Improved ammonia synthesis activity of Ce doped barium tantalate supported Ru catalysts

2021 ◽  
Author(s):  
Jia Huang ◽  
Yushi Zhao ◽  
Mingwei Yuan ◽  
Jinjun Li ◽  
Zhixiong You
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ammonia Synthesis ◽  
Ru Catalysts ◽  
Synthesis Activity

Ce doping could increase the specific surface area and reducibility of the barium tantalate carrier, which is beneficial to Ru based ammonia synthesis.

scholarly journals The effect of iron nanocrystallites’ size in catalysts for ammonia synthesis on nitriding reaction and catalytic ammonia decomposition

2011 ◽  
Vol 9 (2) ◽  
pp. 240-244 ◽  
Author(s):  
Rafał Pelka ◽  
Karolina Kiełbasa ◽  
Walerian Arabczyk
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Atmospheric Pressure ◽  
Active Sites ◽  
Ammonia Synthesis ◽  
Iron Catalyst ◽  
Ammonia Decomposition ◽  
Mean Size ◽  
Catalytic Ammonia Decomposition

AbstractIron catalyst for ammonia synthesis of various mean sizes of iron nanocrystallites were nitrided with ammonia in a differential reactor equipped with systems that made it possible to conduct both thermogravimetric measurements and hydrogen concentration analyses in the reacting gas mixture. The nitriding process was investigated under atmospheric pressure at the temperature of 475°C. It was found that along with an increase of mean size of iron nanocrystallites, with a decrease of specific surface area of the samples, nitriding degree of solid samples increased. At the same time the rate of surface reaction of catalytic ammonia decomposition decreased. Along with an increase of the samples’ specific surface area an increase of the catalyst’s activity was observed. However, it was also observed that the concentration of active sites on the catalysts’ surface decreased along with an increase of specific surface area.

The Study on Mechanism of Thermostability of Wustite-Based Ammonia Synthesis Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 266-269 ◽  
Author(s):  
Fan Xiao ◽  
Yi Fan Jin
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ammonia Synthesis ◽  
Excellent Activity ◽  
Multi Phase

Commercial catalysts were characterized by SEM and XRD. The dendrites of catalysts were clear. Some promoters were solid-solute in crystallites uniformly in the form of f-phase, which blocked the crystallites from growing to improve the activity and thermostability of the catalyst. The reduced catalyst is an (α+f) multi-phase porous alloy. The larger specific surface area and the more active poαsition resulted in excellent activity of catalysts.

scholarly journals Studies on the recrystalization of nanocrystalline metals

2007 ◽  
Vol 9 (4) ◽  
pp. 5-7 ◽  
Author(s):  
Zofia Lendzion-Bieluń ◽  
Marta Gleń
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ammonia Synthesis ◽  
Iron Catalyst ◽  
Annealing Process ◽  
Nanocrystalline Metals

Studies on the recrystalization of nanocrystalline metals The influence of the promoters such as CaO, Al2O3 and K2O on the specific surface area of the nanocrystalline cobalt was determined. The recrystalization process of the nanocrystalline cobalt was determined and compared with the examinations conducted on the iron catalyst for ammonia synthesis. The triply promoted nanocrystalline obtained cobalt after the annealing process, has got greater specific surface area than the triply promoted iron.

scholarly journals The effect of manganese on the structural and surface properties of nanocrystalline cobalt catalyst for ammonia synthesis

2012 ◽  
Vol 10 (2) ◽  
pp. 327-331 ◽  
Author(s):  
Zofia Lendzion-Bieluń
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Surface Properties ◽  
Specific Surface Area ◽  
Cobalt Catalyst ◽  
Ammonia Synthesis ◽  
Iron Catalyst ◽  
Active Surface ◽  
Surface Model ◽  
Icp Oes

AbstractBased on the active surface model of the iron catalyst for ammonia synthesis, the assumptions which led to obtaining the cobalt catalyst for ammonia synthesis were described. The incorporation into the system small amounts of manganese, an element which binds oxygen stronger than cobalt, has influence the development of the catalyst’s specific surface area. The activity of manganese modified catalysts is higher than that of cobalt catalyst without manganese addition. The obtained catalysts were characterized with the following methods: ICP-OES, XRD, BET

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