MOLDED PIECE CONTAINING ZEOLITE MATERIAL HAVING MFI FRAME STRUCTURE TYPE Russian patent published in 2023 - IPC C01B39/08 C01B39/38 B01J2/20 B01J3/04 B01J21/08 B01J29/40 B01J29/89 B01J35/10 

FIELD: chemical industry.

SUBSTANCE: used in the manufacture of adsorbents, absorbents, catalysts or their components in isomerization reactions, aldol condensation, the Prins reaction, for example in propene epoxidation reactions. The molded piece contains an MFI frame structure zeolite comprising hollow TS-1 exhibiting Type IV nitrogen adsorption/desorption, in which 98-100 wt.% are Ti, Si, O and H, with a Ti content of 1.3-2.1 wt.%, calculated as elemental Ti. The molded piece additionally contains a silicon dioxide binder with a zeolite to binder weight ratio, MFI:SiO₂, ranging from 1:1 to 5:1. The pore volume of this molded piece is 0.8-1.5 ml/g, determined by measuring porosity by mercury incorporation. Zeolite contains hollow cavities with a diameter of more than 5.5 Angstroms. First, a mixture containing a binder precursor and a zeolite is prepared and molded to form a molded piece precursor; water is added and the resulting mixture is treated under hydrothermal conditions at a temperature of 100-200°C in an autoclave, and then the water-treated precursor of the molded piece is calcined in a gas atmosphere to obtain this molded piece. The binder precursor is selected from silicic acid sol, colloidal silicon dioxide, wet or dry process silicon dioxide, or a mixture of two or more of them. Viscosity modifiers and/or mesopore-forming agents, such as water, alcohols, organic polymers, or mixtures thereof, can be added to the binder precursor-zeolite mixture. Selected organic polymers are celluloses or their derivatives, starches, polyalkylene oxides, polystyrenes, polyacrylates, polymethacrylates, polyolefins, polyamides, polyesters or mixtures of two or more of them. Forming can be accomplished by extrusion to produce a filament with a circular cross-section. After molding, the precursor of the molded product can be further dried in a gas atmosphere and calcined in a gas atmosphere at 450-530°C.

EFFECT: catalyst based on the resulting molded piece has improved selectivity towards propylene oxide, and the oxidizing agent based on the molded article exhibits low selectivity towards by-products and co-products epoxidation while having high selectivity towards propylene.

15 cl, 2 dwg, 4 tbl, 2 ex