Binary oxide catalysts synthesized by sequential precipitation Brooks

BINARY OXIDE CATALYSTS SYNTHESIZED BY SEQUENTIAL PRECIPITATION C. S. BROOKS 

Sequential precipitation of mixed hydroxides of the Cu/Al, Cu/Cr, Ni/Fe and Cu/Fe have been conducted in the acid with aluminum, chromlnum or ferric hydroxide as the sorption/precipitation of copper or nickel as the second demonstrated that after air calcine (250-35Cf C) enhanced lytic activity for the room temperature decomposition of and oxidation of benzaldehyde are provided by the binary Cu/Fe and Ni/Fe. 

The hydroxide coprecipitates were air calcined at 250 or 350 C. For selected systems BET surface areas and carbon monoxide chemisorption measurements were made. Xray diffraction measurements were made on selected samples to characterize crystallinity. Catalytic performance tests were conducted at 20° C for hydrogen peroxide decomposition and benzaldehyde oxidation by hydrogen peroxide. 

Several investigation (1-5) of the preparation of supported catalysts have used special adsorption conditions for anionic and cationic Pt species involving the ion exchange characteristics of the alumina or silica support and conducting adsorption on the acid pH side of the zero point of change (ZPC). 

The novel aspect of the present approach is the use of a freshly precipitated hydroxide such as aluminum, chromium or ferric hydroxide instead of a calcined, stabilized oxide as the support. 

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