The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO2 and IR-ZrO2 Catalysts

CO hydrogenation and oxidation were conducted over Ir supported on TiO2 and ZrO2 catalysts using a feed mimicking the water–gas shift reformate stream. The influence of the support interaction with Ir and the catalysts’ redox and CO chemisorption propert...

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Autores principales:	Ziyaad Mohamed, Venkata D. B. C. Dasireddy, Sooboo Singh, Holger B. Friedrich
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	iridium preferential oxidation hydrogenation spillover isoelectric point Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/660a069faeab4454a66019e1db497140
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spelling	oai:doaj.org-article:660a069faeab4454a66019e1db4971402021-11-25T17:06:32ZThe Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts10.3390/catal111113782073-4344https://doaj.org/article/660a069faeab4454a66019e1db4971402021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1378https://doaj.org/toc/2073-4344CO hydrogenation and oxidation were conducted over Ir supported on TiO<sub>2</sub> and ZrO<sub>2</sub> catalysts using a feed mimicking the water–gas shift reformate stream. The influence of the support interaction with Ir and the catalysts’ redox and CO chemisorption properties on activity and selectivity were evaluated. Both catalysts oxidised CO to CO<sub>2</sub> in the absence of H<sub>2</sub>, and a conversion of 70% was obtained at 200 °C. For the CO oxidation in the presence of H<sub>2</sub> over these catalysts, the oxidation of H<sub>2</sub> was favoured over CO due to H<sub>2</sub> spillover occurring at the active metal and support interface, resulting in the formation of interstitials catalysed by Ir. However, both catalysts showed promising activity for CO hydrogenation. Ir-ZrO<sub>2</sub> was more active, giving 99.9% CO conversions from 350 to 370 °C, with high selectivity towards CH<sub>4</sub> using minimal H<sub>2</sub> from the feed. Furthermore, results for the Ir-ZrO<sub>2</sub> catalyst showed that the superior activity compared to the Ir-TiO<sub>2</sub> catalyst was mainly due to the reducibility of the support and its interaction with the active metal. Controlling the isoelectric point during the synthesis allowed for a stronger interaction between Ir and the ZrO<sub>2</sub> support, which resulted in higher catalytic activity due to better metal dispersions, and higher CO chemisorption capacities than obtained for the Ir-TiO<sub>2</sub> catalyst.Ziyaad MohamedVenkata D. B. C. DasireddySooboo SinghHolger B. FriedrichMDPI AGarticleiridiumpreferential oxidationhydrogenationspilloverisoelectric pointChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1378, p 1378 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	iridium preferential oxidation hydrogenation spillover isoelectric point Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	iridium preferential oxidation hydrogenation spillover isoelectric point Chemical technology TP1-1185 Chemistry QD1-999 Ziyaad Mohamed Venkata D. B. C. Dasireddy Sooboo Singh Holger B. Friedrich The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts
description	CO hydrogenation and oxidation were conducted over Ir supported on TiO<sub>2</sub> and ZrO<sub>2</sub> catalysts using a feed mimicking the water–gas shift reformate stream. The influence of the support interaction with Ir and the catalysts’ redox and CO chemisorption properties on activity and selectivity were evaluated. Both catalysts oxidised CO to CO<sub>2</sub> in the absence of H<sub>2</sub>, and a conversion of 70% was obtained at 200 °C. For the CO oxidation in the presence of H<sub>2</sub> over these catalysts, the oxidation of H<sub>2</sub> was favoured over CO due to H<sub>2</sub> spillover occurring at the active metal and support interface, resulting in the formation of interstitials catalysed by Ir. However, both catalysts showed promising activity for CO hydrogenation. Ir-ZrO<sub>2</sub> was more active, giving 99.9% CO conversions from 350 to 370 °C, with high selectivity towards CH<sub>4</sub> using minimal H<sub>2</sub> from the feed. Furthermore, results for the Ir-ZrO<sub>2</sub> catalyst showed that the superior activity compared to the Ir-TiO<sub>2</sub> catalyst was mainly due to the reducibility of the support and its interaction with the active metal. Controlling the isoelectric point during the synthesis allowed for a stronger interaction between Ir and the ZrO<sub>2</sub> support, which resulted in higher catalytic activity due to better metal dispersions, and higher CO chemisorption capacities than obtained for the Ir-TiO<sub>2</sub> catalyst.
format	article
author	Ziyaad Mohamed Venkata D. B. C. Dasireddy Sooboo Singh Holger B. Friedrich
author_facet	Ziyaad Mohamed Venkata D. B. C. Dasireddy Sooboo Singh Holger B. Friedrich
author_sort	Ziyaad Mohamed
title	The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts
title_short	The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts
title_full	The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts
title_fullStr	The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts
title_full_unstemmed	The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts
title_sort	mitigation of co present in the water–gas shift reformate gas over ir-tio<sub>2</sub> and ir-zro<sub>2</sub> catalysts
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/660a069faeab4454a66019e1db497140
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The Mitigation of CO Present in the Water–Gas Shift Reformate Gas over IR-TiO<sub>2</sub> and IR-ZrO<sub>2</sub> Catalysts

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