Hydrogen mitigation
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2024
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EUROPEAN CONFERENCE AND EXHIBITION IN GRAPHENE AND 2D MATERIALS
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In the context of discussions surrounding the hydrogen economy, particularly its green aspects,
ensuring safety in the production and storage of hydrogen is paramount. This is especially
crucial when hydrogen mixes with air, comprising between 6% and 30% in volume, as it poses
potential risks of explosions. A proven method to mitigate these dangers is the utilization of
Passive Autocatalytic Recombiners (PARs). These devices facilitate the recombination of
hydrogen with oxygen on active catalytic surfaces, leading to the generation of water vapour
and heat [1], reducing significantly the risk of explosions. PARs are typically composed of
materials like stainless steel, alumina, and silica, which support active catalytic elements such
as platinum or palladium. To combat catalyst deactivation resulting from water accumulation,
researchers have explored the use of hydrophobic materials [2], among which graphene
stands out. Recent studies have demonstrated that graphene could be successfully applied
directly on surface, [3], using a non-thermal plasma system. This method resulted in the
production of a material with few layers and hexagonal structural defects, making it attractive
due to its simplicity, low cost, and scalability. In this sense, graphene is a promising option fto
be applied as hydrophobic coating in catalysts for PARs. This work investigated the formation
of films of graphenoid materials doped with platinum or palladium on a sintered porous metal
filter in a single step. X-ray diffraction experiments revealed high amorficity, with percentages
of approximately 49.6% and 60.0% for materials containing platinum or palladium, respectively.
The D1/G band ratios were 2.9 and 1.6 for materials with platinum or palladium, indicating the
presence of structural defects. Contact angle measurements demonstrated strong
hydrophobicity for both materials, with values of 124º and 119º, respectively. Catalytic tests
showed that the palladium-based converter was able to remove 17% of the injected
hydrogen, while the material containing platinum achieved a removal of around 23%,
confirming the effectiveness of these coatings in converting hydrogen into water. The
experimental results indicated that coating porous steel filters with graphene doped with
catalytic metals represents a promising strategy to ensure safety and efficiency in converting
hydrogen into green energy systems. This approach has significant implications for
sustainability and corporate social responsibility practices.
Como referenciar
DE MICHELI, LORENZO; SILVESTRIN, G.; SOUZA, R.F.B. de; NETO, A.O.; GIOVEDI, C. Hydrogen mitigation: passive autocatalytic recombiners using catalysts based on graphene hydrophobic coatings. In: EUROPEAN CONFERENCE AND EXHIBITION IN GRAPHENE AND 2D MATERIALS, June 25-28, 2024, Madrid, Spain. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/48957. Acesso em: 13 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.