Ammonia decomposition over commercial Ru/Al2O3 catalyst: An experimental evaluation at different operative pressures and temperatures

Carlo, Andrea Di; Vecchione, Luigi; Prete, Zaccaria Del

doi:10.1016/j.ijhydene.2013.10.110

Cited by 85 publications

(51 citation statements)

References 17 publications

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“…Ru catalysts are the most active among them, much effort has been devoted for the catalyst development [8][9][10][11][12][13][14][15][16][17]. In previous reports, Ru catalysts supported on carbon nanotube (CNT) showed very high activity for ammonia decomposition because the high surface area of CNT enabled high dispersion of Ru species [2,8,9].…”

Section: Introductionmentioning

confidence: 99%

Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst

Okura

Okanishi

Muroyama

et al. 2015

Applied Catalysis A: General

119

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Please cite this article as: Kaname Okura, Takeou Okanishi, Hiroki Muroyama, Toshiaki Matsui, Koichi Eguchi, Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst, Applied Catalysis A, General http://dx. Graphical abstract Graphical abstract Graphical abstract Graphical abstractHighlights Highlights Highlights Highlights • The Ni/Al2O3 catalysts modified by rare-earth elements were investigated.• The addition of rare-earth elements promoted ammonia decomposition reaction.• La-modified Ni/Al2O3 was most active in this study.• The hydrogen inhibition phenomenon was alleviated by the modification. AbstractAmmonia decomposition has attracted much attention as an efficient method for the on-site generation of hydrogen. In this study, alumina-supported nickel catalysts (Ni/Al2O3) modified by rare-earth elements were prepared by the impregnation method and their catalytic activity for the ammonia decomposition was investigated. The addition of rare-earth elements promoted the decomposition reaction over catalysts and the La-modified catalyst achieved the highest ammonia conversion in this work. For the modified catalysts, the adsorbed hydrogen, which is known to be an inhibitive species for the ammonia decomposition, desorbed at lower temperature compared to the unmodified one. Therefore, the effective alleviation of hydrogen inhibition would be responsible for the activity enhancement for the modified catalysts. The reaction kinetics study also supported this proposed mechanism. For the La-modified catalyst, the optimal pretreatment condition was investigated to enhance the catalytic activity.The catalyst calcined at 400ºC followed by reduction at 600ºC exhibited the highest ammonia conversion of 94% at 550ºC.

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Section: Introductionmentioning

confidence: 99%

Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst

Okura

Okanishi

Muroyama

et al. 2015

Applied Catalysis A: General

119

View full text Add to dashboard Cite

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“…4a. A feed temperature range (600°C-900°C) is considered (Chiuta et al, 2013;Di Carlo et al, 2014). As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…(Metkemeijer and Achard, 1994;Di Carlo et al, 2011). However, reforming of methanol suffers from the problem of carbon oxides (Di Carlo et al, 2014). On the other hand, ammonia is a carbon free compound and in a single step the thermal cracking only gives hydrogen and nitrogen.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, ammonia is a carbon free compound and in a single step the thermal cracking only gives hydrogen and nitrogen. Moreover, ammonia decomposition process is an economical hydrogen process more than the methanol process (Garcia et al, 2008;Di Carlo et al, 2014) property of ammonia is lower production cost (1 $/kg) compared with hydrogen (3.5-5.5 $/kg) (Di Carlo et al, 2011). These characteristics grant privilege to ammonia.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-clean hydrogen production by ammonia decomposition

Abashar

2018

Journal of King Saud University - Engineering Sciences

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A rigorous heterogeneous mathematical model is used to simulate a cascade of multistage fixed bed membrane reactors (MSFBMR) with inter-stage heating and fresh sweep gas for the decomposition of ammonia to produce high purity hydrogen suitable for the PEM fuel cells. Different reactor configurations are compared. The comparison between a single fixed bed reactor (FBR) and a single fixed bed membrane reactor (FBMR) shows that the FBMR is superior to the FBR and gives 60.48% ammonia conversion higher than the FBR. However, 20.91% exit ammonia conversion obtained by the FBMR is considered to be poor. The FBMR is limited by the kinetics at low temperatures. The numerical results show that the MSFBMR of four beds achieve 100.0% ammonia conversion. It was found that the membrane plays the prime role in the displacement of the thermodynamic equilibrium. The results also show that, a linear relationship exists between the number of beds and the feed temperature and a correlation has been developed. A critical point for an effective hydrogen permeation zone has been identified. It is observed that the diffusion limitation is confined to a slim region at the entrance of the reactor. It is also observed that the heat load assumes a maximum inflection point and explanations offered. The results show that the multistage configuration has a promising potential to be applied successfully on-site for ultra-clean hydrogen production.

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“…A commercial Cesium-promoted 8.5 wt% Ru/Al 2 O 3 (Hypermec 10010 [11,18]; BET surface area of 113 m 2 g À1 and pore volume of 0.30 cm 3 g À1 ) catalyst supplied by ACTA S.p.A (Crespina, Italy) was used. The catalyst was deposited onto the microchannels using a sequential washcoating, drying and calcination procedure described elsewhere [12].…”

Section: Catalyst Preparationmentioning

confidence: 99%

Performance evaluation of a high-throughput microchannel reactor for ammonia decomposition over a commercial Ru-based catalyst

Chiuta

Everson

Neomagus

et al. 2015

International Journal of Hydrogen Energy

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Ammonia decomposition over commercial Ru/Al2O3 catalyst: An experimental evaluation at different operative pressures and temperatures

Cited by 85 publications

References 17 publications

Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst

Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst

Ultra-clean hydrogen production by ammonia decomposition

Performance evaluation of a high-throughput microchannel reactor for ammonia decomposition over a commercial Ru-based catalyst

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