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Super Sulfur Soaker Material May Help Control Diesel Emissions

Date:
September 12, 2005
Source:
Pacific Northwest National Laboratory
Summary:
The mineral cryptomelane holds promise to absorb the toxic sulfur oxides that can degrade the emission control systems on diesel vehicles. Pacific Northwest National Laboratory researchers have identified the potential for using cryptomelane to trap sulfur dioxide and sulfur trioxide from diesel engine emissions on monolith supports – sturdy honeycombed structures composed of small parallel channels.

Cryptomelane is an excellent catalyst for oxidizing sulfur dioxide.
Credit: Image courtesy of Pacific Northwest National Laboratory

The mineral cryptomelane holds promise to absorb the toxic sulfuroxides that can degrade the emission control systems on dieselvehicles. Pacific Northwest National Laboratory researchers haveidentified the potential for using cryptomelane to trap sulfur dioxideand sulfur trioxide from diesel engine emissions on monolith supports –sturdy honeycombed structures composed of small parallel channels.

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Cryptomelane has a very high capacity for absorbing sulfur dioxide –more than 10 times as high as those of standard metal oxide-basedabsorbents. Finding a way to capture sulfur is important since mostfuels have a sulfur content that is harmful to the environment, clogsemissions control devices or damages fuel cells.

PNNL researchers tested cryptomelane under diesel engine conditionsthat are being proposed to trap nitrogen oxides – the most dangerouscomponent of diesel exhaust. Under those conditions, including hightemperatures, the cryptomelane maintains its very high sulfur dioxidecapacity. These studies indicate that cryptomelane can be used toprotect the nitrogen oxides traps from the sulfur oxide that degradesthem under these conditions.

Finding cryptomelane to be an excellent catalyst for oxidizingsulfur dioxide, PNNL researchers have filed for a patent on thisapplication. They believe the catalyst may degrade additionalundesirable material and are looking for research partners todemonstrate the usefulness of cryptomelane.

###

Pacific Northwest National Laboratory researcher Liyu Li presented his results Thursday, Sept. 1.


Story Source:

The above story is based on materials provided by Pacific Northwest National Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

Pacific Northwest National Laboratory. "Super Sulfur Soaker Material May Help Control Diesel Emissions." ScienceDaily. ScienceDaily, 12 September 2005. <www.sciencedaily.com/releases/2005/09/050911111618.htm>.
Pacific Northwest National Laboratory. (2005, September 12). Super Sulfur Soaker Material May Help Control Diesel Emissions. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2005/09/050911111618.htm
Pacific Northwest National Laboratory. "Super Sulfur Soaker Material May Help Control Diesel Emissions." ScienceDaily. www.sciencedaily.com/releases/2005/09/050911111618.htm (accessed October 25, 2014).

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