Kinetic enhancement of ammonia decomposition as a chemical hydrogen carrier in palladium membrane reactor

Itoh, Naotsugu; Oshima, Atsushi; Suga, Eita; Sato, Takafumi

doi:10.1016/j.cattod.2014.02.054

Cited by 69 publications

(48 citation statements)

References 13 publications

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“…NH 3 offers several advantages: high volumetric (108 kg H 2 per m 3 NH 3 at 20°C and 8.6 bar) and gravimetric energy density (17.8 wt%), ease of storage and transport, and the fact that NH 3 production is a very well established technology (global production of 176 million metric tons in 2014 (ref. [17][18][19][20][21]); these all point to ammonia as a very promising energy carrier readily compatible with the current distribution network. Moreover, ammonia decomposition is economically more viable than reforming processes, including methanol reforming, 22,23 and hydrogen and N 2 are the only decomposition products, in contrast to the coproduction of CO, CO 2 , and CH 4 from other liquid H 2 carriers.…”

Section: Introductionmentioning

confidence: 96%

High pressure ammonia decomposition on Ru–K/CaO catalysts

Sayas

Morlanés

Katikaneni

et al. 2020

Catal. Sci. Technol.

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Section: Introductionmentioning

confidence: 96%

High pressure ammonia decomposition on Ru–K/CaO catalysts

Sayas

Morlanés

Katikaneni

et al. 2020

Catal. Sci. Technol.

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“…erefore, a Langmuir-Hinshelwood type of rate equation described in Eq. (3) could be obtained by assuming the recombinative desorption of N atoms from the catalyst surface as the rate-determining step and N as the dominant adsorbed species (Froment and Bischof, 1990;Itoh et al, 2014) [MPa]. e actual reaction rate (r) was slightly increased with an increase in the ow rate ratios of N 2 /NH 3 because the denominator of the rate equation (Eq.…”

Section: Catalytic Performance Of the Cs-ru/ceo 2 Catalystmentioning

confidence: 99%

Effect of Alkali Metal Addition to a Ru/CeO2 Catalyst Prepared by NaBH4 Reduction on the Catalytic Performance for H2 Production via NH3 Decomposition

Furusawa

Sugiyama

Kuribara

et al. 2021

J. Chem. Eng. Japan / JCEJ

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The Ru/CeO 2 (JRC-CEO-3) catalyst prepared by NaBH 4 reduction showed a high activity for NH 3 decomposition compared with the other catalysts prepared in this work; however, this catalyst gradually lost its activity due to the accumulation of adsorbed species produced during the reaction. Cs signi cantly improved the catalytic performance of the Ru/CeO 2 catalyst, and the optimum Cs/Ru molar ratio was 0.4 because excess Cs species gradually covered the exposed Ru metal active sites. Cs-Ru/CeO 2 -0.4 catalyzed the NH 3 decomposition reaction without H 2 pretreatment because the catalyst was activated by NH 3 or H 2 produced by NH 3 decomposition. Moreover, Cs not only increased the N-H bond dissociation rate but also decreased the e ect of the H 2 partial pressure on the catalytic performance. Consequently, the Cs-Ru/CeO 2 -0.4 catalyst exhibited a high, stable activity (NH 3 conversion: 92% at 623 K and 60% at 573 K) with a gas hourly space velocity of 2000 mL-NH 3 g-cat 1 h 1 .

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“…Membrane reactors (MRs) have received significant attention for their potential use in decentralized hydrogen production systems, allowed by the integrated production and separation of hydrogen [ 1 , 2 , 3 ]. The reactions most commonly carried out are those of steam reforming of different carbon-based feeds such as methane [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], methanol [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ], ethanol [ 22 , 23 , 24 , 25 , 26 , 27 ], biogas [ 28 , 29 ], and glycerol [ 30 , 31 , 32 ]; water-gas shift [ 33 , 34 , 35 , 36 , 37 , 38 ]; ammonia decomposition [ 39 , 40 ]; and the dehydrogenation of alkanes [ 41 , 42 , 43 , 44 ]. In all cases the equilibrium of the reaction is shifted by removing hydrogen through a membrane.…”

Section: Introductionmentioning

confidence: 99%

Modeling Fixed Bed Membrane Reactors for Hydrogen Production through Steam Reforming Reactions: A Critical Analysis

2018

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Membrane reactors for hydrogen production have been extensively studied in the past years due to the interest in developing systems that are adequate for the decentralized production of high-purity hydrogen. Research in this field has been both experimental and theoretical. The aim of this work is two-fold. On the one hand, modeling work on membrane reactors that has been carried out in the past is presented and discussed, along with the constitutive equations used to describe the different phenomena characterizing the behavior of the system. On the other hand, an attempt is made to shed some light on the meaning and usefulness of models developed with different degrees of complexity. The motivation has been that, given the different ways and degrees in which transport models can be simplified, the process is not always straightforward and, in some cases, leads to conceptual inconsistencies that are not easily identifiable or identified.

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Kinetic enhancement of ammonia decomposition as a chemical hydrogen carrier in palladium membrane reactor

Cited by 69 publications

References 13 publications

High pressure ammonia decomposition on Ru–K/CaO catalysts

High pressure ammonia decomposition on Ru–K/CaO catalysts

Effect of Alkali Metal Addition to a Ru/CeO<sub>2</sub> Catalyst Prepared by NaBH<sub>4</sub> Reduction on the Catalytic Performance for H<sub>2</sub> Production via NH<sub>3</sub> Decomposition

Modeling Fixed Bed Membrane Reactors for Hydrogen Production through Steam Reforming Reactions: A Critical Analysis

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