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Anti-hydrothermal aging and sulfur-resistant irpdpt/irpd catalyst and its preparation method and application

A catalyst, hydrothermal resistance technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of shortened service life, limited catalyst durability, and reduced catalyst Active and other issues, to achieve good sulfur resistance, high durability, good hydrothermal aging resistance

Active Publication Date: 2018-09-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rare natural gas tail gas purification catalysts commonly used now are single palladium or high palladium low platinum catalysts. Using fresh catalysts to catalyze the oxidation of lean natural gas vehicle exhaust can meet the National V emission standards, but the durability of this type of catalyst is relatively limited.
In addition, a small amount of sulfur in natural gas will greatly reduce the activity of the catalyst and shorten its service life. How to improve the sulfur resistance of the catalyst is also a research hotspot and difficulty in the field of natural gas vehicle exhaust purification catalysts

Method used

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  • Anti-hydrothermal aging and sulfur-resistant irpdpt/irpd catalyst and its preparation method and application
  • Anti-hydrothermal aging and sulfur-resistant irpdpt/irpd catalyst and its preparation method and application
  • Anti-hydrothermal aging and sulfur-resistant irpdpt/irpd catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 10g ZrO 2 Add 6.3mL H to the powder 2 IrCl 6 solution, the H 2 IrCl 6 The solution contains 0.05g of Ir, stirred for 30 minutes to form a meat floss-like wet powder, left to stand for 2 hours, dried at 80°C for 2 hours, then dried at 120°C for 2 hours, and the dried powder was placed in a muffle furnace and roasted at 500°C for 8 hours. Get 0.5% Ir / ZrO 2 catalyst powder;

[0028] (2) 0.5% Ir / ZrO obtained in step (1) 2 Add 6.3mL Pd(NO 3 ) 2 with Pt(NO 3 ) 4 In the mixed solution, the mixed solution contains 0.15g of Pd and 0.03g of Pt, stirred for 30min to form a wet powder like meat floss, left for 2h, dried at 60°C for 5h, then dried at 105°C for 3h, and the dried powder Put it in a muffle furnace and bake at 550°C for 3h to get 0.5%Ir-1.5%Pd-0.3%Pt / ZrO 2 Catalyst powder, the catalyst powder is the IrPdPt catalyst.

[0029] The resulting powdered IrPdPt catalyst was fabricated into a monolithic catalyst, and the monolithic fresh and hydrothermally aged ...

Embodiment 2

[0038] (1) 10g 15% ZrO 2 -85% Al 2 o 3 Add 13mL H to the powder 2 IrCl 6 solution, the H 2 IrCl 6 The solution contains 0.03g of Ir, stirred for 30 minutes to form a meat floss-like wet powder, allowed to stand for 3 hours, dried at 80°C for 3 hours, then dried at 120°C for 3 hours, and the dried powder was placed in a muffle furnace and roasted at 500°C for 6 hours. Get 0.3%Ir / 15%ZrO 2 -85% Al 2 o 3 catalyst powder;

[0039] (2) 0.3%Ir / 15%ZrO obtained in step (1) 2 -85% Al 2 o 3 Add 13mL Pd(NO 3 ) 2 In solution, the Pd(NO 3 ) 2 The solution contains 0.15g of Pd, stirred for 30min to form a meat floss-like wet powder, left to stand for 2h, dried at 80°C for 3h, then dried at 120°C for 3h, the dried powder was placed in a muffle furnace and roasted at 600°C for 3h, Get 0.3%Ir-1.5%Pd / 15%ZrO 2 -85% Al 2 o 3 Catalyst powder, the catalyst powder is the IrPd catalyst.

[0040] The resulting IrPd catalyst was fabricated into a monolithic catalyst, and the monolith...

Embodiment 3

[0049] (1) 10g Al 2 o 3 Add 13mL H to the powder 2 IrCl 6 solution, the H 2 IrCl 6 The solution contains 0.01g Ir, stirred for 30 minutes to form a meat floss-like wet powder, left to stand for 2 hours, dried at 80°C for 5 hours, then dried at 120°C for 3 hours, and the dried powder was placed in a muffle furnace and roasted at 600°C for 3 hours to obtain 0.1%Ir / Al 2 o 3 catalyst powder;

[0050] (2) 0.1% Ir / Al obtained from step (1) 2 o 3 Add 13mL of Pd(NO 3 ) 2 with Pt(NO 3 ) 4 In the mixed solution containing 0.15g Pd and 0.03g Pt, the mixed solution was stirred for 30 minutes to form a meat floss-like wet powder, left to stand for 2 hours, dried at 80°C for 5 hours, and then dried at 120°C for 3 hours, and the dried powder was placed Calcined at 500°C for 8 hours in a muffle furnace to obtain 0.1%Ir-1.5%Pd-0.3%Pt / Al 2 o 3 Catalyst powder, the catalyst powder is the IrPdPt catalyst.

[0051] The resulting IrPdPt catalyst was fabricated into a monolithic cata...

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Abstract

The invention provides a preparation method of an anti-hydrothermal aging and sulphur-resistant IrPdPt / IrPd catalyst. The preparation method comprises the following steps of (1) uniformly mixing a powder carrier material and an iridium salt solution to form wet powder, drying the wet powder, roasting for 3 to 8h at the temperature of 500 to 600 DEG C, and obtaining iridium-contained catalyst powder; (2) uniformly mixing the iridium-contained catalyst powder and a mixed solution of palladium salt and platinum salt to form wet powder, drying the wet powder, roasting for 3 to 8h at the temperature of 500 to 600 DEG C, and obtaining an IrPdPt catalyst; or uniformly mixing the iridium-contained catalyst and a palladium salt solution to form wet powder, drying the wet powder, roasting for 3 to 8h at the temperature of 500 to 600 DEG C, and obtaining an IrPd catalyst. The invention further provides application of the IrPdPt or IrPd catalyst prepared through the method in natural gas motor vehicle tail gas treatment, gasoline motor vehicle tail gas treatment and methane catalytic combustion.

Description

technical field [0001] The invention belongs to the field of noble metal catalysts, in particular to a hydrothermal aging-resistant and sulfur-resistant IrPdPt / IrPd catalyst, a preparation method and application thereof. Background technique [0002] With the rapid development of the economy, the number of automobiles has increased rapidly, and the pollution caused by automobile exhaust to the environment has become increasingly serious. Lean-burn natural gas vehicle exhaust NO x With low content and less particulate matter, it gradually replaces gasoline vehicles in central cities and becomes a new clean energy vehicle. However, the greenhouse effect of unburned methane is CO 2 21 times. Therefore, the research and development of catalysts with high activity, durability and good sulfur resistance at low temperature is a hot spot in this field. [0003] The noble metal palladium has excellent low-temperature oxidation activity of methane. The noble metal platinum has ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J23/63B01D53/94B01D53/72B01D53/62
CPCB01D53/94B01D2258/01B01J23/002B01J23/468B01J23/63B01J2523/00B01J2523/31B01J2523/3712B01J2523/48
Inventor 任成军郭天贻张映奇陈耀强
Owner SICHUAN UNIV
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