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Catalyst for FCC regeneration flue gas denitration, preparation method and application thereof

A technology for regeneration of flue gas and catalyst, which is applied in the field of FCC regeneration flue gas denitrification, preparation, and catalyst for FCC regeneration flue gas denitrification. The effect of short preparation cycle, high resistance to dust erosion, and wide active temperature window

Inactive Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (BEIJING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium-titanium catalysts not only have high activation temperature, but also V 2 o 5 Helps to remove SO from flue gas 2 oxidation and N 2 The formation of O, which leads to shortened catalyst life and reduced selectivity, is also obvious, which is unfavorable for the SCR reaction.
Moreover, flue gas denitrification SCR technology is very mature, but its investment and operating costs are still high, which limits the development and application of SCR technology

Method used

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  • Catalyst for FCC regeneration flue gas denitration, preparation method and application thereof
  • Catalyst for FCC regeneration flue gas denitration, preparation method and application thereof
  • Catalyst for FCC regeneration flue gas denitration, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of Example 1 Mn-loaded cerium-titanium bimetallic composite oxide catalyst (Ce / Ti=0.3)

[0051] First, 10 g of tetrabutyl titanate was added into 30 ml of absolute ethanol, stirred thoroughly, and recorded as solution A. Subsequently, 0.3817 g of cerium nitrate was weighed and dissolved in a mixed solution of 1 ml of deionized water and 10 ml of absolute ethanol, which was designated as solution B. After mixing solutions A and B, stir thoroughly for 60-120 minutes, then add concentrated hydrochloric acid dropwise to the above solution, adjust the pH value to 1, continue stirring for 60-120 minutes, and then transfer the uniformly stirred solution to the surface After aging in the air for 18-48 hours in a dish, it was dried at 100°C for 12 hours and calcined at 500°C for 4 hours to obtain a cerium-titanium bimetallic composite oxide carrier.

[0052] Weigh 4g of the above-prepared cerium-titanium bimetallic composite oxide support and place it in an oven at ...

Embodiment 2

[0055] Preparation of Example 2 Fe-loaded cerium-titanium bimetallic oxide catalyst (Ce / Ti=0.3)

[0056] The synthesis steps of the cerium-titanium bimetallic composite oxide support are the same as in Example 1.

[0057] Weigh 4g of the above-prepared cerium-titanium bimetallic composite oxide carrier and place it in an oven at 80°C for 6 hours, then weigh 0.5787g of ferric nitrate to prepare aqueous solution C, and then add solution C dropwise to the dried and In the above materials that have been cooled, add them dropwise while stirring, then transfer them to a muffle furnace after ultrasonication and drying, and raise the temperature to the target temperature of 500 °C at a rate of 2 °C / min, and keep the temperature at this temperature for 6 hours to obtain FCC regeneration flue gas denitrification catalyst.

[0058] XRD characterization was carried out on the prepared FCC regeneration flue gas denitrification catalyst, and its XRD spectrum is as follows figure 1 Shown; ...

Embodiment 3

[0059] Preparation of Example 3 Mo-loaded cerium-titanium bimetallic oxide catalyst (Ce / Ti=0.3)

[0060] The synthesis steps of the cerium-titanium bimetallic composite oxide support are the same as in Example 1.

[0061] Weigh 4g of the above-prepared cerium-titanium bimetallic composite oxide support and place it in an oven at 80°C for 6 hours to dry, then weigh 0.1472g of ammonium molybdate to make aqueous solution C, and then add solution C dropwise to the dried And the above materials that have been cooled, are added dropwise while stirring, and then transferred to a muffle furnace after being ultrasonically dried and raised to a target temperature of 500°C at a heating rate of 2°C / min, and kept at this temperature for 6 hours. A catalyst for FCC regenerated flue gas denitrification is obtained.

[0062] XRD characterization was carried out on the prepared FCC regeneration flue gas denitrification catalyst, and its XRD spectrum is as follows figure 1 Shown; BET characte...

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Abstract

The invention relates to a catalyst for FCC regeneration flue gas denitration, a preparation method and an application of the catalyst. The catalyst contains a titanium-cerium bimetal composite oxide carrier and an active component transition metal oxide loaded on the surface of the carrier, wherein the molar ratio of cerium to titanium atoms is 0.1-0.5, and the transition metal oxide is any one or a mixture of at least two of manganese oxide, iron oxide, molybdenum oxide, tungsten oxide or cadmium oxide. According to the method, by taking tetrabutyl titanate and the like as a titanium source, cerium nitrate or cerium sulfate and the like as a cerium source, and transition metal salt, deionized water, ethanol and concentrated hydrochloric acid as raw materials simultaneously, the steps of solution stirring and mixing, air evaporation self-assembling, drying and roasting, and the like are carried out, the molding intensity of the catalyst is improved by further adopting an end hardening technology preferably. The catalyst provided by the invention is relatively short in preparation time and relatively high in low temperature reactivity when being used in regeneration flue gas denitration SCR reaction, and is high in dust washing resistance and good in application prospect.

Description

technical field [0001] The invention relates to FCC regeneration flue gas denitrification technology, specifically, the invention relates to a catalyst for FCC regeneration flue gas denitrification, a preparation method and an application thereof, belonging to the technical field of environmental protection. Background technique [0002] Catalytic cracking (FCC) unit is an important unit in the deep processing of crude oil, and occupies a pivotal position in the oil refining industry. During the catalytic cracking reaction, when the raw oil cracks, 30% to 50% of the nitrogen-containing compounds enter the oil coke, and then deposit on the surface of the catalyst. The activity of the catalyst is reduced due to the oil coke attached to the surface, so it must be regenerated. During regenerator charring, most of the nitrogenous compounds are converted to N 2 , but 10% to 30% are converted into NO x , discharged with the regeneration flue gas, the main component is NO, the vo...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/83B01J23/28B01J23/30B01J23/10B01D53/86B01D53/56
Inventor 刘坚于富红赵震石娟韦岳长崔丽凤史恒昌史曾昌冯大庆
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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