AuCu/TiO2 catalysts prepared using electron beam irradiation for the preferential oxidation of carbono monoxide in hydrogen-rich mixtures
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2019
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
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The major part of the world production of hydrogen is originated from a combination of methane steam
reforming and water gas shift reaction resulting in a n H 2 rich mixture known as reformate gas, which contains
about 1% vol (10, 000 p pm) of carbon monoxide (CO). The preferential oxidation reaction of CO in H 2 rich
mixtures (CO PROX) has been considered a very promising process for H 2 purification, reducing CO for values
below 50 ppm allowing its use in Proton Exchange Membrane Fuel Cells (PEMFC). Au nanopart icles supported
on TiO 2 (Au/TiO 2 ) catalysts have been shown good activity and selectivity for CO PROX reaction in the
temperature range between 20 ºC and 80 ºC; however, the catalytic activity strongly depend s on the preparation
method. Also, the addition of Cu to the Au/TiO 2 catalyst could increase the activity and selectivity for CO
PROX reaction. In this work, AuCu/TiO 2 catalysts with composition 0.5%Au0. 5%Cu/TiO 2 were prepared in a
single step using electron beam irradiation, where the Au 3+ and Cu 2+ ion s were dissolved in water/2 propanol
solution , the TiO 2 support was dispersed and the obtained mixture was irradiated under stirring at room
temperature using different dose rates ( 8 64 kGy s 1 ) and doses 144 576 kGy The catalysts were
characterized by energy dispersive X ray analysis (EDX), X ray diffraction (XRD), transmissi on electron
microscopy (TEM), temperature programmed reduction (TPR) and tested for CO PROX reaction In the studied
conditions, it was observed that the increase of t he dose rate and the total dose contributed to a decrease in the
mean nanoparticle sizes. The best result was obtained with a catalyst prepared with a dose rate of 64 kGy s 1 and
a dose of 576 kGy showed a CO conversion of 45% and a CO 2 selectivity of 30% at 150 o C.
Como referenciar
ALENCAR, CATARINE S.L.; PAIVA, ANA R.N.; SILVA, LEONARDO G. de A. e; SOMESSARI, ELIZABETH S.R.; VAZ, JORGE M.; SPINACE, ESTEVAM V. AuCu/TiO2 catalysts prepared using electron beam irradiation for the preferential oxidation of carbono monoxide in hydrogen-rich mixtures. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 2481-2491. Disponível em: http://repositorio.ipen.br/handle/123456789/30635. Acesso em: 15 Jun 2024.
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.