Nalco Chemical Company

Katalco Corp.

Imperial Chemical Industries Limited

George N Pessimisis

James R Jennings

Gerald R Feistel

The Abstract of the Invention is a method of making a solution of the nitrates of iron and chromium from a spent catalyst containing oxides of iron and chromium, which method comprises:

Method of making an iron oxidechromium oxide catalyst

Hydrotreating catalysts are prepared using multiple impregnation and a critical ratio of VIB metal to VIII metal in one or more stages to produce catalysts which have higher than normal activity in contaminant removal from hydrocarbon feed stocks, especially in both sulfur and nitrogen removal, which catalysts also contain relatively low or no acidic residues such as P.sub.2 O.sub.5 and permit use of lower effective operating temperature for a predetermined percentage of contaminant removal, for example, at 85% removal of sulfur.

Hydrotreating catalyst preparation and process

Method for recovery of metals from spent iron-chrome shift catalyst and

A method of preparing a solution of the nitrate of iron and mixed chromium from a spent iron oxide-chrome oxide shift catalyst which comprises dissolving said spend iron oxide-chrome oxide shift catalyst with nitric acid in the presence of from 5-25% by weight of the catalyst of an additive selected from the group consisting of ferrous sulfate and sodium thiosulfate.

Method of dissolving iron oxide-chrome oxide spent shift catalysts to

Porous silica particles useful in catalysis are prepared by adding excess alkali to a body of water glass; the excess alkali is responsible for increasing the pore diameter.

Silica-alumina and silica catalyst support bodies

The addition of citric acid to large amounts of catalyst fines allows their incorporation into catalyst formulations without the loss of important physical properties.

Use of citric acid to make catalyst from catalyst fines

A method for preparing a hydrotreating catalyst having a controlled pore distribution is disclosed. The method requires adding to the alumina prior to forming from 0.1 to 15% by weight of a water soluble polycarboxylic acid having from 2 - 22 carbon atoms. The resulting formed alumina support after being calcined has a pore volume distribution such that most of the pore volume in pores greater than 200 A in diameter as measured by Mercury penetration porosimitry is substantially eliminated. The pore volume as measured by nitrogen adsorption in the range of between 100 A and 1200 A is reduced. The polycarboxylic acid may be added to the catalyst carrier prior to forming in different ways such as by dissolving the catalytically active metals with the water soluble polycarboxylic acid and then impregnating hydrothermally or by pore volume or by adding a water soluble polycarboxylic acid salt to the hydrous or xero gel after precipitation.

Method for preparing an alumina as a support for a hydrotreating catalyst

Porous silica-alumina products useful in catalysis are prepared by adding excess alkali to a body of water glass, the excess alkali is responsible for rendering the product extrudable and for increasing the pore diameter.

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Westchester, IL, United States of America

George N Pessimisis