Washcoating vs. direct synthesis of LaCoO 3 on monoliths for environmental applications

Guiotto, M.; Pacella, Michael S.; Perin, Giovanni; Iovino, Alessandro; Michelon, Nicola; Natile, Marta Maria; Glisenti, Antonella; Canu, Paolo

doi:10.1016/j.apcata.2015.04.013

Cited by 37 publications

(15 citation statements)

References 47 publications

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“…The significant changes in species distribution for LaCo/LaCo-S and LaCoMn/LaCoMn-S may be related to higher interaction between Co-containing catalysts and cordierite monoliths, as suggested by Guiotto et al [24]. Therefore, the LaMn catalyst was less affected by the washcoating procedure to anchor the catalyst and showed better incorporation of the species in the perovskite-like structure.…”

Section: X-ray Photoelectronic Spectroscopy (Xps) Analysesmentioning

confidence: 71%

“…The average yield of self-combustion synthesis was 73%, considering losses caused by reaction aggressiveness. In this study, the washcoating methodology was chosen over direct synthesis for monolithic catalyst preparation since it is expected to have higher catalyst load and higher catalytic activity [24,25,37,38]. Additionally, sonication was used during the washcoating methodology to improve the catalyst dispersion onto the monolithic structure).…”

Section: Synthesis Of Powder and Monolithic Catalystsmentioning

confidence: 99%

“…Assuming that binder contribution cannot be higher than 3.0%, a perovskite load around 5% (mass fraction) can be estimated, equivalent to ~290 mg of perovskite per monolith. In most studies, catalysts based on noble metals such as Pt or Pd usually do not exceed 1% [39][40][41] considering their high competitiveness, whereas perovskite-like loads can reach around 30% or even more with better profitability [23,24]. However, the catalyst load stays in the background for processes with minimal diffusional limitations (high flows) where the amount of available surface is more important [42].…”

Section: Synthesis Of Powder and Monolithic Catalystsmentioning

confidence: 99%

“…On the other hand, for industrial gas phase applications, honeycomb-type structures (or monoliths) are ideal supports to setup catalysts, allowing for a good contact area with minimum pressure drop [23]. Guiotto [24] and Schneider [25] compared two common impregnation methods (direct synthesis vs. washcoating) for anchoring a perovskite-like catalyst onto a ceramic monolith, finding good reproducibility and homogeneity, and fewer stages for direct synthesis, but higher catalyst load and better catalytic activity for washcoating.…”

Section: Introductionmentioning

confidence: 99%

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Approach to the Characterization of Monolithic Catalysts Based on La Perovskite-like Oxides and Their Application for VOC Oxidation under Simulated Indoor Environment Conditions

et al. 2022

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Catalysts are very important in controlling the pollutant emissions and are used for hundreds of chemical processes. Currently, noble metal-based catalysts are being replaced for other kinds of materials. In this study, three lanthanum-based perovskite-like oxides were synthesized (LaCo, LaCoMn, and LaMn) by the glycine-combustion method. The powder catalysts obtained were supported onto cordierite ceramic monoliths using an optimized washcoating methodology to obtain the subsequent monolithic catalysts (LaCo-S, LaCoMn-S, and LaMn-S). Sample characterization confirmed the formation of the perovskite-like phase in the powder materials as well as the presence of the perovskite phase after supporting it onto the monolithic structure. The XPS analysis showed a general decrease in lattice oxygen species for monolithic catalysts, mainly caused by the colloidal silica used as a binder agent during the washcoating process. Additionally, some variations in the oxidation state distribution for elements in Co-containing systems suggest a stronger interaction between cordierite and such catalysts. The catalytic activity results indicated that powder and monolithic catalysts were active for single-component VOC oxidation in the following order: 2-propanol > n-hexane ≅ mixture > toluene, and there was no evidence of loss of catalytic activity after supporting the catalysts. However, LaMn-S had a better catalytic performance for all VOC tested under dry conditions, achieving oxidation temperatures between 230–420 °C. The oxidation efficiency for the VOC mixture was strongly affected by the presence of moisture linking the oxidation efficiency at wet conditions to the VOC chemical nature. Additionally, for higher VOC concentrations, the catalyst efficiency decreased due to the limited number of active sites.

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Section: X-ray Photoelectronic Spectroscopy (Xps) Analysesmentioning

confidence: 71%

Section: Synthesis Of Powder and Monolithic Catalystsmentioning

confidence: 99%

Section: Synthesis Of Powder and Monolithic Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Approach to the Characterization of Monolithic Catalysts Based on La Perovskite-like Oxides and Their Application for VOC Oxidation under Simulated Indoor Environment Conditions

et al. 2022

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“…The traditional approach is rather time-and material-consuming, being composed by several steps of immersion in a perovskite suspension followed by heat treatments carried out slowly enough to avoid cracks in the active layer. With the aim of saving time and materials and thus to increase the sustainability of the catalytic system, we developed, starting from the Marcilly wet chemistry synthesis, an innovative procedure consisting in growing the perovskite directly on the cordierite honeycomb [24].…”

Section: From the Powder To A Functional Device: The Art Of Depositionmentioning

confidence: 99%

Developing Functionality in Perovskites from Abatement of Pollutants to Sustainable Energy Conversion and Storage

Bedon¹,

Glisenti²

2020

Perovskite Materials, Devices and Integration

Self Cite

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Different functionalities can be developed and optimised in perovskites by means of different approaches: doping, nanocomposition and exsolution. In our research, these strategies are used with the aim of a sustainable development. Our objectives are in developing perovskite-based materials for catalysis and electrocatalysis. In particular, we successfully obtained catalysts for abatement of pollutants in three-way catalysts, catalysts for dry reforming of methane and electrocatalysts for solid oxide cells (solid oxide fuel cells and solid oxide electrolysers). In all cases, the corresponding device and experimental setup was optimised. The catalysts and electro-catalysts we considered are free of noble metals and with minimum amount of critical raw materials. The preparation procedures are by wet chemistry, highly reproducible and up-scalable.

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washcoating

Sloby¹

2020

Catalysis From a to Z

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Washcoating vs. direct synthesis of LaCoO 3 on monoliths for environmental applications

Cited by 37 publications

References 47 publications

Approach to the Characterization of Monolithic Catalysts Based on La Perovskite-like Oxides and Their Application for VOC Oxidation under Simulated Indoor Environment Conditions

Approach to the Characterization of Monolithic Catalysts Based on La Perovskite-like Oxides and Their Application for VOC Oxidation under Simulated Indoor Environment Conditions

Developing Functionality in Perovskites from Abatement of Pollutants to Sustainable Energy Conversion and Storage

washcoating

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