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AssigneeBASF SE
InventorsIvor Bull, Wen-Mei Xue, Patrick Burk, R. Samuel Boorse, William M. Jaglowski, Gerald S. Koermer, Ahmad Moini, Joseph A. Patchett, Joseph C. Dettling, Matthew T. Caudle
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Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to aluminum ratio from about 0.25:1 to about 1:1.
A process for the reduction of oxides of nitrogen contained in a gas stream in the presence of oxygen wherein said process comprises contacting the gas stream with a catalyst comprising a zeolite having the CHA crystal structure and a mole ratio of silica to alumina from about 15 to about 100 and an atomic ratio of copper to aluminum from about 0.25 to about 0.50.
A process for the reduction of oxides of nitrogen contained in a gas stream in the presence of oxygen wherein said process comprises adding a reductant to the gas stream and contacting the gas stream containing the reductant with a catalyst comprising a zeolite having the CHA crystal structure and a mole ratio of silica to alumina from about 15 to about 150 and an atomic ratio of copper to aluminum from about 0.25 to about 1.
Dependencies are inferred from the claim text.