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Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 13, October-December 1994 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Catalytic Decompostion of Nitric Oxide. Quarterly Technical Progress Report Number 12, July-September, 1994 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 3, April 1992-June 1992 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (683 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide ; Quarterly Technical Progress Report No. 9, October--December 1993 written by and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project investigates a suitable catalyst system for the direct nitric oxide decomposition in post-combustion gas streams. This process does not use a reductant, such as the ammonia used in the Selective Catalytic Reduction (SCR) of NO(subscript x) to nitrogen. Therefore, it is a greatly simplified process basically involving passing the flue gas through a catalytic converter. A systematic study of water vapor effects on the structure and Cu{sup 2+} ion exchange capacity of parent ZSM-5 zeolites and on the catalytic activity of the Cu-ZSM-5 and metal ion (mg{sup 2+} and Ce{sup 3+}) modified Cu-ZSM-5 catalysts for NO decomposition has been performed during this quarter. Mg{sup 2+} and Ce{sup 3+} cocations in copper ion-exchanged ZSM-5 zeolites display a positive effect on the decomposition of nitric oxide to nitrogen and oxygen. The catalytic activity of a Cu-ZSM-5 catalyst was examined after it was exposed to different inert and oxygen-containing gas streams. The results show that the steady-state catalyst activity is not sensitive to three treatments.
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ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (685 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 10, January--March 1994 written by and published by . This book was released on 1994 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project investigates a suitable catalyst system for the direct nitric oxide decomposition in post-combustion gas streams. This process does not use a reductant, such as the ammonia used in the Selective Catalytic Reduction (SCR) of NO(subscript 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 preparation of metal/zeolite catalysts. Particular emphasis is given in this work on promoted Cu-exchanged zeolites, especially the catalyst systems Mg/Cu-ZSM-5 and Ce/Cu-ZSM-5, which are promising for NO conversion to nitrogen at typical flue gas O2 and NO levels and over the temperature range of 673--873°C. The effect of zeolite modification, copper exchange level and catalyst preparation conditions on the catalytic activity are studied in O2-free, O2-rich gases, as well as wet (2--20% H2O) gas streams in a packed-bed microreactor. Characterization of catalysts is performed by XRD, STEM, TEM and ESR. During this quarter it was found that severe steaming (20% H2O) of Na-ZSM-5 at temperatures above 600°C caused partial vitreous glass formation and dealumination. Unpromoted Cu-ZSM-5 catalysts suffer drastic loss of NO decomposition activity in wet gas streams at 500°C. Activity is partially recovered in dry gas. Copper migration out of the zeolite channels leading to CuO formation has been identified by STEM/EDX. In Ce/Cu-ZSM-5 catalysts the wet gas activity i's greatly improved. CuO particle formation is less extensive and the dry gas activity is largely recovered upon removal of the water vapor.
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Total Pages : 806 pages
Book Rating : 4.:/5 (3 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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Total Pages : 14 pages
Book Rating : 4.:/5 (727 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 5, October--December 1992 written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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(subscript 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 preparation of metal/zeolite catalysts. The catalysts of primary interest include copper, palladium, silver, and nickel exchanged ZSM-5 catalysts. Particular emphasis is given in this work on promoted Cu-exchanged zeolites, especially the catalyst system Mg/Cu-ZSM-5 and a few others, which are promising for NO conversion to nitrogen at typical flue gas O2 and NO levels and over the temperature range of 723--873K. Effects of zeolite modification, copper exchange level and catalyst preparation conditions on the catalyst activity are studied in a packed-bed microreactor. Temperature-programmed desorption (TPD) and reduction (TPR) experiments will be carried out in a thermogravimetric analyzer and a single-particle electrodynamic balance (EDB). Kinetic studies of NO and O2 interaction with catalysts over a wide temperature range as well as catalyst structural investigations are planned.
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ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (682 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report Number 11, April--June, 1994 written by and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, effects of Cu-ZSM-5 catalyst preparation on the activity of over-exchanged copper for NO decomposition are reported. The Cu-ZSM-5 catalysts were prepared by incorporating Cu{sup 2+} cations into ZSM-5 zeolites from an aqueous cupric acetate solution adjusted to different pH values by adding either acetic anhydride or aqueous ammonia in the solution. The Cu{sup 2+} exchange levels increased with increasing pH level. STEM/EDX analysis identified CuO particles (5--6 nm) on the zeolite surface for the materials exchanged at pH> 6. Conversion and kinetics measurements of NO decomposition to N2 over these catalysts showed that the over-exchanged copper was not active. Short-time wash with aqueous ammonia removed this copper. The catalyst activity correlated very well with the amount of copper remaining in the ZSM-5 channels.
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ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (727 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 2, January--March 1992 written by and published by . This book was released on 1992 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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(subscript 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, namely high operating cost, ammonia slip, and potential N20 emissions. A brief description of the proposed work is as follows: Catalysts will be prepared by incorporating metal cations into zeolite supports according to ion exchange procedures widely used in preparation of metal/zeolite catalysts. Zeolites will be modified to improve catalytic activity, by blocking ion exchange sites in the small pores of zeolites with promoter cations of high valence. The catalysts of primary interest include copper (Cu), palladium (Pd), platinum (Pt), silver (Ag), and nickel (Ni) exchanged zeolites.
Download or read book Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide. Quarterly Technical Progress Report, October 1, 1994-December 31, 1994 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (685 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 8, July--September 1993 written by and published by . This book was released on 1993 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 N2 and O2 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-exchanged levels in Cu-ZSM-5 catalysts at the same experimental conditions. Cocation promoter effect in metal ion modified Cu-ZSM-5 catalyst is discussed in terms of higher turn over frequency of NO decomposition than that for Cu-ZSM-5 with the same amount of Cu exchange level. Parent ZSM-5 zeolites were dealuminated after they had been treated in a gaseous mixture of 20%H2O-4%O2-He at 750°C for 20 hours. Cu exchange process and BET measurements showed that the dealuminated ZSM-5 materials had only 15% of Cu exchange capacity and negligible micropore volume.
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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (727 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 6, January--March 1993 written by and published by . This book was released on 1993 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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(subscript 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 preparation of metal/zeolite catalysts. The catalysts of primary interest include copper, palladium, silver, and nickel exchanged ZSM-5 catalysts. Particular emphasis is given in this work on promoted Cu-exchanged zeolites, especially the catalyst system Mg/Cu-ZSM-5 and a few others, which are promising for NO conversion to nitrogen at typical flue gas 02 and NO levels and over the temperature range of 723-873K. Effects of zeolite modification, copper exchange level and catalyst preparation conditions on the catalyst activity are studied in a packed-bed microreactor. Temperature-programmed desorption (TPD) and reduction (TPR) experiments will be carried out in a thermogravimetric analyzer and a single-particle electrodynamic balance (EDB). Kinetic studies of NO and 02 interaction with catalysts over a wide temperature range as well as catalyst structural investigations are planned.
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (727 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 4, July--September 1992 written by and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project investigates a suitable catalyst system for direct NO decomposition in post-combustion NO(subscript 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 zeolites, especially the catalyst system Mg/Cu-ZSM-5 and a few others, which are promising for NO conversion to nitrogen at typical flue gas O2 and NO levels and over the temperature range of 723--873K. Effects of zeolite modification, Cu exchange level and catalyst preparation conditions on the catalyst activity are studied in a packed-bed microreactor. Temperature-programmed desorption and reduction experiments will be carried out in a thermogravimetric analyzer and a single-particle electrodynamic balance. Kinetic studies of NO and O2 interaction with catalysts over a wide temperature range as well as catalyst structural investigations are planned.
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ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (727 download)
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Quarterly Technical Progress Report No. 7, April--June 1993 written by and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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(subscript 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 of metal/zeolite catalysts. The catalysts of primary interest include copper, palladium, silver and nickel exchanged ZSM-5 catalysts. Particular emphasis is given in this work on promoted Cu-exchanged zeolites, especially the catalyst system Mg/Cu-ZSM-5 and a few others, which are promising for NO conversion to nitrogen at typical flue gas O2 and NO levels and over the temperature range of 723--873K. The effect of zeolite modification, copper exchange level and catalyst preparation conditions on the catalyst activity are studied in a packed-bed microreactor. Temperature-programmed desorption (TPD) and reduction (TPR) experiments will be carried out in a thermogravimetric analyzer. Kinetic studies of NO and O2 interaction with catalysts over a wide temperature range as well as catalyst structural investigations are planned.
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ISBN 13 :
Total Pages : 1044 pages
Book Rating : 4.X/5 (2 download)
Download or read book Acid Precipitation written by and published by . This book was released on 1994 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Total Pages : 604 pages
Book Rating : 4.3/5 (243 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1995 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Catalytic Decomposition of Nitric Oxide. Final Report written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
