| 摘要 |
The present invention provides a regenerable catalyst composition suitable for entrapping SO<SUB>x</SUB>. The composition of the invention comprises a copper oxide having the formula (Cu/(A oxide) where A oxide is SiO<SUB>2</SUB>, Zr-SiO<SUB>2</SUB>, A1<SUB>2</SUB>O<SUB>3</SUB>, TiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>, ZrO<SUB>2 </SUB>and In<SUB>2</SUB>O<SUB>3 </SUB>or mixtures thereof. Copper loading may vary from about 10 to 60 mol % and is preferably about 25 mol %. The catalyst composition adsorbs SO<SUB>x </SUB>as metal sulfate under lean conditions and desorbs accumulated SO<SUB>x </SUB>as SO<SUB>2 </SUB>under rich conditions. Such reversible SO<SUB>x </SUB>trap are able to operate under conventional NO<SUB>x </SUB>trap operating conditions to prevent sulfur poisoning of the NO<SUB>x </SUB>trap. Furthermore, these traps may be regenerated under rich conditions at 300-450° C. In another embodiment of the present invention, an irreversible SO<SUB>x </SUB>trap capable of collecting SO<SUB>x </SUB>under lean conditions is provided. The traps of this embodiment include praseodymia, zirconia-praseodymia and mixed manganese-yttria and mixtures thereof.
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