Preparation of High Activity Catalyst for Ammonia Synthesis by Supporting Well-Defined Ru Nanoparticles on γ-Al2O3

2001 ◽  
Vol 30 (12) ◽  
pp. 1332-1333 ◽  
Author(s):  
Akane Miyazaki ◽  
Ioan Balint ◽  
Ken-ichi Aika ◽  
Yoshio Nakano
Keyword(s):  
High Activity ◽  
Ammonia Synthesis ◽  
Ru Nanoparticles ◽  
Activity Catalyst

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>

Two-Dimensional Transition Metal Borides as High Activity and Selectivity Catalysts for Ammonia Synthesis

Nanoscale ◽  
2021 ◽  
Author(s):  
Haona Zhang ◽  
Shuhua Wang ◽  
Hao Wang ◽  
Baibiao Huang ◽  
Shuping Dong ◽  
...  
Keyword(s):  
Transition Metal ◽  
Specific Surface ◽  
High Activity ◽  
Surface Area ◽  
Active Site ◽  
Ammonia Synthesis ◽  
Two Dimensional ◽  
Large Specific Surface Area ◽  
Site Density ◽  
Metal Borides

In comparison to defect/doping induced activity in materials, transition metal borides with exposed metal atom, large specific surface area and high active site density show advantages as durable and efficient...

In situ preparation of Ca0.5Mn0.5O/C as a novel high-activity catalyst for the oxygen reduction reaction

2016 ◽  
Vol 4 (48) ◽  
pp. 19147-19153 ◽  
Author(s):  
Yu-Qi Lyu ◽  
Chi Chen ◽  
Yang Gao ◽  
Mattia Saccoccio ◽  
Francesco Ciucci
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Activity ◽  
Rock Salt ◽  
Reduction Reaction ◽  
In Situ Preparation ◽  
Enhanced Activity ◽  
Activity Catalyst

Ca-substituted rock-salt MnO/C (Ca0.5Mn0.5O/C) is prepared using an in situ approach and shows enhanced activity for the oxygen reduction reaction (ORR).

Novel preparation of nanocrystalline magnesia-supported caesium-promoted ruthenium catalyst with high activity for ammonia synthesis

2003 ◽  
pp. 2488-2489 ◽  
Author(s):  
Shan Wu ◽  
Jixin Chen ◽  
Xingfang Zheng ◽  
Haisheng Zeng ◽  
Chunming Zheng ◽  
...  
Keyword(s):  
High Activity ◽  
Ammonia Synthesis ◽  
Ruthenium Catalyst

Synthesis and investigation of a high-activity catalyst: Au nanoparticles modified metalic Ti microrods for NaBH4 electrooxidation

2018 ◽  
Vol 43 (7) ◽  
pp. 3688-3696 ◽  
Author(s):  
Congying Song ◽  
Biaopeng Li ◽  
Kui Cheng ◽  
Ke Ye ◽  
Kai Zhu ◽  
...  
Keyword(s):  
High Activity ◽  
Au Nanoparticles ◽  
Activity Catalyst

On the origin of high activity of hcp metals for ammonia synthesis

2016 ◽  
Vol 18 (7) ◽  
pp. 5291-5298 ◽  
Author(s):  
Shideh Ahmadi ◽  
Payam Kaghazchi
Keyword(s):  
High Activity ◽  
Ammonia Synthesis

We find that the high activity of nanoparticles of hcp metals (Ru, Os, and Re) for ammonia synthesis is due to the N-induced formation of atomically-rough {134̄2} facets.

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