Preparation of Ru/carbon - catalysts for ammonia synthesis

1998 ◽  
pp. 213-218 ◽  
Author(s):  
N.M. Dobrynkin ◽  
P.G. Tsyrulnikov ◽  
A.S. Noskov ◽  
N.B. Shitova ◽  
I.A. Polukhina ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Carbon Catalysts

Isotopic Transient Analysis of Ammonia Synthesis over Ba or Cs-Promoted Ru/Carbon Catalysts

2004 ◽  
Vol 93 (1/2) ◽  
pp. 61-65 ◽  
Author(s):  
Stacey E. Siporin ◽  
Robert J. Davis ◽  
Wioletta Raróg-Pilecka ◽  
Dariusz Szmigiel ◽  
Zbigniew Kowalczyk
Keyword(s):  
Transient Analysis ◽  
Ammonia Synthesis ◽  
Carbon Catalysts

Effect of potassium precursors on the thermal stability of K-promoted Ru/carbon catalysts for ammonia synthesis

2015 ◽  
Vol 5 (5) ◽  
pp. 2829-2838 ◽  
Author(s):  
Bingyu Lin ◽  
Yanchao Qi ◽  
Yunjie Guo ◽  
Jianxin Lin ◽  
Jun Ni
Keyword(s):  
Thermal Stability ◽  
Ammonia Synthesis ◽  
The Stability ◽  
Carbon Catalysts ◽  
Thermal Stability Of

The effect of K precursors on the stability of K-promoted Ru/carbon catalysts for ammonia synthesis was studied.

X-ray absorption spectroscopy of Ba- and Cs-promoted Ru/mesoporous carbon catalysts for long-term ammonia synthesis under intermittent operation conditions

2020 ◽  
Vol 4 (2) ◽  
pp. 832-842 ◽  
Author(s):  
Masayasu Nishi ◽  
Shih-Yuan Chen ◽  
Hideyuki Takagi
Keyword(s):  
Absorption Spectroscopy ◽  
Active Sites ◽  
Ammonia Synthesis ◽  
Mesoporous Carbons ◽  
X Ray ◽  
Operation Conditions ◽  
Intermittent Operation ◽  
Carbon Catalysts ◽  
X Ray Absorption

The active sites of Ba- and Cs-promoted Ru/mesoporous carbons were examined by advanced techniques, especially X-ray absorption spectroscopy, and correlated to their activities in long-term ammonia synthesis under intermittent operation conditions.

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>

Hydrogenation of nitrogen oxide on platinum-carbon catalysts in acidic medium

1981 ◽  
Vol 46 (11) ◽  
pp. 2669-2675 ◽  
Author(s):  
Ivo Paseka
Keyword(s):  
Nitrogen Oxide ◽  
Acidic Medium ◽  
Diffusion Region ◽  
Acid Solutions ◽  
Experimental Conditions ◽  
Platinum Content ◽  
Kinetically Controlled ◽  
Partial Pressures ◽  
Carbon Catalysts

Hydrogenation of nitrogen oxide in acid solutions on Pt-C catalysts proceeds in dependence on experimental conditions either in purely diffusion region or in the diffusion and kinetically controlled region. The boundary between these two processes shifts to the higher ratio of NO to H2 partial pressures with increasing platinum content and decreasing intensity of agitation.

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