2results about How to "Realize shape control" patented technology

This invention discloses a gallium-silicon molecular sieve, its preparation method, and its application. The chemical composition of the gallium-silicon molecular sieve is SiO2·nGa2O3, where n is the molar ratio of Ga2O3 to SiO2, and the value of n ranges from 0.001 to 0.01. The morphology of the gallium-silicon molecular sieve is a coffin-like lamellar morphology, and its average thickness along the b-axis is 25-100 nm. The preparation method of the gallium-silicon molecular sieve includes the following steps: (1) mixing a silicon source, a template agent, a growth regulator, and water to prepare a seed crystal suspension; (2) mixing the silicon source, gallium source, template agent, water, growth regulator, and the seed crystal suspension to obtain an initial gel, which is then recrystallized to obtain the gallium-silicon molecular sieve. The molecular sieve provided by this invention is used as a catalyst in the alkylation reaction of benzene and methanol, exhibiting high benzene conversion rate and high selectivity for the target product.

The invention relates to the field of heterogeneous catalyst preparation, in particular to a Fischer-Tropsch synthesis catalyst, a preparation method thereof and a Fischer-Tropsch synthesis method. The catalyst comprises an alumina carrier with a fiber structure and Co3O4 nanoparticles dispersed in network gaps formed by the fiber structure, and the Co3O4 nanoparticles exist in the form of a Co3O4 nanoparticle aggregate; the mass ratio of the Co3O4 nanoparticles to the alumina carrier is 1: (3.3-5); in a hydrogen temperature programmed reduction H2-TPR test, the temperature corresponding to the highest value of the first reduction peak of the catalyst is 250-400 DEG C, and the integral area of the reduction peak corresponding to the temperature of 100-400 DEG C accounts for 50-70% of the total integral area of all the reduction peaks. The catalyst is used in a Fischer-Tropsch synthesis reaction, and the selectivity of by-product methane is reduced while a relatively high CO conversion rate is maintained.