reactions, but does not promote the methanation reaction. So, in the present study, the authors reveal that the Ru/Al2O3 catalyst needs high TR > 770 K for better performance than the Cu/ZnO/Al2O3 catalyst, and that the Ru/Al2O3 catalyst shows lower performance at TR < 770 K. Then, the Ru/Al2O3 catalyst is considered to activate all the three reactions even at low TR. Furthermore, concerning the Cu/ZnO/Al2O3 catalyst, the authors reveal the influences of liquid-hourly space velocity LHSV upon concentrations such as CH2, CCO2, CCO and CCH4 and the influence of LHSV upon the ethanol conversion XC2H5OH, in a range of LHSV from 0.05 h−1 to 0.8 h−1, at S/C = 3.0 and TR = 520 K. And, the authors reveal the influences of the thermal profile upon CH2, CCO2, CCO, CCH4 and XC2H5OH, for several LHSV’s. To conclude, with well-controlled temperatures, the reformed gas can be close to the theory. In addition, the authors investigate the influences of S/C.

Ru-Catalyzed Arene Hydrogenation: A Highly Efficient and Selective Process for Preparing Trans-Trans Isomer of 4,4'-Diamino-Dicyclohexy

2011 ◽  
Vol 393-395 ◽  
pp. 1413-1416
Author(s):  
Yu Xiang Wang ◽  
Dan Dan Li ◽  
Xing Huang ◽  
Ya Juan Zhao
Keyword(s):  
Reaction Time ◽  
Trans Isomer ◽  
Reaction Temperature ◽  
Selective Hydrogenation ◽  
Optimum Conditions ◽  
Highly Efficient ◽  
Arene Hydrogenation ◽  
Selective Process

The selective hydrogenation of 4,4'-methylenedianiline(MDA) over Ru/γ-Al2O3 was investigated in the presence of diamine and base. Under the optimum conditions: the reaction temperature of 448K, H2 pressure of 1100 psig , and reaction time of 5h, the conversion of 4,4'-methylenedianiline was close to 100% and the selectivity to trans-trans isomer of 4,4'-diamino-dicyclohexy was less than 20%.

Carbonation behavior of K2CO3/AC in low reaction temperature and CO2 concentration

2014 ◽  
Vol 254 ◽  
pp. 524-530 ◽  
Author(s):  
Chuanwen Zhao ◽  
Yafei Guo ◽  
Changhai Li ◽  
Shouxiang Lu
Keyword(s):  
Reaction Temperature ◽  
Co2 Concentration ◽  
Low Reaction Temperature

Unique nanocages of 12CaO·7Al2O3 boost heterolytic hydrogen activation and selective hydrogenation of heteroarenes over ruthenium catalyst

2017 ◽  
Vol 19 (3) ◽  
pp. 749-756 ◽  
Author(s):  
Tian-Nan Ye ◽  
Jiang Li ◽  
Masaaki Kitano ◽  
Hideo Hosono
Keyword(s):  
Selective Hydrogenation ◽  
Metal Catalysts ◽  
Solvent Free ◽  
Supported Metal Catalysts ◽  
Support Material ◽  
Hydrogen Activation ◽  
Free System ◽  
Ru Catalyst ◽  
System P ◽  
Solvent Free System

A unique nanoporous 12CaO·7Al2O3 support material for Ru catalyst exhibited highly efficient chemoselective and sustainable for the formation of heterocycle hydrogenated products that surpasses other supported-metal catalysts in a solvent-free system.

Controllable Fabrication of δ-MnO2 Microspheres and α-MnO2 Nanorods

2011 ◽  
Vol 284-286 ◽  
pp. 450-453
Author(s):  
Yong Chen ◽  
Ling Li ◽  
Hui Xu ◽  
Yu Zhen Hong ◽  
Hao Yang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrochloric Acid ◽  
Reaction Temperature ◽  
Ph Value ◽  
Open Environment ◽  
Structure And Morphology ◽  
Effects Of Ph ◽  
Low Reaction Temperature ◽  
Hcl Concentration ◽  
Controllable Fabrication

MnO2 nanostructure was synthesized via a redox reaction of potassium permanganate in hydrochloric acid solution below 100°C at open environment. The effects of pH value in solution and reaction temperature on the crystal structure and morphology of MnO2 were investigated. It was revealed that layer folded δ-MnO2 microspheres were obtained at low reaction temperature and low HCl concentration, whereas α-MnO2 single-crystal nanorods were fabricated with increasing reaction temperature and HCl concentration. The possible formation mechanism of δ-MnO2 microspheres and α-MnO2 nanorods is suggested.

Sign in / Sign up

Export Citation Format

Share Document