Honeycomb structure

A honeycomb structure and honeycomb technology, applied in household appliances, clay products, applications, etc., can solve problems such as deactivation, and achieve excellent effects of NOx purification rate and thermal durability

Inactive Publication Date: 2015-07-22
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, there are also problems such as V being heated to form a block and deactivated.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0131] 3910 mass parts of titanium dioxide, 210 mass parts of ammonium metavanadate as vanadium raw material, 670 mass parts of ammonium metatungstate (50% solution) as tungsten raw material, 300 mass parts of alumina binder, 170 mass parts of wollastonite fiber 300 parts by mass of methylcellulose as a forming aid, 80 parts by mass of sorbitan trioleate as a forming lubricant, 150 parts by mass of diethanolamine as a pH regulator, and 1750 parts by mass of ion-exchanged water Mixing to prepare raw material paste 1. The molar ratio (W / V) of vanadium atoms in the vanadium raw material to tungsten atoms in the tungsten raw material was 0.8.

[0132] Next, the raw material paste 1 was extruded using an extrusion molding machine to produce a rectangular prism-shaped honeycomb formed body. Then, using a batch microwave dryer, the honeycomb formed body was dried under a drying pressure of 86.7kPa for 6 minutes, then the honeycomb formed body was put into a gas circulation furnace, ...

Embodiment 2

[0138] A honeycomb structure 10' was produced in the same manner as in Example 1, except that the oxygen concentration in the mixed gas introduced during firing was 40% (nitrogen concentration: 60%).

Embodiment 3

[0140] 170 parts by mass of ammonium metavanadate was added to an 8% diethanolamine aqueous solution prepared from 150 parts by mass of diethanolamine and 1750 parts by mass of ion-exchanged water, and heated to 100°C to obtain a premixed solution for dissolution. Next, 670 parts by mass of ammonium metatungstate (50% solution) as a tungsten raw material and 80 parts by mass of sorbitan trioleate as a molding lubricant were added to prepare a solution raw material.

[0141] Next, after mixing 3950 parts by mass of titanium dioxide, 300 parts by mass of alumina binder, 170 parts by mass of wollastonite fiber, and 300 parts by mass of methyl cellulose as a forming aid, the above-mentioned pre-mixed liquid was added and mixed. Refining to prepare raw material paste 2. The molar ratio (W / V) of vanadium atoms in the vanadium raw material to tungsten atoms in the tungsten raw material was 0.80.

[0142] Next, using the raw material paste 2, a honeycomb structure 10' was produced in...

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Abstract

Provided is a honeycomb structure which uses a TiO2 / V2O5 / WO3 catalyst, and which has excellent NOX conversion efficiency and thermal durability. This honeycomb structure is provided with a honeycomb unit in a shape in which multiple cells are partitioned by cell walls, said cells containing at least titanium oxide, vanadium oxide, tungsten oxide and an inorganic binder and extending in the longitudinal direction from one end surface to the other end surface, and is characterized in that the hydrogen consumption from vanadium reduction in temperature-programmed reduction with hydrogen (H2-TPR) is 0.6mmol or more per 1g of the honeycomb structure, and the molar ratio (W / V) of tungsten atoms to vanadium atoms is 0.8-1.2.

Description

technical field [0001] The present invention relates to a honeycomb structure as a denitration catalyst for removing nitrogen oxides (NOx) in exhaust gas. Background technique [0002] As a system for purifying NOx in exhaust gas, there is known an SCR (Selective Catalytic Reduction) system that reduces NOx to nitrogen and water using ammonia. As the catalyst used in this SCR system, vanadium pentoxide (V 2 o 5 ) has high denitrification performance and is used in titanium dioxide (TiO 2 ) is loaded with V 2 o 5 , Tungsten trioxide (WO 3 )s material. And, as such a titanium oxide loaded with V 2 o 5 、WO 3 Catalyst (hereinafter also referred to as "TiO 2 / V 2 o 5 / WO 3 catalyst"), for example disclosed in Patent Document 1. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2005-21780 Contents of the invention [0006] The problem to be solved by the invention [0007] However, using TiO as des...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/04
CPCB01J35/04B01J23/30B01D53/9418B01J37/0009B01D2255/20723B01D2255/20707C04B33/00B01D2255/20776C04B35/46C04B35/462C04B35/6303C04B2235/3201C04B2235/3217C04B2235/3218C04B2235/3232C04B2235/3234C04B2235/3239C04B2235/3258C04B2235/326C04B2235/3418C04B2235/3454C04B2235/349C04B2235/36C04B2235/522C04B2235/5224C04B2235/5228C04B2235/5232C04B2235/5244C04B35/80B01J35/56
Inventor 深泽康文吉村健
Owner IBIDEN CO LTD
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