Method of controlling NOx gas emission by hydrogen peroxide
US6475373B1 · kind B1 · utility
1Cited by
10References
8Claims
0Family size
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Key dates
| Filing date | Apr 4, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Apr 4, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Emission of NOx during acid-piclding treatment of metals in an aqueous solution containing at least nitric acid is controlled by the addition of hydrogen peroxide. The addition amount of hydrogen peroxide is minimized to avoid excessive addition by monitoring the potentiostatic electrolytic current of the solution or by combinedly monitoring the potentiostatic electrolytic current and the redox potential of the solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.