Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1983-01-26
1984-10-09
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
4232135, B01J 2104, B01J 2310, B01J 2358
Patent
active
044762461
ABSTRACT:
Catalysts are made from supports which are doubly promoted with ceria and an alkali metal oxide by adding these promoters and the catalytic noble metal components in a specified order. The ceria is first applied to the support. It can be applied in a salt form such as cerous nitrate. This impregnated support is then calcined to form a deposit of ceria. Next, solutions bearing the noble metals are applied to the ceria-promoted support and with these solutions the alkali metal component is applied. After subsequent elevated temperature activation, the alkali metal component is converted to an alkali metal oxide and the noble metals are converted into their metallic or oxide form.
When lithium is chosen as the alkali metal promoter, it can alternatively be applied to the support along with the initial ceria promoter. After calcining the support to yield the ceria and lithia promoters, the noble metals can then be deposited and subsequently activated at an elevated temperature. Using this process it is possible to have the noble metals deposited on the support so that their penetration depth is less than 300 microns as measured by the SnCl.sub.2 solution staining method to provide an effective three-way catalyst suitable for use in auto emission control.
REFERENCES:
patent: 3755556 (1973-08-01), Aldridge et al.
patent: 3903020 (1975-09-01), Sergeys et al.
patent: 3932309 (1976-01-01), Graham et al.
patent: 3993572 (1976-11-01), Hindin et al.
patent: 4051073 (1977-09-01), Hegedus et al.
patent: 4054644 (1977-10-01), Segura et al.
patent: 4140749 (1979-02-01), Baresel et al.
patent: 4179408 (1979-12-01), Sanchez et al.
patent: 4369132 (1983-01-01), Kinoshita et al.
Kim, "Ceria-Promoted Three-Way Catalysts for Auto Exhaust Emission Control", Ind. Eng. Chem. Prod. Res. Dev., vol. 21, No. 2, (1982), pp. 257-274.
Barber et al., Three Way Catalysts: Screening for Wide Window Performance, AIChE 91st National Meeting, Paper No. 30a, (Aug. 19, 1981).
Exposed Aluminum Ions as Active Sites on .gamma.-Alumina, J. H. Lunsford, L. W. Zingery and M. P. Rosynek, Journal of Catalysis 38, 1975, pp. 179-188.
Development of More Active and Durable Automotive Exhaust Catalysts, Michael V. Ernest and Gwan Kim, SAE Technical Paper Series 800083, Feb. 25-29, 1980, pp. 1-12.
Ernest Michael V.
Kim Gwan
Cabic Edward J.
Shine W. J.
W. R. Grace & Co.
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