The synthesis of SAPO-34 zeolite for an improved MTO performance: tuning the particle size and an insight into the formation mechanism

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

Abstract
Traditional SAPO-34 zeolites synthesized using trimethylamine (TEA) as organic templates have relatively large particle size and limited MTO performance. In this work, SAPO-34 plates have been successfully synthesized using TEA as templates with the presence of polyethylene glycol (PEG) as an assisted template. Two-step crystallization is utilized in the concentrated gel system to control the particle size in the range of 0.9–1.2 μm. The MTO catalysis shows that the as-synthesized SAPO-34 plates exhibit enhanced catalytic performance. At 99% conversion, it has a catalytic lifetime (326 min) that is eight times longer than that of the conventional sample and 80% selectivity for light olefins. Moreover, the NMR study reveals the distinct crystallization process of SAPO-34 in two gel systems. Different from silicon being the activated species and the crystal center in a normal gel system, the aluminophosphate framework is first generated and then silicon gradually enters to replace Al or P in the concentrated gel system.

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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