What is dealumination of zeolite?

Dealumination is a known post-synthesis method of removing aluminum from zeolite structure with the use of chemical agents or by hydrothermal treatment [6,26].

What is the composition of zeolites?

Zeolites are the aluminosilicate members of the family of microporous solids known as “molecular sieves”, and mainly consist of silicon, aluminum, oxygen, and have the general formula MxAlxSi1−xO2·yH2O where M is either a metal ion or H+.

What is the crystal structure of zeolite?

Zeolites are three-dimensional, microporous, crystalline solids with well-defined structures that contain aluminium, silicon, and oxygen in their regular framework; cations and water are located in the pores. The silicon and aluminium atoms are tetrahedrally coordinated with each other through shared oxygen atoms.

What are zeolite crystals?

Zeolites are a group of silicate minerals with unusual properties with industrial importance. They usually form beautiful well-formed crystals with pale colors, and are relatively soft and can be crushed and powdered. They are found in geologically young volcanic fields.

What are natural zeolites?

Natural zeolites are environmentally and economically acceptable hydrated aluminosilicate materials with exceptional ion-exchange and sorption properties. Their effectiveness in different technological processes depends on their physical-chemical properties that are tightly connected to their geological deposits.

How is zeolite formed?

Natural zeolites occur in mafic volcanic rocks as cavity fillings, probably as a result of deposition by fluids or vapours. In sedimentary rocks zeolites occur as alteration products of volcanic glass and serve as cementing material in detrital rocks; they also are found in chemical sedimentary rocks of marine origin.

What is a natural zeolite?

Natural zeolites are hydrated aluminosilicate frameworks with pores occupied by water, alkali, and alkaline earth-metal cations. Due to their unique 3D porous structure, these materials can acquire exceptional adsorption properties.

Which of the following structure is the framework of zeolite?

tetrahedra
A zeolite is a hydrated aluminosilicate mineral with a structure characterized by a framework of linked tetrahedra, each consisting of four oxygen atoms surrounding a silicon or aluminum cation.

What is zeolite and its uses?

Catalysis: Zeolites are extremely useful as catalysts for several important reactions involving organic molecules. The most important are cracking, isomerisation and hydrocarbon synthesis. Zeolites can promote a diverse range of catalytic reactions including acid-base and metal induced reactions.

What are uses of zeolite?

There are three main uses of zeolites in industry: catalysis, gas separation and ion exchange. Catalysis: Zeolites are extremely useful as catalysts for several important reactions involving organic molecules. The most important are cracking, isomerisation and hydrocarbon synthesis.