微孔性アルミシリケートで,12 , 12 , 8 リングの孔と孤立した8 リングのチャネル
Naoto Nakazawa1, Takuji Ikeda2, Norihito Hiyoshi2
1Division of Materials Science and Chemical Engineering, Yokohama National University , 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Journal of the American Chemical Society
|June 6, 2017
まとめ
研究者らは新しいアルミシリケートゼオライト (YNU-5) を開発し 独特の相互接続された 独立した毛穴チャンネルを特徴としています この頑丈な材料は 軽量オレフィン製造の 産業用触媒として有望です
科学分野:
- 材料科学と工学
- 触媒と分離科学
- ナノテクノロジーとゼオライト化学
背景:
- 複雑な孔構造を持つゼオライトの制御された合成は,高度な化学的変換,環境修復,エネルギー効率に不可欠です.
- 単一のフレームワーク内の多重で相互接続された孔の大きさのゼオライトの開発は,材料科学の長年の目標でした.
研究 の 目的:
- 新しいアルミシリケートゼオライトの合成と構造的特徴を報告する. YNU-5.
- ダイメチルエーテルとオレフィン反応の触媒としてのYNU-5の可能性を調査する.
主な方法:
- 簡単に手に入る材料を用いた従来の水熱合成
- 構造はX線による微分法で決定する.
- 酸処理による非発光によるSi/Al比の調整
主要な成果:
- YNU-5の合成が成功し,独立した直線8環のチャネルに沿って,12環と8環の孔を相互接続した最初のゼオライトです.
- ゼオライトのフレームワークは安定しており,制御可能なSi/Al比率は9から350までです.
- X線 difraksionは9つの独立した四面体で調整された原子を明らかにし,複雑で堅固な構造を示しました.
結論:
- YNU-5は独特で頑丈な孔構造を持ち,工業的に価値があります.
- 新しい構造的特徴と調整可能なSi/Al比は,プロピレンやブチレンなどの軽量オレフィン生産のための有望な触媒としてYNU-5を位置づけています.
関連する概念動画
01:19Ion Channels
68.1K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
68.1K
03:05Acid Strength and Molecular Structure
26.0K
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with...
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with...
26.0K
01:25Aquaporins
5.0K
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
5.0K
01:28Structures of Carboxylic Acid Derivatives
3.1K
Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
3.1K
01:09Multi-pass Transmembrane Proteins and β-barrels
4.3K
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
4.3K
01:22Bicarbonate-Carbonic Acid Buffer
7.1K
The carbonic acid-bicarbonate buffer system is critical for maintaining the body's pH balance. It operates on the equilibrium:
7.1K