Continuous-flow Synthesis of Submicron and Nano-zeolites in Capillary Microchannel Reactor

Continuous synthesis of NaA and Silicalite-1 submicron and nanoparticles was prepared in a capillary microchannel reactor from clear solutions.The X-ray diffraction(XRD),Transmission Electron Microscope(TEM) and Dynamic Light Scatter(DLS) measurements were used to investigate the effects of different synthesis parameters on the particle size distribution and morphology,including reaction temperature,aging time and residence time.It was indicated that smaller mean particle size and narrower particle size distribution of the products was obtained with lower reaction temperature,longer aging time and shorter residence time during the synthesis process.At the synthesis temperature of 343K,aging time of 72h and residence time of 5.8h,the NaA zeolite crystal with mean particle size of about 100nm was prepared.And at the synthesis temperature of 371K,aging time of 24h and residence time of 10h,the Silicalite-1 zeolite crystal with mean particle size of around 80nm was obtained.The present method offers a novel route for preparing submicro and nano zeolite particles.