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Manufacturing method for efficient three-component catalyst coating

A technology of three-way catalyst and production method, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., which can solve the problems of high production cost, unfavorable optimization treatment, and catalyst coating slurry production process Complicated issues

Inactive Publication Date: 2016-07-20
HUNAN JIANTE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some technologies use more than three layers of coating technology, which also means more than three times of roasting, and the production process of catalyst coating slurry is more complicated and the production cost is higher.
Moreover, the catalyst characteristics of each coating are the same, which is not conducive to optimizing the oxidation and reduction chemical reactions of CO, HC and NOx

Method used

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  • Manufacturing method for efficient three-component catalyst coating
  • Manufacturing method for efficient three-component catalyst coating
  • Manufacturing method for efficient three-component catalyst coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Apply the catalyst carrier made by the three-stage, two-layer, two-baking coating scheme described in the second coating scheme of the present invention, cylindrical, with a pore density of 600cpsi (number of holes per square inch), a diameter of 105.7mm, and a length of 130.0mm. Volume is 1.14 liters.

[0044] (Such as Figure 2B One of the second coating schemes shown) The first layer of one-stage (upstream half-stage) catalyst coating material, for the formulation of hydrocarbon (HC) emission control under engine cold start conditions, with a load of 2.26g / L The precious metal palladium (Pd) is used as the main catalyst element, and the loading amount of the coating material is 130g / L (calculated on the basis of half the volume of the carrier). The catalyst raw materials are alumina (45wt%), cerium-zirconium composite solid solution (18wt% ZrO 2 , 27 wt% CeO 2 ). The rest (La 2 o 3 , Y 2 o 3 , NiO, BaO) and other oxides 10wt%;

[0045] The three-way catalyst...

Embodiment 2

[0049] Apply the invention Figure 2A The catalyst carrier made by the shown three-stage two-layer two-baking coating scheme (one of the second schemes) is cylindrical, with a pore density of 600 cpsi (pores per square inch), a diameter of 93.0 mm, a length of 101.6, and a volume of is 0.69 liters.

[0050] The first layer of one-stage (upstream half-stage) catalyst coating material is formulated for the control of hydrocarbon (HC) emissions under engine cold start conditions, and the precious metal Pd (~1.77g / L) with a high loading is used as the main catalyst element , the total coating material loading is 125g / L. The catalyst raw materials are alumina (46wt%), cerium-zirconium composite solid solution (29wt% ZrO 2 , 15wt% CeO 2 ). The rest (La 2 o 3 、Nd 2 o 3 , PrO, NiO) and other oxides 10wt%;

[0051] The three-way catalyst formula used in the second-stage (downstream half-stage) catalyst coating material of the first layer, the total loading of palladium and rho...

Embodiment 3

[0055] This example is mainly aimed at gasoline engines whose nitrogen oxides are the main control objects in the exhaust components of automobiles. The catalyst carrier made by applying the 4-stage, two-layer, two-baking coating scheme of the present invention is cylindrical, with a pore density of 600 cpsi (pores per square inch), a diameter of 93.0 mm, a length of 101.6, and a volume of 0.69 liters.

[0056] Such as Figure 3A and 3B As shown, the catalyst coating material of the first stage (upstream half stage) adopts a standard three-way catalyst formula, and the total loading of palladium and rhodium is 0.61g / L (the ratio of palladium and rhodium is 6:1). The coating material load is 125g / L (calculated based on the volume of the carrier in the upstream half section). The catalyst raw materials are alumina (42wt%), cerium-zirconium composite solid solution (18wt% ZrO 2 , 30wt% CeO 2 ). The rest (La 2 o 3 , Yi 2 o 3 , PrO, NiO) and other oxides 10wt%. Higher per...

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Abstract

The invention discloses a manufacturing method for an efficient three-component catalyst coating. The manufacturing method comprises the following steps: combining coating materials which are formed from a catalysis element, auxiliaries and various coating oxides and have different functions according to CO, HC and NOx oxidation and reduction control mechanism; segmenting a same carrier (at segmenting ratio of 1:2, 1:1 or 2:1), layering (at weight duty ratio of inner layer and surface layer of 2:1 or 1:1) and coating, wherein totally different tail gas control characteristics along axial direction of the carrier (airflow direction) is obtained according to an inner and outer two-layer secondary roasting forming compounding technique, so that the reduction process of nitric oxide (NOx) and the oxidation process for removing hydrocarbon compound (HC) and carbon monoxide (CO) happen in a certain sequence as required. The catalyst activity is effectively utilized, and meanwhile, the high-temperature ageing resisting property is promoted, the defects of alloying of different precious metals and alloying of precious metal and coating metallic oxide material are avoided, the design flexibility of the catalyst is enhanced and the optimal effect of the automobile exhaust control is achieved.

Description

technical field [0001] The invention belongs to the field of automobile exhaust control, and in particular relates to a method for preparing a high-efficiency three-way catalyst coating. Background technique [0002] The traditional method of three-way catalyst coating for automobile exhaust control at home and abroad is to evenly coat catalyst raw materials mixed in a certain proportion on the honeycomb ceramic or honeycomb metal carrier. These raw materials include alumina, zirconia, cerium oxide (or cerium-zirconium solid solution) ) and other metal oxides, rare earth oxides and some other additives. The manufactured three-way catalytic converter is installed in the exhaust system of the automobile internal combustion engine. When the automobile exhaust flows through the three-way catalyst, the three harmful gases carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) are simultaneously eliminated. Oxidized or reduced to non-toxic carbon dioxide (CO 2 ), wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/02B01J37/02B01D53/94B01D53/62B01D53/56B01D53/72B01J35/00
CPCB01D53/9418B01D53/944B01J23/002B01J23/8946B01J37/0228B01J2523/00B01J35/00B01J35/30B01J2523/31B01J2523/48B01J2523/3712B01J2523/3706B01J2523/36B01J2523/847B01J2523/25Y02A50/20
Inventor 姚小刚刘建国姚建辉欧阳清检陈力
Owner HUNAN JIANTE TECH CO LTD
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