JP6053363B2 - 触媒構造 - Google Patents
触媒構造 Download PDFInfo
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- JP6053363B2 JP6053363B2 JP2012159827A JP2012159827A JP6053363B2 JP 6053363 B2 JP6053363 B2 JP 6053363B2 JP 2012159827 A JP2012159827 A JP 2012159827A JP 2012159827 A JP2012159827 A JP 2012159827A JP 6053363 B2 JP6053363 B2 JP 6053363B2
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- catalyst
- flat plate
- lead
- gas
- exhaust gas
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- 239000003054 catalyst Substances 0.000 title claims description 156
- 238000003756 stirring Methods 0.000 claims description 60
- 238000005452 bending Methods 0.000 claims description 15
- 125000006850 spacer group Chemical group 0.000 claims description 14
- 230000003197 catalytic effect Effects 0.000 claims description 9
- 238000013019 agitation Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 98
- 230000000694 effects Effects 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 18
- 239000012784 inorganic fiber Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/28—Molybdenum
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
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- B01D53/8631—Processes characterised by a specific device
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/88—Handling or mounting catalysts
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- B01J37/02—Impregnation, coating or precipitation
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
- B01J2219/322—Basic shape of the elements
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- B01J2219/32237—Sheets comprising apertures or perforations
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- B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
- B01J2219/324—Composition or microstructure of the elements
- B01J2219/32466—Composition or microstructure of the elements comprising catalytically active material
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- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/30—Honeycomb supports characterised by their structural details
- F01N2330/38—Honeycomb supports characterised by their structural details flow channels with means to enhance flow mixing,(e.g. protrusions or projections)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/30—Honeycomb supports characterised by their structural details
- F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
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- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
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- Exhaust Gas After Treatment (AREA)
Description
酸化チタン粉末(比表面積:300mm2/g、SO4含有量:3.4wt%)13.5kgに、パラモリブデン酸アンモン((NH4)6・Mo7O24・4H2O)1.7kg、メタバナジン酸アンモニウム(NH4VO3)1.3kg、蓚酸1.7kgを添加し、水を加えながらニーダで1時間混練して水分約34wt%のペーストにした。このペーストに、カオリン系セラミック繊維2.3kgを加えて、さらに混練した。このペーストを、SUS430製メタルラス基板(幅490mm、厚さ0.15mm)のラス目間及び表面に、ローラプレスを用いて塗布して平板とし、厚さ約0.7mmの板状の触媒エレメント(平板部)を得た。この触媒エレメントに、プレス機を用いて、図11に示すように、波型のスペーサ2を形成した後、長さ600mm、幅150mmに切断し、スペーサ2を含む触媒エレメントを得た。そして、図12に示すように、触媒エレメント(図11)を積層体にして、金属製の外枠5の中に入れた後、積層体の上から加圧しながら蓋をし、積層触媒構造(150mm角(高さ150mm−幅150mm)、長さ600mm)を得た。積層触媒構造を24時間風乾した後、空気を流しながら500℃で2時間焼成したものを比較例1とした。
図13に示すように、タガネを用いて、上記の触媒エレメント(図11)に対し、長さ方向に約50mm間隔で打ち起こし加工を施し、高さ約1.5mm−幅約25mmの堰状突起40を含む触媒エレメントを得た。そして、図12に示すように、触媒エレメント(図13)を積層した積層触媒構造を、比較例2とした。
図14に示すように、上記の触媒エレメント(図11)に、排ガスに対する触媒活性を有する成分を含浸した無機繊維(撹拌部3)を設けたものを実施例1とした。酸化チタン粉末(比表面積:300mm2/g、SO4含有量:3.4wt%)13.5kgに、パラモリブデン酸アンモン((NH4)6・Mo7O24・4H2O)1.7kg、メタバナジン酸アンモニウム(NH4VO3)1.3kg、蓚酸1.7kgを添加し、水を加えながらニーダで1時間混練した後、押し出し造粒機で3φの柱状に押し出したものを、流動層乾燥機で乾燥させて、500℃で2時間焼成し、さらにハンマーミルで微粉砕した触媒粉末を得た。この触媒粉末4kgに水6kgを加えて触媒スラリを調製した。この触媒スラリをカオリン系無機繊維バルク成形体(厚さ(高さ)3mm、1cm角(幅10mm−長さ10mm))に浸み込ませたものを、実施例1の無機繊維(撹拌部3)とした。図14に示すように、実施例1の無機繊維(撹拌部3)を触媒エレメント(図11)上に約50mm間隔で配置した。
図3に示すように、触媒エレメント(図11)に、加工用金型を用いて切り起こし加工を施し、切り込みを折り曲げて攪拌部(リード部)3を形成したものを実施例2とした。実施例2の攪拌部(リード部)3は、長さaを18mmとし、幅bを8mmとした。そして、図7に示すように、実施例2の撹拌部(リード部)3をガス流方向4に約50mm間隔で配置した触媒エレメントを積層体にし、図12に示すように、金属製の外枠5の中に入れた後、積層体の上から加圧しながら蓋をし、積層触媒構造を得た。積層触媒構造を24時間風乾した後、空気を流しながら500℃で2時間焼成したものを実施例2とした。この場合、図7に示すように、第1の平板部1に設けられたリード部33と、第2の平板部10に設けられたリード部34とが、ガス流方向4に交互に存在するように、触媒エレメントを積層した。また、第2の平板部10に設けられたリード部34と、第3の平板部11に設けられたリード部35とが、ガス流方向4に交互に存在するように、触媒エレメントを積層した。
実施例3は、実施例2の攪拌部(リード部)3の長さaを25mmとし、幅bを15mmとしたものである。
実施例4は、実施例2の攪拌部(リード部)3の長さaを20mmとし、幅bを10mmとしたものである。
実施例5は、図6に示すように、実施例2の攪拌部(リード部)3の折り曲げ方向を交互に反対方向にしたものである。この場合、図6に示すように、第1の平板部1及び第3の平板部11には、攪拌部(リード部)3が存在しないようになっている。
実施例6は、実施例2の撹拌部(リード部)3の間隔(約50mm)を、ガス流方向4に約100mmに変更したものである。
2 スペーサ
3,31−35 攪拌部(リード部)
5 外枠
30 開口部
Claims (7)
- 排ガスに対する触媒活性を有する成分を表面に担持した平板部と、前記排ガスが流れる方向に延在され、前記排ガスの流れに直交する方向に等間隔で前記平板部に配置された複数のスペーサとを有してなる触媒エレメントを複数枚備え、
複数の前記触媒エレメントは、前記スペーサを介して積層され、前記触媒エレメントの積層方向に隣り合う2つの前記平板部と、隣り合う2つの前記スペーサとにより形成されるガス流路に設けられ、前記排ガスを攪拌する攪拌部を有して形成され、
前記攪拌部は、前記各ガス流路の一方の前記平板部に形成された切り込みを折り曲げて、前記ガス流れ方向に設定間隔を空けて形成された複数のリード部と、前記リード部の切り込みにより形成された複数の開口部とを有し、
前記各リード部は、前記排ガスの流れに直交する方向に幅を有し、前記ガス流れ方向に対して略同一の方向に折り曲げて形成され、
隣り合う前記触媒エレメントは、前記リード部が前記排ガスの流れ方向に交互に存在するように配置されていることを特徴とする触媒構造。 - 前記リード部は、前記隣り合う2つの前記平板部の一方から他方の前記平板部に接触する位置まで形成されていることを特徴とする請求項1に記載の触媒構造。
- 積層方向に隣り合う前記触媒エレメントは、一方の前記触媒エレメントに形成された前記リード部が、他方の前記触媒エレメントの前記ガス流れ方向に隣り合う2つの前記リード部の間の平坦部に対応する位置に配置されていることを特徴とする請求項1又は2に記載の触媒構造。
- 前記リード部の長さは、隣り合う2つの前記触媒エレメントの間隔の5倍以上10倍以下であることを特徴とする請求項1乃至3の何れか1つに記載の触媒構造。
- 前記リード部の前記所定の角度は、7°以上30°以下であることを特徴とする請求項1乃至4の何れか1つに記載の触媒構造。
- 前記撹拌部は、前記排ガスが流れる方向に複数存在し、それぞれの間隔が30mm以上100mm以下であることを特徴とする請求項1乃至5の何れか1つに記載の触媒構造。
- 前記リード部の前記幅は、前記ガス流路の幅の1/5以上1/2以下であることを特徴とする請求項1乃至6の何れか1つに記載の触媒構造。
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