Yゼオライトで単一の金属原子サイト触媒を製造する一般的な戦略
Yiwei Liu1, Zhi Li1, Qiuying Yu2
1Department of Chemistry , Tsinghua University , Beijing 100084 , China.
Journal of the American Chemical Society
|May 24, 2019
まとめ
Yゼオライトの内部で 単一原子位触媒を 作り出す新しい方法を開発しました これらの新しいゼオライトベースの触媒は,n-ヘクサンのイソメリゼーションのような化学反応の性能を大幅に高めています.
科学分野:
- カタリシス
- 材料科学
- ナノテクノロジー
背景:
- ゼオライトを支える金属触媒は,高性能のアプリケーションに不可欠です.
- 孤立した単一原子部位を持つ触媒の開発は,反応性と選択性においてユニークな利点を提供します.
研究 の 目的:
- Yゼオライト (M-ISAS@Y) で単金属原子サイト触媒を製造するための新しい戦略を開発する.
- 重要な産業反応におけるこれらの触媒の有効性を実証する.
主な方法:
- 結晶化中にYゼオライトβケージに金属エタネジアミン複合体を局所的に閉じ込める.
- 隔離された単金属原子部位 (M-ISAS) を安定させるための後続的熱処理.
- M-ISAS@Yの構造性,多孔性,表面性に関する特徴
主要な成果:
- M-ISAS@Y触媒 (M = Pt, Pd, Ru, Rh, Co, Ni, Cu) をゼオライト骨格酸素で安定した単一の原子サイトで成功して合成した.
- M-ISAS@Y触媒は,優れたゼオライト結晶性,多孔性,および高い表面積を保持しました.
- Pt-ISAS@Yは,n-ヘクサンのイソメリゼーションにおいて優れた性能を示し,ナノ粒子よりも5倍高いターンオーバー周波数と98%以上の同位体選択性を達成しました.
結論:
- 開発された戦略は,先端のゼオライトベースの単一原子サイト触媒を合成するための簡単な経路を提供します.
- これらのM-ISAS@Y触媒は,様々な産業用触媒用途に非常に有望です.
- 方法論は,ゼオライトのフレームワーク内の金属のサイト隔離を正確に制御することを可能にします.
関連する概念動画
02:32Bonding in Metals
52.2K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.2K
02:37Metallic Solids
20.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.5K
03:06Alkali Metals
24.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
24.3K
02:51Metal-Ligand Bonds
24.1K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.1K
02:58Properties of Transition Metals
29.7K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.7K
01:33Atomic Structure
207.9K
Overview
207.9K