Direct catalytic decomposition of nitric oxide. Final report

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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, ammonia slip, and potential N{sub 2}O emissions. The main results from this research project are summarized in the following: Cu-ZSM-5 and M/Cu-ZSM-5 were synthesized by incorporating ... continued below

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67 p.

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Flytzani-Stephanopoulos, M.; Sarofim, A. F. & Zhang, Yanping June 15, 1995.

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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, ammonia slip, and potential N{sub 2}O emissions. The main results from this research project are summarized in the following: Cu-ZSM-5 and M/Cu-ZSM-5 were synthesized by incorporating metal cations into ZSM-5 zeolite supports by optimized ion exchange procedures. It was found that (1) the catalytic activity of Cu-ZSM-5 only increased with copper loading when the Cu-ZSM-5 was prepared in an aqueous copper acetate solution with pH lower than 5.74; (2) high pH of the solution led not only to ion-exchanged Cu{sup 2+}, but also copper deposition on the zeolite surface forming inactive CuO particles as identified by STEM/EDX and XRD; (3) the sequence of metal ion exchange first, followed by copper ion exchange to synthesize M/Cu-ZSM-5, where M represents any metal ion but copper, was important for the cocation to show promotion effects; and (4) air-calcination of M-ZSM was effective in keeping M cations in the zeolite during subsequent copper ion exchange. Positive alkaline and rare earth metal cocation effects on the Cu-ZSM-5 were identified in oxygen-containing gas mixtures in the high temperature region (450--600C). Cerium ion promoted the Cu-ZSM-5 activity in the low temperature range (< 450C) in oxygen-free gas mixture, while alkaline earth and transition metal cocations improved the NO conversion to N{sub 2} in high temperature region.

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67 p.

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OSTI as DE95017760

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  • Other Information: PBD: 15 Jun 1995

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  • Other: DE95017760
  • Report No.: DOE/PC/91293--T5
  • Grant Number: FG22-91PC91293
  • DOI: 10.2172/111932 | External Link
  • Office of Scientific & Technical Information Report Number: 111932
  • Archival Resource Key: ark:/67531/metadc624534

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  • June 15, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • March 22, 2018, 3:07 p.m.

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Flytzani-Stephanopoulos, M.; Sarofim, A. F. & Zhang, Yanping. Direct catalytic decomposition of nitric oxide. Final report, report, June 15, 1995; Cambridge, Massachusetts. (digital.library.unt.edu/ark:/67531/metadc624534/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.