Coadsorption of nitriles and CO on Cu-ZSM-5: An in situ FTIR spectroscopic study

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The catalytic opportunity that Cu-ZSM-5 has for potentially reducing NO{sub x} emission through reduction by hydrocarbons has prompted an enormous international examination of this material and the chemical properties it displays. The coadsorption of acetonitrile (ACN) or deuterated acetonitrile (dACN) with CO at Cu-ZSM-5 reveals several interesting features concerning the partial valency of Cu. Specifically, CO binds at Cu{sup +1} and Cu{degree} centers (in the absence of preadsorbed ACN) and exhibits C-O stretching frequencies of 2,157 cm{sup {minus}1} and 2,112 cm{sup {minus}1}, respectively. Carbon monoxide readily adsorbs at an ACN (or dACN) saturated Cu-ZSM-5 and exhibits a C-O stretch of ... continued below

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6 p.

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Szanyi, J. & Paffett, M.T. May 1, 1996.

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Description

The catalytic opportunity that Cu-ZSM-5 has for potentially reducing NO{sub x} emission through reduction by hydrocarbons has prompted an enormous international examination of this material and the chemical properties it displays. The coadsorption of acetonitrile (ACN) or deuterated acetonitrile (dACN) with CO at Cu-ZSM-5 reveals several interesting features concerning the partial valency of Cu. Specifically, CO binds at Cu{sup +1} and Cu{degree} centers (in the absence of preadsorbed ACN) and exhibits C-O stretching frequencies of 2,157 cm{sup {minus}1} and 2,112 cm{sup {minus}1}, respectively. Carbon monoxide readily adsorbs at an ACN (or dACN) saturated Cu-ZSM-5 and exhibits a C-O stretch of 2,122 cm{sup {minus}1}, a value more consistent with a partially reduced Cu{sup +1} center. Furthermore, the IR cross section for the CN stretch in a number of nitriles (ACN, dACN, and benzonitrile) coadsorbed with CO displays interesting effects attributed to rehybridization and changes in CN dipole moment.

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6 p.

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OSTI as DE96009005

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  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996

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  • Other: DE96009005
  • Report No.: LA-UR--96-1239
  • Report No.: CONF-960401--13
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 225967
  • Archival Resource Key: ark:/67531/metadc667400

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  • May 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 29, 2016, 8:38 p.m.

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Szanyi, J. & Paffett, M.T. Coadsorption of nitriles and CO on Cu-ZSM-5: An in situ FTIR spectroscopic study, article, May 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc667400/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.