Copper‐Based Catalysts Supported on Highly Porous Silica for the Water Gas Shift Reaction

Marras, Claudia; Loche, Danilo; Carta, Daniela; Casula, Maria Francesca; Schirru, Manuela; Cutrufello, Maria Giorgia; Corrias, Anna

doi:10.1002/cplu.201500395

Cited by 14 publications

(7 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…TiO 2 is considered a good choice for catalyst support on the basis of as low-cost, non-toxic, and chemically stable nature. Some supports such as CeO 2 with variable oxidation states tend to be more effective only under specific conditions [134]. During the low-temperature WGSR, some metals, e.g., gold nanoparticles, tend to agglomerate even on rigid support like TiO 2 which has a higher ability to disperse them; nonetheless, this effect is reported to depend on the catalyst synthesis method as well [135].…”

Section: Type Of Metal Oxide Supportmentioning

confidence: 99%

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: Type Of Metal Oxide Supportmentioning

confidence: 99%

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

2020

View full text Add to dashboard Cite

show abstract

“…However, very recently the potential of SBA-16 as a support for copper-based catalysts for the WGSR has been investigated. 19 In this work, SBA-16 type silica is used as a support for CeO 2 and Pt nanophases with the aim of designing innovative catalysts for the LT-WGSR. The catalyst synthesis was designed to conne both CeO 2 and Pt nanoparticles within the mesoporous silica scaffold.…”

Section: Introductionmentioning

confidence: 99%

The water gas shift reaction over Pt–CeO₂ nanoparticles confined within mesoporous SBA-16

et al. 2017

View full text Add to dashboard Cite

Novel nanocomposite catalysts for the single step Water Gas Shift Reaction (WGSR) were prepared by deposition–precipitation and impregnation of Pt–CeO2 nanophases onto an ordered mesoporous silica support featuring a cubic arrangement of mesopores (SBA-16 type). The highly interconnected porosity of the SBA-16 developed in three dimensions (3D) provides a scaffold which is easily accessible to reactants and products by diffusion. The textural and morphological properties of the final catalyst were affected by the procedure utilized for dispersion of the nanophases onto SBA-16. The catalysts prepared by deposition–precipitation present highly dispersed nanocrystalline CeO2 on the surface of SBA-16 and retain a high surface area, high thermal stability and high Pt accessibility. The catalysts prepared by impregnation show improved Pt–CeO2 interaction but a more significant decrease of surface area compared to pure SBA-16, due to the confinement of the CeO2 crystallites within the mesoporous matrix. As a result, the catalysts prepared by deposition–precipitation are effective for the WGSR under working conditions in the high temperature range (around 300–350 °C), whereas the catalysts prepared by impregnation are suitable for the process operating at low temperature. Our results point out that these catalyst preparation procedures can be used to optimise the performance of heterogenous catalysts, by controlling the CeO2 crystallite size and optimizing the Pt–CeO2 contact by embedding. Improved thermal and chemical stabilities were achieved using a mesoporous scaffold

show abstract

“…[1,13,14] Several syntheses of powdered mesoporous materials modified with Cu(CuOx) NPs have been reported in the literature. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] In most of those cases, Cu (II) is first adsorbed to the mesoporous surface through surface functionalization, and then a thermal treatment follows that results in the NPs formation. The Cu(CuOx) mesoporous composite powders have been mainly applied on catalysis of organic reactions.…”

Section: Introductionmentioning

confidence: 99%

Copper nanoparticles synthesis in hybrid mesoporous thin films: Controlling oxidation state and catalytic performance through pore chemistry

Rodríguez

Yate

Coy

et al. 2019

Applied Surface Science

View full text Add to dashboard Cite

The room temperature synthesis of copper (Cu) nanoparticles (NPs) supported within SiO 2 mesoporous thin films (MTF) modified with either COOH or NH 2 functional groups is reported. The functional groups present in the MTF surface acted as adsorption sites for Cu (II) ions, which were afterwards reduced to Cu NPs in presence of sodium borohydride at room temperature. The oxidation state of the copper NPs, corroborated by X-ray Photoelectron Spectroscopy and Electron Energy Loss Spectroscopy, was strongly dependent on the functional group present in the pores of the MTF and on the number of adsorption/reduction (A/R) cycles applied for NPs loading. Metallic Cu (0) NPs were obtained in MTFs displaying COOH groups applying 10 A/R cycles while NPs with higher oxidation state were as well present after 20 A/R cycles. For MTF functionalized with NH 2 groups the copper is present as Cu (I) and Cu(II) in the NPs but no Cu (0) can be detected. The MTF-Cu(CuOx) composite materials were tested as catalysts for the reduction of 4-nitrophenol in the presence of NaBH 4 . Catalytic activity of composite materials depends on the oxidation state of Cu NPs, being more active those samples containing Cu (0) NPs, synthesized from COOH functionalized MTFs.

show abstract

Copper‐Based Catalysts Supported on Highly Porous Silica for the Water Gas Shift Reaction

Abstract: Supporting informationfor this article can be found under http:// dx.doi.org/10.1002/cplu.201500395. It contains:characterisation of the SiO 2 matrices;N 2 physisorption results for AeroCAT_asd and MesoCAT_ B_0.8;t hermal analysisoft he catalysts;a nd additionalc atalyticresults.

Cited by 14 publications

References 57 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

The water gas shift reaction over Pt–CeO₂ nanoparticles confined within mesoporous SBA-16

Copper nanoparticles synthesis in hybrid mesoporous thin films: Controlling oxidation state and catalytic performance through pore chemistry

Contact Info

Product

Resources

About

Copper‐Based Catalysts Supported on Highly Porous Silica for the Water Gas Shift Reaction

Abstract: Supporting informationfor this article can be found under http:// dx.doi.org/10.1002/cplu.201500395. It contains:characterisation of the SiO 2 matrices;N 2 physisorption results for AeroCAT_asd and MesoCAT_ B_0.8;t hermal analysisoft he catalysts;a nd additionalc atalyticresults.

Cited by 14 publications

References 57 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

The water gas shift reaction over Pt–CeO2 nanoparticles confined within mesoporous SBA-16

Copper nanoparticles synthesis in hybrid mesoporous thin films: Controlling oxidation state and catalytic performance through pore chemistry

Contact Info

Product

Resources

About

The water gas shift reaction over Pt–CeO₂ nanoparticles confined within mesoporous SBA-16