What is X type zeolite?
Zeolite X, together with zeolite Y, belongs to the family of aluminosilicate molecular sieves with a faujasite-type structure (FAU). It is characterized by the formula |(Ca, Mg, Na2)29 (H2O)240| [Al58Si134O384]– FAU (International zeolite association (IZA)).
Are there different types of zeolite?
There are nearly 50 different types of zeolites (clinoptilolite, chabazite, phillipsite, mordenite, etc.) with varying physical and chemical properties.
What is 4A zeolite?
4A Zeolite is a hydrated silicate of aluminum and either sodium or calcium—or both. Zeolite in its natural or artificial form has an extensive application in water softening, as a detergent builder, and a cracking catalyst.
What is your zeolite?
Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside. They are often also referred to as molecular sieves.
What is the life of zeolite?
Both freshly prepared and steamed MFI zeolite catalysts have been tested for service life. It has been shown that the zeolite cycle length is increased from 7 to 60 days by steaming. In contrast, comparative testing under mild conditions at 300°С has demonstrated low on-stream stability of the catalyst after steaming.
What is life of zeolite?
What is the difference between X zeolite and Y zeolites?
In X zeolites that ratio is between 2 and 3, while in Y zeolites it is 3 or higher. The negative charges of the framework are balanced by the positive charges of cations in non-framework positions.
What is a hypothetical zeolite?
Hypothetical zeolites are combinatorial models of potential structures of the minerals known as zeolites. They are four-regular periodic graphs, with vertices representing the tetrahedral atom (usually Si or Al) and the edges representing the bridging oxygen atoms.
What is the origin of the word zeolite?
The term zeolite was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt, who observed that rapidly heating a material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material.
What is the periodic graph of zeolites?
They are four-regular periodic graphs, with vertices representing the tetrahedral atom (usually Si or Al) and the edges representing the bridging oxygen atoms. Alternatively, by ignoring the tetrahedral atoms, zeolites can be represented by a six-valent periodic graph of oxygen atoms, with each O-O edge defining an edge of a tetrahedron.