Water-gas shift reaction on alumina-supported Pt-CeO catalysts prepared by supercritical fluid deposition

Deal, Joshua; Le, Phong Q.; Corey, C. Blake; More, Karren L.; West, Christy Wheeler

doi:10.1016/j.supflu.2016.08.016

Cited by 17 publications

(11 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The use of supercritical fluid deposition (SCFD) is considered a promising catalyst preparation method, which has been recently highlighted in some studies. Deal et al synthesized platinum catalysts on alumina support, both in the presence and absence of ceria by this method and tested them for WGS reaction [39]. The result of the analysis showed Pt to be in a highly dispersed form on the support.…”

Section: Noble Metal Basedmentioning

confidence: 99%

“…Measuring the reaction rate confirmed that the catalyst was more active for WGS, with the rates per Pt mass exceeding the values reported in most literature for WGS reaction on the Pt-CeO x catalysts. The high catalytic activity was attributed to the considerable amount of interfacial platinum/ceria contacts due to unique nanoscale interactions [39]. Kaftan et al investigated KOHcoating Pt/alumina catalytic performance on WGS reaction [40].…”

Section: Noble Metal Basedmentioning

confidence: 99%

“…b, c SEM microphotographs of the micro monoliths Au/CeFe catalyst: b front; c crosssection view [52]. HRTEM images of d, e the 5Au/Fe 2 O 3 DP fresh and used (f, g) 1.5Au/Fe 2 O 3 LPRD fresh and used catalysts, respectively [39]. HAADF-STEM images of h, i fresh (2%) Au/α-MoC, j used (2%) Au/α-MoC, and k the (2%) Au/α-MoC catalyst after NaCN leaching, representing predominantly Au single atoms in which most of them overlapped with Mo sites in the support lattice (very bright features were created by overlapping MoC particles.…”

Section: Noble Metal Basedmentioning

confidence: 99%

See 2 more Smart Citations

A review of recent advances in water-gas shift catalysis for hydrogen production

2020

View full text Add to dashboard Cite

The water-gas shift reaction (WGSR) is an intermediate reaction in hydrocarbon reforming processes, considered one of the most important reactions for hydrogen production. Here, water and carbon monoxide molecules react to generate hydrogen and carbon dioxide. From the thermodynamics aspect, pressure does not have an impact, whereas low-temperature conditions are suitable for high hydrogen selectivity because of the exothermic nature of the WGSR reaction. The performance of this reaction can be greatly enhanced in the presence of suitable catalysts. The WGSR has been widely studied due do the industrial significance resulting in a good volume of open literature on reactor design and catalyst development. A number of review articles are also available on the fundamental aspects of the reaction, including thermodynamic analysis, reaction condition optimization, catalyst design, and deactivation studies. Over the past few decades, there has been an exceptional development of the catalyst characterization techniques such as near-ambient x-ray photoelectron spectroscopy (NA-XPS) and in situ transmission electron microscopy (in situ TEM), providing atomic level information in presence of gases at elevated temperatures. These tools have been crucial in providing nanoscale structural details and the dynamic changes during reaction conditions, which were not available before. The present review is an attempt to gather the recent progress, particularly in the past decade, on the catalysts for lowtemperature WGSR and their structural properties, leading to new insights that can be used in the future for effective catalyst design. For the ease of reading, the article is divided into subsections based on metals (noble and transition metal), oxide supports, and carbon-based supports. It also aims at providing a brief overview of the reaction conditions by including a table of catalysts with synthesis methods, reaction conditions, and key observations for a quick reference. Based on our study of literature on noble metal catalysts, atomic Pt substituted Mn 3 O 4 shows almost full CO conversion at 260°C itself with zero methane formation. In the case of transition metals group, the inclusion of Cu in catalytic system seems to influence the CO conversion significantly, and in some cases, with CO conversion improvement by 65% at 280°C. Moreover, mesoporous ceria as a catalyst support shows great potential with reports of full CO conversion at a low temperature of 175°C.

show abstract

Section: Noble Metal Basedmentioning

confidence: 99%

Section: Noble Metal Basedmentioning

confidence: 99%

Section: Noble Metal Basedmentioning

confidence: 99%

See 1 more Smart Citation

A review of recent advances in water-gas shift catalysis for hydrogen production

2020

View full text Add to dashboard Cite

show abstract

“…West et al reported a new generation of highly performant catalysts towards WGSR based on Al 2 O 3 -supported Pt-CeO x catalysts via supercritical fluid deposition from the organometallic precursor platinum(II) acetylacetonate. These supported Pt-CeO x catalysts featured PtNPs encapsulated in crystalline ceria and showed higher activity and greater reaction rates per mass of Pt than most literature values for WGSR on analogous Pt-CeOx catalysts [128]. Overall, these results show the great promise of SFRD as scalable means towards high performance catalysts enabling an efficient utilization of precious metals for the production of commodity gases such as H 2 [128].…”

Section: Applications In Catalysis Of Bmnps In Supercritical Fluidsmentioning

confidence: 69%

Bimetallic Nanoparticles in Alternative Solvents for Catalytic Purposes

et al. 2017

View full text Add to dashboard Cite

Bimetallic nanoparticles represent attractive catalytic systems thanks to the synergy between both partners at the atomic level, mainly induced by electronic effects which in turn are associated with the corresponding structures (alloy, core-shell, hetero-dimer). This type of engineered material can trigger changes in the kinetics of catalyzed processes by variations on the electrophilicity/nucleophilicity of the metal centers involved and also promote cooperative effects to foster organic transformations, including multi-component and multi-step processes. Solvents become a crucial factor in the conception of catalytic processes, not only due to their environmental impact, but also because they can preserve the bimetallic structure during the catalytic reaction and therefore increase the catalyst lifetime. In this frame, the present review focuses on the recent works described in the literature concerning the synthesis of bimetallic nanoparticles in non-conventional solvents, i.e., other than common volatile compounds, for catalytic applications.

show abstract

“…Then, the deposited compound is reduced to a metal either thermally, by molecular hydrogen, or by other reducing agents. As such, nanosized particles of various metals have been obtained by deposition on the surface of inorganic carriers, for example, on γ-alumina [3,4], mesoporous silicon, aluminum oxides [5][6][7], soot [8], graphene [9,10], carbon nanotubes [11,12], and aerogels [13,14]. For carriers of a polymer nature, this method has been used much less frequently.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Supported Heterogeneous Catalysts by Laser Ablation of Metallic Palladium in Supercritical Carbon Dioxide Medium

et al. 2020

View full text Add to dashboard Cite

To obtain a supported heterogeneous catalyst, laser ablation of metallic palladium in supercritical carbon dioxide was performed in the presence of a carrier, microparticles of γ-alumina. The influence of the ablation process conditions—including supercritical fluid density, ablation, mixing time of the mixture, and laser wavelength—on the completeness and efficiency of the deposition of palladium particles on the surface of the carrier was studied. The obtained composites were investigated by scanning and transmission electron microscopy using energy dispersive spectroscopy. We found that palladium particles were nanosized and had a narrow size distribution (2–8 nm). The synthesized composites revealed high activity as catalysts in the liquid-phase hydrogenation of diphenylacetylene.

show abstract

Water-gas shift reaction on alumina-supported Pt-CeO catalysts prepared by supercritical fluid deposition

Cited by 17 publications

References 74 publications

A review of recent advances in water-gas shift catalysis for hydrogen production

A review of recent advances in water-gas shift catalysis for hydrogen production

Bimetallic Nanoparticles in Alternative Solvents for Catalytic Purposes

Synthesis of Supported Heterogeneous Catalysts by Laser Ablation of Metallic Palladium in Supercritical Carbon Dioxide Medium

Contact Info

Product

Resources

About