ХЕМОСОРБЦІЙНО-КАТАЛІТИЧНІ ВЛАСТИВОСТІ КОМПОЗИЦІЙ НА ОСНОВІ ФЕРУМ(ІІІ) ХЛОРИДУ ТА ПРИРОДНИХ СОРБЕНТІВ УКРАЇНИ В РЕАКЦІЇ ДІОКСИДУ СУЛЬФУРУ З КИСНЕМ ПОВІТРЯ

Sulfur dioxide is one of the most common toxic atmospheric pollutants that enters the air as a result of both natural and anthropogenic processes. Common technologies for its removal are based on adsorption processes using natural, synthetic zeolites, activated carbon, carbon materials, as well as chemisorption with the participation of metal oxides. Accumulated literature data indicate the ability of 3d-metal compounds to catalyze the oxidation of SO2 both in solution and in a droplet. However, dissolved metal complex catalysts for the oxidation of SO2 have limited application in air purification practice. The use of metal complex compounds fixed on solid supports is considered a promising direction, however, their activity in interaction with SO2 has not been studied sufficiently. The aim of our work is to evaluate the protective and sorption properties of chemisorption-catalytic compositions based on іron(III) chloride, fixed on carriers of various origins in the process of air purification from sulfur dioxide at its concentration in the air of 15 MPC (150 mg/m3). In the work, samples of natural minerals of various origins were used as a sorbent for sulfur dioxide and a carrier for compositions based on іron(III) chloride-zeolites, layered aluminosilicates and dispersed silicas. It was established that the natural sorbents used in the work are not real minerals and are characterized by a complex phase composition. In natural clinoptilolite, in addition to the dominant phase of clinoptilolite (> 70%), impurity phases are contained a-quartz, mordenite, hematite; in natural bentonite, along with the main phase of montmorillonite, contains calcite, α-quartz, and amorphous SiO2 in varying amounts; while tripoli is a crystalline mineral containing four main phases – α-SiO2, α-tridymite, β-cristobalite and α-cristobalite. It was found that the effectiveness of chemisorption-catalytic compositions based on іron(III) chloride in the process of absorbing sulfur dioxide depends on the concentration of FeCl3 and the nature of the carrier.