The selective catalytic reduction of NOx over Ag/Al2O3 with isobutanol as the reductant

Brookshear, Daniel William; Pihl, Josh A.; Toops, Todd J.; West, Brian H.; Prikhodko, Vitaly Y.

doi:10.1016/j.cattod.2016.01.034

Title: The selective catalytic reduction of NO_x over Ag/Al₂O₃ with isobutanol as the reductant

Journal Article · Sat Feb 13 00:00:00 EST 2016 · Catalysis Today

DOI:https://doi.org/10.1016/j.cattod.2016.01.034· OSTI ID:1250408

Brookshear, Daniel William ^[1]; Pihl, Josh A. ^[1]; Toops, Todd J. ^[1]; West, Brian H. ^[1]; Prikhodko, Vitaly Y. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, this study investigates the potential of isobutanol (iBuOH) as a reductant for the selective catalytic reduction (SCR) of NO_x over 2 wt% Ag/Al₂O₃ between 150 and 550 °C and gas hourly space velocities (GHSV) between 10,000 and 35,000 h^-1. The feed gas consists of 500 ppm NO, 5% H₂O, 10% O₂, and 375-1500 ppm iBuOH (C₁:N ratios of 3-12); additionally, blends of 24 and 48% iBuOH in gasoline are evaluated. Over 90% NO_x conversion is achieved between 300 and 400 C using pure iBuOH, including a 40% peak selectivity towards NH₃ that could be utilized in a dual HC/NH₃ SCR configuration. The iBuOH/gasoline blends are only able to achieve greater than 90% NOx conversion when operated at a GHSV of 10,000 h^-1 and employing a C₁:N ratio of 12. Iso-butyraldehyde and NO₂ appear to function as intermediates in the iBuOH-SCR mechanism, which mirrors the mechanism observed for EtOH-SCR. In general, the performance of iBuOH in the SCR of NO_x over a Ag/Al₂O₃ catalyst is comparable with that of EtOH, although EtOH/gasoline blends display higher NO_x reduction than iBuOH/gasoline blends. The key parameter in employing alcohols in SCR appears to be the C-OH:N ratio rather than the C₁:N ratio.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1250408

Alternate ID(s):: OSTI ID: 1358899

Journal Information:: Catalysis Today, Vol. 267; ISSN 0920-5861

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Title: The selective catalytic reduction of NOx over Ag/Al2O3 with isobutanol as the reductant

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Title: The selective catalytic reduction of NO_x over Ag/Al₂O₃ with isobutanol as the reductant