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2 2020

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Płaski filtr ceramiczny – nowe rozwiązanie

Lipowska Barbara, Mróz Andrzej, Psiuk Bronisław, Śliwa Andrzej, Czechowska Kinga

Materiały Ceramiczne

2020

T. 72, nr 2

102--110

Przeprowadzono badania nad opracowaniem sposobu otrzymywania płaskiego filtra ceramicznego w postaci wielowarstwowej, dwustronnej membrany ceramicznej, charakteryzującego się tym, że jego wewnętrzną warstwę drenażową stanowi porowata, otwarta struktura, umożliwiająca uzyskanie wyższej wydajności filtracji z jednostki powierzchni filtracyjnej w porównaniu z rozwiązaniem obecnym na rynku. Na podstawie prób, wykonanych z wykorzystaniem znanych metod otrzymywania porowatych tworzyw z SiC, uzyskano prototypowy dysk filtracyjny. Przeprowadzone badania jego własności filtracyjnych potwierdziły, że w porównaniu z rozwiązaniem obecnym na rynku, umożliwia on uzyskanie wyższej wydajności filtracji z jednostki powierzchni oraz charakteryzuje się korzystniejszą zdolnością do regeneracji.

Research has been carried out on developing a method for obtaining a flat ceramic filter in the form of a multilayer, double-sided ceramic membrane with an internal drainage layer with a porous, open structure. This structure allows higher filtration efficiency per filter surface unit compared to a solution available on the market. Based on the conducted trials, using the commonly applied methods of obtaining porous products from silicon carbide, a proto-type filtration disc was developed. Investigations into its filtration properties confirmed that compared to the solution currently available on the market, it enables obtaining a much higher filtration efficiency and is characterized by a better ability to regenerate.

Chemical looping combustion related processes using solid oxygen carriers oxidized in CO2 atmosphere

Psiuk Bronisław, Wojsa Józef, Gerle Anna, Pochwała Tamara, Szade Jacek, Podwórny Jacek

Ecological Chemistry and Engineering. S

2020

Vol. 27, nr 4

579--589

Chemical-looping combustion (CLC) is an attractive process in CO2 capture, especially when solid oxygen carriers are used in it. The main requirements for oxygen-transporting materials include appropriate oxidation (in air) and reduction (in the presence of fuel) ability. In the paper a conceptual proposition for CLC-related processes with the application of solid oxygen carriers oxidized in both air and CO2 atmosphere has been presented. The possibility of the “looping” process on the same carriers using both CO2 and air atmosphere as an oxidizing agent allows us to enrich the concept of CLC and related processes by proposing a cyclic recirculation of the produced CO2 back to the installation. The oxidizing of solid oxygen carrier in a CO2 atmosphere is accompanied by CO emission from the plant. This toxic gas could be transformed into a useful product in any chemical process. It is possible to combine the looping processes with manufacturing of any appropriate morphological form of carbon in the cyclic CO disproportionation process. The combined process could lead to a lower CO2 emissions to the environment. SrTiO3 doped by Cr (STO:Cr) and a mixture of TiO2- and Ni-based compounds (TiO2-Ni) were investigated as oxygen transporting materials. The experiment methodology based on thermogravimetric, diffraction and spectroscopic studies was shown. Thermogravimetric (TGA) and Powder Diffraction (XRD) measurements were provided in-situ during a few cycles in a reducing (Ar+3 % H2) and oxidizing environment. Moreover, the STO:Cr powders were characterized ex-situ by the X-ray Photoelectron Spectroscopy (XPS) method. It was found that in tested conditions the cyclic process of the investigated powders’ oxidation and reduction is possible. Satisfactory results considering the oxygen transport capacity was obtained for the TiO2-Ni sample.