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In order to further improve the performance of NOx storage-reduction catalysts (NSR catalysts), focus was placed on their high temperature performance deterioration via sulfur poisoning and heat deterioration. The reactions between the basicity or acidity of supports and the storage element, potassium, were analyzed. It was determined that the high temperature performance of NSR catalysts is enhanced by the interaction between potassium and zirconia, which is a basic metal oxide. Also, a new zirconia-titania complex metal oxides was developed to improve high temperature performance and to promote the desorption of sulfur from the supports after aging.

The liquid crystal day & night mirror with excellent reflective characteristics has been developed. The day & night mirror using Guest-Host liquid crystal devices improves the performance of rear view mirrors. Effects of primary factors on reflective characteristics of the liquid crystal day & night mirror have been investigated. Results are as follows. (1) The reflective characteristics at wavelength of about 555 nm are important for the selection of liquid crystals and dichroic dyes. (2) The reflective characteristics are improved by decreasing the reflectivity of glass substrate. (3) The reflective characteristics are improved by increasing the reflectivity of reflector.