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Catalyst carrier or catalyst, and process for production thereof

A catalyst carrier and catalyst technology, which is applied in the direction of catalyst activation/preparation, catalyst protection, chemical instruments and methods, etc., can solve the problems of small exhaust gas volume and poor purification performance, and achieve the effect of improving heat resistance and NOx purification performance

Inactive Publication Date: 2012-08-15
FCC KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, it has been pointed out that the amount of exhaust gas it treats is relatively small, especially the purification performance of NO (nitrogen oxide) gas is poor

Method used

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  • Catalyst carrier or catalyst, and process for production thereof
  • Catalyst carrier or catalyst, and process for production thereof
  • Catalyst carrier or catalyst, and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0076] Then, the temperature of the catalyst layer was raised from room temperature to 600°C at a rate of 45°C / min. At each temperature during the heating process, the gas composition at the inlet and outlet of the catalyst layer was determined using infrared spectroscopy and magnetic oxygen analysis. Finally, the decontamination activity was evaluated. image 3 The evaluation results are shown. In addition, under similar conditions, the purification activity of the catalyst carrier of Example 3 was evaluated. Figure 4 The evaluation results are shown. In view of the above, even the catalyst support (Example 3) containing only 50 mol% spinel can achieve the oxidation activity of HC and CO and the reduction activity of NO. However, the degree of activity was found to be significantly lower compared with the catalyst on which Pd was supported, whereby the effect of Pd supported thereon could be confirmed.

[0077] In addition, in order to examine the thermal durability of t...

Embodiment 7

[0079] Durability at 900°C of Example 7

[0080]

[0081] (Experiment 4): Purification activity and thermal durability of the catalysts of Examples 8 to 10 and Comparative Example at 900°C

Embodiment 8

[0084] Durability at 900°C of Example 8

[0085]

[0086] Table 4

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Abstract

Disclosed are: a catalyst which can utilize magnesium aluminate (MgAl2O4) as a catalyst carrier, has improved heat resistance, and enables the improvement in NOx purification rate readily, or a catalyst carrier; and a process for producing the catalyst or the catalyst carrier. Specifically disclosed are: a catalyst carrier or a catalyst, which can be produced through an aqueous solution preparation step (S1), an aqueous solution filling step (S2), a drying step (S3), a pre-firing step (S4) and a firing step (S5), and which comprises magnesium aluminate (MgAl2O4) having a specific surface area of 80 to 150 (m2 / g) and a pore volume of 0.45 to 0.65 (ml / g), wherein a noble metal can be supported on the catalyst carrier or the catalyst; and a process for producing the catalyst carrier or the catalyst.

Description

technical field [0001] The present invention relates to magnesium aluminate (MgAl 2 o 4 ) catalyst support or catalyst, and methods of making said catalyst support or catalyst. Background technique [0002] Generally, it is considered that exhaust gas purification catalysts suffer performance degradation due to particle growth of noble metal fine particles constituting catalyst components. Precious metal fine particles are generally used by dispersing them on the surface of a heat-resistant alumina carrier (catalyst carrier). As the ambient temperature increases, these particles diffuse and move on the alumina support and aggregate, thus leading to particle growth. Attempts are made to reduce performance degradation of noble metal catalysts by reducing such diffusion and movement of noble metal particles on the support surface. Therefore, the development of the technology has been going on. [0003] For example, PTL 1 discloses a method of reducing particle movement and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01D53/94B01J21/10B01J23/63B01J33/00F01N3/10F01N3/28
CPCB01D53/945B01D2255/1023B01D2255/2047B01D2255/2065B01J23/005B01J23/58B01J23/63B01J35/002B01J35/1019B01J35/1042B01J37/0201Y02T10/12
Inventor 小县祐介铃木凉友田昭彦
Owner FCC KK
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