The use Na, Li, K cations for modification of ZSM-5 zewolite to control hydrocarbon cold-start emission

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This paper addresses the problem of controlling hydrocarbon emissions from cold-start of engines by investigating the adsorbents which could adsorb the hydrocarbons at cold temperatures and hold them to 250-300 ?. The materials, that has been studied, are based on the modification of ZSM-5 (SiO{sub 2}/Al{sub 2}O{sub 3} = 35) zeolite with Li, K, Na cations. It has been shown that the introduction of Li, Na and K in an amount that is equivalent to the content of Al in zeolite results in occurrence of toluene temperature desorption peaks at high-temperatures. The toluene temperature desorption curves for 5%Li-ZSM-5 and 2.3%Na-ZSM-5 ... continued below

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V., Golubeva; U., Rohatgi; Korableva, A.; Anischenko, O.; Kustov, L.; Nissenbaum, V et al. August 29, 2012.

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This paper addresses the problem of controlling hydrocarbon emissions from cold-start of engines by investigating the adsorbents which could adsorb the hydrocarbons at cold temperatures and hold them to 250-300 ?. The materials, that has been studied, are based on the modification of ZSM-5 (SiO{sub 2}/Al{sub 2}O{sub 3} = 35) zeolite with Li, K, Na cations. It has been shown that the introduction of Li, Na and K in an amount that is equivalent to the content of Al in zeolite results in occurrence of toluene temperature desorption peaks at high-temperatures. The toluene temperature desorption curves for 5%Li-ZSM-5 and 2.3%Na-ZSM-5 zeolites are identical and have peak toluene desorption rate between 200 to 400 ?. Upon analysis of toluene adsorption isotherms for 2.3%Na-ZSM-5 and 5%Li-ZSM-5, it was concluded that the toluene diffusion inside of the modified zeolites channels is extremely slow and the sorption capacity of 2.3%Na-ZSM-5 is higher than with 5%Li-ZSM-5. The 2.3%Na-ZSM-5 didn't change toluene temperature programmed desorption (TPD) rate of curve after the treatment in environment with 10% ?{sub 2}? at 750-800 ? for about 28 h. The 2.3%Na-ZSM-5 zeolite is very promising as adsorbent to control the cold-start hydrocarbon emissions.

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  • CAPoC9 (Ninth International Congress on Catalysis and Automotive Pollution Control ; Brussles, Belgium; 20120829 through 20120831

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  • Report No.: BNL--98040-2012-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 1044763
  • Archival Resource Key: ark:/67531/metadc846239

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  • August 29, 2012

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  • May 19, 2016, 9:45 a.m.

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  • July 21, 2016, 7:07 p.m.

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V., Golubeva; U., Rohatgi; Korableva, A.; Anischenko, O.; Kustov, L.; Nissenbaum, V et al. The use Na, Li, K cations for modification of ZSM-5 zewolite to control hydrocarbon cold-start emission, article, August 29, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc846239/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.