Process Optimisation of In Situ H2 Generation From Ammonia Using Ni on Alumina Coated Cordierite Monoliths

Plana, Carlos; Armenise, Sabino; Μοnzόn, A.; García‐Bordejé, Enrique

doi:10.1007/s11244-011-9706-x

Cited by 13 publications

(12 citation statements)

References 37 publications

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“…They also tested the catalytic honeycomb after crushing it, and they observed a higher activity for the structured reactor, probably due to a more uniform reagent flow distribution. 479 In a similar manner, Armenise et al 385 coated a cordierite honeycomb with Al 2 O 3 and subsequently Ru. A comparison of the conversion of ammonia with that obtained in the work described previously 471 with the monolith prepared using the same method but with Ni showed that a higher conversion was obtained with Ru with respect to Ni.…”

Section: Ahmentioning

confidence: 98%

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

306

193

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Because of the problems associated with the generation and storage of hydrogen in portable applications, the use of ammonia has been proposed for on-site production of hydrogen through ammonia decomposition. First, an analysis of the existing systems for ammonia decomposition and the challenges for this technology are presented. Then, the state of the art of the catalysts used to date for ammonia decomposition is described considering the catalysts composed of noble and non-noble metals and their combinations, as well as novel materials such as alkali metal amides and imides. The effect of the supports and promoters used is analyzed in detail, and the catalytic activity obtained is compared. An analysis of the kinetics of the reaction obtained with different catalysts is also presented and discussed, including the reaction mechanism, the determining step of the reaction, and the apparent activation energy. Finally, the structured reactors used to date for the decomposition reaction of ammonia are explored, as well as the possibilities offered by catalytic membrane reactors, which allow the on-site simultaneous production and separation of hydrogen.

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Section: Ahmentioning

confidence: 98%

Review of the Decomposition of Ammonia to Generate Hydrogen

Lucentini

Garcia

Vendrell

et al. 2021

Ind. Eng. Chem. Res.

306

193

View full text Add to dashboard Cite

show abstract

“…Interestingly, complete ammonia decomposition conversion was achieved with an Al 2 O 3 coated monolithic nickel catalyst at temperatures 100°C lower compared to a packed bed of the same Ni/Al 2 O 3 catalyst [73]. This is likely due to the increase in exposed nickel, although this catalyst does not outperform other Ni/Al 2 O 3 presented in Table 3 Nickel nanoparticles were found to be anchored to the alumina surface as opposed to blocking the mesopores of the monolith.…”

mentioning

confidence: 96%

“…This is likely due to the increase in exposed nickel, although this catalyst does not outperform other Ni/Al 2 O 3 presented in Table 3 Nickel nanoparticles were found to be anchored to the alumina surface as opposed to blocking the mesopores of the monolith. Thus, catalysts supported on monoliths are promising in the development of cheap, efficient and robust catalysts with a lower pressure drop, making them suitable for potential mobile applications [73].…”

mentioning

confidence: 99%

H2 Production via Ammonia Decomposition Using Non-Noble Metal Catalysts: A Review

2016

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The wide-spread implementation of the so-called hydrogen economy is currently partially limited by an economically feasible way of storing hydrogen. In this context, ammonia has been commonly presented as a viable option for chemical storage due its high hydrogen content (17.6 wt%). However, its use as an energy carrier requires the development of catalytic systems capable of releasing hydrogen at adequate rates and conditions. At the moment, the most active catalytic systems for the decomposition of ammonia are based on ruthenium, however its cost and scarcity inhibit the wide scale use of these catalysts. This issue has triggered research on the development of alternative catalysts based on more sustainable systems using more readily available, non-noble metals mainly iron, cobalt and nickel as well as a series of transition metal carbides and nitrides and bimetallic systems, which are reviewed herein. There have been some promising cobaltand nickel-based catalysts reported for the decomposition of ammonia but metal dispersion needs to be increased in order to become more attractive candidates. Conversely, there seems to be less scope for improvement of iron-based catalysts and metal carbides and nitrides. The area with the most potential for improvement is with bimetallic catalysts, particularly those consisting of cobalt and molybdenum.

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“…For experimental comparison, ceramic honeycombs (Synthetic cordierite, 2MgO·2Al 2 O 3 ·5SiO 2 ) from Applied Ceramics of 230 and 400 CPSI were used for the catalyst preparation. The support particles were loaded onto the ceramic substrate by sol‐gel technique . In this case 1:2:5 (wt) of urea, 0.3 M HNO 3 , and boehmite (CATAPAL B of packing density 800–1100 kg/m 3 , from Sasol) were used.…”

Section: Methodsmentioning

confidence: 99%

“…The support particles were loaded onto the ceramic substrate by sol-gel technique. [24][25][26][27] In this case 1:2:5 (wt) of urea, 0.3 M HNO 3 , and boehmite (CATAPAL B of packing density 800-1100 kg/m 3 , from Sasol) were used. The substrate was immersed into the solution for 5 min followed by the removal of the excess solution by flowing air through the substrate.…”

Section: Reaction Kinetic Modeling For Pleated Mfecmentioning

confidence: 99%

Comparison of wash‐coated monoliths vs. microfibrous entrapped catalyst structures for catalytic VOC removal

2014

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Head-to-head experimental performance comparisons for flow through pleated microfibrous structures (flat-, V-, and Wshaped) were made with wash-coated monolith of different cells per square inch (230 and 400). Microfibrous entrapped catalyst (MFEC) was prepared by entrapping support particles (c-Al 2 O 3 , 150-250 lm diameter) into nickel microfibers. Pleated structures of MFECs and wash-coated monoliths containing Pd-Mn/c-Al 2 O 3 were investigated systematically for volatile organic compound (e.g., ethanol) removal at various face velocities (ca. 3-30 m/s) and at low temperatures ( 473 K). The experimental studies showed that pleated MFEC (W-shaped) had shown significantly improved performance in VOC removal in terms of conversion and pressure drop than tested monolith for high face velocity system. The flexibility of pleating lowered the effective velocity inside the media that resulted lower pressure drop and higher conversion. Furthermore, a reaction kinetic model was developed for pleated MFEC considering the Peffer's model to substantiate the experimental results.

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Process Optimisation of In Situ H2 Generation From Ammonia Using Ni on Alumina Coated Cordierite Monoliths

Cited by 13 publications

References 37 publications

Review of the Decomposition of Ammonia to Generate Hydrogen

Review of the Decomposition of Ammonia to Generate Hydrogen

H2 Production via Ammonia Decomposition Using Non-Noble Metal Catalysts: A Review

Comparison of wash‐coated monoliths vs. microfibrous entrapped catalyst structures for catalytic VOC removal

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