Gas processing method for catalytically oxidising carbon monoxide and hydrocarbons using a compound based on a metal and a silica-containing zirconia
A technology of silicon dioxide and catalytic oxidation, which is used in the treatment of exhaust gas from internal combustion engines, and in the field of catalytic oxidation of carbon monoxide and hydrocarbons, which can solve the problems of limited effectiveness and performance degradation of three-way catalysts
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Embodiment 1
[0068] This example relates to the preparation of a composition based on oxides of zirconium and silicon, wherein the proportions by weight of the oxides are 90% and 10%, respectively.
[0069] Solution A was prepared by mixing 173.8 grams of zirconium nitrate solution (21% by weight on an oxide basis) and 240 grams of distilled water in a stirred beaker. Meanwhile, solution B was prepared in another stirred beaker by mixing 100 mL of ammonia solution (29 vol%) and 300 mL of distilled water.
[0070] Solution A was added to the stirred reactor, followed by gradual addition of solution B with stirring. The pH of the medium reaches a value of at least 9.5. 21.3 g of sodium silicate solution (19% by weight, calculated as oxide) were then added gradually, still with stirring.
[0071] The suspension thus obtained was placed in an autoclave made of stainless steel equipped with a stirrer. The temperature of the medium is brought to 150° C. for 2 hours with stirring.
[0072] Af...
Embodiment 2
[0080] This example relates to the preparation of a composition based on oxides of zirconium and silicon, wherein the proportions by weight of the oxides are 95% and 5%, respectively.
[0081] Solution A was prepared by mixing 10.7 g of sodium silicate solution (19% by weight as oxide) with 40 mL of ammonia solution (29% by volume) and 330 mL of distilled water in a stirred beaker. At the same time, 184.4 g of zirconium nitrate solution B (21% by weight, calculated as oxide) was also prepared.
[0082] Solution A and Solution B were simultaneously and gradually added to the stirred reactor.
[0083] The suspension thus obtained was placed in an autoclave made of stainless steel equipped with a stirrer. The temperature of the medium is brought to 150° C. for 2 hours with stirring.
[0084] After returning to ambient temperature, the resulting precipitate was filtered off and washed with distilled water.
[0085] 48 g of this precipitate were extracted.
[0086] Meanwhile, a...
Embodiment 3
[0092]This example relates to the preparation of a composition based on oxides of zirconium and silicon, wherein the proportions by weight of the oxides are 80% and 20%, respectively.
[0093] Solution A was prepared by mixing 42.6 g of sodium silicate solution (19% by weight as oxide) with 40 mL of ammonia solution (29% by volume) and 330 mL of distilled water in a stirred beaker. At the same time, 155.3 g of zirconium nitrate solution B (21% by weight, calculated as oxide) was also prepared.
[0094] The procedure as in Example 2 was followed.
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