scholarly journals Effects of ruthenium hydride species on primary amine synthesis by direct amination of alcohols over a heterogeneous Ru catalyst

2020 ◽  
Vol 11 (36) ◽  
pp. 9884-9890 ◽  
Author(s):  
Yusuke Kita ◽  
Midori Kuwabara ◽  
Satoshi Yamadera ◽  
Keigo Kamata ◽  
Michikazu Hara
Keyword(s):  
Primary Amine ◽  
Catalytic Performance ◽  
Direct Amination ◽  
Ruthenium Hydride ◽  
Ru Catalyst

Ru–MgO/TiO2 exhibited high catalytic performance for direct amination of alcohols based on the acceleration effects of MgO.

Influence of ZrO2 on catalytic performance of Ru catalyst in hydrolytic hydrogenation of cellulose towards γ-valerolactone

2016 ◽  
Vol 41 (20) ◽  
pp. 8688-8695 ◽  
Author(s):  
Małgorzata Wąchała ◽  
Jacek Grams ◽  
Witold Kwapiński ◽  
Agnieszka M. Ruppert
Keyword(s):  
Catalytic Performance ◽  
Ru Catalyst ◽  
Hydrolytic Hydrogenation

Catalytic Hydrogenation of Carboxamides with a Bifunctional Cp*Ru Catalyst Bearing an Imidazol-2-ylidene with a Protic Aminoethyl Side Chain

Synthesis ◽  
2019 ◽  
Vol 51 (12) ◽  
pp. 2542-2547 ◽  
Author(s):  
Teruhiro Kawano ◽  
Ryo Watari ◽  
Yoshihito Kayaki ◽  
Takao Ikariya
Keyword(s):  
Catalytic Hydrogenation ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Equimolar Amount ◽  
Silver Complex ◽  
Side Chain ◽  
Ru Catalyst ◽  
Temperature Conditions ◽  
Ru Complex ◽  
Mild Temperature

Synthesis of a Cp*Ru complex bearing an NH2-functionalized N-heterocyclic carbene (C–NH) was achieved by treatment of Cp*RuBr(isoprene) with an equimolar amount of a silver complex, which was generated from Ag2O and 1-(2-aminoethyl)-3-methylimidazolium bromide, in CH3CN at room temperature. The new Cp*RuBr(C–NH) complex showed a higher catalytic performance than the related Cp*RuCl(P–NH) and Cp*RuCl(N–NH) complexes. In the reaction of N-arylcarboxamides, the amine products were obtained in satisfactory yields under mild temperature conditions.

Carbon support surface effects in the catalytic performance of Ba-promoted Ru catalyst for ammonia synthesis

2018 ◽  
Vol 316 ◽  
pp. 230-236 ◽  
Author(s):  
Bingyu Lin ◽  
Yunjie Guo ◽  
Chenfeng Cao ◽  
Jun Ni ◽  
Jianxin Lin ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Surface Effects ◽  
Carbon Support ◽  
Catalytic Performance ◽  
Support Surface ◽  
Ru Catalyst

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

Optimizing electron density of nickel sulfide electrocatalysts through sulfur vacancy engineering for alkaline hydrogen evolution

2020 ◽  
Vol 8 (35) ◽  
pp. 18207-18214
Author(s):  
Dongbo Jia ◽  
Lili Han ◽  
Ying Li ◽  
Wenjun He ◽  
Caichi Liu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Electron Density ◽  
Rational Design ◽  
Nickel Sulfide ◽  
Catalytic Performance ◽  
Sulfide Catalysts ◽  
Sulfur Vacancy

A novel, rational design for porous S-vacancy nickel sulfide catalysts with remarkable catalytic performance for alkaline HER.

Regio-, Stereo- and Enantioselective α-Addition of Carbonyl Nucleo-philes to Allenamides Catalyzed by a Synergistic Copper/Enamine System

2020 ◽  
Author(s):  
Rémi Blieck ◽  
Sebastien Lemouzy ◽  
Marc Taillefer ◽  
Florian Monnier
Keyword(s):  
Catalytic System ◽  
Secondary Amine ◽  
Primary Amine ◽  
Synergistic Catalysis ◽  
Enantioselective Addition ◽  
Amine Catalysts

A dual copper/enamine catalytic system is found to enable an intermolecular enantioselective α-addition of various carbonyl nucleophiles to allenamides. Secondary amine catalysts allowed the highly enantioselective addition of aldehydes, while using primary amine catalysts led to the enantioselective addition of ketoester nucleophiles. The process was found to be highly regio-, stereo- and enantio-selective and represented the first allene hydrofunctionalization using an synergistic catalysis involving copper

Catalytic Resonance Theory: Parallel Reaction Pathway Control

2019 ◽  
Author(s):  
M. Alexander Ardagh ◽  
Manish Shetty ◽  
Anatoliy Kuznetsov ◽  
Qi Zhang ◽  
Phillip Christopher ◽  
...  
Keyword(s):  
Chemical Reactions ◽  
Active Site ◽  
Active Sites ◽  
Reaction Pathway ◽  
Control Strategies ◽  
Oscillation Amplitude ◽  
Catalytic Performance ◽  
Parallel Reaction ◽  
Resonance Theory ◽  
Static Conditions

Catalytic enhancement of chemical reactions via heterogeneous materials occurs through stabilization of transition states at designed active sites, but dramatically greater rate acceleration on that same active site is achieved when the surface intermediates oscillate in binding energy. The applied oscillation amplitude and frequency can accelerate reactions orders of magnitude above the catalytic rates of static systems, provided the active site dynamics are tuned to the natural frequencies of the surface chemistry. In this work, differences in the characteristics of parallel reactions are exploited via selective application of active site dynamics (0 < ΔU < 1.0 eV amplitude, 10<sup>-6</sup> < f < 10<sup>4</sup> Hz frequency) to control the extent of competing reactions occurring on the shared catalytic surface. Simulation of multiple parallel reaction systems with broad range of variation in chemical parameters revealed that parallel chemistries are highly tunable in selectivity between either pure product, even when specific products are not selectively produced under static conditions. Two mechanisms leading to dynamic selectivity control were identified: (i) surface thermodynamic control of one product species under strong binding conditions, or (ii) catalytic resonance of the kinetics of one reaction over the other. These dynamic parallel pathway control strategies applied to a host of chemical conditions indicate significant potential for improving the catalytic performance of many important industrial chemical reactions beyond their existing static performance.

Fabrication and Excellent Catalytic Performance of Three-dimensional Ordered Mesoporous Molybdenum Oxides

2014 ◽  
Vol 29 (2) ◽  
pp. 124-130 ◽  
Author(s):  
Yu-Cheng DU ◽  
Guang-Wei ZHENG ◽  
Qi MENG ◽  
Li-Ping WANG ◽  
Hai-Guang FAN ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Catalytic Performance ◽  
Molybdenum Oxides ◽  
Ordered Mesoporous ◽  
Excellent Catalytic Performance

Preparation of CeO2-ZrO2-Al2O3 and Catalytic Performance of Palladium-Based Three-Way Catalyst

2010 ◽  
Vol 31 (4) ◽  
pp. 429-434
Author(s):  
Ming ZHAO ◽  
Hairong WANG ◽  
Shanhu CHEN ◽  
Yanling YAO ◽  
Maochu GONG ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Three Way Catalyst
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