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SiOC porous ceramic supported La0.9K0.1CoO3 nano particle catalyst and preparation method

A technology of nano-particles and porous ceramics is applied in the field of perovskite catalysts to achieve the effects of simple preparation process, high thermal stability and high chemical activity

Inactive Publication Date: 2011-07-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the loading of complex oxides on the pore surface of porous SiOC ceramics

Method used

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  • SiOC porous ceramic supported La0.9K0.1CoO3 nano particle catalyst and preparation method
  • SiOC porous ceramic supported La0.9K0.1CoO3 nano particle catalyst and preparation method
  • SiOC porous ceramic supported La0.9K0.1CoO3 nano particle catalyst and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 12.9906g La(NO 3 )·6H 2 O, 0.3271g CH 3 COOK, 8.3030g Co(CH 3 COO) 2 4H 2 O and 13.2113 g of glucose were dissolved in 100 ml of deionized water. Water bath at 80°C for three days, and dry gel was obtained after cooling. Roast the dry gel in a muffle furnace: raise the temperature to 120°C at a rate of 3°C / min, keep it for 30 minutes, raise it to 400°C at a rate of 2°C / min, keep it for 2 hours, and then heat it at 10°C / min The heating rate was increased to 800 ° C, kept for 2 h, and then cooled to room temperature with the furnace to obtain the perovskite catalyst La 0.9 K 0.1 CoO 3 , grind for later use. Weigh 2g La 0.9 K 0.1 CoO 3 Pour 2ml of oleic acid into a 100ml beaker, sonicate for 20min, add ammonia water until the pH of the solution is 6; magnetically stir at room temperature for 2h, sonicate for 10min; dry the mixture in an oven at 50°C for 10h to obtain OA@La 0.9 K 0.1 CoO 3 . Weigh 2.5g OA@La 0.9 K 0.1 CoO 3 , 30mg K 2 S 2 o 8 Pou...

Embodiment 2

[0019] La in this example 0.9 K 0.1 CoO 3 Nanoparticle preparation and La 0.9 K 0.1 CoO 3 The nanoparticle modification steps are the same as in Example 1. The difference is: weigh 1g PHMS and 1g D 4 Pour Vi into a 25ml beaker, sonicate for 10min, put in a stirrer, stir magnetically at room temperature for 1h, add 0.02g of methyl vinyl siloxane coordination platinum catalyst, and continue stirring for 1h; add 0.2g of PS@La to the above system 0.9 K 0.1 CoO 3 , mixed, and magnetically stirred for 45 minutes; pour the precursor liquid into a glass mold, put it into a constant temperature oven, set the temperature at 50°C, keep it for 4 hours, then raise the temperature to 80°C, keep it for 2 hours, take out the crosslinked body from the mold after cooling, put it in Crystallization dish for pyrolysis; put the cross-linked body in an alumina crucible and place it in the constant temperature zone of a high-temperature tube furnace; control the gas flow rate within the rang...

Embodiment 3

[0021] La in this example 0.9 K 0.1 CoO 3 Nanoparticle preparation and La 0.9 K 0.1 CoO 3 The nanoparticle modification steps are the same as in Example 1. The difference is: weigh 1g PHMS and 1g D 4 Vi was poured into a 25ml beaker, ultrasonicated for 10min, put into a stirrer, stirred magnetically at room temperature for 1h, added 0.02g of methyl vinyl siloxane coordination platinum catalyst, and continued to stir for 1h; added 0.4g of modified La 0.9 K 0.1 CoO 3 (PS@La 0.9 K 0.1 CoO 3 ), mixed, and magnetically stirred for 45 minutes; pour the precursor liquid into a glass mold, put it into a constant temperature oven, set the temperature at 50°C, keep it for 4 hours, then raise the temperature to 80°C, keep it for 2 hours, take out the cross-linked body from the mold after cooling, put Put the cross-linked body into the crystallization dish for pyrolysis; put the cross-linked body in the alumina crucible, and place it in the constant temperature zone of the hig...

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Abstract

The invention discloses a SiOC porous ceramic supported La0.9K0.1CoO3 nano particle catalyst and a preparation method. SiOC porous ceramic is used as a carrier in the catalyst, and La0.9K0.1CoO3 nano particles are supported on the carrier. The preparation method comprises the following steps of: preparing the La0.9K0.1CoO3 nano particles by using lanthanum nitrate, potassium acetate, cobalt acetate and glucose; performing oleic acid packing and styrene emulsion polymerization reaction on the La0.9K0.1CoO3 nano particles to obtain modified La0.9K0.1CoO3 nano particles; preparing a catalyst precursor by using hydrogen containing polydimethylsiloxane (PHMS), 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D4Vi), methyl vinyl siloxane coordinated platinum catalyst and the modified La0.9K0.1CoO3 nano particles; and performing pyrolysis on the precursor to obtain the catalyst. The preparation process is simple; and the modified La0.9K0.1CoO3 nano particle catalyst has high mechanical strength, good chemical stability, high thermal stability and high chemical activity. The catalyst is particularly suitable for aftertreatment of diesel engine automobile tail gas.

Description

technical field [0001] The invention relates to a SiOC porous ceramic loaded La 0.9 K 0.1 CoO 3 The catalyst and the preparation method of the nanoparticles belong to the perovskite catalyst technology. Background technique [0002] Due to its advantages of high thermal efficiency, low fuel consumption rate, good reliability and low carbon dioxide emissions, diesel engine has become the main power of motor vehicles, but the nitrogen oxides (NO x ) and particulates (PM) seriously endanger human health and pollute the air environment. Therefore, reducing diesel engine PM and NO x The emission is an important technical research direction in the current internal combustion engine research field. Exhaust aftertreatment technology is to reduce diesel engine NO x and PM emissions, an indispensable technical measure to meet stricter emission regulations. Removal of NO from diesel engine exhaust x The catalyst carrier of PM and PM mostly uses wall-flow honeycomb ceramic filte...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/10B01D53/94B01D53/56
Inventor 龚彩荣王晓飞李亚利范国樑
Owner TIANJIN UNIV
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