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New Acetaldehyde Process
Agency of Ind. Sci. Tech., Jap. Pat. 3/221,143. Palladium/magnesia catalyst for NOx removal. L Forni, N.A. Sinitsina et al., J. Chem. Sot., Faraday Trans., 86 (1992) 1941. Structure of various defective perovskitelike catalysts, active in hydrocarbon oxidation and NO decomposition. Toyata Jidosha KK, Europ. Pat. 496,526 (1992). NOx removal in two stages, (i) Pt/alumina (ii) iron-containing ZSM-5 zeelite catalysts. Ford Motor Co., US Pat. 5,192&X3 (1992). Tiiania and alumina as a support for palladium. W.R. Grace & Co., US Pat. 5,192,859 (1992). Technique of ceria impregnation. Nissan Motor KK, Jap. Pat. 3/232,531. Three-way catalyst with separate Pt/Pd and Rh layers. M. Skoglundh, J.P. Jacobs et al., Catal. Lett., 13 (1992) 27. Characterisation of Pt/Pd-monolith combustion catalyst. NGK Insulators Ltd, Europ. Pat 492,945 (1992). Honeycomb substrate coated with Rhhirconia and Pt/alumina-ceria-lanthana. lnstitut Francais du Petrole, US Pat. 5198,978 (1992). Uranium and cerium oxides in supports of platinum group metals. General Motors Corp., Europ. Pat. 468,556 (1992). Methane-fuelled engines, combined with a catalytic method for reducing emissions. Nippon Shokubai Kagaku Kogyo Co. Ltd, US Pat. 5,196,802 (1992). Palladium and rhodium on a honeycomb support for diesel engine exhaust purification. Engelhard Corp., US Pat. 5,109,632 (1992). Combustion of carbon particles from diesel engines on a fitter with coating of magnesia and Pt and/or Rh. Nippon Shokubai Co. Ltd, Europ. Pat. 494,591 (1992). Titania in a honeycomb
applied catalysis B: environmental
support for Pt/Pd/Rh for diesel engine exhaust puriiication. New Acetaldehyde Process Catalytlca has successfully tested on the pilot plant scale [D. Rotman and E. Kirschner, Chem. Week, 158(23) (17 June 1992) n] a novel catalyst that aims to avoid chlorinated by-products during acetaldehyde production. The process, similar to conventional Wacker technology, uses a palladium catalyst to oxidise ethylene to acetaldehyde. But rather than using a copper chloride co-catalyst. the re-oxidation of palladium is performed with a phosphomolybdovanadate polyoxoanions catalyst. Catalytica has been able to optimise the catalyst’s oxidation potential, reducing the amount of chlorinated wastes by up to a thousand-fold. The yield is comparable to those given by existing processes and the catalyst system could have applications in other alkene conversion processes, such as the direct oxidation of butenes to MEK. (Source: API Abstracts - Catalysts & Catalysis) New Technology for Economic Recovery of Bromine from Waste Streams A new catalytic process to recover elemental bromine from hydrobromic acid waste streams on site has been developed by Catalytica. The process provides an environmentally and economically advantageous method of handling waste bromide streams. Conventional hydrobromic acid recovery methods use chlorine gas and produce sodium chloride brines, which must be disposed of as waste. Moreover, the conventional technology is Volume 1 No. 3 -
29 September 1992
applied catalysis B: environmental
support for Pt/Pd/Rh for diesel engine exhaust puriiication. New Acetaldehyde Process Catalytlca has successfully tested on the pilot plant scale [D. Rotman and E. Kirschner, Chem. Week, 158(23) (17 June 1992) n] a novel catalyst that aims to avoid chlorinated by-products during acetaldehyde production. The process, similar to conventional Wacker technology, uses a palladium catalyst to oxidise ethylene to acetaldehyde. But rather than using a copper chloride co-catalyst. the re-oxidation of palladium is performed with a phosphomolybdovanadate polyoxoanions catalyst. Catalytica has been able to optimise the catalyst’s oxidation potential, reducing the amount of chlorinated wastes by up to a thousand-fold. The yield is comparable to those given by existing processes and the catalyst system could have applications in other alkene conversion processes, such as the direct oxidation of butenes to MEK. (Source: API Abstracts - Catalysts & Catalysis) New Technology for Economic Recovery of Bromine from Waste Streams A new catalytic process to recover elemental bromine from hydrobromic acid waste streams on site has been developed by Catalytica. The process provides an environmentally and economically advantageous method of handling waste bromide streams. Conventional hydrobromic acid recovery methods use chlorine gas and produce sodium chloride brines, which must be disposed of as waste. Moreover, the conventional technology is Volume 1 No. 3 -
29 September 1992