Efficiency of catalytic processes for the reduction of CO and VOC emissions from wood combustion in domestic fireplaces

Ozil, Fabien; Tschamber, Valérie; Haas, Frédéric; Trouvé, Gwenaëlle

doi:10.1016/j.fuproc.2009.03.019

Cited by 57 publications

(39 citation statements)

References 16 publications

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“…However, there is only rare documentation of the long-term stability and no comprehensive analysation of the behaviour from the used catalysts during the manifold conditions occurring in stoves and boilers. The major part of described research in literature deals with the effect of catalysts at single-room heaters [9,[13][14][15][16][17][18][19][20]. Only some results have been presented from boilers with catalysts [21][22][23].…”

Section: State Of the Art In Small-scale Systemsmentioning

confidence: 99%

“…Even though the catalytic oxidation of carbon monoxide can already take place at room temperature [24], the so far at biomass combustion systems applied catalysts show a considerable reduction at temperatures above 250-300 °C [14,20,23]. Beside a preferably low reaction temperature the catalysts in small-scale stoves and boilers also have to feature a wide range and frequent changes in temperature.…”

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

“…Beside a preferably low reaction temperature the catalysts in small-scale stoves and boilers also have to feature a wide range and frequent changes in temperature. If the catalyst is applied downstream of a stove, temperatures between 250 and 500 °C can be present [14,16,20]. When the catalyst position is inside the furnace, the temperature can rise up to 750-850 °C [9,17,22], dependent on the distance to the flame.…”

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

“…When the catalyst position is inside the furnace, the temperature can rise up to 750-850 °C [9,17,22], dependent on the distance to the flame. Since the highest pollutant emissions are generated during start and burnout phases, when the temperatures are low, catalyst heating systems are sometimes applied to gain higher pollutant reduction [14,[21][22][23]. Literature data show that catalytic conversion rates vary in a wide range and can be hardly compared because of the multitude of differences in the process conditions and mostly not precisely described catalyst probes.…”

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

“…The reduction rates for VOC are often lower than the rates for CO or at most equal. The compound methane, which has usually the highest share in VOC flue gas concentration from biomass combustion systems [14,25], is most difficult to oxidize. In this context, a high conversion rate for all VOC except methane [17] and also a fast deactivation of catalysts solely for the oxidation of methane [19] has been observed.…”

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

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Characterization and integration of oxidation catalysts at small-scale biomass combustion furnaces

et al. 2017

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Abstract. Small-scale biomass combustion is a major part in heat supply from renewable resources. Drawbacks to the environmental background are the pollutant emissions, which are formed as a result of maloperation, suboptimal furnace construction or the biomass fuel composition. The named primary factors can be influenced by several measures, but the achievable emission results are limited. To provide real clean combustion technology with nearly zero pollutant emissions, secondary emission reduction measures are necessary. One of these measures is the application of catalytic flue gas cleaning as integrated or downstream solution. Catalysis is already a state of the art element in many processes and following this, some studies reveal already its potential to reduce CO, VOC as well as particle emissions in small-scale biomass combustion systems. However, a wide application of catalysts in wood combustion units didn't take place so far, because the challenging process conditions demand a proper integration and highly stable and active catalytic materials. For the achievement of well-functioning combustion systems with catalyst solutions a procedure for application-oriented characterization is presented. Initial investigations with commercially available catalysts have shown that the gas hourly space velocity and the oxygen content have the most significant influence on the conversion rate of carbon monoxide and nitrogen oxide. Two samples with different active phases have been compared, one with solely metal oxides and one with metal oxides and noble metals. The one with noble metals showed as expected a higher activity, but also a higher stability.

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Section: State Of the Art In Small-scale Systemsmentioning

confidence: 99%

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

Section: Challenges and Chances For Emission Reduction With State Of mentioning

confidence: 99%

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Characterization and integration of oxidation catalysts at small-scale biomass combustion furnaces

et al. 2017

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Catalyst Activity Characterization and Proper Integration in Small‐Scale Biomass Combustion Systems

Müller

Hartmann

2022

Chem Eng & Technol

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Catalysts can reduce emissions from biomass combustion systems. Efficient use in small-scale applications is challenging due to the variations of temperature, fluid flow, and flue gas composition. An analytical procedure was defined and evaluated with three commercial catalysts to realize efficient integration. The characterization included activity measurements at three facilities: a model gas analysis device, a laboratory-scale combustion system, and a wood log stove. The results demonstrate the possibilities of model gas analysis to define a scope of application and also the need for catalyst characterization under real operation conditions to determine the performance and stability of the final process. Temperature and gas hourly space velocity are the two main parameters influencing catalyst activity.

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Catalyst Tests on a Pilot Plant for Small Biomass Combustion Systems

Hartmann

Lenz

Schenker

et al. 2011

Chemie Ingenieur Technik

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Catalyst Tests on a Pilot Plant for Small Biomass Combustion SystemsIn addition to the reduction of particulate matter, a catalytic supported emission reduction in small scale biomass combustion systems can also enable a conversion of toxic organic components into carbon dioxide and water. For catalyst investigations under practical conditions a special test facility was designed. The results show that products of incomplete combustion like carbon monoxide from stoves can be reduced by catalytic processes. Further developments and studies are necessary to achieve the targeted emission limits.

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Efficiency of catalytic processes for the reduction of CO and VOC emissions from wood combustion in domestic fireplaces

Cited by 57 publications

References 16 publications

Characterization and integration of oxidation catalysts at small-scale biomass combustion furnaces

Characterization and integration of oxidation catalysts at small-scale biomass combustion furnaces

Catalyst Activity Characterization and Proper Integration in Small‐Scale Biomass Combustion Systems

Catalyst Tests on a Pilot Plant for Small Biomass Combustion Systems

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