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US 10,300,462 B2Granted
High concentration silver solutions for ethylene oxide catalyst preparation
AssigneeScientific Design Company, Inc.
InventorsLixin Cao, Andrzej Rokicki
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AssigneeScientific Design Company, Inc.
InventorsLixin Cao, Andrzej Rokicki
Estimating the term…
A silver impregnation solution comprising: (i) silver ions, (ii) a silver concentration enhancer selected from at least one ammonium salt having an anionic component that is thermally decomposable; or at least one amino acid, or a combination thereof, (iii) at least one organic amine; and (iv) water; wherein said components (i)-(iii) are dissolved in said impregnation solution, and oxalic acid may or may not be included. The silver impregnation solution can achieve significantly higher silver concentrations, including at least or above 33, 34, or 35 wt %. Methods for producing a silver catalyst by silver impregnation of a refractory support followed by calcination are also described. The resulting silver catalysts possess high silver loadings of typically at least 17, 18, or 19 wt %.
A silver impregnation solution comprising:
A method for producing a catalyst effective in the oxidative conversion of ethylene to ethylene oxide, the method comprising subjecting a refractory carrier impregnated with a liquid silver-containing solution to a calcination process, wherein said liquid silver-containing solution comprises:
A silver impregnation solution comprising:
Dependencies are inferred from the claim text.