Promotion effect of water in catalytic fireplace soot oxidation over silver and platinum

Shromova, Olga A.; Kinnunen, Niko M.; Pakkanen, Tapani A.; Suvanto, Mika

doi:10.1039/c7ra09291a

Cited by 12 publications

(9 citation statements)

References 50 publications

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“…Aneggi et al demonstrated that the zero-oxidation state of silver is favoured on alumina as the support material and concluded that metallic silver is the most active form [22]. However, previous studies [25,41] have shown that AgO x is the active form during the oxidation of soot; in our case, all the catalysts that contained AgO x were the most active. Hence, we concluded that silver oxide was responsible for the good activities of catalysts R2, Ag-AH1 and Ag-AH3.…”

Section: Powder X-ray Diffraction Patterns Of the Catalystscontrasting

confidence: 46%

“…In diesel particulate filters, NO2 oxidises soot, whereas in our study NO or NO2 were not present during the measurements. It is likely that the oxidation of soot with the Pt catalyst required the assistance of NO; hence, Pt alone was unable to efficiently oxidise soot because the level of NO2 generated under fireplace conditions was rather low [25,26]. Figure 5 shows the soot-oxidation temperature as a function of the dispersiveness of the active metals in the catalyst in this study.…”

Section: Steady-state Soot-oxidation Activitymentioning

confidence: 94%

“…With this in mind, as well as the high costs of platinum-group metals, other solutions have been explored, with Ag, among non-platinum-group metal catalysts, exhibiting promising catalytic soot-oxidation performance in diesel vehicles [19][20][21][22][23]. In fact, according to previous studies, Ag has been shown to exhibit superior performance to Pt at oxidising soot in studies that tailor catalysts to fireplace conditions [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Developmental Study of Soot-Oxidation Catalysts for Fireplaces: The Effect of Binder and Preparation Techniques on Catalyst Texture and Activity

2019

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An awareness of increasing climate and health problems has driven the development of new functional and affordable soot-oxidation catalysts for stationary sources, such as fireplaces. In this study, Al(OH)3, water glass and acidic aluminium phosphate binder materials were mixed with soot-oxidation catalysts. The effect of the binder on the performance of the Ag/La-Al2O3 catalyst was examined, while the Pt/La-Al2O3 catalyst bound with Al(OH)3 was used as a reference. Soot was oxidised above 340 °C on the Ag/La-Al2O3 catalyst, but at 310 °C with same catalyst bound with Al(OH)3. The addition of water glass decreased the catalytic performance because large silver crystals and agglomeration resulted in a blockage of the support material’s pores. Pt/La-Al2O3 bound with Al(OH)3 was ineffective in a fireplace environment. We believe that AgOx is the active form of silver in the catalyst. Hence, Ag/La-Al2O3 was shown to be compatible with the Al(OH)3 binder as an effective catalyst for fireplace soot oxidation.

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Section: Powder X-ray Diffraction Patterns Of the Catalystscontrasting

confidence: 46%

Section: Steady-state Soot-oxidation Activitymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Developmental Study of Soot-Oxidation Catalysts for Fireplaces: The Effect of Binder and Preparation Techniques on Catalyst Texture and Activity

2019

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“…The use of catalytic converters has been explored at the laboratory and pilot scale, focusing on the major primary pollutants including gases and primary particles, − but studies lack any assessment of SOA abatement. As the application of catalytic converters remains challenging, , further scientific studies are needed to establish their potential, especially when trace pollutants are considered.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Secondary Organic Aerosol Formation from Log Wood Burning Emissions by Catalytic Removal of Aromatic Hydrocarbons

Pieber

Kambolis

Ferri

et al. 2018

Environ. Sci. Technol.

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Log wood burning is a significant source of volatile organic compounds including aromatic hydrocarbons (ArHC). ArHC are harmful, reactive in the ambient atmosphere, and important secondary organic aerosol (SOA) precursors. Consequently, SOA is a major fraction of the total organic aerosol emitted by log wood burning. ArHC reduction is thus critical in the mitigation of adverse health and environmental impacts of log wood burning. In this study, two Pt-based catalytic converters were prepared and tested for the mitigation of real-world log wood burning emissions, including ArHC and SOA (studied using a potential aerosol mass oxidation flow reactor), as well as toxic carbon monoxide (CO) and methane, a greenhouse gas. Substantial removal of mono-and polycyclic ArHC and in particular phenolic compounds was achieved with both catalysts operated at realistic chimney temperatures (50% conversion was achieved at 200 and 300°C for non-methane hydrocarbons in our experiments for Pt/Al 2 O 3 and Pt/CeO 2 -Al 2 O 3 respectively). The catalytically cleaned emissions exhibited a substantially reduced SOA formation already at temperatures as low as 185 to 310°C, which substantially lowers the total PM burden of log wood burning. Thus, catalytic converters can effectively reduce primary and secondary log wood burning pollutants and thereby, their adverse health and environmental effects.

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“…To improve the soot oxidation of the SCC tubes, the tubes could be coated with a soot oxidation catalyst. For example, aluminum oxide-supported silver catalysts have displayed reasonably low temperature soot oxidation performance, and could be utilized to clean the tubes at a temperature as low as 310 • C [33,42]. respectively.…”

Section: Long-term Scc Performance Under Sooty Conditionsmentioning

confidence: 99%

High Temperature Electrical Charger to Reduce Particulate Emissions from Small Biomass-Fired Boilers

et al. 2020

Self Cite

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New particulate matter (PM) filtering technologies are needed to meet the emission regulations for small combustion appliances. In this work, we investigate the performance of a novel electrical particle filtration system, the single needle shielded corona charger (SCC), which offers an advantageous solution for PM control in boilers by enhancing particulate deposition within existing boiler sections. Experiments under different operating conditions of a wood-fired boiler were performed, wherein the SCC was installed upstream of either a condensing heat exchanger (CHX) or a cyclone. PM reduction was found to be strongly affected by the SCC temperature and the following collection surface area, and reached its highest reduction efficiency of >90% at the temperature range of 400–500 °C when operating in combination with a CHX. The SCC–cyclone combination was less efficient, providing a 27% PM reduction, as a result of the low surface area and residence time in the cyclone. These results indicate that the SCC can feasibly provide particle filtration when combined with a CHX, wet scrubber, or a cyclone to meet the new emission regulation requirements. The system is best suited for small-scale boilers but can be scaled up to larger boilers by increasing the number of corona chargers.

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Promotion effect of water in catalytic fireplace soot oxidation over silver and platinum

Abstract: The activity of the catalysts in the fireplace soot oxidation depends on water content in the gas feed. Water is partially dissociated with formation of hydroxyls over silver and platinum, which promote soot oxidation.

Cited by 12 publications

References 50 publications

Developmental Study of Soot-Oxidation Catalysts for Fireplaces: The Effect of Binder and Preparation Techniques on Catalyst Texture and Activity

Developmental Study of Soot-Oxidation Catalysts for Fireplaces: The Effect of Binder and Preparation Techniques on Catalyst Texture and Activity

Mitigation of Secondary Organic Aerosol Formation from Log Wood Burning Emissions by Catalytic Removal of Aromatic Hydrocarbons

High Temperature Electrical Charger to Reduce Particulate Emissions from Small Biomass-Fired Boilers

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