Preparation Of Nano-silica And Its Application In Supper Claus Catalytic Reaction

In this paper, nano-silica with surface area about 100-150m2/g and pore size about 20-30nm are produced by precipitation method, which can be substituted for the gas made silica as catalyst support. X-ray diffraction, fourier transform infrared spectroscopy, transmission electron microscope and N2 adsorption are used to systematically characterize the properties of the products, and micro reactor is used to evaluated the catalytic performance of the catalyst. The research contents are as follows:Silica nanoparticles were prepared using sodium silicate as silica source, and we studied the effect of surfactant concentration, aging temperature and calcination temperature on the topography and pore structure of the product. Pore structure of the product can be effectively regulated by changing the parameters above, which makes the product candidate as catalyst support.Silica nanoparticles were synthesized from water-glass. Effect of surfactant type, surfactant concentration and calcination temperature on the product were studied. The research shows that surfactant play limited role while hydrothermal temperature has great influence on changing pore structure of the product. Silica can meet to application demand with hydrothermal modification.Taking cost into consideration, we carried out enlargement experiment using sodium silicate as silica source. Sample synthesized in our lab have larger pore size and pore volume compared with purchased ones, which favors fast transferring of sulfur and enhance the selectivity of the catalytic reaction.Catalyst was prepared using silica made in our lab and its catalytic activity was evaluated by micro reactor. The best technique factors were gained through the test. We conclude that catalyst prepared in our lab has better selectivity and sulfur productivity. As a result, we conclude that silica prepared by precipitation method can take the role of gas-made silica as super claus catalyst support.