from : https://antenchem.com
Zeolite-based heterogeneous catalysts are used by industrial chemical companies in the interconversion of hydrocarbons and the alkylation of aromatic compounds.
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| ZSM-5 Structure |
A very good example is the zeolite ZSM-5. This zeolite, developed by Mobil Oil, is an aluminosilicate zeolite with a high silica and low alumininum content. Its structure is based on channels with insecting tunnels. The aluminium sites are very acidic. The substitution of Al3+in place of the tetrahedral Si4+ silca requires the presence of an added postive charge. When this is H+, the acidity of the zeolite is very high. The reaction and catalysis chemistry of the ZSM-5 is due to this acidity.
ZSM-5 Structure
The ZSM-5 zeolite catalyst is used in the petroleum industry for hydrocarbon interconversion.
An example use is in the isomerizations of xylene- from meta to para-xylene. The acidic zeolite promotes carbocation isomerizations. There are two suggested mechanisms for this type of isomerizations.
Firstly shape may play a role. Perhaps para-xylene has a shape which allows it to diffuse rapidly through the zeolite structure, whereas as meta-xylene takes longer to pass through the zeolite and thus has more opportunity to be converted into the para-xylene.
Secondly, is that the orientation of reactive intermediates within the zeolite channels favors specifically para-xylene.
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Other information from AntenChem is as below:
MagicMax® ZSM-5 powder is a high Mole Ratio of SiO2/Al2
O3 additive. Super XFocus® (a low-rare-earth SOx reduction additive) provide refiners with the most cost-effective solutions to reduce SOx emissions from their FCC units.Our current portfolio of FCC additives allows refiners to reduce SOx, NOx, and CO emissions from their FCC units, as well as lower sulfur content in gasoline.
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