Davidson, JE
1994
Catalysts for Cleanup of NH3, NOx and CO from a Nuclear Waste Processing Facility
Gopalakrishnan, R.; Davidson, J.E.; Stafford, P.R.; Hecker, W.C. and Bartholomew, C.H.
ACS Symposium Series, 552:74-88, 1994. Funded by Westinghouse Idaho Nuclear Company, Brigham Young University and ACERC.
Performance of Cu-ZSM-5, Pt/Al2O3 and Cu-ZSM-5 + Pt/Al2)3 for NH3 (425-750 ppm) and CO (~1%) oxidation in the presence of NO (250 ppm), O2 (14-15%) and H2O (~20%) was studied as a function of temperature. Pt/Al2O3 is more active for NH3 and CO oxidation, while Cu-ZSM-5 is more selective for conversion of NO and NH3 to N2. NH3 and CO are completely oxidized above 300°C on Pt/Al2O3, while on Cu-ZSM-5 about 99% of NH3 and NO are converted to N2 at 450-500°C, although only about 50% of CO is converted to CO2. The selectivity of Cu-ZSM-5 for conversion of NH3 and NO to N2 is about 100%, while selectivities of Pt/Al2O3 for N2 and N2O are 35-40% and 20-40% respectively. However, the activity and selectivity of a Cu-ZSM-5 + Pt/Al2O3 dual catalytic systems are very high, converting 99% of NH3, 94% of NO, and 100% of CO simultaneously at 485°C with a 100% selectivity to N2.
1993
Selective Catalytic Reduction of Nitric Oxide by Propane in Oxidizing Atmosphere over Copper-Exchanged Zeolites
Gopalakrishnan, R.; Stafford, P.R.; Davidson, J.E.; Hecker, W.C. and Bartholomew, C.H.
Applied Catalysis B: Environmental, 2: 165, 1993. (Presented at the Seventh Annual Symposium of the Western States Catalysis Club, Albuquerque, NM, March 1992; at the American Institute of Chemical Engineers Annual Meeting, Miami Beach, FL, November 1992 and at the 13th North American Meeting of the Catalysis Society, Pittsburgh, PA, May 1993). Funded by Shell, Brigham Young University and Winco.
Selective catalytic reduction of NO with propane and oxygen was investigated on Cu-exchanged ZSM-5, mordenite, X-type and Y-type zeolites at temperatures in the range of 200 to 600º C. Catalytic activities of Cu-X and Cu-Y are negligible, activity of Cu-mordenite moderate, and that of Cu-ZSM-5 very high, converting >90% of NO to N2 at 400ºC and a space velocity of 102,300/hr. Effects of space velocity, NO concentration, C3H8/NO ratio, oxygen concentration, and water vapor on the activities of Cu-ZSM-5 and Cu-mordenite were investigated. NO conversion decreases with increasing space velocity, decreasing propane and NO concentrations, and decreasing propane/NO ratio. Water vapor decreases the activity significantly at all temperatures. At temperatures above 400ºC, propane oxidation by oxygen is a significant competing reaction in decreasing the selectivity for NO reduction. The results indicate that Cu-ZSM-5 is a promising catalyst for SCR of NO by hydrocarbons.
1992
Selective Catalytic Reduction of Nitric Oxide by Propane in Oxidizing Atmosphere Over Copper-Exchanged Zeolites
Gopalakrishnan, R.; Stafford, P.R.; Davidson, J.E.; Hecker, W.C. and Bartholomew, C.H.
Applied Catalysis, 1992 (in press). (Also presented at the Seventh Annual Symposium of the Western States Catalysis Club, Albuquerque, NM, March 1992 and at the American Institute of Chemical Engineers Annual Meeting, Miami Beach, FL, November 1992). Funded by Shell and Brigham Young University.
Selective catalytic reduction of NO with propane and oxygen was investigated on Cu-exchanged ZSM-5, mordenite, X-type and Y-type zeolites at temperatures in the range of 200 to 600ºC. Catalytic activities of Cu-X and Cu-Y are negligible, activity of Cu-mordenite moderate, and that of Cu-ZSM-5 very high, converting >90% of NO to N2 at 400ºC and at a space velocity of 102,300/hr. Effects of space velocity, NO concentration, C3H8/NO ratio, oxygen concentration, and water vapor on the activities of Cu-ZSM-5 and Cu-mordenite were investigated. NO conversion decreases with increasing space velocity, decreasing propane and NO concentrations, and decreasing propane/NO ratio. Water vapor decreases the activity significantly at all temperatures. At temperatures above 400ºC, propane oxidation by oxygen is a significant competing reaction in decreasing the selectivity for NO reduction. The results indicate that Cu-ZSM-5 is a promising catalyst for SCR of NO by hydrocarbons.
Davidson, JE
1994
Catalysts for Cleanup of NH3, NOx and CO from a Nuclear Waste Processing Facility
Gopalakrishnan, R.; Davidson, J.E.; Stafford, P.R.; Hecker, W.C. and Bartholomew, C.H.
ACS Symposium Series, 552:74-88, 1994. Funded by Westinghouse Idaho Nuclear Company, Brigham Young University and ACERC.
Performance of Cu-ZSM-5, Pt/Al2O3 and Cu-ZSM-5 + Pt/Al2)3 for NH3 (425-750 ppm) and CO (~1%) oxidation in the presence of NO (250 ppm), O2 (14-15%) and H2O (~20%) was studied as a function of temperature. Pt/Al2O3 is more active for NH3 and CO oxidation, while Cu-ZSM-5 is more selective for conversion of NO and NH3 to N2. NH3 and CO are completely oxidized above 300°C on Pt/Al2O3, while on Cu-ZSM-5 about 99% of NH3 and NO are converted to N2 at 450-500°C, although only about 50% of CO is converted to CO2. The selectivity of Cu-ZSM-5 for conversion of NH3 and NO to N2 is about 100%, while selectivities of Pt/Al2O3 for N2 and N2O are 35-40% and 20-40% respectively. However, the activity and selectivity of a Cu-ZSM-5 + Pt/Al2O3 dual catalytic systems are very high, converting 99% of NH3, 94% of NO, and 100% of CO simultaneously at 485°C with a 100% selectivity to N2.
1993
Selective Catalytic Reduction of Nitric Oxide by Propane in Oxidizing Atmosphere over Copper-Exchanged Zeolites
Gopalakrishnan, R.; Stafford, P.R.; Davidson, J.E.; Hecker, W.C. and Bartholomew, C.H.
Applied Catalysis B: Environmental, 2: 165, 1993. (Presented at the Seventh Annual Symposium of the Western States Catalysis Club, Albuquerque, NM, March 1992; at the American Institute of Chemical Engineers Annual Meeting, Miami Beach, FL, November 1992 and at the 13th North American Meeting of the Catalysis Society, Pittsburgh, PA, May 1993). Funded by Shell, Brigham Young University and Winco.
Selective catalytic reduction of NO with propane and oxygen was investigated on Cu-exchanged ZSM-5, mordenite, X-type and Y-type zeolites at temperatures in the range of 200 to 600º C. Catalytic activities of Cu-X and Cu-Y are negligible, activity of Cu-mordenite moderate, and that of Cu-ZSM-5 very high, converting >90% of NO to N2 at 400ºC and a space velocity of 102,300/hr. Effects of space velocity, NO concentration, C3H8/NO ratio, oxygen concentration, and water vapor on the activities of Cu-ZSM-5 and Cu-mordenite were investigated. NO conversion decreases with increasing space velocity, decreasing propane and NO concentrations, and decreasing propane/NO ratio. Water vapor decreases the activity significantly at all temperatures. At temperatures above 400ºC, propane oxidation by oxygen is a significant competing reaction in decreasing the selectivity for NO reduction. The results indicate that Cu-ZSM-5 is a promising catalyst for SCR of NO by hydrocarbons.
1992
Selective Catalytic Reduction of Nitric Oxide by Propane in Oxidizing Atmosphere Over Copper-Exchanged Zeolites
Gopalakrishnan, R.; Stafford, P.R.; Davidson, J.E.; Hecker, W.C. and Bartholomew, C.H.
Applied Catalysis, 1992 (in press). (Also presented at the Seventh Annual Symposium of the Western States Catalysis Club, Albuquerque, NM, March 1992 and at the American Institute of Chemical Engineers Annual Meeting, Miami Beach, FL, November 1992). Funded by Shell and Brigham Young University.
Selective catalytic reduction of NO with propane and oxygen was investigated on Cu-exchanged ZSM-5, mordenite, X-type and Y-type zeolites at temperatures in the range of 200 to 600ºC. Catalytic activities of Cu-X and Cu-Y are negligible, activity of Cu-mordenite moderate, and that of Cu-ZSM-5 very high, converting >90% of NO to N2 at 400ºC and at a space velocity of 102,300/hr. Effects of space velocity, NO concentration, C3H8/NO ratio, oxygen concentration, and water vapor on the activities of Cu-ZSM-5 and Cu-mordenite were investigated. NO conversion decreases with increasing space velocity, decreasing propane and NO concentrations, and decreasing propane/NO ratio. Water vapor decreases the activity significantly at all temperatures. At temperatures above 400ºC, propane oxidation by oxygen is a significant competing reaction in decreasing the selectivity for NO reduction. The results indicate that Cu-ZSM-5 is a promising catalyst for SCR of NO by hydrocarbons.