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Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 7, April--June 1993

Description: This project investigates a suitable catalyst system for direct NO decomposition in post-combustion gas streams. This process does not use a reductant, such as the ammonia used in Selective Catalytic Reduction (SCR) of NO{sub x} to nitrogen. Therefore, it is greatly simplified process basically involving passing the flue gas through a catalytic converter. Catalysts are prepared by incorporating metal cations into zeolite supports according to ion exchange procedures widely used in preparation o… more
Date: September 1, 1993
Creator: Flytzani-Stephanopoulos, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cross-flow, filter-sorbent catalyst for particulate, SO sub 2 and NO sub x control

Description: This report describes work performed on a new concept for integrated pollutant control: a cross-flow filter comprised of layered, gas permeable membranes that act as a particle filter, an SO {sub 2} sorbent, and a NO {sub x} reduction catalyst. One critical element of the R D program is the development of mixed metal oxide materials that serve as combined SO {sub 2} sorbents and NO {sub x} reduction catalysts. In this seventh quarterly progress report, we summarize the performance characteristi… more
Date: January 1, 1992
Creator: Benedek, K. & Flytzani-Stephanopoulos, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cross-flow, filter-sorbent catalyst for particulate, SO{sub 2} and NO{sub x} control. Sixth quarterly technical progress report

Description: This report describes a new concept for integrated pollutant control: a cross-flow filter comprised of layered, gas permeable membranes that act a particulate filter, an SO{sub 2} sorbent, and a NO{sub x} reduction catalyst.
Date: August 1, 1991
Creator: Benedek, K. & Flytzani-Stephanopoulos, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cross-flow, filter-sorbent catalyst for particulate, SO{sub 2} and NO{sub x} control. Seventh quarterly technical progress report

Description: This report describes work performed on a new concept for integrated pollutant control: a cross-flow filter comprised of layered, gas permeable membranes that act as a particle filter, an SO {sub 2} sorbent, and a NO {sub x} reduction catalyst. One critical element of the R&D program is the development of mixed metal oxide materials that serve as combined SO {sub 2} sorbents and NO {sub x} reduction catalysts. In this seventh quarterly progress report, we summarize the performance characteristi… more
Date: January 1, 1992
Creator: Benedek, K. & Flytzani-Stephanopoulos, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cross-flow, filter-sorbent-catalyst for particulate, SO{sub 2} and NO{sub x} control. Final report

Description: This report describes work performed on a new concept for integrated pollutant control: An active filter comprised of layered, gas permeable membranes that act as a particle filter, an SO{sub 2} sorbent, and a NO{sub x}, reduction catalyst. The focus of the research program documented in this final report is the development of the sorbent/catalyst materials that are the basis of such an emission control system. The device investigated in this program will simultaneously remove particulates, SO{… more
Date: May 1, 1994
Creator: Benedek, K. & Flytzani-Stephanopoulos, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced byproduct recovery: Direct catalytic reduction of SO{sub 2} to elemental sulfur. First quarterly technical progress report, [October--December 1995]

Description: The team of Arthur D. Little, Tufts University and Engelhard Corporation will be conducting Phase I of a four and a half year, two-phase effort to develop and scale-up an advanced byproduct recovery technology that is a direct, single-stage, catalytic process for converting sulfur dioxide to elemental sulfur. this catalytic process reduces SO{sub 2} over a fluorite-type oxide (such as ceria or zirconia). The catalytic activity can be significantly promoted by active transition metals, such as c… more
Date: February 1, 1996
Creator: Benedek, K. & Flytzani-Stephanopoulos, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanistic and kinetic studies of high-temperature coal gas desulfurization sorbents

Description: The overall objective of this project was to investigate the properties of and evaluate mixed oxides of zinc and titanium for hot fuel gas desulfurization. Uncombined ZnO was also investigated as a base case. Detailed investigation of the reduction and sulfidation reactions of Zn-Ti-O sorbents was performed. The intrinsic kinetics and the product layer diffusion rates in reduction and sulfidation were determined. Kinetic experiments with sorbents containing various Zn/Ti atomic ratios were perf… more
Date: October 1, 1991
Creator: Lew, S.; Flytzani-Stephanopoulos, M. & Sarofim, A. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selective catalytic reduction of sulfur dioxide to elemental sulfur

Description: Elemental sulfur recovery from SO[sub 2]-containing gas streams is highly attractive as it produces a saleable. Product and no waste to dispose of. However, commercially available schemes are complex and involve multi-stage reactors, such as, most notably in the Resox (reduction of SO[sub 2] with coke) and Claus plants(reaction of SO[sub 2] with H[sub 2]S over catalyst). This project win investigate a cerium oxide catalyst for the single-stage selective reduction SO[sub 2] to elemental sulfur b… more
Date: January 1, 1992
Creator: Liu, Wei; Flytzani-Stephanopoulos, M. & Sarofim, A.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of novel copper-based sorbents for hot-gas cleanup. Final technical report, 1 September 1992--31 August, 1993

Description: The objective of this investigation is to evaluate two novel copper-based sorbents, namely Cu-Cr and Cu-Ce, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650 to 850 C. Such high temperatures will be required for the new generation of gas turbines in Integrated Gasification Combined Cycle systems. Structural and kinetic studies were conducted on various compositions of the two Cu-based sorbents to determine the optimum sorbent composition. The eff… more
Date: December 31, 1993
Creator: Hill, A. H.; Abbasian, J. & Flytzani-Stephanopoulos, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selective catalytic reduction of sulfur dioxide to elemental sulfur. Quarterly technical progress report No. 2, October--December 1992

Description: Elemental sulfur recovery from SO{sub 2}-containing gas streams is highly attractive as it produces a saleable. Product and no waste to dispose of. However, commercially available schemes are complex and involve multi-stage reactors, such as, most notably in the Resox (reduction of SO{sub 2} with coke) and Claus plants(reaction of SO{sub 2} with H{sub 2}S over catalyst). This project win investigate a cerium oxide catalyst for the single-stage selective reduction SO{sub 2} to elemental sulfur b… more
Date: December 31, 1992
Creator: Liu, Wei; Flytzani-Stephanopoulos, M. & Sarofim, A. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 2, January--March 1992

Description: This project will investigate a suitable catalyst system for the direct NO decomposition, for post-combustion NO. control. The proposed process will not use a reductant, such as ammonia in case of Selective Catalytic Reduction (SCR) process for catalytic reduction of NO{sub x} to nitrogen. This is a simplified process basically involving passing the flue gas through a catalytic converter, thus avoiding problems generally associated with the commercial Selective Catalytic Reduction (SCR) process… more
Date: August 1, 1992
Creator: Flytzani-Stephanopoulos, M.; Sarofim, A. F. & Zhang, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 6, January--March 1993

Description: This project investigates a suitable catalyst system for the direct NO decomposition in post-combustion gas. streams. The process does not use a reductant, such as the ammonia used in Selective Catalytic Reduction (SCR) of NO{sub x} to nitrogen. Therefore, it is a greatly simplified process basically involving passing the flue gas through a catalytic converter. Catalysts are prepared by incorporating metal cations into zeolite supports according to ion exchange procedures widely used in prepara… more
Date: July 1, 1993
Creator: Flytzani-Stephanopoulos, M.; Sarofim, A. F. & Zhang, Yanping
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selective catalytic reduction of sulfur dioxide to elemental sulfur. Quarterly technical progress report No. 6, October--December 1993

Description: Elemental sulfur recovery from SO{sub 2}-containing gas stream is highly attractive as it produces a salable product and no waste to dispose of. However, commercially available schemes are complex and involve multi-stage reactors, such as, most notably in the Resox (reduction of SO{sub 2} with coke) and Claus plant (reaction of SO{sub 2} with H{sub 2}S over catalyst). This project will investigate a cerium oxide catalyst for the single stage selective reduction of SO{sub 2} to elemental sulfur … more
Date: December 31, 1993
Creator: Liu, W.; Flytzani-Stephanopoulos, M. & Sarofim, A. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selective catalytic reduction of sulfur dioxide to elemental sulfur. Quarterly technical progress report No. 6, October 1993--December 1993

Description: Elemental sulfur recovery from SO{sub 2}-containing gas stream is highly attractive as it produces a salable product and no waste to dispose of. However, commercially available schemes are complex and involve multi-stage reactors, such as, most notably in the Resox (reduction of SO{sub 2} with coke) and Claus plant (reaction of SO{sub 2} with H{sub 2}S over catalyst). This project will investigate a cerium oxide catalyst for the single stage selective reduction of SO{sub 2} to elemental sulfur … more
Date: January 1, 1996
Creator: Liu, W.; Flytzani-Stephanopoulos, M. & Sarofim, A. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 4, July--September 1992

Description: This project investigates a suitable catalyst system for direct NO decomposition in post-combustion NO{sub x} control. Since the process does not use a reductant, it is a greatly simplified process basically involving passing the flue gas through a catalytic converter. Catalysts are prepared by incorporating metal cations into zeolite supports by ion exchange. Catalysts of primary interest include Cu, Pd, Ag, and Ni exchanged zeolites. Particular emphasis is given on promoted Cu-exchanged zeoli… more
Date: December 31, 1992
Creator: Flytzani-Stephanopoulos, M.; Sarofim, A. F. & Zhang, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanistic and kinetic studies of high-temperature coal gas desulfurization sorbents. Final report, July 1988--July 1991

Description: The overall objective of this project was to investigate the properties of and evaluate mixed oxides of zinc and titanium for hot fuel gas desulfurization. Uncombined ZnO was also investigated as a base case. Detailed investigation of the reduction and sulfidation reactions of Zn-Ti-O sorbents was performed. The intrinsic kinetics and the product layer diffusion rates in reduction and sulfidation were determined. Kinetic experiments with sorbents containing various Zn/Ti atomic ratios were perf… more
Date: October 1, 1991
Creator: Lew, S.; Flytzani-Stephanopoulos, M. & Sarofim, A. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 8, July--September 1993

Description: Six Cu-ZSM-5 catalysts with different Cu exchange levels were prepared according to our earlier reports. Experimental tests have suggested that the active sites of Cu-ZSM-5 catalysts for nitric oxide decomposition are square planar four-coordinated Cu{sup 2+} cations. Conversion of NO into N{sub 2} and O{sub 2} increases linearly with the amount of square planar four-coordinated Cu{sup 2+}, and the turn over frequency of the NO decomposition over the catalysts is not sensitive to total Cu ion-e… more
Date: December 31, 1993
Creator: Flytzani-Stephanopoulos, M.; Sarofim, A. F. & Zhang, Yanping
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selective catalytic reduction of sulfur dioxide to elemental sulfur. Quarterly technical progress report No. 10, October 1994--December 1994

Description: Elemental sulfur recovery from SO{sub 2}-containing gas stream is highly attractive as it produces a salable product and no waste. However, commercially available schemes are complex and involve multi-stage reactors, such as, most notably in the Resox (reduction of SO{sub 2} with coke) and Claus plant (reaction of SO{sub 2} with H{sub 2}S over catalyst). This project will investigate a cerium oxide catalyst for the single stage selective reduction of SO{sub 2} to elemental sulfur by a reductant… more
Date: March 1, 1995
Creator: Liu, W.; Flytzani-Stephanopoulos, M. & Sarofim, A. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Direct catalytic decomposition of nitric oxide. Final report

Description: This project investigated a suitable catalyst system for the direct NO decomposition for post-combustion NO{sub x} control. The studied process does not use a reductant, such as ammonia in the case of Selective Catalytic Reduction (SCR) process for catalytic reduction of NO{sub x} to nitrogen. This is a simplified process basically involving passing the flue gas through a catalytic converter, thus avoiding problems generally associated with the commercial SCR process, namely high operating cost… more
Date: June 15, 1995
Creator: Flytzani-Stephanopoulos, M.; Sarofim, A. F. & Zhang, Yanping
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selective catalytic reduction of sulfur dioxide to elemental sulfur. Final report

Description: This project has investigated new metal oxide catalysts for the single stage selective reduction of SO{sub 2} to elemental sulfur by a reductant, such as CO. Significant progress in catalyst development has been made during the course of the project. We have found that fluorite oxides, CeO{sub 2} and ZrO{sub 2}, and rare earth zirconates such as Gd{sub 2}Zr{sub 2}O{sub 7} are active and stable catalysts for reduction Of SO{sub 2} by CO. More than 95% sulfur yield was achieved at reaction temper… more
Date: June 1, 1995
Creator: Liu, W.; Flytzani-Stephanopoulos, M. & Sarofim, A.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of novel copper-based sorbents for hot-gas cleanup. [Quarterly] technical report, December 1, 1993--February 28, 1994

Description: The objective of this investigation is to evaluate two novel copper-based sorbents, namely copper-chromium and copper-cerium, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650{degree} to 850{degree}. Such high temperatures will be required for the new generation of gas turbines (inlet >750{degree}C) in Integrated Gasification Combined Cycle (IGCC) systems. The effect of pre-reduction with H{sub 2}, in the presence of H{sub 2}O on the performance … more
Date: June 1, 1994
Creator: Abbasian, J.; Hill, A. H.; Flytzani-Stephanopoulos, M. & Li, Zhijiang
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of novel copper-based sorbents for hot-gas cleanup. [Quarterly] technical report, September 1--November 30, 1993

Description: The objective of this investigation is to evaluate two novel copper-based sorbents, namely copper-chromium and copper-cerium, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650{degree} to 850{degree}C. Such high temperatures will be required for the new generation of gas turbines (inlet >750{degree}C) in Integrated Gasification Combined Cycle (IGCC) systems. The effect of pre-reduction on the performance of the sorbents as well as the rate of diff… more
Date: March 1, 1994
Creator: Abbasian, J.; Hill, A. H.; Flytzani-Stephanopoulos, M. & Li Li
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of novel copper-based sorbents for hot-gas cleanup. [Quarterly] technical report, March 1, 1993--May 31, 1993

Description: The objective of this investigation is to evaluate two novel copper-based sorbents (i.e. copper-chromium and copper-cerium) for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650{degrees} to 850{degrees}C. In this program, structural and kinetic studies are conducted on various compositions of the two selected copper-based sorbents to determine the optimum sorbent composition. The effect of operating conditions on the performance of the sorbents alone… more
Date: September 1, 1993
Creator: Hill, A. H.; Abbasian, J.; Flytzani-Stephanopoulos, M. & Li, Li
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of novel copper-based sorbents for hot-gas cleanup. Technical report, 1 March--31 May 1994

Description: The objective of this investigation is to evaluate two novel copper-based sorbents, namely copper-chromium and copper-cerium, for their effectiveness in removing hydrogen sulfide from fuel gas in the temperature range of 650 to 850 C. Such high temperatures will be required for the new generation of gas turbines (inlet > 750 C) in Integrated Gasification Combined Cycle (IGCC) systems. Results of fixed-bed reactor tests conducted in this quarter, indicate that, at 750 C, pre-reduction with H{sub… more
Date: September 1, 1994
Creator: Abbasian, J.; Hill, A. H.; Flytzani-Stephanopoulos, M. & Li, Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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