Designed synthesis of TS-1 crystals with controllable b-oriented length

Area of Science:

• Materials Science
• Catalysis
• Adsorption Science

Background:

• Titanium silicalite-1 (TS-1) is a versatile microporous material with applications in catalysis and adsorption.
• Controlling the morphology of TS-1 crystals is crucial for tailoring their performance.
• Previous studies have explored TS-1 synthesis, but targeted control over morphology for specific applications remains an area of interest.

Purpose of the Study:

• To rationally synthesize TS-1 crystals with controllable b-oriented length, specifically achieving sheet-like (TS-1-S) and chain-like (TS-1-C) morphologies.
• To investigate the catalytic activity of the synthesized TS-1 morphologies in the Beckmann rearrangement of cyclohexanone oxime.
• To evaluate the adsorptive selectivity of the synthesized TS-1 morphologies for para-xylene.

Main Methods:

• Synthesis of TS-1 crystals using titanosilicate gels with the addition of organic additives, including urea and a fluorinated surfactant (FC-4).
• Morphological characterization of the synthesized TS-1 crystals to confirm sheet-like (TS-1-S) and chain-like (TS-1-C) structures.
• Catalytic testing of TS-1-S samples for the Beckmann rearrangement of cyclohexanone oxime.
• Adsorptive measurements of TS-1-C samples for para-xylene to determine selectivity.

Main Results:

• Successfully synthesized TS-1 crystals with distinct sheet-like (TS-1-S) and chain-like (TS-1-C) morphologies by controlling additives during synthesis.
• TS-1-S samples demonstrated high activity in the Beckmann rearrangement of cyclohexanone oxime, indicating superior catalytic performance.
• TS-1-C samples exhibited selective adsorption capabilities for para-xylene, highlighting their potential in separation processes.

Conclusions:

• The rational synthesis approach using organic additives effectively controls TS-1 crystal morphology, leading to distinct properties.
• The sheet-like TS-1-S morphology is highly effective for catalytic applications like the Beckmann rearrangement.
• The chain-like TS-1-C morphology shows promise for selective adsorption applications, particularly for para-xylene separation.