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Synthesis of nanostructured ZnFe2O4 as a sorbent for H2S removal from syngas
Košťálová, Zuzana ; Nižňanský, Daniel (advisor) ; Vojtíšek, Pavel (referee)
The use of sorption properties of materials as sorbents for removing unwanted substances from gasified solid or liquid fuels (coal, oil, natural gas and biomass) in the heating plant industry seems to be more suitable than existing technology. In this diploma work, ZnFe2O4 is studied as a possible sorbent for the removal of H2S from gasified fuel. ZnFe2O4 has been prepared by various methods in the form of nanoparticles and nanocomposites. The prepared samples were characterized by powder X- ray diffraction, electron microscopy, BET measurement and thermal analysis. Further, the sorption activity of the samples was studied with regard to H2S. The results were evaluated with respect to the possible application of the prepared materials in heating plant industry. Keywords: ZnFe2O4, H2S absorption, sol-gel method, sol-gel auto-combustion method, SBA-15.
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Synthesis of nanostructured ZnFe2O4 as a sorbent for H2S removal from syngas
Košťálová, Zuzana ; Nižňanský, Daniel (advisor) ; Vojtíšek, Pavel (referee)
The use of sorption properties of materials as sorbents for removing unwanted substances from gasified solid or liquid fuels (coal, oil, natural gas and biomass) in the heating plant industry seems to be more suitable than existing technology. In this diploma work, ZnFe2O4 is studied as a possible sorbent for the removal of H2S from gasified fuel. ZnFe2O4 has been prepared by various methods in the form of nanoparticles and nanocomposites. The prepared samples were characterized by powder X- ray diffraction, electron microscopy, BET measurement and thermal analysis. Further, the sorption activity of the samples was studied with regard to H2S. The results were evaluated with respect to the possible application of the prepared materials in heating plant industry. Keywords: ZnFe2O4, H2S absorption, sol-gel method, sol-gel auto-combustion method, SBA-15.
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Causes of Failure of Nation - Building in South Vietnam
Košťálová, Zuzana ; Knotková, Vladimíra (advisor) ; Cibulková, Petra (referee)
The USA started nation-building in South Vietnam in 1954 after the Geneva Agreements. The USA wanted to build a state which would prevent expansion of communism to other states in Asia. This program failed and finally, in 1976 South Vietnam and North Vietnam were reunited into a single communist Vietnam. The goal of this bachelor thesis is to identify factors that caused nation-building in South Vietnam to fail. The causes of failure of nation-building are classified in three main levels - American policy in South Vietnam, South Vietnam and extern factors like the Democratic Republic of Vietnam, Soviet Union and People's Republic of China.
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