【简答题】异丙苯在催化剂上脱烷基生成苯,如催化剂为球形,密度为 ρ P = 106 0 kg·m -3 ,空隙率 ε P =0.52 ,比表面积为 S g =350m 2 g -1 ,求在 500°C 和 101.33kPa ,异丙苯在微孔中的有效扩散系数,设催化剂的曲折因子 τ =3 ,异丙苯 − 苯的分子扩散系数 D AB =0.155cm 2 s -1 。
【简答题】阅读理解。 What's the coolest kind of transportation (交通) for middle school students back from winter holidays? A racing bike? A car? No, it's a special kind of shoes called Heelys (暴走鞋). Heelys look just ...