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活性氧化铝和分子之间的区别Sieve

March 23, 2021Posted byMadhu

Thekey differencebetween activated alumina and molecular sieve is thatactivated alumina contains a considerably high number of pores, whereas molecular sieve has comparatively a low number of pores.

Activated alumina and molecular sieve are materials that are useful in absorbing water as adsorbents. These materials have a strongadsorptioncapacity for water vapour.

CONTENTS

1.Overview and Key Difference
2.What is Activated Alumina
3.What is Molecular Sieve
4.Side by Side Comparison – Activated Alumina vs Molecular Sieve in Tabular Form
5.Summary

What is Activated Alumina?

Activated alumina is a highly porous material made ofaluminum oxide. This material is manufactured through the dihydroxylation of aluminum hydroxide. The surface area of this material is very high, about 200 square meters per gram. Activated alumina is important as adesiccantthat can keep substances dry by absorbing water from surrounding air. Moreover, this material can be used as a filter of fluoride, arsenic and selenium in drinking water.

Activated alumina has a large surface-area-to-weight ratio. This is because this material has many “tunnel-like” pores.

Key Difference - Activated Alumina vs Molecular Sieve

Figure 01: Appearance of Activated Alumina

There are many applications of activated alumina, including catalyst applications, using as a desiccant, as a fluoride adsorbent, in vacuum systems, as a biomaterial, and in defluoridation. In catalyst applications, activated alumina is useful as a catalyst in polyethylene production, hydrogen peroxide production, etc. As a desiccant, activated alumina is useful for adsorption because the water in the air sticks to the alumina itself inside the pores. Then, the water molecules become trapped. In addition, this material is useful in removing fluoride from drinking water.

What is Molecular Sieve?

Molecular sieve is a porous material having pores with uniform sizes. The diameter of these pores is similar to the size of very small molecules. Therefore, large molecules cannot pass through these pores, and they are adsorbed, but smaller molecules can pass through these pores. We can measure the diameter of a molecular sieve using the unit Angstrom or nanometers.

活性氧化铝和分子之间的区别Sieve

Figure 02: Appearance of a Molecular Sieve

When a mixture of molecules is migrating through the stationary bed of porous and semi-solid substance (the sieve), the components having a high molecular weight tend to leave the bed first; then comes the successively smaller molecules. Therefore, these molecular sieves are useful in chromatography. Some types of molecular sieves are useful as desiccants.

Concerning the applications of molecular sieve material, we can use it in the petroleum industry for drying gas streams. We can use this substance to dry solvents which includes aggressive desiccants. Moreover, there are catalytic applications that can catalyze isomerization, alkylation, and epoxidation. In addition, we can use molecular sieves for the filtration of air supplies in breathing apparatus such as scuba divers and firefighters.

What is the Difference Between Activated Alumina and Molecular Sieve?

Activated alumina and molecular sieves are highly porous materials. Activated alumina is a highly porous material made of aluminum oxide while molecular sieve is a porous material having pores with uniform sizes. Therefore, the key difference between activated alumina and molecular sieve is that activated alumina contains a considerably high number of pores, whereas molecular sieve has comparatively a low number of pores.

Below is a summary of the difference between activated alumina and molecular sieve in tabular form.

活性氧化铝和分子之间的区别Sieve in Tabular Form

Summary – Activated Alumina vs Molecular Sieve

Activated alumina and molecular sieve are materials that are useful in absorbing water as adsorbents. The key difference between activated alumina and molecular sieve is that activated alumina contains a considerably high number of pores, whereas molecular sieve has comparatively a low number of pores.

Reference:

1. “Molecular Sieve.”Encyclopædia Britannica, Encyclopædia Britannica, Inc.,Available here.

Image Courtesy:

1. “Active Al2O3” By GOKLuLe 盧樂 – Own work(CC BY-SA 3.0)viaCommons Wikimedia
2. “Molecular Sieve5” By Psiĥedelisto – Own work (Public Domain) viaCommons Wikimedia

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Filed Under:Industrial Chemistry

About the Author:Madhu

月球是一个研究生在生物科学与BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry.

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