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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.2K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

4.7K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
4.7K
Ionic Radii03:10

Ionic Radii

33.8K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.8K
Ionic Crystal Structures02:42

Ionic Crystal Structures

17.7K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
17.7K
Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

55.6K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
55.6K
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
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Updated: Feb 11, 2026

Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids
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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

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イオン性液体および固体HF同等のアミン-ポリ ((フッ素フッ化水素) 複合体により,効率的な環境に優しいイソブタン-イソブチレンアルキル化が行われます.

George A Olah1, Thomas Mathew, Alain Goeppert

  • 1Donald P. and Katherine B. Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, USA. olah@usc.edu

Journal of the American Chemical Society
|April 21, 2005
PubMed
まとめ

固定されたフッ化水素 (HF) 複合体を用いた新しい"グリーン"触媒は,より安全で高オクタンのイソパラフィン-オレフィンアルキル化を提供します. これらのイオン性液体および固体触媒は,HF活性を維持しながら,揮発性HFから生じる環境的危険を軽減します.

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科学分野:

  • カタリシス カタリシス カタリシス
  • グリーン・ケミストリー 緑の化学
  • 石油精製石油を精製する

背景:

  • 伝統的なアルキル化プロセスは,無水性フッ化水素 (HF) のような危険で揮発性のある触媒に依存することが多い.
  • 環境リスクの最小化と安全性の向上は,炭化水素加工のための酸触媒における主要な課題です.
  • 揮発性が低下し,性能が同等または優れている代替触媒システムの開発は不可欠です.

研究 の 目的:

  • イソパラフィン-オレフィンアルキル化のための新しい固定されたポリ (フッ化水素) 触媒を調査する.
  • 液体および固体オニウムポリ (フッ化水素) 複合体のHF同等の触媒としての有効性を評価する.
  • これらの新しい"グリーン"触媒システムの環境的利益と触媒性能を評価する.

主な方法:

  • 様々なアミンおよび窒素を含むポリマーを使用して,液体および固体オニウムポリ (フッ化水素) 触媒の合成.
  • これらの触媒をイソパラフィン-オレフィンアルキル化反応,特にイソブタン-イソブチレンおよび2-ブテンアルキル化において試験する.
  • アルキレート収量とオクタン数 (RON) の分析.
  • 触媒の揮発性と環境への影響の評価.

主要な成果:

  • 高オクタンアルキラート (最大RON=94) の優れた収量を得るために,液体と固体の両方の触媒システムを用いた.
  • イモビライズされた触媒は,従来のHF触媒に匹敵する強力な触媒性能を示した.
  • ポリ (フッ素酸化水素) 複合体は,フリーHFと比較して揮発性が著しく低下し,環境上の危険を最小限に抑えました.

結論:

  • イオン性液体や固体複合体を含む,固定化されたポリ (フッ化水素) 触媒は,イソパラフィン-オレフィンアルキル化のための実行可能で"グリーン"な代替品です.
  • これらの新しい触媒システムは,HFの高い活性性を効果的に維持し,関連する環境リスクを大幅に軽減します.
  • この開発は,石油精製産業におけるより安全で持続可能な慣行に向けた有望な経路を提供します.