JP2021178307A - メタン燃焼触媒及びその製造方法、並びに燃焼排ガスの浄化方法 - Google Patents
メタン燃焼触媒及びその製造方法、並びに燃焼排ガスの浄化方法 Download PDFInfo
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- JP2021178307A JP2021178307A JP2020086355A JP2020086355A JP2021178307A JP 2021178307 A JP2021178307 A JP 2021178307A JP 2020086355 A JP2020086355 A JP 2020086355A JP 2020086355 A JP2020086355 A JP 2020086355A JP 2021178307 A JP2021178307 A JP 2021178307A
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- Prior art keywords
- platinum
- methane
- catalyst
- carrier
- iridium
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 256
- 239000003054 catalyst Substances 0.000 title claims abstract description 186
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 120
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims description 24
- 238000004140 cleaning Methods 0.000 title 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 317
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 131
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 65
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 64
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 58
- MUMZUERVLWJKNR-UHFFFAOYSA-N oxoplatinum Chemical class [Pt]=O MUMZUERVLWJKNR-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910003446 platinum oxide Inorganic materials 0.000 claims abstract description 54
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 54
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 claims abstract description 20
- 229910052815 sulfur oxide Inorganic materials 0.000 claims abstract description 20
- 238000001228 spectrum Methods 0.000 claims abstract description 13
- 238000010304 firing Methods 0.000 claims description 87
- 150000003057 platinum Chemical class 0.000 claims description 50
- 238000001035 drying Methods 0.000 claims description 48
- 239000012266 salt solution Substances 0.000 claims description 48
- 238000005470 impregnation Methods 0.000 claims description 39
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 238000011068 loading method Methods 0.000 claims description 18
- 150000002503 iridium Chemical class 0.000 claims description 14
- 239000008187 granular material Substances 0.000 claims 2
- 239000008188 pellet Substances 0.000 claims 1
- 239000003826 tablet Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 36
- 238000004458 analytical method Methods 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 12
- 229910019020 PtO2 Inorganic materials 0.000 abstract description 4
- YKIOKAURTKXMSB-UHFFFAOYSA-N adams's catalyst Chemical compound O=[Pt]=O YKIOKAURTKXMSB-UHFFFAOYSA-N 0.000 abstract description 4
- 238000011282 treatment Methods 0.000 description 41
- 230000000052 comparative effect Effects 0.000 description 33
- 239000007789 gas Substances 0.000 description 33
- 229910006404 SnO 2 Inorganic materials 0.000 description 30
- 238000012360 testing method Methods 0.000 description 18
- 239000002245 particle Substances 0.000 description 17
- 239000007864 aqueous solution Substances 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 10
- 229910000510 noble metal Inorganic materials 0.000 description 10
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 9
- 229910000457 iridium oxide Inorganic materials 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 8
- 230000001590 oxidative effect Effects 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 8
- 229910002835 Pt–Ir Inorganic materials 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
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- 230000000977 initiatory effect Effects 0.000 description 5
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- 230000009471 action Effects 0.000 description 4
- XKUTVNLXHINPAP-UHFFFAOYSA-N azane platinum Chemical compound N.[Pt] XKUTVNLXHINPAP-UHFFFAOYSA-N 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 231100000572 poisoning Toxicity 0.000 description 4
- 230000000607 poisoning effect Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 231100000614 poison Toxicity 0.000 description 3
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- 239000000126 substance Substances 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- HLMXWUYOTWZKHB-UHFFFAOYSA-N 2-aminoethanol;platinum Chemical compound [Pt].NCCO HLMXWUYOTWZKHB-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ZYSSNSIOLIJYRF-UHFFFAOYSA-H Cl[Ir](Cl)(Cl)(Cl)(Cl)Cl Chemical compound Cl[Ir](Cl)(Cl)(Cl)(Cl)Cl ZYSSNSIOLIJYRF-UHFFFAOYSA-H 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- -1 platinum salt Chemical class 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 238000005507 spraying Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 1
- CTUFHBVSYAEMLM-UHFFFAOYSA-N acetic acid;platinum Chemical compound [Pt].CC(O)=O.CC(O)=O CTUFHBVSYAEMLM-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- IUJMNDNTFMJNEL-UHFFFAOYSA-K iridium(3+);trihydroxide Chemical compound [OH-].[OH-].[OH-].[Ir+3] IUJMNDNTFMJNEL-UHFFFAOYSA-K 0.000 description 1
- GSNZLGXNWYUHMI-UHFFFAOYSA-N iridium(3+);trinitrate Chemical compound [Ir+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GSNZLGXNWYUHMI-UHFFFAOYSA-N 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000006263 metalation reaction Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- UYXRCZUOJAYSQR-UHFFFAOYSA-N nitric acid;platinum Chemical compound [Pt].O[N+]([O-])=O UYXRCZUOJAYSQR-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 description 1
- NWAHZABTSDUXMJ-UHFFFAOYSA-N platinum(2+);dinitrate Chemical compound [Pt+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O NWAHZABTSDUXMJ-UHFFFAOYSA-N 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- DANYXEHCMQHDNX-UHFFFAOYSA-K trichloroiridium Chemical compound Cl[Ir](Cl)Cl DANYXEHCMQHDNX-UHFFFAOYSA-K 0.000 description 1
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Abstract
Description
上記の通り、従来のPt/SnO2系触媒に対する本発明の特徴は、担持された白金の酸化状態にある。以下、この特徴について明らかにしつつ、本発明に係るメタン燃焼触媒を構成する白金及びイリジウム、担体について説明する。
本発明に係る触媒は、上記の通り、白金の酸化状態において特徴を有する。本発明では、白金の酸化状態をX線光電子分光分析(XPS)による分析結果に基づいて特定する。XPSは、分析対象を構成する原子について、結合状態の種類とそれぞれの結合状態が占める割合(存在比率)を分析可能な手法であることから、本発明で適用される。具体的には、触媒をXPSで分析したときに観測される白金4f(Pt4f)スペクトルに基づき、各結合状態に対応する結合エネルギーにおける検出強度から白金の酸化状態を特定する。ここで、白金4fスペクトルにおいては、金属Ptのピークは71.0eV〜72.0eVの範囲内に、PtOのピークは72.8eV〜73.2eVの範囲内に、PtO2のピークは74.6eV〜75.0eVの範囲内に発現する。白金の各状態の存在比率RPt、RPtO、RPtO2は、各状態のピーク面積から算出される。
本発明のメタン燃焼触媒において、イリジウムは耐久性向上のための助触媒として作用する。メタン燃焼触媒におけるイリジウムも酸化物の状態にある。そして、イリジウム酸化物は、硫黄酸化物によってメタル化した白金へ酸素を供給することで、白金の酸化状態を維持する機能を有する。本発明のメタン燃焼触媒では、イリジウムの酸化状態に関しては特に制限することはない。本発明者等の検討によれば、イリジウムの場合、担持したイリジウムの殆どが酸化されていることが確認されている。後述の通り、イリジウムの酸化に関しては、白金を白金酸化物にするための条件のような厳密な条件は不要である。
酸化スズ担体は、触媒粒子の分散した状態で保持するという担体本来の機能と共に、触媒粒子である白金(白金酸化物)にメタン燃焼の活性を付与する上で必須の構成である。また、上述のとおり、本発明者等は、酸化スズ担体は、イリジウムへの酸素供給作用を有すると考察している。そのため、酸化スズ担体は、イリジウム酸化物による触媒の耐久性維持においても重要な構成といえる。
次に、本発明に係る触媒の製造方法について説明する。本発明に係るメタン燃焼触媒は、酸化スズ担体に白金及びイリジウムを担持することで製造される。この点においては従来技術と同様であり、本発明の触媒の製造方法は基本的に従来法が適用できる。ここで、従来のメタン燃焼触媒としては、含浸法が適用される。含浸法は、担体に担持する貴金属塩(貴金属化合物)の溶液を含浸させた後、焼成熱処理を行い担体上に貴金属を析出させる公知の触媒製造方法である。
メタン燃焼触媒の形態に応じた酸化スズ担体の準備工程として、各種形態の酸化スズの調製や、支持体への酸化スズスラリーの塗布等を行うことができる。酸化スズの調製としては、比表面積の調整のための熱処理が挙げられる。この熱処理は、粉末状、粒状、顆粒状、ペレット状、タブレット状の酸化スズを大気中で450℃以上700℃以下の温度で焼成することが好ましい。また、メタン燃焼触媒をハニカム等の支持体に支持させる場合、酸化スズ粉末をスラリー化して支持体に塗布する。酸化スズスラリーは、上記熱処理した酸化スズ粉末に水や有機溶剤を分散媒とするバインダーを混合することで調製できる。酸化スズスラリーの支持体への塗布は、エアブロー、スプレー、ディッピング等各種の公知の方法が適用できる。
酸化スズ担体への白金及びイリジウムの担持は、各貴金属の貴金属塩溶液の含浸と焼成熱処理を経てなされる。本発明では、白金の担持とイリジウムの担持を別々に行うこととする。これは、イリジウムの担持に先立ち、白金(白金酸化物)を微細且つ分散した状態で担持させた後にイリジウムを担持することで、白金(白金酸化物)とイリジウムとが近接した状態が発現し易くなるためである。この点、従来法では、白金とイリジウムの混合溶液による同時担持を許容しているが、本発明において同時担持は採用されない。
本発明において、白金の担持工程は、微細な白金粒子を分散して担持すると共に、白金を高効率で白金酸化物にするために重要な工程である。上記の通り、本発明では、白金担持の際、目標担持量の白金を含む白金塩溶液よりも白金含有量が低い白金塩溶液を、目標担持量に到達するまで酸化スズ担体に複数回含浸させる(以下、この操作を分割担持と称することがある)。また、本発明では、分割担持における含浸毎に、所定条件の乾燥処理を行うことを要件とする。
酸化スズ担体に白金の担持と焼成を行った後、イリジウムの担持と焼成を行う。イリジウムの担持もイリジウム塩溶液の含浸によってなされるが(第2の担持工程)、白金の担持の場合と異なり、分割担持に拠らず一度の含浸処理で行なわれる。
以上説明した本発明に係るメタン燃焼触媒を適用するメタン燃焼方法は、基本的には従来法と同様となる。本発明に係るメタン燃焼方法における対象としては、メタンと共に硫黄酸化物を含む燃焼排ガスである。また、メタン及び硫黄酸化物の他、エタンやプロパン等の他の炭化水素や一酸化炭素、酸素、含酸素化合物、窒素酸化物などの可燃性成分が含まれていても差し支えない。
本実施形態に係るメタン燃焼触媒の製造工程は、以下の通りとした。市販の酸化スズ粉末を600℃で焼成した。そして、焼成後の酸化スズ粉末にバインダーとして市販のSnO2ゾルをボールミルで混合・粉砕して酸化スズスラリーを製造した。この酸化スズスラリーを市販のコージェライトハニカム(日本ガイシ株式会社製:φ25.4mm×50mmL)にエアブローで塗布して酸化スズ担体とした(酸化スズの比表面積:12.09m2/g)。このとき、エアブローの回数を調整して酸化スズ担体の質量を調整している。
本実施形態に係るメタン燃焼触媒の製造工程に対する比較例(比較例1)として、従来技術(特許文献2)を参照しつつ、乾燥工程及び焼成処理を、それぞれ基本製造工程よりも高い温度で行って触媒を製造した。本実施形態の基本製造工程に対し、分割担持(4回)を行いつつ、各回の含浸後の乾燥処理として175℃で3時間加熱した後に275℃で3時間加熱した。また、最後の乾燥処理後の焼成工程で550℃にて3時間加熱した。これらの乾燥処理及び焼成処理以外の白金担持工程は本実施形態の基本製造工程と同じとした。また、イリジウムの担持工程と焼成工程も基本製造工程と同様とした。白金及びイリジウムの担持量は、実施例1等と同じとした。
本実施形態に対するもう一つの比較例(比較例2)として、分割担持に依らずに白金を担持した触媒を製造した。白金及びイリジウムの担持量は、実施例1等と同じとした。この比較製造工程2では、本実施形態の基本製造工程に対し、分割担持をすることなく目標担持量の白金を含む白金塩溶液の全量を1回の操作で酸化スズ担体に含浸した。白金塩溶液の含浸後は、乾燥及び焼成を行った。乾燥処理では温度110℃で1時間加熱し、焼成処理は450℃で3時間加熱した。各処理における昇温速度は基本製造工程と同様とした。その後、基本製造工程と同様にしてイリジウムの担持工程と焼成工程と行った。
上記の各種製法で製造した各実施例・比較例のメタン燃焼触媒について、XPS分析を行い、白金酸化物の割合(RTO)を求めた。XPS分析にあたって、各触媒をメノウ乳鉢で粉砕して試料を調製し、下記条件でXPS分析を行った。XPS分析はサーベイスキャンとナロースキャンを行い、Pt4fスペクトルとIr4fスペクトルを得た。
・分析装置:Thermo Fisher Scientific社製 K-Alpha+
・照射X線:単結晶分光AlKα線
・X線スポット系:400μm
・中和電子銃:使用
・結合エネルギーの基準化:C−C、C−Hを2884.6eVとして基準化
次に、製造した各メタン燃焼触媒を用いて性能評価のための試験を行った。この評価試験では、図1の固定床型の反応装置を模した試験装置に各触媒をセットして試験ガスを流通させてメタン転化率を測定した。試験条件は、下記の通りとした。
・反応温度(触媒温度):400℃
・試験ガス組成
CH4:2000ppm
CO2:5%
O2:10%
H2O:10%
SO2:1ppm
N2:バランス
・空間速度(GHSV):80,000h-1
Claims (9)
- 触媒全体に対する白金の質量基準の担持量が、2.0質量%以上15.0質量%以下である請求項1記載のメタン燃焼触媒。
- 触媒全体に対するイリジウムの質量基準の担持量が、0.1質量%以上5.0質量%以下である請求項1又は請求項2記載のメタン燃焼触媒。
- 粒状、顆粒状、ペレット状、タブレット状のいずれかの形状である請求項1〜請求項3のいずれかに記載のメタン燃焼触媒。
- 板形状、筒形状、球形状、ハニカム形状のいずれかの形状の支持体に支持されてなる請求項1〜請求項3のいずれかに記載のメタン燃焼触媒。
- 請求項1〜請求項5のいずれかに記載のメタン燃焼触媒の製造方法であって、
酸化スズからなる担体に白金塩溶液を含浸させる第1の担持工程及び前記第1の担持工程後の担体を焼成する第1の焼成工程と、
前記第1の焼成工程後の担体にイリジウム塩溶液を含浸させる第2の担持工程及び前記第2の担持工程後の担体を焼成する第2の焼成工程と、を含み、
前記第1の担持工程は、前記担体に、目標担持量の白金を含む白金塩溶液よりも白金含有量が低い白金塩溶液を複数回含浸し、
前記複数回の含浸毎に、含浸後の担体を60℃以上150℃以下の温度で乾燥させることで、目標担持量の白金を含浸させる工程であり、
更に、前記第1の焼成工程の加熱温度を350℃以上500℃以下とするメタン燃焼触媒の製造方法。 - 第1の担持工程で、均等な白金含有量の白金塩溶液を複数回含浸させる請求項6記載のメタン燃焼触媒の製造方法。
- 第2の焼成工程の加熱温度を350℃以上500℃以下とする請求項6又は請求項7記載のメタン燃焼触媒の製造方法。
- 硫黄酸化物を含む燃焼排ガス中のメタンを酸化除去する燃焼排ガスの浄化方法において、
反応温度を340℃以上500℃以下とし、前記燃焼排ガスを請求項1〜請求項5のいずれかに記載のメタン燃焼触媒に接触させることを特徴とする燃焼排ガスの浄化方法。
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