Effect of acidity and ruthenium species on catalytic performance of ruthenium catalysts for acetylene hydrochlorination

2018 ◽  
Vol 8 (23) ◽  
pp. 6143-6149 ◽  
Author(s):  
Xiaolong Wang ◽  
Guojun Lan ◽  
Huazhang Liu ◽  
Yihan Zhu ◽  
Ying Li
Keyword(s):  
High Activity ◽  
Catalytic Performance ◽  
Ruthenium Catalysts ◽  
Acetylene Hydrochlorination ◽  
Deactivation Mechanism

Carbon-supported ruthenium catalysts are promising mercury-free catalysts for acetylene hydrochlorination, due to their high activity and relatively low price. The deactivation mechanism was identified and solved by a simple ammonia treated method.

scholarly journals Low Apparent Activation Energy of Ammonia Synthesis over Ru Catalyst Supported by Hydrogen Storage Material

2021 ◽  
Author(s):  
kazuma torii ◽  
Takaya Ogawa ◽  
Ryusei Morimoto ◽  
Tetsu Seno ◽  
Hideyuki Okumura ◽  
...  
Keyword(s):  
Activation Energy ◽  
Hydrogen Storage ◽  
Apparent Activation Energy ◽  
High Activity ◽  
Ammonia Synthesis ◽  
Catalytic Performance ◽  
Ruthenium Catalysts ◽  
High Electron ◽  
Hydrogen Storage Material ◽  
Storage Material

<p>Ruthenium is an excellent catalyst for ammonia synthesis and recently shows quite high activity when supported on materials with high electron-donating and hydrogen-absorbing properties. The high activity is generally considered to originate from the two effects: the electron-donating property of the support, which reduces its apparent activation energy (<sup>app</sup>E<sub>a</sub>) to half of pure Ru’s <sup>app</sup>E<sub>a</sub>, and the hydrogen-absorbing property, which increases the active site by suppressing hydrogen poisoning, a drawback of ruthenium catalysts. Here, we investigated the catalytic performance of ruthenium loaded on TiMn<sub>2</sub>, a hydrogen storage material without electron-donating property to ruthenium. Ruthenium on TiMn<sub>2</sub> showed the <sup>app</sup>E<sub>a</sub> reduced by half despite the lack of electron-donating property. It is plausible that the decreased <sup>app</sup>E<sub>a</sub> is due to the elimination of hydrogen over Ru by TiMn<sub>2</sub>. The hydrogen storage capacity is also an essential factor in discussing the <sup>app</sup>E<sub>a</sub>.</p>

scholarly journals Low Apparent Activation Energy of Ammonia Synthesis over Ru Catalyst Supported by Hydrogen Storage Material

2021 ◽  
Author(s):  
kazuma torii ◽  
Takaya Ogawa ◽  
Ryusei Morimoto ◽  
Tetsu Seno ◽  
Hideyuki Okumura ◽  
...  
Keyword(s):  
Activation Energy ◽  
Hydrogen Storage ◽  
Apparent Activation Energy ◽  
High Activity ◽  
Ammonia Synthesis ◽  
Catalytic Performance ◽  
Ruthenium Catalysts ◽  
High Electron ◽  
Hydrogen Storage Material ◽  
Storage Material

<p>Ruthenium is an excellent catalyst for ammonia synthesis and recently shows quite high activity when supported on materials with high electron-donating and hydrogen-absorbing properties. The high activity is generally considered to originate from the two effects: the electron-donating property of the support, which reduces its apparent activation energy (<sup>app</sup>E<sub>a</sub>) to half of pure Ru’s <sup>app</sup>E<sub>a</sub>, and the hydrogen-absorbing property, which increases the active site by suppressing hydrogen poisoning, a drawback of ruthenium catalysts. Here, we investigated the catalytic performance of ruthenium loaded on TiMn<sub>2</sub>, a hydrogen storage material without electron-donating property to ruthenium. Ruthenium on TiMn<sub>2</sub> showed the <sup>app</sup>E<sub>a</sub> reduced by half despite the lack of electron-donating property. It is plausible that the decreased <sup>app</sup>E<sub>a</sub> is due to the elimination of hydrogen over Ru by TiMn<sub>2</sub>. The hydrogen storage capacity is also an essential factor in discussing the <sup>app</sup>E<sub>a</sub>.</p>

Unlocking the potential of ruthenium catalysts for nitrogen fixation with subsurface oxygen

2021 ◽  
Author(s):  
Xin Mao ◽  
Zhengxiang Gu ◽  
Cheng Yan ◽  
Aijun Du
Keyword(s):  
Nitrogen Fixation ◽  
High Activity ◽  
Ruthenium Catalysts ◽  
Ru Catalysts ◽  
Subsurface Oxygen

Decorating subsurface oxygen in Ru catalysts to achieve high activity and selectivity for N2 reduction to ammonia.

Fabrication of Hollow Silica-Alumina Composite Spheres Using L(+)-Arginine and their Catalytic Performance for Hydrolytic Dehydrogenation of Ammonia Borane

2014 ◽  
Vol 617 ◽  
pp. 170-173
Author(s):  
Tetsuo Umegaki ◽  
Shunsuke Imamura ◽  
Naoki Toyama ◽  
Qiang Xu ◽  
Yoshiyuki Kojima
Keyword(s):  
High Activity ◽  
Sol Gel ◽  
Hollow Spheres ◽  
Hollow Structure ◽  
Ammonia Borane ◽  
Catalytic Performance ◽  
Hollow Silica ◽  
Silica Alumina ◽  
Alumina Composite ◽  
Composite Walls

The present study reports a facile and effective approach for fabrication of hollow silica-alumina composite spheres. In this approach, silica-alumina composite walls were coated on polystyrene template by the sol-gel method using L(+)-arginine as a promoter for the reaction followed by calcination procedure. Using L(+)-arginine as a promoter of coating process, homogeneous hollow silica-alumina composite spheres are obtained and the wall thickness is larger than that of the hollow spheres prepared with ammonia. The hollow spheres shows high activity for hydrolytic dehydrogenation of ammonia borane compared with spherical silica-alumina composite particles without hollow structure, the hollow spheres prepared with ammonia, and conventional H-BEA zeolite. The results indicate that hollow structure plays important role to show high activity.

scholarly journals Adsorption Behavior and Electron Structure Engineering of Pd-Based Catalysts for Acetylene Hydrochlorination

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 24 ◽  
Author(s):  
Yaqing Cen ◽  
Yuxue Yue ◽  
Saisai Wang ◽  
Jinyue Lu ◽  
Bolin Wang ◽  
...  
Keyword(s):  
Palladium Catalysts ◽  
Influence Factor ◽  
Catalytic Performance ◽  
Electron Structure ◽  
Acetylene Hydrochlorination ◽  
Practical Applications ◽  
Highly Active ◽  
New Strategy ◽  
Function Relationship ◽  
The Stability

Adsorption and activation for substrates and the stability of Pd species in Pd-based catalysts are imperative for their wider adoption in industrial and practical applications. However, the influence factor of these aspects has remained unclear. This indicates a need to understand the various perceptions of the structure–function relationship that exists between microstructure and catalytic performance. Herein, we revisit the catalytic performance of supported-ionic-liquid-phase stabilized Pd-based catalysts with nitrogen-containing ligands as a promoter for acetylene hydrochlorination, and try to figure out their regulation. We found that the absolute value of the differential energy, |Eads(C2H2)-Eads(HCl)|, is negative correlated with the stability of palladium catalysts. These findings imply that the optimization of the electron structure provides a new strategy for designing highly active yet durable Pd-based catalysts.

Ruthenium catalysts for water oxidation involving tetradentate polypyridine-type ligands

2015 ◽  
Vol 185 ◽  
pp. 87-104 ◽  
Author(s):  
Lianpeng Tong ◽  
Ruifa Zong ◽  
Rongwei Zhou ◽  
Nattawut Kaveevivitchai ◽  
Gang Zhang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Catalytic Performance ◽  
Ruthenium Catalysts ◽  
Oxidation States ◽  
Coordination Geometry ◽  
Tetradentate Ligand ◽  
Catalytic Behavior ◽  
Axial Ligands ◽  
Substituted Pyridines ◽  
Equatorial Ligand

A series of RuII complexes that behave as water oxidation catalysts were prepared involving a tetradentate equatorial ligand and two 4-substituted pyridines as the axial ligands. Two of these complexes were derived from 2,9-di-(pyrid-2′-yl)-1,10-phenanthroline (dpp) and examine the effect of incorporating electron-donating amino and bulky t-butyl groups on catalytic activity. A third complex replaced the two distal pyridines with N-methylimidazoles that are more electron-donating than the pyridines of dpp and potentially stabilize higher oxidation states of the metal. The tetradentate ligand 2-(pyrid-2′-yl)-6-(1′′,10′′-phenanthrol-2′′-yl)pyridine (bpy–phen), possessing a bonding cavity similar to dpp, was also prepared. The RuII complex of this ligand does not have two rotatable pyridines in the equatorial plane and thus shows different flexibility from the [Ru(dpp)] complexes. All the complexes showed activity towards water oxidation. Investigation of their catalytic behavior and electrochemical properties suggests that they may follow the same catalytic pathway as the prototype [Ru(dpp)pic2]2+ involving a seven-coordinated [RuIV(O)] intermediate. The influence of coordination geometry on catalytic performance is analyzed and discussed.

Carbon-supported ruthenium catalysts prepared by a coordination strategy for acetylene hydrochlorination

2020 ◽  
Vol 41 (11) ◽  
pp. 1683-1691
Author(s):  
Xiaolong Wang ◽  
Guojun Lan ◽  
Zaizhe Cheng ◽  
Wenfeng Han ◽  
Haodong Tang ◽  
...  
Keyword(s):  
Ruthenium Catalysts ◽  
Acetylene Hydrochlorination ◽  
Coordination Strategy

The Effect of CO Pretreatment on Fe/ADM Catalyst for Higher Alcohols Synthesis from Syngas

2011 ◽  
Vol 347-353 ◽  
pp. 3772-3776
Author(s):  
Hai Cheng Xiao ◽  
Fan Hua Kong ◽  
Gui Zhi Wang ◽  
Si Han Wang ◽  
Gang Wang ◽  
...  
Keyword(s):  
High Activity ◽  
Synthesis Gas ◽  
Iron Carbide ◽  
Catalytic Performance ◽  
Higher Alcohols ◽  
Xps Spectra ◽  
Higher Alcohols Synthesis ◽  
Hydrocarbons Synthesis

The catalyst of FeS modified K2CO3/MoS2 (ADM) (Fe/ADM) were prepared and tested for higher alcohols (C2+OH) synthesis (HAS) from synthesis gas(syngas, mixture of H2 and CO). The effects of CO pretreatment on Fe/ADM catalyst and the catalytic performance for HAS were investigated. The ability for C2+OH formation was enhanced and the hydrocarbon selectivity was lowered after CO pretreatment. The XPS spectra revealed that the iron carbide species appeared and the potassium enriched on the surface of CO pretreated Fe/ADM catalyst, which might be responsible for the high activity of higher alcohols and low hydrocarbons synthesis, respectively.

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