scholarly journals Comment on Weber et al. Mayenite-Based Electride C12A7e−: A Reactivity and Stability Study. Catalysts 2021, 11, 334

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1154
Author(s):  
Yasunori Inoue ◽  
Masaaki Kitano ◽  
Hideo Hosono
Keyword(s):  
Catalytic Activity ◽  
Work Function ◽  
Ammonia Synthesis ◽  
Stability Study ◽  
Ru Nanoparticles ◽  
Electron Donation

In 2012, we reported that C12A7 electride (C12A7: e−) significantly promotes the catalytic activity of Ru nanoparticles for ammonia synthesis through the electron donation from the C12A7: e− with a low work function (2.4 eV) to Ru [...]

Ru nanoparticles on Cs-loaded MgO superbase as highly efficient catalyst for ammonia synthesis

2021 ◽  
Author(s):  
Lin Liu ◽  
Xilun Zhang ◽  
Xiaohua Ju ◽  
Ji Feng ◽  
Jiemin Wang ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Ru Nanoparticles ◽  
Typical Type ◽  
Solid Superbase ◽  
Electron Donation

Cs-loaded MgO, a typical type of solid superbase, was used as support to disperse and anchor Ru nanoparticles. Much enhanced Ru dispersion together with electron donation of Cs-loaded MgO render...

Preparation of Ru Nanoparticles Supported on γ-Al2O3 and Its Novel Catalytic Activity for Ammonia Synthesis

2001 ◽  
Vol 204 (2) ◽  
pp. 364-371 ◽  
Author(s):  
Akane Miyazaki ◽  
Ioan Balint ◽  
Ken-ichi Aika ◽  
Yoshio Nakano
Keyword(s):  
Catalytic Activity ◽  
Ammonia Synthesis ◽  
Ru Nanoparticles

Disclosing the synergistic mechanism in the catalytic activity of different-sized Ru nanoparticles for ammonia synthesis at mild reaction conditions

2015 ◽  
Vol 251 ◽  
pp. 88-95 ◽  
Author(s):  
Camila Fernández ◽  
Chiara Pezzotta ◽  
Eric M. Gaigneaux ◽  
Nicolas Bion ◽  
Daniel Duprez ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ammonia Synthesis ◽  
Reaction Conditions ◽  
Ru Nanoparticles ◽  
Synergistic Mechanism

Electronic metal–support interactions enhance the ammonia synthesis activity over ruthenium supported on Zr-modified CeO2 catalysts

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 51106-51110 ◽  
Author(s):  
Zhanwei Ma ◽  
Xumao Xiong ◽  
Chengli Song ◽  
Bin Hu ◽  
Weiqiang Zhang
Keyword(s):  
Catalytic Activity ◽  
Electronic Properties ◽  
Ammonia Synthesis ◽  
Band Center ◽  
Support Interaction ◽  
Ru Nanoparticles ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Synthesis Activity ◽  
Metal Support Interactions

Doping Zr4+ alters the electronic properties of the support. The electronic metal–support interaction produces the upshift of d-band center of Ru nanoparticles, which further influences the catalytic activity of ammonia synthesis.

Electron Donation by Low-Crystalline Ba-La-Ce Oxygen-Deficient Composite Oxide Accumulating on Ru Nanoparticles for Ammonia Synthesis under Mild Conditions

2019 ◽  
Author(s):  
Katsutoshi Sato ◽  
Shin-ichiro Miyahara ◽  
Yuta Ogura ◽  
Kotoko Tsujimaru ◽  
Yuichiro Wada ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Bond Cleavage ◽  
Synthesis Process ◽  
Strong Electron ◽  
Mild Conditions ◽  
Ru Nanoparticles ◽  
Rate Determining Step ◽  
Highly Active ◽  
Composite Oxides ◽  
Low Crystalline

<p>To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity of Ru/Ba/LaCeO<i><sub>x</sub></i> pre-reduced at 700 °C is the highest reported among oxide-supported Ru catalysts. Our results indicate that low crystalline oxygen-deficient composite oxides, which include Ba<sup>2+</sup>, Ce<sup>3+</sup> and La<sup>3+</sup>, with strong electron-donating ability, accumulate on Ru particles and thus promote N≡N bond cleavage, which is the rate determining step for ammonia synthesis.</p>

Electron Donation by Low-Crystalline Ba-La-Ce Oxygen-Deficient Composite Oxide Accumulating on Ru Nanoparticles for Ammonia Synthesis under Mild Conditions

2019 ◽  
Author(s):  
Katsutoshi Sato ◽  
Shin-ichiro Miyahara ◽  
Yuta Ogura ◽  
Kotoko Tsujimaru ◽  
Yuichiro Wada ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Bond Cleavage ◽  
Synthesis Process ◽  
Strong Electron ◽  
Mild Conditions ◽  
Ru Nanoparticles ◽  
Rate Determining Step ◽  
Highly Active ◽  
Composite Oxides ◽  
Low Crystalline

<p>To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity of Ru/Ba/LaCeO<i><sub>x</sub></i> pre-reduced at 700 °C is the highest reported among oxide-supported Ru catalysts. Our results indicate that low crystalline oxygen-deficient composite oxides, which include Ba<sup>2+</sup>, Ce<sup>3+</sup> and La<sup>3+</sup>, with strong electron-donating ability, accumulate on Ru particles and thus promote N≡N bond cleavage, which is the rate determining step for ammonia synthesis.</p>

Ru/TiO2 Nanostructured Catalysts: Synthesis, Characterization and Catalytic Activity Towards Hydrogenation of Ethyl Levulinate

2021 ◽  
Vol 21 (12) ◽  
pp. 6160-6167
Author(s):  
Sakthivel Kumaravel ◽  
Sivakumar Thiripuranthagan ◽  
Elangovan Erusappan ◽  
Aishwarya Sivakumar ◽  
Saranraj Kumaravel ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Inductively Coupled Plasma ◽  
Sol Gel ◽  
Nanostructured Catalysts ◽  
Optical Emission ◽  
Morphological Properties ◽  
Emission Spectrometry ◽  
Experimental Conditions ◽  
Ethyl Levulinate ◽  
Ru Nanoparticles

Pristine TiO2 and x% Ru/TiO2 catalysts with different wt.% of Ru (x%= 1.5%, 2%, 2.5% and 3%) were synthesized using sol–gel and simple impregnation methods. Different characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), High-resolution transmission electron microscope (HR-TEM), Inductively coupled plasma-optical emission spectrometry (ICP-OES) and Thermogravimetry/Differential thermal analysis (TG/DTA) were used to study the physicochemical and morphological properties. The XRD patterns of the as-prepared pristine TiO2 catalyst showed high crystalline nature. The HR-TEM images revealed that the Ru nanoparticles (NPs) were evenly dispersed on the TiO2 surface. The prepared catalysts were evaluated for their catalytic activity towards the liquid phase hydrogenation of ethyl levulinate under mild reaction conditions (ambient H2 pressure). Among the various catalysts, 2.5% Ru/TiO2 catalyst showed the maximum catalytic activity of 79% ethyl levulinate (EL) conversion with 82% selectivity of γ-valerolactone (GVL). The recyclability test revealed that the most active 2.5% Ru/TiO2 also showed the highest stability of the catalyst under optimized experimental conditions.

scholarly journals Single-atom nickel confined nanotube superstructure as support for catalytic wet air oxidation of acetic acid

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Chengyu Jin ◽  
Lei Ma ◽  
Wenjing Sun ◽  
Peiwei Han ◽  
Xiangdong Tan ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Catalytic Activity ◽  
Noble Metal ◽  
Intrinsic Property ◽  
Single Atom ◽  
General Strategy ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Ru Nanoparticles

AbstractSingle-atom confined materials (SACMs) have been widely researched as catalysts in many fields within recent years. However, this class of materials may not only serve as a catalyst but also as a support material for certain reactions. Here we propose a general strategy to use SACMs as supports for tuning loaded noble metal (e.g., Ru) nanoparticles with enhanced catalytic activity. As a proof of concept, a nickel single-atom confined nitrogen-doped carbon nanotube (NCNT) superstructure is prepared as a support to load noble metal Ru for catalytic wet air oxidation of acetic acid. Improved catalytic activity with a mineralization rate of ~97.5% is achieved. Further, adsorption configurations based on DFT calculations also confirm our deduction that the introduction of single-atom Ni changes the intrinsic property of NCNTs and affects the loaded active Ru nanoparticles.

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