Aluminum oxide (Al2O3) is a compound formed from aluminum (Al) and oxygen (O). Aluminum chloride (AlCl3) is a compound formed from aluminum (Al) and chlorine (Cl). Aluminum hydroxide (Al(OH)3) is a compound formed from aluminum (Al), hydrogen (H), and oxygen (O). When all these compounds are combined, they can form various types of aluminum-based materials, such as Alumina (Al2O3) which is commonly used in the production of ceramics, refractories, and catalysts.