Comparative studies for CO oxidation and hydrogenation over supported Pt catalysts prepared by different synthesis methods

Mohamed, Ziyaad; Dasireddy, Venkata D.B.C.; Singh, Sooboo; Friedrich, Holger B.

doi:10.1016/j.renene.2019.10.088

Cited by 23 publications

(8 citation statements)

References 62 publications

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“…There was no CO chemisorbed on the bare supports during the CO chemisorption studies, thus, the results obtained over the catalysts are attributed to the Ir present on the respective supports. Similarly to the data presented for the Pt systems [11,36], the CO chemisorption capacity, metallic surface area, and metal dispersion, decrease with increasing reduction temperature. The Ir-ZrO 2 catalyst showed much better CO chemisorption capacity, metallic surface area, metal dispersion, and smaller crystallite sizes, than the TiO 2 supported catalyst.…”

Section: Co Chemisorptionsupporting

confidence: 70%

“…Figure 5 shows the TPO profiles of the reduced catalyst samples. As with the Pt catalysts that we reported previously [11,36], the oxidation of these materials occurs readily at low temperatures even before the TCD records the signal. Also, according to the literature, highly dispersed Ir samples were found to be easily oxidised at low temperatures, from Ir 0 to IrO 2 [38].…”

Section: X-ray Photon Spectroscopysupporting

confidence: 63%

“…Similarly to the observed profiles in the literature [29,30,[33][34][35], under reducing environments, reducible supported PGM metals with strong metal-support interactions tend to become partially decorated by support interstitials that migrate towards and/or over the active metal at the metal-support interface. These migrations are not evident on bare supports but rather are catalysed by the active metal (Ir) as MO (2−x) species (M = Ti or Zr), as explained in various works [11,36]. This could be due to the initial reduction of metal species that strongly interact with the surface of the support.…”

Section: X-ray Photon Spectroscopymentioning

confidence: 94%

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

Mohamed¹,

Dasireddy²,

Singh³

et al. 2021

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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 properties on activity and selectivity were evaluated. Both catalysts oxidised CO to CO2 in the absence of H2, and a conversion of 70% was obtained at 200 °C. For the CO oxidation in the presence of H2 over these catalysts, the oxidation of H2 was favoured over CO due to H2 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-ZrO2 was more active, giving 99.9% CO conversions from 350 to 370 °C, with high selectivity towards CH4 using minimal H2 from the feed. Furthermore, results for the Ir-ZrO2 catalyst showed that the superior activity compared to the Ir-TiO2 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 ZrO2 support, which resulted in higher catalytic activity due to better metal dispersions, and higher CO chemisorption capacities than obtained for the Ir-TiO2 catalyst.

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Section: Co Chemisorptionsupporting

confidence: 70%

Section: X-ray Photon Spectroscopysupporting

confidence: 63%

Section: X-ray Photon Spectroscopymentioning

confidence: 94%

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

Mohamed¹,

Dasireddy²,

Singh³

et al. 2021

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“…7,8 The PROX process involves two competitive reactions, the oxidation of carbon monoxide and the oxidation of hydrogen. 10,39 The CO conversion on all prepared catalysts is signicantly decreased in the presence of H 2 . The trend of CO 2 formation decreases gradually from 45% to 25% with an increase in the temperature for Cu-CuFe 2 O 4 .…”

Section: Resultsmentioning

confidence: 96%

Heterogeneous Cu–Fe oxide catalysts for preferential CO oxidation (PROX) in H₂-rich process streams

et al. 2020

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“…Adicionalmente, etapas de lavagem, secagem, calcinação (etapa de oxidação) e de redução, (normalmente a altas temperaturas) para ativação do catalisador são necessárias. Esses métodos são os mais escolhidos devido ao baixo custo envolvido, além da possibilidade de aplicação em vários metais e suportes (YU et al, 2012;CARVALHO et al, 2018;MOHAMED et al, 2020).…”

Section: óXido De Cériounclassified

Preparação de catalisadores Pt/CeO2 via método de redução por álcool para a oxidação preferencial de monóxido de carbono em misturas ricas em hidrogênio (PROX-CO)

Queiroz¹

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Eu dedico este trabalho para todos aqueles que me apoiaram, me ajudaram, me fizeram chegar até aqui.Em especial a minha filha Sofia, ao meu esposo Tadeu, aos meus pais João Regis e Nilda, aos meus irmãos Vanessa, Katiane e Gouthier e a Elisete e tia Flor. Obrigada Família! AgradecimentosAo meu Deus, por tudo que tem feito em minha vida... Obrigada de coração a todos aqueles que de alguma forma contribuíram por esta conquista e em especial:Ao meu orientador Prof. Dr. Estevam Vitorio Spinacé, que depositou em mim sua confiança, acreditando que eu era capaz de concluir esta tese em meio a tantos compromissos de trabalho. Sua sabedoria, conhecimentos e suas críticas sempre construtivas me ajudaram na construção do saber e na qualidade deste trabalho. Ao Dr. Jorge Moreira Vaz um colaborador na arte de fazer ciência Ao IPEN (Instituto de Pesquisas Energéticas e Nucleares), em especial ao CCCH (Centro de Células a Combustível e Hidrogênio) pelas instalações e toda infraestrutura disponibilizada e ao CCTM (Centro de Ciências e Tecnologia de Materiais) pelas análises de microscopia.

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Comparative studies for CO oxidation and hydrogenation over supported Pt catalysts prepared by different synthesis methods

Cited by 23 publications

References 62 publications

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

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

Heterogeneous Cu–Fe oxide catalysts for preferential CO oxidation (PROX) in H₂-rich process streams

Preparação de catalisadores Pt/CeO2 via método de redução por álcool para a oxidação preferencial de monóxido de carbono em misturas ricas em hidrogênio (PROX-CO)

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Comparative studies for CO oxidation and hydrogenation over supported Pt catalysts prepared by different synthesis methods

Cited by 23 publications

References 62 publications

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

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

Heterogeneous Cu–Fe oxide catalysts for preferential CO oxidation (PROX) in H2-rich process streams

Preparação de catalisadores Pt/CeO2 via método de redução por álcool para a oxidação preferencial de monóxido de carbono em misturas ricas em hidrogênio (PROX-CO)

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Heterogeneous Cu–Fe oxide catalysts for preferential CO oxidation (PROX) in H₂-rich process streams