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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.

Procesy chemiczne i elektrochemiczne w wybranych nowych technologiach gazu ziemnego

Warowny W., Siemek J.

Wiertnictwo, Nafta, Gaz

2007

T. 24, z. 2

915-927

W pracy przedstawiono podstawowe informacje dotyczące chemicznej konwersji gazu ziemnego, w tym reakcje konwersji metanu i rysunek z produktami konwersji gazu ziemnego. Opisano skrótowo kilka technologii dla gazu ziemnego, wśród nich: przetwórstwo gazu ziemnego na paliwa ciekłe (GTL), jego suchy reforming oraz (poprzez gaz syntezowy) produkcję wodoru, metanolu, eteru dwumetylowego (DME) i dodatków motoryzacyjnych. Dodatkowo podano elektrochemiczne procesy zachodzące w ogniwach paliwowych.

This paper contains basic information for chemical conversion of the natural gas, including reforming reactions of methane and picture with gathered reforming products of natural gas. Few new selected natural gas technologies have been shortly described, among them: gas to liquid (GTL), dry reforming, production (via synthesis gas) of the hydrogen, methanol, and dimethyl ether (DME) and some motor additions. Additionally, electrochemical processes for fuel cells have been given.