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هيدريد الألومنيوم (Info)


هيدريد الألمنيوم مركب كيميائي له الصيغة AlH3 ، ويكون على شكل بلورات بيضاء.

الخواص

  • مركب هيدريد الألومنيوم غير ثابت، حيث يتفكك بتماسه مع الماء والهواء الرطب بشكل عنيف.
  • ينحل هيدريد الألومنيوم في الإيثر الإيثيلي مشكلا معقد إيثرات ثنائي إيثيل الألومنيوم
AlH3 + (C2H5)2O → H3Al.O(C2H5)2

يتفكك هذا المعقد بالتماس مع الماء بشكل ناشر للحرارة.

  • يتفاعل هيدريد الألومنيوم مع غاز ثنائي أكسيد الكربون عند درجات حرارة مرتفعة حيث يختزله إلى غاز الميثان مع تشكل أكسيد الألومنيوم حسب المعادلة:
4AlH3 + 3CO2 → 3CH4 + 2Al2O3

التحضير

يحضر مركب هيدريد الألومنيوم من تفاعل هيدريد الليثيوم مع كلوريد الألومنيوم في وسط من ثنائي إيثيل الإيثر.

3LiH + AlCl3 → AlH3 + 3LiCl

الاستخدامات

  • يستخدم كعامل اختزال في الكيمياء بشكل عام وكحفاز في تفاعلات البلمرة.
  • يستخدم من أجل تحضير هيدريد ألومنيوم الليثيوم بتفاعله مع هيدريد الليثيوم في وسط من الإيثر.
AlH3 + LiH → LiAlH4
Source: wikipedia.org
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