Synthesis of ZSM-5/SAPO-34 zeolite composites from their catalytic properties in the MTO reaction

SAPO-34 zeolite Spec:
Mean size:1.5µm
Aperture:0.4nm
Specific surface area:570m2/g
Pore volume:0.278cm3/g

Abstract
ZSM-5/SAPO-34 zeolite composites were successfully synthesized by adding ZSM-5 into SAPO-34 synthetic gel under hydrothermal synthesis conditions, and SAPO-34 as a part of the composite zeolite was synthesized from LAPONITE® as the Si source. The presence of ZSM-5 in the synthetic gel affects the nucleation and crystal growth rate, and core–shell structured zeolite composites can be formed by adding an appropriate amount of ZSM-5. LAPONITE® itself contains Li and Mg atoms which were subsequently introduced into the framework of the SAPO-34 part in the composites via depolymerization–reorganization during the process of crystallization. Furthermore, the depolymerized LAPONITE® can be converted in situ into zeolitic precursors and act as crystalline seeds under hydrothermal conditions. Compared with the ZSM-5/SAPO-34 zeolite composites synthesized from tetraethylorthosilicate (TEOS) instead of LAPONITE® as the Si source, the ZSM-5/SAPO-34 composites synthesized from LAPONITE® exhibited higher selectivity to light olefins and longer lifetime in the MTO reaction. This work provides a convenient route to the synthesis of ZSM-5/SAPO-34 zeolite composites with excellent MTO performance.

Sapo-34 zeolite molecular sieve

The crystal structure of SAPO-34‚ a micro pore zeolite‚ is similar to that of chabazite and has a special water absorbing capacity and bronsted acidity. This can be used as an adsorbent‚ catalyst and catalyst support in applications with low carbon olefin transfer‚ auto gas purification‚ MTO reactions‚ etc.

Crystal structure of SAPO-34, which is a micro pore zeolite, is similar to chabazite, have special water absorbing capacity and bronsted acidity. So this type could be used as adsorbent, catalyst and catalyst support in low carbon olefin transfer, auto gas purification, MTO reactions, etc.

SAPO-34 zeolite as catalyst for MTO ( methanol to olefin)

Chemical formula: [Ca2+6 (H2O)40] [Al12Si24 O72]-CHA

Features and Applications: Used in Refining and Specialty Chemicals markets- shape selectibe catalyst, e.g. (MTO)methanol to olefin Environmental area - catalyst carrier of exhaust purification Drying, purification and seperation area.

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