Abstract
Disproportionation of NO has been investigated on various Y-type zeolites by the pulse-reaction technique. Alkaline-earth Y-type zeolites showed high activity. The order of catalytic activity presently obtained is as follows: CaY > CdY > MgY > ZnY > LaY > BeY > NaY > LiY > KY > SrY > BaY, AgY, HgY, FeY, AlY = 0. A volcano-type relationship was found between the catalytic activity and the radius of the exchanged cation in the case of alkaline-earth, zinc family and alkali-metal Y-type zeolites. CaY, CdY and NaY-type zeolites, each with a radius of exchanged cation ca. 1Å in size, showed maximun activity of their families. TPD profiles had three peaks corresponding to NO, NO and N 2O desorption with increasing temperature. The volcano-type relationship was also found between the peak area of each TPD profile and the radius of exchanged cation. The catalytic activity increases with increase of pretreatment temperature, reaches a broad maximum at 700°C and decreases with the collapse of zeolite structure in further increase of the pretreatment temperature.
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