Johnson Matthey Public Limited Company

Johnson Matthey & Co., Limited

Wgch Technology Limited

Chematur Engineering Ab

Brian Harrison

Xianghong Hao

Alan F Diwell

Geoffrey McCool

Peter William Ash

Ramesh Sharma

Piers Scott Grumett

Dietmar Wahl

Gary James Acres

Barry John Cooper

Lars Berhil Stenmark

Anders Gidner

Simon Collard

A supported palladium-gold catalyst is produced under mild conditions using a commonly available base, such as sodium hydroxide (NaOH) or sodium carbonate (NaCO). In this method, support materials and a base solution are mixed together and the temperature of the mixture is increased to a temperature above room temperature. Then, palladium salt and gold salt are added to the mixture while maintaining the pH of the mixture to be greater than 7.0 and keeping the mixture at a temperature above room temperature. This is followed by cooling the mixture while adding acetic acid to maintain the pH of the mixture to be within a desired pH range, filtering out the supported palladium-gold particles, washing with a pH buffer solution and calcining.

Palladium&#x2014;gold catalyst synthesis

Palladium-gold catalyst synthesis

A bulk sample is fed with a liquid into a mixing tank () where it is stirred to form a dispersion. A proportion of the dispersion is recycled from the bottom of the tank through a line to the top of the tank so that at least the dispersion in the recycle loop () is substantially homogeneous, and a representative sample of the dispersion is taken from the recycle loop, e.g. using a slurry sampler ().

Waste materials sampling, assaying for desired components or metals, and refining

Waste material handling, sampling and metal content value calculation

A supercritical oxidation process carried out in water is capable of oxidizing 'organics' in precious metal organic compositions such as heterogeneous (Pt/C) or homogeneous precious metal catalysts and producing a precious metal oxide with few by-products and low losses of precious metal.

Precious metal recovery from organics-precious metal compositions with supercritical water reactant

A process for improving the lead tolerance of a motor vehicle exhaust purification catalyst system of the type comprising a platinum group metal catalyst carried on alumina. The improvement derives from impregnating the alumina with barium moiety and firing at at least 400.degree. C. before subsequent impregnation with the metal catalyst moiety.

Process for making a lead-tolerant catalyst system for purifying exhaust

This invention relates to catalysts, especially for the catalytic oxidation of hydrocarbons and carbon monoxide and for the catalytic reduction of oxides of nitrogen in the presence, respectively, of suitable oxidizing and reducing means. In more detail, the catalyst of the invention is capable of removing oxygen from a gas containing an excess of oxygen and restoring such removed oxygen to a gas having an oxygen deficiency, and the catalyst comprises at least one of the platinum group metals platinum, rhodium, ruthenium, palladium, indium and osmium and one or more base metals at least one of which has two or more oxidation states.

Catalysts

This invention relates to catalysts suitable for the purification of exhaust gases. In particular a catalyst according to the invention comprises a compound selected from the group represented by the general formula A.sub.x M.sub.y O.sub.z in which A is one or more metals selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, Al, Sc, Y, the lanthanides, Ti, Zr, V, Cr, Mn, Fe, Co, Ni, Cu, Zn; M is a metal selected from the group consisting of Ir, Rh, Pt, Pd, and Ru; y has an integral or fractional value within the range from 0.1 to 3.0, z is an integer with a value from 2 to 7 and x has a value such that the compound is electrically neutral.

Catalyst for the purification of an exhaust gas

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Bedfordshire, United Kingdom

Brian Harrison