ZSM-5 zeolite molecular sieve and preparation method thereof

Abstract

The invention relates to a composite material containing ZSM-5 zeolite and a preparation method thereof. By taking kaolin, diatomite and modified kaolin as main raw materials, the preparation method comprises the following steps: A) roasting the kaolin at the temperature of 500-1000 DEG C for 0.5-10h to obtain a roasted material, adding water into the roasted material, uniformly stirring to prepare slurry, adding an alkali or acid, then reacting at the temperature of 60-90 DEG C for 30-120min and filtering to obtain the modified kaolin; B) adding water and one or more of a dispersant and a pore expanding agent into the material obtained in the step A), the kaolin and the diatomite, uniformly stirring to prepare slurry, forming by spray drying, and roasting the formed material at the temperature of 700-1000 DEG C for 0.5-6h to obtain the roasted material; C) adding sodium silicate, lye and zeolite into the material obtained in the step B), then putting into a crystallization reaction kettle, adjusting the final pH value of the slurry to 9.5-11.5 with an acid, performing hydrothermal crystallization at the temperature of 120-180 DEG C for 30-120h, filtering to remove mother liquor, washing the filtered material with deionized water, filtering and drying the filtered material to prepare a target product. The method has low preparation cost, the content of the ZSM-5 zeolite in the material is high, and the material has good wear resistance and has rich microporous and macroporous structures.

Description

technical field [0001] The invention relates to a composite material containing ZSM-5 zeolite and a preparation method thereof. The porous composite material containing ZSM-5 zeolite is prepared by using kaolin, diatomite and modified kaolin as main raw materials through a hydrothermal crystallization method. It belongs to the field of inorganic material synthesis. Background technique [0002] ZSM-5 zeolite molecular sieve was first developed by American Mobil Company in the early 1970s. It has a unique intersecting channel structure. The straight tube channel is elliptical, and the cross section of the transverse channel is approximately circular. The orifice sizes are slightly different, 0.54×0.56 nm and 0.51×0.57 nm, respectively. Because ZSM-5 zeolite molecular sieve has unique catalytic properties for reactions such as alkylation, isomerization, disproportionation, selective cracking and synthesis of gasoline from methanol, it is a kind of catalytic material that is...

AI Technical Summary

Problems solved by technology

But this invention is to add ZSM-5 zeolite seed crystal before forming into balls, which will cause the low utilization rate of ZSM-5 zeolite and the loss of ZSM-5 crystal form in its subsequent high-temperature roasting process due to molding