Catalyzer for purifying CO under certain environmental condition
A technology of catalysts and composite oxides, applied in the direction of physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, chemical instruments and methods, etc. Inability to obtain low-temperature active loaded gold catalysts and other issues, to achieve good anti-sulfur poisoning and good anti-water vapor poisoning effects
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example 1
[0011] Example 1: A gold catalyst was prepared by deposition and precipitation. Take the shaped composite oxide support CoOx / Al 2 o 3 1.0g, it was added to distilled water, under vigorous stirring with 0.5M Na 2 CO 3 The solution was adjusted to pH 8. Heating and maintaining the system temperature at 70°C. Then add 0.25 mL of 0.1M chloroauric acid dropwise, while continuing to add 0.5M Na 2 CO 3 To maintain the pH of the system at 8. After reacting for 1 hour, filter, wash, dry overnight at 90°C, and then bake at 400°C to obtain Au:CoOx:CoOx / Al 2 o 3 Au / CoOx / Al with a weight ratio of 1:10:200 2 o 3 catalyst. The finished product is in the form of small balls with a uniform black color.
[0012] The raw gas composition is CO: 0.5%, O 2 : 21%, N 2 : 78.5% (volume percentage), gas volume space velocity is 8000h -1 , the catalyst catalyzes the complete conversion of CO to CO 2 The allowable minimum reaction temperature is -18°C (255K).
example 2
[0013] Example 2: A gold catalyst was prepared using the deposition precipitation method described in Example 1. Take the shaped composite oxide support CoOx / Al 2 o 3 1.0g, it was added to distilled water, and 5.0g of urea was added under vigorous stirring. Then add 0.25mL of 0.1M chloroauric acid, heat, and maintain the system temperature at 70°C until the pH value of the system reaches 8.0. Filter, wash, dry overnight at 90°C, and then bake at 400°C to obtain Au:CoOx:CoOx / Al 2 o 3 Au / CoOx / Al with a weight ratio of 1:10:200 2 o 3 catalyst. The finished product is in the form of small balls with a uniform black color.
[0014] When using the feed gas and gas volume space velocity described in Example 1, the catalyst catalyzes CO completely into CO 2 The allowable minimum reaction temperature is below -30°C (<243K).
example 3
[0015] Example 3: 1.0g FeOx / Al 2 o 3 The carrier was added to distilled water, and the deposition and precipitation method described in Example 2 was used to prepare Au: FeOx: FeOx / Al 2 o 3 Au / FeOx / Al with a weight ratio of 1:10:200 2 o 3 catalyst. The finished catalyst is in the shape of small balls and is uniformly black.
[0016] When using the feed gas and gas volume space velocity described in Example 1, the catalyst catalyzes CO completely into CO 2 The allowable minimum reaction temperature is below -30°C (<243K).
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