Developpement of cobalt-based active phase for the detection of methane and carbon dioxide

Tin oxide is widely used in the fabrication of catalytic gas sensor, due to its capacity to generate an electronic signal easy to measure, and its high resistance to poisonning and aging. However, all the experiments performed showed clearly the total absence of interaction between our chosen active phase and the two target gases. This could be explained by the fact that tin oxide is exclusively used with doping material such as platinum, palladium or gold. It could also explain why tin oxide sensor have such a high resistance to poisonning. However, it means that, before any sensor prototype could be built using tin oxide, an important study will be required, in order to determine which doping material is the most promising, and the amount needed to acquire a good interaction with the target gasesinfo:eu-repo/semantics/nonPublishe

Preliminary studies for the developpement of cobalt-based active phase for the detection of methane and carbon dioxide

The important development of biogas plants requires the use of high performance new sensors to analyze the composition of the gas produced. They must be able to combine rapidity, reliability, and precision with an easy and inexpensive utilization. Such a sensor does not currently exist. Sensors based on the detection of a catalytically induced reaction are what seems to be the most promising possibility. There are a large number of active phases currently under study. This work focuses on cobalt systems. The active phases that we studied were made by the decomposition of cobalt oxalate in Ar, Ar/H2 or Ar/O2, giving us respectively a mix of CoO/Co, metallic Co or Co3O4. The active phase was then put in a flow of methane or carbon dioxide, and the evolution of the composition of the flow was studied by MS measurements. If any change in the composition is observed, it is a proof that an interaction occurs between the active phase and the target gases. CoO/Co and Co3O4 demonstrate such changes, proving that they are able to interact with the gases. They can even be reduced by methane, yielding carbon dioxide. Such a reaction could be the sign that the oxidation of methane on cobalt based catalyst follows a Mars-van Krevelen mechanism. However, we are still facing two difficulties: temperatures needed to evidence a reaction with methane can be quite high, and a good way to place the active phase on a micro-chip sensor is still needed.info:eu-repo/semantics/nonPublishe

On the activation of methane and carbon dioxide at room temperature using cobalt oxide catalysts

info:eu-repo/semantics/nonPublishe

Deposition of cobalt based active phase on porous silicon support for biogas analysis

It has been demonstrated that cobalt oxide prepared by oxalate decomposition in oxygen adsorbsboth carbon dioxide and methane.Even if our main concern is related to the development of catalytic sensors, the activation of bothmethane and carbon dioxide at room temperature is of interest for a number of heterogeneouscatalysis systems.In our case, the development of a deposition technique providing high surface area CO3O4depositon the sensor has been successful.info:eu-repo/semantics/nonPublishe

Deposition of cobalt based active phase on porous silicon support for biogas analysis

Methane and carbon dioxide activation play a major role in catalysis processes like dry reforming, syngas production and others. Any valorisation of CO2 and CH4 must take into account that they are strong greenhouse gases. CO2 and CH4 are also the main compounds of biogas. The combustion of which is a source of electricity in combined heat-power cogeneration plant (CHP).Our present efforts are devoted to design a catalytic sensor for biogas analysis. In such a sensor ,both gases have to be activated at room temperature, which has been demonstrated as possible with cobalt based oxide. However, the deposition of the active phase on a silicon support needs a special attention, in order to provide the highest possible surface to increase the number of active site, while offering the guarantee that the active phase won’t be easily removed during the sensor functioninginfo:eu-repo/semantics/nonPublishe

Development of cobalt-based active phase for the detection of methane and carbon dioxide

info:eu-repo/semantics/nonPublishe

Database of the PONDSCAPE project (Towards a sustainable management of pond diversity at the landscape level)

status: publishe

Database of the PONDSCAPE project (Towards a sustainable management of pond diversity at the landscape level)

status: publishe