Abstract:

Magnetic titanium silicalite molecular sieve(NiFe₂O₄/TS-1) particles with a core/shell structure were prepared via the process of hydrothermal synthesis and solvent vaporation method using nanosized nickelferrite with spinel structure as nuclear. The samples were characterized with Fourier transform infrared spectroscope(FTIR), vibrating sample magnetometer(VSM) scanning electron microscope(SEM), transmission electron microscope(TEM) and X-ray diffractometer(XRD). The results show that the composite particles are sphere and have an even distribution, with an average size of about 100—150 nm in diameter. The activity of the composite particles was investigated for catalysis of cyclohexanone ammoximation, the experimental results show that the conversion of cyclohexanone can reach up to 98% and the selectivity of the product is higher than 97%.

Key words: Magnetic catalyst, Titanium silicalite molecular sieve, Core/shell structure