SSZ-87:ボロシリケートゼオライトで,異常に柔軟な10環の孔が開口があります
Stef Smeets1, Lynne B McCusker, Christian Baerlocher
1Laboratory of Crystallography, ETH Zurich , Vladimir-Prelog-Weg 5, Zurich CH-8093, Switzerland.
Journal of the American Chemical Society
|January 22, 2015
まとめ
ボロシリケートゼオライトSSZ-87の結晶構造は,X線粉の微分と回転電子微分を用いて決定した. 10輪で結ばれた大きなケージを特徴とする独特の毛穴構造は,カルシネーションとアルミニウム挿入を経て明らかになった.
科学分野:
- マテリアルサイエンス 材料科学
- クリスタログラフィーです.
- カタリシス カタリシス カタリシス
背景:
- ゼオライトは,触媒と分離に使用される重要な微孔性材料です.
- ゼオライトの構造を理解することは,その性能を最適化するための鍵です.
- ボロシリケートゼオライトSSZ-87の構造特性と潜在的な用途については,詳細な調査が必要である.
研究 の 目的:
- アース合成ボロシリケートゼオライトSSZ-87.の詳細な結晶構造を解明する.
- 焼却とアルミニウム挿入によるSSZ-87の構造変化を調査する.
- 判定された構造と観察された触媒特性との相関を図る.
主な方法:
- 単細胞と空間群の決定のための高解像度X線粉末 difraktion (XPD) です.
- 初期構造溶液のための回転電子微分法 (RED).
- 材料の変換を観察するために,カルシネーションとアルミニウム挿入後の構造分析.
主要な成果:
- SSZ-87のフレームワークトポロジーは,ITQ-52 (IFW) と同じであると特定されました.
- 構造指向剤 (SDA) とボロン原子の位置は,合成された材料で決定されました.
- カルシネーションは部分的なデボロン化をもたらし,その後のアルミニウム挿入は,より柔軟な毛孔システムを持つ,ボロンと欠陥のない素材をもたらしました.
結論:
- SSZ-87は,大きなケージが10のリングで相互接続されたユニークな構造を持っています.
- 材料の毛孔システムの柔軟性は,単一の10リングの窓と空白に起因する,カルシネーションとアルミニウム挿入で増加します.
- 構造的な洞察は,触媒アプリケーションにおけるSSZ-87のパフォーマンスを理解し,強化するための基礎を提供します.
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