Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Patent
1990-11-19
1992-12-29
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
502243, 502247, 502262, B01J 2106, B01J 2342, B01J 2322
Patent
active
051751364
ABSTRACT:
Chemically and thermally stable monolithic catalysts are disclosed having platinum or alkali metal-vanadium active phases for use in the conversion of sulfur dioxide to sulfur trioxide. The platinum catalyst comprises a foraminous ceramic support which has at its wall surfaces a high surface area substrate for an active catalyst phase, and a combination of a platinum active phase and a promoter on the substrate. The substrate preferably comprises silica, provided, for example, by application of a silica washcoat. The promoter is selected from among compounds of zirconium, hafnium and titanium.
The alkali-vanadium catalyst comprises a foraminous ceramic support having a porous silica substrate for the active phase at its foraminal wall surfaces. An alkali metal-vanadium active catalyst is in the pores of the porous silica.
Methods for producing the catalysts of the invention are described, as is a method for producing sulfur trioxide with the platinum catalyst, in which the catalyst is regenerated with a mineral acid when activity has declined through aging or exposure to the conditions of the oxidation of sulfur dioxide.
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patent: 4680281 (1987-07-01), Fennemann
patent: 4904633 (1990-02-01), Ohata et al.
Dees Carl F.
Monsanto Company
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