The Impurities contain Zinc will affect the NITROGEN OXIDES EMISSIONS (METHOD 7E)

Question

Dear all,
The data from NO2 to NO Conversion Efficiency Test is about 75%, lower than the regulations 90%. we check the Particulate Filter, some  Impurities contain Zinc. Could some offer us the references to explain the lower value, thank all.

Hans Zijlstra · Answer

https://www.researchgate.net/publication/228546834_Reaction_of_NO2_with_Zn_and_ZnO_Photoemission_XANES_and_density_functional_studies_on_the_formation_of_NO3

Water Network Research · Answer

Answer from Chat GPT:  To achieve a higher conversion of nitrogen dioxide (NO2) to nitrogen monoxide (NO) at 90% instead of 75%, and to increase the removal of zinc from the residue, you may consider the following suggestions:
Optimize Reaction Conditions: Review and optimize the reaction conditions, such as temperature, pressure, and residence time. Increasing the temperature and adjusting other parameters can enhance the reaction rate and improve the conversion.
Catalyst Selection: Evaluate different catalysts or catalyst formulations to enhance the conversion efficiency. Catalysts can facilitate the conversion of NO2 to NO and potentially aid in the removal of zinc. Experiment with different catalyst materials, including supported metal catalysts, to find the most effective option.
Increase Reactant Concentration: Increasing the concentration of the reactants, especially the concentration of NO2, can lead to higher conversion rates. However, be mindful of safety considerations and ensure that the reaction remains within controllable parameters.
Improve Reactor Design: Optimize the reactor design to enhance the contact between the reactants and catalyst. This could involve modifying the reactor geometry, introducing additional mixing mechanisms, or using catalyst supports with higher surface areas to increase the reaction efficiency.
Gas Recycling: Consider implementing a gas recycling system that allows unreacted gases to be recycled back into the reactor. This can increase the overall conversion by providing more opportunities for reaction.
Removal of Zinc: If you are looking to remove zinc from the residue, you may need to incorporate additional separation or purification steps. Explore techniques such as filtration, precipitation, or extraction to isolate or recover the zinc from the residue.
It's important to note that the specific details of the process, such as the reaction conditions, catalyst, and reactor design, will depend on the specific industrial setup and the requirements of your application. Consulting with experts in the field or conducting laboratory-scale experiments can provide further guidance and insight into achieving higher conversion and zinc removal.
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