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Catalyst support for purification of exhaust gas, catalyst for purification of exhaust gas using same, and method for producing catalyst support for purification of exhaust gas

一种催化剂载体、净化废气的技术，应用在催化剂活化/制备、物理/化学过程催化剂、非均相催化剂化学元素等方向，能够解决耐热性不如贵金属、晶粒生长、OSC或催化活性降低等问题，达到抑制晶粒生长、大总孔隙体积和比表面积的效果

Active Publication Date: 2015-05-06
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, catalysts including supports prepared by the powder mixing method (PTL1 to PTL3) or the co-precipitation method (PTL3 and PTL4) do not necessarily have excellent heat resistance: there is a reduction in the OSC or catalytic activity of these catalysts when exposed to high temperatures. example
In particular, transition metals such as copper, which are cheaper than the above-mentioned noble metals, can be effectively used as catalysts for purifying exhaust gas; however, these transition metals are inferior to noble metals in heat resistance, and transition metals tend to cause grain growth
Thus, there are instances where the catalytic activity of transition metals decreases when exposed to high temperatures

Method used

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  • Catalyst support for purification of exhaust gas, catalyst for purification of exhaust gas using same, and method for producing catalyst support for purification of exhaust gas
  • Catalyst support for purification of exhaust gas, catalyst for purification of exhaust gas using same, and method for producing catalyst support for purification of exhaust gas
  • Catalyst support for purification of exhaust gas, catalyst for purification of exhaust gas using same, and method for producing catalyst support for purification of exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0123] First, 13.75 g of cerium ammonium nitrate, 12.43 g of zirconyl nitrate, 0.82 g of yttrium nitrate, 8.78 g of aluminum nitrate, and 1.24 g of lanthanum nitrate were dissolved in 500 g of ion-exchanged water to prepare a first raw material solution containing cations , these cations will be used as raw materials for porous composite metal oxides. These additions correspond to a cation concentration of 0.1 mol / L, where A1 2 o 3 : CeO 2 : ZrO 2 : Y 2 o 3 : La 2 o 3 =10.0:36.2:47.9:2.0:3.9 (mass ratio). Next, 62.5 g of polyethyleneimine having a weight average molecular weight of 10000 represented by the following structural formula (1) and 78 g of nitric acid were dissolved in 360 g of ion-exchanged water to prepare a second raw material solution.

[0124] [Chemical Structural Formula 1]

[0125]

[0126] Next, by using figure 1 The production equipment shown in (SUPER AGITATION REACTOR) was used to prepare nano-colloidal solutions of metal compounds. It shoul...

example 2

[0130] 10.58 g of ceric ammonium nitrate, 9.51 g of zirconyl nitrate, 0.71 g of yttrium nitrate, 1.07 g of lanthanum nitrate, and 15.27 g of aluminum nitrate were dissolved in 500 g of ion-exchanged water to prepare an aqueous solution containing cations to be used as Raw materials for porous composite metal oxides. These additions correspond to a cation concentration of 0.1 mol / L, where A1 2 o 3 : CeO 2 : ZrO 2 : Y 2 o 3 : La 2 o 3 =20.0:31.9:42.2:2.0:3.9 (mass ratio). Except that this aqueous solution was used as the first raw material solution, similarly to Example 1, a transparent nanocolloid solution (pH 4) of a metal compound was prepared, and then, a porous composite metal oxide powder was prepared.

example 3

[0132] 8.22 g of ceric ammonium nitrate, 7.38 g of zirconium oxynitrate, 0.65 g of yttrium nitrate, 1.00 g of lanthanum nitrate, and 20.03 g of aluminum nitrate were dissolved in 500 g of ion-exchanged water to prepare an aqueous solution containing cations to be used as Raw materials for porous composite metal oxides. These additions correspond to a cation concentration of 0.1 mol / L, where A1 2 o 3 : CeO 2 : ZrO 2 : Y 2 o 3 : La 2 o 3 =29.5:27.9:36.9:2.0:3.9 (mass ratio). Except that this aqueous solution was used as the first raw material solution, similarly to Example 1, a transparent nanocolloid solution (pH 4) of a metal compound was prepared, and then, a porous composite metal oxide powder was prepared.

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PUM

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Abstract

A catalyst support for purification of exhaust gas comprises a porous composite metal oxide, the porous composite metal oxide containing alumina, ceria, and zirconia and having an alumina content ratio of from 5 to 80% by mass, wherein after calcination in the air at 1100 DEG C for 5 hours, the porous composite metal oxide satisfies a condition such that standard deviations of content ratios (as at% unit) of aluminum, cerium and zirconium elements are each 19 or less with respect to 100 minute areas (with one minute area being 300 nm in length x 330 nm in width) of the porous composite metal oxide, the standard deviation being determined by energy dispersive X-ray spectroscopy using a scanning transmission electron microscope equipped with a spherical aberration corrector.

Description

technical field [0001] The present invention relates to a catalyst carrier for purifying exhaust gas, a catalyst for purifying exhaust gas using the catalyst carrier, and a method of producing the catalyst carrier for purifying exhaust gas. Background technique [0002] As catalysts for purifying exhaust gas, well known are three-way catalysts in which a noble metal such as platinum, rhodium or palladium is supported on a substrate made of alumina, titania, silica, zirconia, On a metal oxide carrier made of cerium, etc. Also, in practice, multiple kinds of metal oxide supports are mixed or laminated to improve catalytic activity by utilizing the characteristics of the respective metal oxide supports. For example, ceria has an oxygen storage capacity (OSC) that stores oxygen when the oxygen concentration in the exhaust gas is high and releases oxygen when the oxygen concentration in the exhaust gas is low; however, the heat resistance of ceria is relatively weak . [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J23/40B01J37/04B01D53/94
CPCB01J21/066B01J23/44B01J23/63B01D53/945B01J37/0063B01D2255/1023B01D2255/2065B01D2255/20715B01D2255/20761B01D2255/2092B01D2255/908B01D2255/9205B01D2255/9207B01J23/10B01J21/04B01J2523/00B01J37/0201B01J23/002B01J23/83B01J37/04B01J37/08Y02T10/12B01J35/393B01J35/30B01J35/23B01J35/612B01J35/40B01J35/613B01J35/64B01J35/638B01J35/633B01J35/635B01J35/66B01J2523/31B01J2523/36B01J2523/3706B01J2523/3712B01J2523/48B01J2523/824B01J2523/17B01J35/643B01J35/647B01J35/651B01J35/653B01J35/657
Inventor 熊谷直树森川彰小西佳惠佐藤仁俊田边稔贵须田明彦三浦真秀镇西勇夫铃木宏昌信川健林高弘
Owner TOYOTA JIDOSHA KK
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