题目内容
（请给出正确答案）
[单选题]
某种烃吸附能力很好，化学反应速度不快，决定这种烃的催化裂化速度快慢的关键是（）
A.化学反应
B. 吸附
C. 内扩散
D. 外扩散
提问人：网友mmmwar
发布时间：2022-01-06
如搜索结果不匹配，请 
A.化学反应
B.吸附
C.内扩散
D.外扩散
题目内容
（请给出正确答案）
您可能会需要：
安装简答题APP，拍照搜题省时又省心！
更多“某种烃吸附能力很好，化学反应速度不快，决定这种烃的催化裂化速…”相关的问题
第3题
分子筛显著特点Molecular sieve features：（）
A、具有很好的吸附选择性It has good adsorption selectivity
B、如用于脱水的3Å、4Å分子筛For example, 3A and 4A molecular sieves used for dehydration
C、3Å分子筛：只允许H2O（2.3-3.1Å）、CH4等直径小于3Å的分子进入孔道（不吸附C2+烃）3A molecular sieve: only H2O (2.3-3.1a), CH4 and other molecules with diameter less than 3A are allowed to enter the pore (C2+ hydrocarbon is not adsorbed)
D、4Å分子筛：只允许H2O（2.3-3.1Å）、CH4 、 C2H6 等小于4Å的分子进入孔道（不吸附C3+烃）4A molecular sieve: only H2O (2.3-3.1a), CH4, C2H6 and other molecules less than 4A are allowed to enter the pore (C3+ hydrocarbon is not adsorbed)
E、3Å、4Å分子筛有利于从烃类气体中选择性吸收水分，而5Å则允许各种直链烷烃进入孔道吸附，故用于脱水选择性较差。 Molecular sieves 3A and 4A are favorable for selective absorption of water from hydrocarbon gases, while 5A allow various straight-chain alkanes to enter channels for adsorption, so they are less selective for dehydration.
F、具有很高的吸附性能It has high adsorption properties
G、很低的水汽分压，高温、高气体线速度等较苛刻条件下，仍保持较高的湿容量（其内部比表面积600～1000m2/g，大于一般吸附剂）。Low partial pressure of water vapor, high temperature, high gas linear velocity and other harsh conditions, still maintain a high wet capacity (its internal specific surface area of 600 ~ 1000m2/g, greater than the general adsorbent)
H、湿容量随温度变化小，在较高温度下仍有高吸附能力，实际使用时虽然经过反复再生，仍可以基本保持不变。The moisture capacity changes little with the temperature, and it still has a high adsorption capacity at a higher temperature. In practical use, it can remain basically unchanged despite repeated regeneration.
I、具有很高的脱水能力，对天然气水露点可降至-98℃，适用于天然气深冷法轻烃回收与液化前深度脱水。It has a very high dehydration capacity, and the dew point of natural gas water can be reduced to -98℃, which is suitable for deep dehydration before natural gas cryogenic light hydrocarbon recovery and liquefaction.
