Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Reexamination Certificate
2007-11-06
2007-11-06
Lorengo, J. A. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
C502S302000, C502S345000, C502S349000, C502S324000, C029S890000, C422S168000
Reexamination Certificate
active
10748594
ABSTRACT:
The present invention provides a regenerable catalyst composition suitable for entrapping SOx. The composition of the invention comprises a copper oxide having the formula (Cu/(A oxide) where A oxide is SiO2, Zr—SiO2, Al2O3, TiO2—Al2O3, ZrO2and In2O3or mixtures thereof. Copper loading may vary from about 10 to 60 mol % and is preferably about 25 mol %. The catalyst composition adsorbs SOxas metal sulfate under lean conditions and desorbs accumulated SOxas SO2under rich conditions. Such reversible SOxtrap are able to operate under conventional NOxtrap operating conditions to prevent sulfur poisoning of the NOxtrap. Furthermore, these traps may be regenerated under rich conditions at 300-450° C. In another embodiment of the present invention, an irreversible SOxtrap capable of collecting SOxunder lean conditions is provided. The traps of this embodiment include praseodymia, zirconia-praseodymia and mixed manganese-yttria and mixtures thereof.
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Carberry Brendan
Chigapov Albert
Chun Woosang
Dubkov Alexei
Graham George
Brooks & Kushman P.C.
Ford Global Technologies LLC
Hailey Patricia L.
Lorengo J. A.
Porcari Damian
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