CATALYTIC SYSTEM FOR HETEROGENEOUS REACTIONS Russian patent published in 2005 - IPC

FIELD: heterogeneous catalysts.

SUBSTANCE: catalytic system comprises (i) high-silica fibrous carrier characterized by ²⁹Si MNR spectrum, in which lines with chemical shifts -100±3 ppm (line Q³) and -110±3 ppm (line Q⁴) are present at ratio of integral intensities Q³/Q⁴ from 0.7 to 1.2; IR spectrum, in which absorption bands of hydroxyl groups with wave number ν=3620-3650 cm^-1 and half-width 65-75 cm^-1 are present; which carrier has specific surface S_Ar=0.5-30 m²/g as measured by BET method from thermal desorption of argon, surface area S_Na=10-250 m²/g as measured by alkali titration method, at S_Na/S_Ar ratio 5 to 30; and (ii) at least one active element. The system represents geometrically structured one constituted by microfibers with diameter 5-20 μm and additionally has active centers characterized in IR spectra of adsorbed ammonia by presence of an absorption band with wave numbers ν=1410-1440 cm^-1.

EFFECT: increased catalytic activity, resistance to deactivation, and selectivity.

3 cl, 7 ex