| 摘要 |
<p>PURPOSE:A powder of activated alumina and carbon black and other ingredients are formed, dried and calcined in a gas stream containing oxygen to produce particles of activated alumina suitably used as a catalyst, because of its porocity. CONSTITUTION:A starting mateial containing an activated alumina powder such as gamma-alumina or a powdery precursor of activated alumina such as boehmite and carbon black is formed and dried. The carbon black is made 150-3,000Angstrom in particle sizes and 60-300ml/100g in DBP adsorption. The amount of the carbon black is 5-120wt% based on the alumina. When necessary, water and an auxiliary forming agent is added thereto. Then, the formed alumina is calcined in a gas stream containing oxygen at a temperature exceeding 500 deg.C usually for 1hr to 1 day. Thus, a formed activated alumina with high mechanical strength, wearing resistance, large surface area and large void volume is produced.</p> |
