3. Catalyst waste
Precious metal catalysts are used in industry and transport.
In industry, rhodium-plated platinum wire cloth (approx. 90% Pt, 10% Rh) is used for the gas-phase oxidation of ammonia in the manufacture of nitric acid. Still in fabric form, platinum is used to manufacture hydrocyanic acid, a basic product for plastics, and salts for galvanic deposits.
Catalysts for hydrocarbon hydrogenation reactions are platinoids deposited on a porous alumina support. Platinum accounts for 0.5 to 1% of the catalyst mass, while rhodium, in the Rh/Pt ratio = 0.3 to 0.5%, extends the catalyst's working life. Palladium catalysts are available for olefins and dehydrogenation. Other hydrogenation reactions using palladium dispersed in carbon (Pd-C) include the catalytic hydrogenation of carbonyl compounds to alcohols, aldehydes and ketones to alcohols, organosynthesis...
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Catalyst waste
References
Economic benchmarks for precious metals recovery
The fields of computers and printed circuit boards on the one hand, and catalytic converters on the other, will be considered separately.
Electronic Scraps
In 1980, a computer was bought for scrap at between 150 and 300 E/t. In 2001, given the technological changes that have led to a sharp drop in precious...
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