JP7181541B2 - 金担持カーボン触媒およびその製造方法 - Google Patents
金担持カーボン触媒およびその製造方法 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 28
- 229910052799 carbon Inorganic materials 0.000 title claims description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 109
- 229910052737 gold Inorganic materials 0.000 claims description 107
- 239000010931 gold Substances 0.000 claims description 107
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 62
- 239000010419 fine particle Substances 0.000 claims description 51
- 239000002245 particle Substances 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 33
- 239000006229 carbon black Substances 0.000 claims description 30
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 claims description 30
- 239000011859 microparticle Substances 0.000 claims description 20
- 239000012071 phase Substances 0.000 claims description 20
- ORTRWBYBJVGVQC-UHFFFAOYSA-N hexadecane-1-thiol Chemical compound CCCCCCCCCCCCCCCCS ORTRWBYBJVGVQC-UHFFFAOYSA-N 0.000 claims description 11
- 239000003960 organic solvent Substances 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000003495 polar organic solvent Substances 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000005191 phase separation Methods 0.000 claims description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 36
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000002776 aggregation Effects 0.000 description 9
- 239000002244 precipitate Substances 0.000 description 9
- 238000004220 aggregation Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- QBVXKDJEZKEASM-UHFFFAOYSA-M tetraoctylammonium bromide Chemical compound [Br-].CCCCCCCC[N+](CCCCCCCC)(CCCCCCCC)CCCCCCCC QBVXKDJEZKEASM-UHFFFAOYSA-M 0.000 description 5
- 125000000524 functional group Chemical group 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 4
- 239000012279 sodium borohydride Substances 0.000 description 4
- 229910000033 sodium borohydride Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000003917 TEM image Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- -1 gold ions Chemical class 0.000 description 2
- 239000003273 ketjen black Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004033 diameter control Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000002343 gold Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 125000000686 lactone group Chemical group 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- QJAOYSPHSNGHNC-UHFFFAOYSA-N octadecane-1-thiol Chemical compound CCCCCCCCCCCCCCCCCCS QJAOYSPHSNGHNC-UHFFFAOYSA-N 0.000 description 1
- GIDDQKKGAYONOU-UHFFFAOYSA-N octylazanium;bromide Chemical compound Br.CCCCCCCCN GIDDQKKGAYONOU-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010414 supernatant solution Substances 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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Description
加えて、金微粒子に配位したアルカンチオールは立体障害物となって触媒使用時の金微粒子の凝集を抑制し、触媒の機能低下を抑制し、高耐久化に寄与すると考える。
なお、取扱い時にカーボンブラックに吸湿される微量の水は、上記カーボンブラックをヘキサン中での超音波照射時に除去される。
塩化金酸(HAuCl4・4H2O)21gを純水10gに溶解した塩化金酸水溶液とテトラオクチルアンモニウムブロマイド(相関移動剤)42.9gをトルエン693gに溶解した溶液とを室温で混合・撹拌した。
TEM観察(加速電圧200kV、倍率100万倍)を行い、撮影した写真の金微粒子の粒子径を測り、平均粒子径および標準偏差を算出した。
金担持カーボン触媒1g当たりの、平均粒子径としての金微粒子数(A)と金微粒子に配位しているアルカンチオール分子数(B)を下式よりそれぞれ求め、金微粒子1個当たりのアルカンチオールの分子数(C=B/A)を算出した。その値(C)を用いて式3よりアルカンチオールの金粒子表面被覆率(D)を算出した。
式1 A=(触媒1g当たりの金担持量)÷{(平均粒径の金粒子1個の体積)÷(金原子
1個の体積)×197÷(6.02×1023)}
式2 B=X÷(アルカンチオール1モルの質量)×6.02×1023
X:金担持カーボン触媒1gの300℃で熱処理前後の質量減少量
式3 D=π(硫黄の原子半径)2×C÷(平均粒径の金粒子1個の表面積)×100
実施例1のドデカンチオール31.2mLをヘキサデカンチオール39.4mLに変更したことを除き、実施例1と同様の製造方法で実施例2の金担持カーボン触媒を得た。生成した金担持カーボン触媒の金担持率は10.5wt.% 、金微粒子の平均粒子径は1.4nm 、標準偏差0.55であった。配位したヘキサデカンチオールの金粒子表面被覆率は58%であった。
比較例1は、金微粒子処理工程を行わない以外は実施例1の方法でカーボンブラックに担持させ、金担持率7.6wt.%の金担持カーボン触媒を得た。
比較例2は、実施例2で得られた金担持カーボン触媒を200℃、1時間の熱処理でヘキサデカンチオールを蒸発させた平均粒子径1.6nmの金担持カーボン触媒を得た。
表1の比較例1におけるアルカンチオールの金粒子表面被覆率を式3で求めると100%以上の値が得られたが、100%と表記した。これは金微粒子処理工程を行わないことで、金微粒子表面に配位したアルカンチオールに余剰なアルカンチオールが絡みついたためと考えられる。
金担持カーボン触媒における金微粒子とカーボンブラック担体との密着強度を評価した。密着強度の評価は、ヘキサン中の金担持カーボンに、40kHzの超音波を30分間照射し、超音波照射の前後の金担持率を比較することにより行った。超音波照射後の金担持カーボン触媒はガラスフィルターろ過で回収した。
なお、各試料の金担持率は、金の質量分析値と金担持カーボン触媒の質量より求めた。
金担持カーボン触媒の使用中に進行する金微粒子の凝集を300℃、1時間加熱する加速試験で実施例1と比較例2を評価した。その結果を表3に示す。
比較例2は、金微粒子の凝集が進行し、加速試験後の平均粒子径が5.2nmと大きく増加したのに対し、ドデカンチオールが配位している実施例1は、平均粒子径が2.8nmと金微粒子の凝集を抑制していることがわかる。
Claims (2)
- ドデカンチオールまたはヘキサデカンチオールが被覆率10~70%で配位し、平均粒径1.0~1.5nmの金微粒子をカーボンブラックに担持した金担持カーボン触媒。
- 塩化金酸水溶液と相関移動剤を含む有機溶媒溶液を混合した後、液相分離して得られた有機溶媒溶液相にドデカンチオールまたはヘキサデカンチオールを混合し、その混合した溶液に還元剤を含む水溶液を混合し、前記ドデカンチオールまたはヘキサデカンチオールが配位した金微粒子を得る金微粒子生成工程と、
前記ドデカンチオールまたはヘキサデカンチオールが配位した金微粒子をヘキサンに分散させ、さらに、極性有機溶媒を加え混合した後、前記ドデカンチオールまたはヘキサデカンチオールが配位した金微粒子を遠心分離する一連の操作を複数回繰り返す金微粒子処理工程と、
前記金微粒子処理工程後の前記ドデカンチオールまたはヘキサデカンチオールが配位した金微粒子をヘキサンに分散させた溶液とカーボンブラックをヘキサンに分散させた溶液とを混合することで、前記ドデカンチオールまたはヘキサデカンチオールが配位した金微粒子をカーボンブラックに担持させる金微粒子担持工程と、
を含むことを特徴とする請求項1に記載の金担持カーボン触媒の製造方法。
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JP2004232017A (ja) | 2003-01-30 | 2004-08-19 | Mitsuboshi Belting Ltd | 金微粒子の粒径制御方法 |
WO2005120708A1 (ja) | 2004-06-11 | 2005-12-22 | Japan Advanced Institute Of Science And Technology | 触媒の製造方法 |
WO2011074606A1 (ja) | 2009-12-15 | 2011-06-23 | 公立大学法人大阪府立大学 | 金属ナノ粒子及び金属ナノ粒子の製造方法 |
JP2013089287A (ja) | 2011-10-13 | 2013-05-13 | Doshisha | 白金コアシェル触媒、その製造方法及びそれを用いた燃料電池 |
US20150167187A1 (en) | 2013-12-18 | 2015-06-18 | U.S. Department Of Energy | Methods and Use of Manipulating Au25 Charge State |
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KR101802644B1 (ko) * | 2016-04-06 | 2017-11-30 | 연세대학교 산학협력단 | 금 나노 클러스터와 금 나노 기반의 합금 클러스터를 이용한 이산화탄소의 전기화학적 전환 및 합성가스의 제조방법 |
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- 2021-11-08 US US18/039,569 patent/US20240001350A1/en active Pending
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JP2004232017A (ja) | 2003-01-30 | 2004-08-19 | Mitsuboshi Belting Ltd | 金微粒子の粒径制御方法 |
WO2005120708A1 (ja) | 2004-06-11 | 2005-12-22 | Japan Advanced Institute Of Science And Technology | 触媒の製造方法 |
WO2011074606A1 (ja) | 2009-12-15 | 2011-06-23 | 公立大学法人大阪府立大学 | 金属ナノ粒子及び金属ナノ粒子の製造方法 |
JP2013089287A (ja) | 2011-10-13 | 2013-05-13 | Doshisha | 白金コアシェル触媒、その製造方法及びそれを用いた燃料電池 |
US20150167187A1 (en) | 2013-12-18 | 2015-06-18 | U.S. Department Of Energy | Methods and Use of Manipulating Au25 Charge State |
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EP4257269A1 (en) | 2023-10-11 |
CN116801978A (zh) | 2023-09-22 |
WO2022118612A1 (ja) | 2022-06-09 |
KR20230124606A (ko) | 2023-08-25 |
US20240001350A1 (en) | 2024-01-04 |
JPWO2022118612A1 (ja) | 2022-06-09 |
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