A co to co2 combustion promoter

Inactive Publication Date: 2021-01-21
COCHISE TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text explains that using a noble metal eggshell can help reduce NOx formation during combustion. This is because NOx forming reactions are slower and less diffusion limited than CO to CO2 reactions. Therefore, by adding more noble metal to the combustion promoter, more NOx is generated. Overall, this technology can help achieve cleaner and more efficient combustion.

Problems solved by technology

High residual concentration of carbon monoxide in flue gases from regenerators has been a problem.
Afterburning has caused significant damage to plant equipment.
A disadvantage of all noble metal based CO to CO2 combustion promoters is that relatively large amounts of noble metal are required to achieve the desired CO combustion in the FCC process.

Method used

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  • A co to co2 combustion promoter
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0061]A two-step impregnation was carried out using a high purity gamma alumina support as purchased from Sasol. In the first step, 10 g of alumina powder was impregnated with water to fill 90% of the pore volume. At a pore volume of 0.5 mL / g, 4.5 mL of water was required for 10 g of alumina powder. For the second step, the wet alumina particles from step 1 with 90% of the pore volume filled with water were impregnated with a solution of palladium nitrate and dried to achieve an eggshell of palladium on the particle surface. The second impregnation step was completed before the pre-filled alumina particles were dried. After completing both impregnation steps, the impregnated particles were calcined at 600° C. for 1 hour to form a particle with the composition in accordance with this invention.

example 2

[0062]0.1 g of the composition of Example 1 was mixed with 10 g of a commercial FCC catalyst. The mixture was then used to measure the oxidation of CO in a fluid bed reactor fitted with a thermocouple. The catalyst bed was heated to 600° C. prior to the start of CO / O2 flow. Oxidation response was measured using a mixture of 1.8 v / v % CO and 0.9 v / v % O2, balanced with He, under a gas flow rate of 1000 cc / min. The oxidation response is a measure of the amount of CO which is combusted (oxidized) to CO2.

example 3

[0065]A two-step impregnation was carried out using a high purity gamma alumina support as purchased from Sasol. In the first step, 10 g of alumina powder was impregnated with water to fill 90% of the pore volume. At a pore volume of 0.5 mL / g, 4.5 mL of water was required for 10 g of alumina powder. For the second step, the wet alumina particles from step 1 with 90% of the pore volume filled with water were impregnated with a solution of platinum nitrate and dried to achieve an eggshell of platinum on the particle surface. The second impregnation step was completed before the pre-filled alumina particles were dried. After completing both impregnation steps, the impregnated particles were calcined at 600° C.

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Abstract

The invention is directed to a CO to CO2 combustion promoter comprising microsphere sized porous silica and / or alumina comprising particles further comprising on or more Group VIII noble metals wherein the noble metal is distributed in the particle as an eggshell such that a higher content of noble metal is present in the outer region of the particle as compared to the content of noble metal in the center of the particle.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit under 35 U.S.C. § 119(e) of U.S. Provisional Application No. 62 / 651,295 filed Apr. 2, 2018 and Dutch Application No. 2020819 filed Apr. 24, 2018, the contents of which are incorporated herein by reference in their entireties.FIELD OF THE INVENTION[0002]The invention is directed to a CO to CO2 combustion promoter comprising microsphere sized porous alumina particles comprising one or more Group VIII noble metals.BACKGROUND OF THE INVENTION[0003]Such CO to CO2 combustion promoters are well known and are used in a fluid catalytic cracking (FCC) unit. In such a FCC process fluidizable catalyst particles are contacted in a conversion zone at high temperatures with hydrocarbons such to crack higher boiling hydrocarbons to lower boiling hydrocarbons, typically boiling in the gasoline range. The catalyst may be a crystalline zeolitic aluminosilicate component, usually an ion-exchanged form of a synthetic crystallin...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/44B01J23/42B01J23/63B01J21/12B01J21/04B01J21/08B01J35/00B01J35/08B01J35/10B01J37/02B01J37/08B01J8/18B01J8/26C01B32/50C10G11/04
CPCB01J23/8926C10G11/04B01J23/42B01J23/63B01J21/12B01J21/04B01J21/08B01J35/008B01J35/08B01J35/1014B01J35/1019B01J35/1038B01J37/0221B01J37/0236B01J37/088B01J8/1827B01J8/26C01B32/50B01J23/44B01J37/0045B01J37/0201B01J37/0205B01J23/894B01J37/0207B01D53/864B01D2255/1021B01D2255/1023B01D2255/2092C10G11/18C10G11/02Y02P30/40B01J35/31B01J35/397B01J35/30B01J35/40B01J35/613B01J35/633B01J35/615B01J35/51
Inventor ARU, GUIDO WILLIAM
Owner COCHISE TECH LLC
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