Development of Catalyst-Sorbents for Simultaneous Removal of SO₂From Flue Gas by Low Temperature Ozone Oxidation

Abstract

One technological process employing ozone and heterogeneous catalyst-sorbents was proposed for removal of SO 2 from flue gas. The catalyst-sorbents were developed and tested especially for adsorption and oxidation of SO 2 . Alternative catalyst-supporters including γ -Al 2 O 3 , permutite, silica gel, activated carbon and diatomite combined with different metal oxides (MnO 2 , Cr 2 O 3 , Fe 2 O 3 , CuO, CoO and NiO) were evaluated and tested. It was found that γ -Al 2 O 3 doped with MnO 2 can be considered as removal-effective sorbent for adsorption and oxidation of SO 2 . The synergetic effect between ozone and catalyst was found to be dominated. Effects of catalyst preparation parameters like calcination temperature, metal loaded and reaction temperature, etc. were investigated based on the MnO 2 /Al 2 O 3 catalyst-sorbents. Results show that γ -Al 2 O 3 combined with 8% Mn, calcinated under 573 K and reacted at 413 K are the optimal parameters for removal of SO 2 . Extra NO in flue gas can slightly enhance the capture efficiency of SO 2 .

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

“…[99] or WO x [100], can be used in the desulphurization of gases and oils. Moreover, various catalyst-supporters including γ-Al 2 O 3 , permutite, silica gel, and activated carbon were evaluated and tested as a means of enhancing catalytic activity of metal oxides [98]. It was described therein that γ-Al 2 O 3 doped with MnO 2 can serve as a removal-effective sorbent for adsorption and oxidation of SO 2 .…”

Complex Nanomaterials in Catalysis for Chemically Significant Applications: From Synthesis and Hydrocarbon Processing to Renewable Energy Applications

“…e hydrogenation of these fragments is small enough to pass through the mesoporous catalyst shell [231]. e sorbents all perform better with metal oxides loaded than with blank/Al 2 O 3 , indicating that the selected metal oxides have some catalytic impact in the O 3 enriched atmosphere [345].…”

“…However, the rate of increase in outlet SO 2 following breakthrough is slow enough. Some factors (preparation factors and operating conditions) which could have affected the catalysts are (1) calcination temperature, (2) MnO 2 loaded, (3) reaction temperature, and (4) NO in the flue gas [345].…”

“…One of the critical reasons for catalyst deactivation will be a slight decrease in pore volume and surface area induced by the high-temperature calcination procedure. e aggregation of loaded metals caused by partial melting will also significantly damage the active sites on the catalyst-sorbent surface [345].…”