CONTROLLED ALKALINE TREATMENTS ON MOLECULAR SIEVES Russian patent published in 2022 - IPC C01B39/02 C01B39/24 C01B39/38 C01B39/46 C01B39/54 B01J29/40 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a method for performing controlled alkaline treatments of inorganic porous solid particles, in particular to a method for increasing the meso-porosity of zeolite, which consists of one treatment followed by a solid separation stage, such as a filtration stage, zeolite treated by the specified method, a method for preparing a technical catalyst, and the use of treated zeolite or a technical catalyst prepared using the specified method in catalysis processes or in adsorption or ion exchange processes. The method for increasing the meso-porosity of zeolite includes stages of: a) preparation of zeolite in the amount m_s; b) preparation of a base in the total amount m_b,total; and c) contact and interaction of this zeolite with the base in the amount of m_b(t) in an aqueous solution at a temperature from a room temperature to 100°C and pH from at least 10 to at most 14, wherein the base is continuously added to zeolite for a period of time Δt for the total amount of the base m_b,total of at least 15 s, thereby obtaining treated zeolite. Moreover, the maximum value m_b,max/m_s of the amount of the base m_b(t) brought into contact with inorganic porous solid m_s at any time t at the stage c) is less than m_b,total/m_s, wherein the total amount of the base m_b,total is provided in the form of solid alkali or alkaline solution, and where the maximum value m_b,max of the amount of the base m_b(t) at any given time t at the stage c) is at most 0.75*m_b,total. The method for preparing a technical catalyst contains stages of: preparation of treated zeolite by the specified method; addition of one or more additional ingredients to form a mixture, and molding of this mixture into a macroscopic mold in order to obtain a technical catalyst.

EFFECT: development of an efficient process leading to excellent physicochemical and catalytic properties and not adversely affecting the size of particles and crystals.

16 cl, 5 tbl, 41 ex, 11 dwg