Compositions – X-ray or neutron shield
Patent
1980-11-05
1982-05-18
Shine, W. J.
Compositions
X-ray or neutron shield
568473, B01J 2350
Patent
active
043304370
ABSTRACT:
A process for preparing a granular, supported silver catalyst by: contacting refractory porous granules having a tap volume of about 1 to 2 grams per cubic centimeter with water or a water soluble liquid having a boiling point of less than about 105.degree. C. so as to wet said granules and to absorb water or said soluble liquid within peripheral pores of said granules; contacting the wet granules with an ammoniated solution containing a silver salt which decomposes on calcination at a temperature below about 600.degree. C. and a fatty acid having from about 12 to 22 carbon atoms, the quantity of silver salt in said solution being sufficient to provide a metallic silver deposit onto said granules of from about 1 to 10% by weight of said dry granules; drying the silver solution on the granules, and heating the dried granules at a temperature sufficient to decompose the dried silver compounds to metallic silver. The catalyst is particularly advantageous for the manufacture of formaldehyde in place of the use of silver crystals.
REFERENCES:
patent: 3258433 (1966-06-01), Lambert et al.
patent: 3775346 (1973-11-01), Calcagno et al.
patent: 3956184 (1976-05-01), Kruglikov et al.
patent: 3962136 (1976-06-01), Nielsen et al.
patent: 4087383 (1978-05-01), Gernand et al.
Borden Inc.
Maskas George P.
Mast Daniel D.
Shine W. J.
Van Wyck Kenneth P.
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