Synthesis of small particle-sized CoAPO-5 and CoAPO-20 by surfactant-assisted method

The small particle-sized molecular sieves CoAPO-5 and CoAPO-20 have been synthesized using surfactant-assisted method hydrothermally. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and ultraviolet visible spectrometer (UV-vis). The results show that the obtained CoAPO-5 and CoAPO-20 have AFI and SOD structure respectively. The CoAPO-5 are bundles of acicular crystal and its sizes vary from 0.1 × 2 μm to 0.1 × 5 μm and the CoAPO-20 show spheric morphology with size distribution about 300-800 nm. It is proved that the surfactant-assisted method is an effective route to synthesize small particle-sized molecular sieves.