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Manganese oxide/titanium dioxide catalyst for FCC (catalytic cracking) regenerated flue gas denitrification, preparation method therefore and applications

A titanium dioxide and flue gas regeneration technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of unsatisfactory low-temperature denitration performance of manganese-based oxide catalysts, etc. problem, to achieve the effect of less harsh preparation conditions, good dispersibility and simple preparation method

Inactive Publication Date: 2015-12-09
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] It can be seen that the low-temperature denitrification performance of manganese-based oxide catalysts is not ideal, and it is still an urgent problem to find manganese-based oxide catalysts with lower denitrification temperature and wider active temperature range.

Method used

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  • Manganese oxide/titanium dioxide catalyst for FCC (catalytic cracking) regenerated flue gas denitrification, preparation method therefore and applications
  • Manganese oxide/titanium dioxide catalyst for FCC (catalytic cracking) regenerated flue gas denitrification, preparation method therefore and applications
  • Manganese oxide/titanium dioxide catalyst for FCC (catalytic cracking) regenerated flue gas denitrification, preparation method therefore and applications

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: preparation carrier meso-TiO 2

[0059] (1) Add 20mL of tetrabutyl titanate and 4mL of acetylacetone to 60mL of absolute ethanol and stir thoroughly to obtain solution A; add 5g of ammonium sulfate and 20g of urea to 50mL of deionized water and stir thoroughly to obtain solution B.

[0060] (2) Add solution B to solution A to obtain solution C; the process of adding solution B to solution A is as follows: solution B enters the membrane diffuser under the action of a peristaltic pump, and at the same time starts the gas input device, nitrogen permeates The 40nm micropores on the two ceramic membrane tubes diffuse out of the membrane tubes, generating a large number of nitrogen bubbles to promote the complete mixing of the solution. The nitrogen flow rate is 10-100mL / min.

[0061] (3) Transfer solution C to an autoclave, react at 100°C for 24h, centrifuge the reacted product, wash and filter, then put it in a 120°C oven for 8h, and then bake it in a muffle fu...

Embodiment 2

[0062] Embodiment 2: Mn (20wt.%) / TiO 2 Catalyst preparation

[0063] (1) Add 10mL of tetrabutyl titanate and 2mL of acetylacetone to 20mL of absolute ethanol and stir thoroughly to obtain solution A; add 4.4734g of 50% manganese nitrate solution by mass, 2.5g of ammonium sulfate and 7.5g of urea Add it into 25mL of deionized water and stir well to obtain solution B.

[0064] (2) Add solution B to solution A to obtain solution C; the process of adding solution B to solution A is as follows: solution B enters the membrane diffuser under the action of a peristaltic pump, and at the same time starts the gas input device, and nitrogen passes through the two The 40nm micropores on the root ceramic membrane tube diffuse to the outside of the membrane tube, generating a large number of nitrogen bubbles to promote the complete mixing of the solution. The nitrogen flow rate is 10-100mL / min.

[0065] (3) Transfer solution C to an autoclave, crystallize at 80°C for 30h, centrifuge the c...

Embodiment 3

[0066] Embodiment 3: Mn (25wt.%) / TiO 2 Catalyst preparation

[0067] (1) Add 10mL tetrabutyl titanate and 10mL acetylacetone to 30mL absolute ethanol, stir thoroughly to obtain solution A; add 6.3236g manganese nitrate solution with a mass percentage of 50%, 2.5g ammonium sulfate and 20g urea into 75mL of deionized water and stirred thoroughly to obtain solution B.

[0068] (2) Add solution B to solution A to obtain solution C; the process of adding solution B to solution A is: enter the configured solution B into the membrane diffuser under the action of the peristaltic pump, and start the gas input device at the same time, nitrogen Diffuse through the 40nm micropores on the two ceramic membrane tubes to the outside of the membrane tubes to generate a large number of nitrogen bubbles to promote the complete mixing of the solution. The nitrogen flow rate is 10-100mL / min.

[0069] (3) Transfer solution C to an autoclave, crystallize at 120°C for 20 hours, centrifuge the cryst...

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Abstract

The invention provides a manganese oxide / titanium dioxide catalyst for FCC (catalytic cracking) regenerated flue gas denitrification, a preparation method therefore and applications. The manganese oxide / titanium dioxide catalyst is prepared through a hydrothermal method: a solution containing a titanium source and a solution containing a manganese source, pore-enlarging agents and ammonium sulfate optionally are mixed, a hydrothermal reaction is carried out, the reaction products are subjected to solid-liquid separation, the obtained solid is washed, dried and baked, and the manganese oxide / titanium dioxide catalyst is obtained. The manganese oxide / titanium dioxide catalyst is a nano-level load-type oxide catalyst, the dispersibility of active components is good, the preparation method is simple, the active temperature window is wide (at a temperature of 150-350 DEG C, the denitration efficiency is more than 90%), and the low temperature activity is good (at a temperature of 150 DEG C, the denitration efficiency reaches 98%). In addition, the provided catalyst has advantages of large comparison area, high thermal stability, high N2 selectivity and the like, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a manganese oxide / titania catalyst for FCC regeneration flue gas denitrification, a preparation method and application thereof. 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 of which is NO, the volume percentage is about 90%, and the remaining 10% is NO 2 . According to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/56B01D53/86B82Y30/00
Inventor 刘坚周燕赵震于富红崔丽凤史恒昌宋卫余韦岳长李建梅张潇
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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