JP2005154268A - メソポーラスカーボンモレキュラーシーブ及びこれを使用した担持触媒 - Google Patents
メソポーラスカーボンモレキュラーシーブ及びこれを使用した担持触媒 Download PDFInfo
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- JP2005154268A JP2005154268A JP2004336733A JP2004336733A JP2005154268A JP 2005154268 A JP2005154268 A JP 2005154268A JP 2004336733 A JP2004336733 A JP 2004336733A JP 2004336733 A JP2004336733 A JP 2004336733A JP 2005154268 A JP2005154268 A JP 2005154268A
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- Prior art keywords
- molecular sieve
- mesoporous
- carbon
- catalyst
- poly
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Classifications
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- H01M4/90—Selection of catalytic material
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- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
【解決手段】 約500nm以下の平均一次粒子径、約3nmないし約6nmの細孔平均メソ孔径、及び約500ないし約2,000m2/gのBET表面積を有するメソポーラスカーボンモレキュラーシーブである。
【選択図】 図2
Description
前記メソポーラスカーボンモレキュラーシーブに分散、担持される触媒金属粒子とを含む担持触媒。
(b)前記炭素前駆体が含浸された鋳型を非酸化雰囲気下で加熱することによって、前記炭素前駆体を熱分解して、前記鋳型の細孔内にカーボンストラクチャーを形成する段階と;および
(c)前記鋳型をシリカ可溶性溶液で除去することにより、前記カーボンストラクチャーを単離する段階を含む、メソポーラスカーボンモレキュラーシーブの製造方法に関するものである。
メソポーラスシリカモレキュラーシーブの平均一次粒子径を調節するために、Na:Siの原子比が異なるケイ酸ナトリウム溶液を製造した。製造例1,2で製造されたケイ酸ナトリウム溶液中のケイ酸ナトリウムのNa:Si原子比は、それぞれ、1.5:1、及び2.5:1であった。
実施例1と比較例1のメソポーラスシリカモレキュラーシーブを製造するにあたり、P123高分子(BASF社)を蒸溜水に溶解させた後、製造例1,2のケイ酸ナトリウム溶液を、それぞれ、撹拌しながら添加した。この混合物に酢酸を添加した後、45℃で24時間加熱し、沈殿物を生成させた。この沈殿物を濾過して蒸溜水で洗浄した後、室温で真空オーブン中で24時間乾燥した。乾燥された沈殿物を550℃で10時間焼成した。
実施例2のメソポーラスカーボンモレキュラーシーブは、実施例1−1と同様にして得られたメソポーラスシリカモレキュラーシーブを鋳型として使用して製造した。
実施例3の担持触媒は、実施例2と同様にして得られたメソポーラスカーボンモレキュラーシーブを担体として使用した炭素担持白金触媒である。それらの製造過程は次の通りである。
実施例4の燃料電池は、実施例3の担持触媒を含有するカソード、PtRuブラック触媒を含有するアノード、及びナフィオン117(Nafion 117)電解質膜より構成されている。この時、カソードの白金含有量は、3mg/cm2であり、アノードのPtRu含有量は8mg/cm2であった。
実施例4及び比較例4、5の燃料電池の性能を次のような条件で測定した。燃料として2M濃度のメタノール水溶液、そして酸化剤として空気を使用し、作動温度は40℃であった。性能評価結果を表4に要約した。
Claims (8)
- 500nm以下の平均一次粒子径、3nm〜6nmの平均メソ孔径、及び500〜2,000m2/gのBET表面積を有する、担持触媒の担体として使われるメソポーラスカーボンモレキュラーシーブ。
- 水系反応媒質中でNaOH及びSiO2を反応させてケイ酸ナトリウムを形成する段階と、
水系反応媒質中で前記ケイ酸ナトリウム、ポリ(エチレングリコール)−ブロック−ポリ(プロピレングリコール)−ブロック−ポリ(エチレングリコール)及びpH調節剤を反応させて沈殿物を得る段階と、
前記沈殿物を乾燥、焼成し、メソポーラスシリカを得る段階とを含み、
前記ケイ酸ナトリウムの形成段階で、NaOH及びSiO2の量を相対的に調節することにより、形成されるケイ酸ナトリウムのNa:Siの原子比を調節し、
前記Na:Siの原子比を高めることによって、形成されるメソポーラスシリカの平均粒子径を減少させる、メソポーラスシリカの一次粒子径の調節方法。 - 水系反応媒質中で、Na:Siの原子比が1.5:1〜2.5:1であるケイ酸ナトリウム、ポリ(エチレングリコール)−ブロック−ポリ(プロピレングリコール)−ブロック−ポリ(エチレングリコール)及びpH調節剤を反応させて沈殿物を得る段階と、
前記沈殿物を乾燥、焼成する段階とを含む、平均一次粒子径が250nm以上700nm未満であるメソポーラスシリカモレキュラーシーブの製造方法。 - (a)平均一次粒子径が250nm以上700nm未満であるメソポーラスシリカからなる鋳型の細孔内に、炭素前駆体を充填する段階と、
(b)前記炭素前駆体が含浸された鋳型を非酸化雰囲気下で加熱することによって、前記炭素前駆体を熱分解して、前記鋳型の細孔内にカーボンストラクチャーを形成する段階と、
(c)前記鋳型をシリカ可溶性溶液で除去することにより、前記カーボンストラクチャーを単離する段階とを含む、メソポーラスカーボンモレキュラーシーブの製造方法。 - 500nm以下の平均一次粒子径、3nm〜6nmの平均メソ孔径、及び500〜2,000m2/gのBET表面積を有するメソポーラスカーボンモレキュラーシーブと、
前記メソポーラスカーボンモレキュラーシーブに分散、担持される触媒金属粒子とを含む担持触媒。 - 前記メソポーラスカーボンモレキュラーシーブの平均一次粒子径が250nm〜350nmである、請求項5に記載の担持触媒。
- 前記メソポーラスカーボンモレキュラーシーブのBET表面積が800〜1,500m2/gである、請求項5または6に記載の担持触媒。
- カソード、アノード及び前記カソードとアノードとの間に設けられた電解質膜を含み、前記カソード及びアノードのうち少なくとも一方が請求項5〜7のいずれか1項による担持触媒を含む、燃料電池。
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Also Published As
Publication number | Publication date |
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CN1636634A (zh) | 2005-07-13 |
CN100486704C (zh) | 2009-05-13 |
US7220697B2 (en) | 2007-05-22 |
US7402544B2 (en) | 2008-07-22 |
US20050129604A1 (en) | 2005-06-16 |
KR20050049153A (ko) | 2005-05-25 |
KR100708642B1 (ko) | 2007-04-18 |
US20070172721A1 (en) | 2007-07-26 |
JP4431027B2 (ja) | 2010-03-10 |
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