Copper-Based Auto Exhaust Oxidation Catalysts. Deactivation and Physical Attrition

Abstract

untreated catalyst. The resistance of zeolites to attack by (or dissolution in) aqueous acids follows the same order.At lower temperatures (<210°C) the activity of NaY for the decomposition of the secondary ester remained constant. Constant activities were observed for silica-aluminas with the normal ester at 190°C (Sanyal and Weller, 1971), but our sample of silica-alumina aged at 190°C in the decomposition of the secondary ester. The activity of AgY increased slowly with time in the decomposition of the secondary ester at 140-170°C. Apparently, the silver ion is reduced to metallic silver by the reactant or products, and the zeolite is transformed to the hydrogen form.

A Novel in Situ γ-Alumina Coating Method and CO Oxidation over MoO3/Cu Catalysts

“…Cu has earlier been used with Mn, Co, Cr, and Pt as a catalyst in auto-exhaust catalyst, but MoO 3 has not yet been explored much in this area. [13][14][15][16][17][18][19] Experimental Section Preparation of the Catalyst Bed. Alternative strategies were used to dip coat boehmite [AlO(OH)] sol onto cordierite.…”

“…In this work, three catalysts were prepared: (i) Cu, (ii) MoO 3 , and (iii) Cu + MoO 3 combined as a one-way auto-exhaust catalyst to study some significant conversions discussed later. Cu has earlier been used with Mn, Co, Cr, and Pt as a catalyst in auto-exhaust catalyst, but MoO 3 has not yet been explored much in this area. − …”