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分子筛是具有一般分子大小的均匀微孔,根据其有效孔径可筛分大小不同的流体分子,这种物质包括天然及人工合成的沸石,碳分子筛、微孔玻璃等。()
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- · 有5位网友选择 错,占比62.5%
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分子筛效应——分子筛具有大小均一、排列整齐的许多微孔,分子有效直径小于孔径的气体分子可进入孔内,被吸附在内表面上,分子直径大于孔径的则不能进入,即相当于用筛子(固定网眼大小)把气体分子选一遍,分子筛亦由此得名。水的分子直径(3.2Å,2.76Å)比通常所用分子筛的孔径小。Effects of molecular sieve, molecular sieve size uniform, neat rows of many microporous molecular effective diameter less than the gas molecules can enter the hole of the aperture, be adsorbed on the surface, molecular diameter aperture cannot enter, which is equivalent to the gas molecules with sieve (fixed mesh size) to choose again, molecular sieve and hence the name. The molecular diameter of water (3.2a, 2.76a) is smaller than that of molecular sieves commonly used.
分子筛molecular sieve 多孔性的铝酸盐结晶,有天然的,如泡沸石,也有以Al2O3与SiO2为基料人工合成的。具有骨架结构的碱金属或碱土金属的硅铝酸盐晶体。Porous aluminate crystals, either natural, such as bubble zeolite, or synthetic, based on Al2O3 and SiO2. Silicate aluminate crystals of alkali or alkaline earth metals having a skeleton structure. 分子筛的晶体结构中有大量空腔,这些空腔由规则而均匀的其孔径为分子大小的通道相互联结着,因此能将大小不同的分子分离,是一种高效、高选择性的固体吸附剂。There are a large number of cavities in the crystal structure of molecular sieve, which are connected by regular and uniform channels with pore size of molecules, so it is an efficient and highly selective solid adsorbent that can separate molecules of different sizes.
A.大
B. 小
C. 相等
D. 不确定
A.两者的主要组分均为硅铝酸盐
B.在两种催化剂的表面,均存在B酸中心和L酸中心
C.分子筛催化剂具有更高的活性、选择性和稳定性
D.两者的孔结构相同,均具有稳定、孔径大小均一的微孔结构
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