Structure sensitivities of SAPO zeolites on catalytic oxidation of nitric oxide

Zhanquan Zhang, John D. Atkinson, Hao Song, Mark J. Rood, Zifeng Yan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

NOx emissions from increasing coal consumption associated with ozone depletion, photochemical smog, acid rain, ambient particulate matter and respiratory diseases has triggered global interest in exploring new catalysts and technologies for NOx abatement. Catalytic NO oxidation combined with subsequent liquid absorption is a possible alternative to current selective catalytic and non-catalytic reduction. Compared to existing abatement strategies, NO oxidation operates at a lower temperature (< 100°C) and can potentially be used for simultaneous control of multiple pollutants. Porous zeolites including SAPO-11 and SAPO-34 as NO oxidation catalysts were investigated. The bench-scale reactor used 2.4 x l04 mL/g-hr, 0.25 g of packed zeolite catalyst, 25 °C, 50 °C, and inlet gases of 380 ppmv NO, 10 vol % O2, and balance N2. At 25 °C, higher conversion efficiency (39.78 ∓ 0.48%) was achieved on SAPO-34 than on SAPO-11 (7.85 ∓ 0.3 3%). At 50°C the conversion efficiency for SAPO-34 was 16.2 ∓ 0.7%, higher than 3.9 ∓ 0.4%. Transient kinetic experiments combined with tests investigating the impacts of pre-sorbed NOx species showed that the NO oxidation mechanism over zeolite catalysts was consistent with the carbon-catalyzed process. Conversion efficiency of the catalyst was controlled by the catalyst's pore structure, including cavity size and channels. The pore width must be large enough to adsorb NO and formed intermediates, but narrow enough to provide the necessary energy benefits associated with increased adsorption in micropores. This is an abstract of a paper presented at the 106th AWMA Annual Conference and Exhibition (Chicago, IL 6/25-28/2013).

Original languageEnglish (US)
Title of host publication106th Air and Waste Management Association Annual Conference and Exhibition, ACE 2013
PublisherAir and Waste Management Association
Pages153-165
Number of pages13
ISBN (Print)9781629934440
StatePublished - Jan 1 2012
Event106th Air and Waste Management Association Annual Conference and Exhibition, ACE 2013 - Chicago, IL, United States
Duration: Jun 25 2013Jun 28 2013

Publication series

NameProceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA
Volume1
ISSN (Print)1052-6102

Other

Other106th Air and Waste Management Association Annual Conference and Exhibition, ACE 2013
Country/TerritoryUnited States
CityChicago, IL
Period6/25/136/28/13

Keywords

  • NO oxidation
  • SAPO-11
  • SAPO-34
  • Zeolites

ASJC Scopus subject areas

  • Environmental Science(all)
  • Energy(all)

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