Friday, November 4, 2022 3:30pm to 4:30pm
About this Event
1301 Memorial Dr, Coral Gables, FL 33146#chemistry
Prof. Carl Hoff will be holding an in-person only seminar titled ”Methods for Oxidizing a Nitrogen Oxide to Nitrate” on Friday, November 4th at 3:30 PM in Cox Science Room 318.
Nitrous oxide, O=N=N, is isostructural with O=C=O. They are both greenhouse gases, but due in part to its longer atmospheric lifetime, nitrous oxide is 300 times worse as a pollutant. It’s removal as a pollutant is not mandated. That removal is most often done, as in the BASF deNOx process by high temperature decomposition over a proprietary Pt catalyst. It removes N2O but does not produce a useful product from what is in fact a high energy valuable chemical.
It is not easy to derivatize nitrous oxide to a useful product. On January 15, 2021 the first successful oxidation of nitrous oxide to nitrate was discovered by us as shown in eqn. (1) (ACS Omega 2021, 6, 28, 18248–18252)
5 N2O + Na2O + 2 KCl → 2NaCl + 2 KNO3+ 4N2 (1)
The initial yields of nitrate were low-on the order of ≈ 20%. Since that time considerable progress has been made. It seems possible that this work may ultimately be developed into a commercial process. On October 20, 2022 a PCT patent application was published PCT/US22/25003. The simple reaction shown in eqn. (1) is considerably more complicated than it would appear. It occurs at room temperature and low pressure in a mixer mill. Additional potentially catalytic materials are added to the reaction. Our current understanding of the reaction will be discussed. Support by the Department of Energy DOE-BE-SDE-SC0019456 and KONOX-LLC is gratefully acknowledged.
Your attendance is greatly appreciated!
Thank you and have a great day!
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