Hydrogen from coal: Production and utilisation technologies

Shoko, Elvis; McLellan, Benjamin; Dicks, Andrew; Costa, João C. Diniz da

doi:10.1016/j.coal.2005.05.004

Cited by 151 publications

(63 citation statements)

References 9 publications

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“…However, the diffraction peak intensity of Al is negligible in the hydrolysis products of Al alloys9%CaO9%NaCl composites. The mainly hydrolysis products are composed of Al(OH) 3 and AlO(OH). The diffraction peaks of Al(OH) 3 are sharp, while the peaks of AlO(OH) are wide indicating its low crystalline.…”

Section: Characterizationmentioning

confidence: 99%

“…Using KCl obtained the higher hydrogen generation rates and hydrogen conversion efficiency in comparison with NaCl. Fan et al 22) discussed the reactivity of AlBi alloys in water by adding different salts including KCl, NaCl, LiCl, MgCl 2 , AlCl 3 2 27) were also investigated. Unlike Al alloys activated by low melting point metals, Al based composites prepared by addition of salts or oxides have the merits of low cost.…”

Section: Introductionmentioning

confidence: 99%

“…1) Currently, gas, 2) coal 3) and petroleum 4) are the main resources for the industrial hydrogen production. As these resources still belongs to the fossil fuel, the hydrogen production methods based on it could not offer the fundamental solution to the environmental crisis arising by fossil fuel burning.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Hydrolysis of Aluminum Based Composites for Hydrogen Production in Pure Water

Wang

Dong

et al. 2014

Mater. Trans.

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A series of Al based composites were prepared using mechanical milling method in this paper. Effects of additives including CaO, NaCl salt and low melting point metals (Ga, In, and Sn) on the hydrolysis activity of Al based composites were evaluated in pure water. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the microstructure analysis of as-prepared samples and their hydrolysis products. The results showed that the addition of CaO, NaCl salt and low melting point metals can effectively improve the hydrolysis properties of Al based composites. Especially, Al alloys-CaONaCl composites exhibited a higher hydrogen yields than AlCaO and AlCaO NaCl materials. The SEM images displayed that NaCl salt particles were homogeneously distributed on the surface of Al based composites and inserted into Al matrix, which may damage the surface oxide layer of Al. Furthermore, the size of NaCl salt particles was much smaller in Al alloys-CaONaCl composites than that in AlCaONaCl composites. The XRD patterns identified that the hydrolysis products were mainly composed of AlO(OH) and Al(OH) 3 . The microstructure-related hydrolysis reaction mechanism of Al based composites was proposed finally.

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Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and Hydrolysis of Aluminum Based Composites for Hydrogen Production in Pure Water

Wang

Dong

et al. 2014

Mater. Trans.

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“…[14] The other mechanism normally considered is the associative mechanism of the Langmuir-Hinshelwood (LH) type, which involves the dissociative adsorption of water to form reactive hydroxyl groups, that when combined with adsorbed CO produces a surface intermediate structure (formate and/or carbonate) which subsequently decomposes into CO 2 and H 2 [9] (cf. Eqns (11)(12)(13)(14)(15)(16)). Infrared spectroscopy has been used by many authors to validate this associative mechanism, namely, for observing the presence of characteristic bound vibrations of formate or carbonate-like species (reaction intermediates).…”

Section: Mechanisms and Kineticsmentioning

confidence: 99%

“…However, coal, the most abundant fossil fuel on the planet, is being looked as the possible future major source of H 2 , due to the development of the integrated gasification combined cycle (IGCC) and the integrated gasification fuel cell (IGFC) technologies. [13] Taking into account the exothermic nature of the WGS reaction, higher CO conversions are favored at lower temperatures. But kinetics are almost instantaneous at very high temperatures.…”

Section: Description Of the Wgs Reaction In Traditional Reactorsmentioning

confidence: 99%

The water‐gas shift reaction: from conventional catalytic systems to Pd‐based membrane reactors—a review

Mendes

Madeira

et al. 2009

Asia-Pacific J Chem Eng

205

109

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The water-gas shift (WGS) reaction is a well-known step for upgrading carbon monoxide to hydrogen in the production of synthesis gas. For more than 90 years after its first industrial application, many issues in respect of the catalyst, process configuration, reactor design, reaction mechanisms and kinetics have been investigated. More recently, a renewed interest in the WGS reaction carried out in hydrogen perm-selective membrane reactors (MRs) has been observed because of the growing use of polymeric electrolyte membrane (PEM) fuel cells that operate using high-purity hydrogen. Moreover, MRs are viewed as an interesting technology in order to overcome the equilibrium conversion limitations in traditional reactors.This article reviews the most relevant topics of WGS MR technology -catalysis and membrane science. The most used catalysts and relevant progress achieved so far are described and critically reviewed. The effects of the most important parameters affecting the WGS in MRs are detailed. In addition, an overview on the most used membranes in MRs is also presented and discussed. 

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Geothermal Energy‐Driven Hydrogen Production Systems

Ghosh¹,

Varma²

2023

Materials for Hydrogen Production, Conversion, and Storage

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Hydrogen from coal: Production and utilisation technologies

Cited by 151 publications

References 9 publications

Preparation and Hydrolysis of Aluminum Based Composites for Hydrogen Production in Pure Water

Preparation and Hydrolysis of Aluminum Based Composites for Hydrogen Production in Pure Water

The water‐gas shift reaction: from conventional catalytic systems to Pd‐based membrane reactors—a review

Geothermal Energy‐Driven Hydrogen Production Systems

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