505 resultados para Co2
Resumo:
Post-growth annealing was carried out on ZnO thin films grown by metal-organic chemical vapor deposition (MOCVD). The grain size of ZnO thin film increases monotonically with annealing temperature. The ZnO thin films were preferential to c-axis oriented after annealing as confirmed by Xray diffraction (XRD) measurements. Fourier transformation infrared transmission measurements showed that ZnO films grown at low temperature contains CO2 molecules after post-growth annealing. A two-step reaction process has been proposed to explain the formation mechanism of CO2, which indicates the possible chemical reaction processes during the metal-organic chemical vapor deposition of ZnO films.
Resumo:
CO2CO2CH4 <hr /> This paper introduces the advancement in research on replacement of CH4 from hydrate with CO2, and discusses the thermodynamic feasibility of replacment reaction between CO2 and CH4 hydrate, and points out that correct understanding of the replacement mechanism, new reaction techniques and higher reaction rate will be the key to commercial application.
Resumo:
The effects of five metal catalysts (K, Na, Ca, Mg, and Fe) on CO2 gasification reactivity of fir char were studied using thermal gravimetric analysis. The degree of carbonization, crystal structure and morphology of char samples was characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The CO2 gasification reactivity of fir char was improved through the addition of metal catalysts, in the order K>Na>Ca>Fe>Mg. XRD analysis indicated that Na and Ca improved the formation of crystal structure, and that Mg enhanced the degree of carbon structure ordering. SEM analysis showed that spotted activation centers were distributed on the surface of char samples impregnated with catalysts. Moreover, a loose flake structure was observed on the surface of both K-char and Na-char. Finally, the kinetic parameters of CO2 gasification of char samples were calculated mathematically.
Resumo:
CO_(2), CO_(2)CO_(2)3.780.4510~(-4)m l/min cm~(2)CO_(2), 519
Resumo:
CO2O3CO2O3 1. (60)CO2700µmol mol-1O2-. H2O2ASASODAPXMDARGRMDA70CO2 2. O380nmol mol-1O2-. H2O2 MDAASASODAPXGRASA30, 3. O3CO2O2-.H2O2SODAPXMDARGRO3CO2O3O3O2-.H2O2SODAPXMDARGRCO2CO2O3CO2O3 4.O3(50)O3CO2CO220CO2CO2CO2CO2O3
Resumo:
-CO2CO2 10.01~2HzCO2CO2 2CO2-1.5~1.0 mg CO2•m-2•s-1PARVPDCO2 35cmQ103.88~4.67 42003~2005GPP144113121502gC•m-2NEE-188-157-186gC•m-2200 52003~2005125211551326gC•m-280% 6