Journal
CHEMSUSCHEM
Volume 6, Issue 8, Pages 1467-1477Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201300215
Keywords
cold start conditions; honeycomb monoliths; hydrocarbons; thin films; zeolites
Funding
- Ministerio de Economia y Competitividad
- FEDER [CTQ2012/31762, PROMETEO/2009/047]
- Generalitat Valenciana
- University of Alicante
- Ministry of Education of Spain [AP2009-3544]
- MICYT [RYC-2009-04483]
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A high percentage of hydrocarbon (HC) emissions from gasoline vehicles occur during the cold-start period. Among the alternatives proposed to reduce these HC emissions, the use of zeolites before the three-way catalyst (TWC) is thought to be very effective. Zeolites are the preferred adsorbents for this application; however, to avoid high pressure drops, supported zeolites are needed. In this work, two coating methods (dip-coating and insitu crystallization) are optimized to prepare BETA zeolite thin films supported on honeycomb monoliths with tunable properties. The important effect of the density of the thin film in the final performance as a HC trap is demonstrated. A highly effective HC trap is prepared showing 100% toluene retention, accomplishing the desired performance as a HC trap, desorbing propene at temperatures close to 300 degrees C, and remaining stable after cycling. The use of this material before the TWC is very promising, and works towards achieving the sustainability and environmental protection goals.
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