# US 5,348,987 A · NOx removal catalyst containing an inorganic fiber

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- Number: US 5,348,987 A
- Document ID: US5348987A
- Status: Granted
- Kind: A
- Application number: 08/003,446
- Filed: 1993-01-12
- Granted: 1994-09-20
- Earliest claimed: 1992-01-21
- Assignees: Babcock-Hitachi Kabushiki Kaisha
- Inventors: Yasuyoshi Kato; Kunihiko Konishi
- Web page: https://patentgrep.com/patent/US5348987A

## CPC

- B01J 37/0009: {Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01J 35/58: Fabrics or filaments
- B01J 21/06: Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 23/22: Vanadium
- B01J 23/24: Chromium, molybdenum or tungsten
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

NOx removal catalyst can be obtained by kneading various kinds of inorganic fibers and water containing a surfactant to make a pulp-like substance, adding a catalytic component thereto and then further kneading the resultant mixture to prepare a catalyst paste. The thus obtained catalyst paste is shaped into a honeycomb-like, plate-like or column-like form according conventional various molding methods, and then dried and calcined for use. Instead of the above catalytic components; catalytic carriers such as titanium, zeolite, zirconia and the like may be shaped and calcined in the same manner and used for carrying a catalytic component. A particularly high performance and strength can be obtained with good result when a composition produced by calcining a molybdenum (Mo), vanadium (V) or tungsten (W) compound born on titanium oxide at 400.degree. to 700.degree. C. is used.

## Claims

### Claim 1

A process for producing a NOx removal catalyst containing an inorganic fiber, which comprises:
kneading water containing a surfactant and a hydrophobic inorganic fiber until the hydrophobic nature of the inorganic fiber is changed to hydrophilic, to disperse the fiber in a pulp-like admixture; and then
adding a catalytic component to said pulp-like admixture and further kneading the resultant mixture to make a uniform dispersion of said fiber in a paste-like mixture and shaping the paste-like mixture to obtain a shaped catalytic material.

### Claim 2 (depends on 1)

A process for producing the NOx removal, catalyst containing an inorganic fiber as set forth in claim 1, in which said inorganic fiber is a silica-alumina-based fiber or a non-alkali glass fiber, and said surfactant is methyl cellulose, alkyl sodium sulfonate or polyvinyl alcohol.

### Claim 3

A process for producing a NOx removal catalyst containing an inorganic fiber, which comprises:
kneading water containing a surfactant and a hydrophobic inorganic fiber until the hydrophobic nature of the inorganic fiber is changed to hydrophilic, to disperse the fiber in a pulp-like admixture;
adding a catalytic carrier substance to said pulp-like admixture;
further kneading the resultant mixture to make an uniform dispersion of said fiber in a paste-like mixture;
then shaping the paste-like mixture to obtain a shaped catalytic material, drying and calcining the mixture; and
then adding a catalytically active component to the mixture to obtain a shaped, supported catalyst.

### Claim 4 (depends on 3)

A process for producing the NOx removal catalyst containing an inorganic fiber as set forth in claim 3, in which said inorganic fiber is a silica-alumina-based fiber or a non-alkali glass fiber, and said surfactant is methyl cellulose, alkyl sodium sulfonate or polyvinyl alcohol.