Thermal Behavior of Raw Oil Shale and Its Components

Abstract

In this study, the thermal behavior of dawsonite, nahcolite, quartz, dolomite, albite, illite, analcime, kerogen and raw oil shale samples is discussed. Thermal Gravimetric Analysis (TGA), Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Differential Scanning Calorimetry (DSC) were used to study the thermal properties of the samples. The DSC dynamic experiments were performed in CO 2 and N 2 atmospheres. The influence of purge gases on the thermal decomposition of kerogen, dawsonite and nahcolite was investigated. In the DSC experiments, the heating rate did not change the decomposition mechanism of both dawsonite and nahcolite and the Tp (the sample temperature at which the maximum deflection in the DSC curve is recorded) of dawsonite and nahcolite could be moved to higher temperatures by purging CO 2 .

A Study on Surface Modification Characteristics and Charge–Discharge Mechanism of Natural Serpentinite Ore Secondary Battery

“…This phenomenon suggests that the Fe source for forming pyrite is Fe 3 O 4 near the serpentine crystals rather than ferrous iron doping to serpentine. As mentioned above, it confirmed that the sulfidation layer was composed of pyrite and deduced the pyrite formation reactions Equations ( 4)-( 9) as follows [18,[20][21][22][23][24][25]:…”

Long-Time-Period, Low-Temperature Reactions of Green River Oil Shale

“…At the reaction temperature of 320 °C, no decomposition of dolomite or calcite would be expected, and prominent dolomite peaks were observed. The long time at 320 °C was sufficient to decompose the dawsonite despite the significant pressures of H 2 O and CO 2 , which would be expected to inhibit dawsonite decomposition. ,− However, there was a big difference in the intensity ratio of the two major peaks, with the lowest-conversion THF-insolubles having a lower ratio of plagioclase to calcite plus dolomite. (The XRD analysis of the THF-insolubles from the lowest-conversion 320 °C CO reaction also showed a low ratio of plagioclase to calcite plus dolomite.)…”

“…This suggests that the H 2 O-soluble alkaline material (and neutral H 2 O-solubles) was at least in part generated during the reaction, and one possible mechanism for the formation of alkaline H 2 O-solubles would be the decomposition of dawsonite. This will take place in the temperature range of the reactions (see section 3.2.1), 56,[78][79][80]85 and dawsonite peaks were not observed in the XRD spectra of the THF-insolubles (Figure 5). Furthermore, the amount of Na 2 CO 3 formed from the 2−3 wt % dawsonite in the oil shale would account for the alkaline H 2 O-solubles in the THFinsolubles.…”

Acta Geologica Polonica

“…Consequently, gibbsite occurring in the outer parts of dawsonite veins might have formed by the decomposition of dawsonite (cf. Palayangoda and Nguyen 2015), probably related to post-thrusting processes combined with fluid flow within thrust fault zones. This possibility would explain the irregular distribution of gibbsite assemblages within fibrous dawsonite veins (Text-fig.…”

“…The occurrence of dawsonite [NaAlCO 3 (OH) 2 ] in natural settings is well known from sedimentary rocks in different localities worldwide (Stevenson and Stevenson, 1965;Baker et al 1995;Ferrini et al 2003;Worden 2006;Zalba et al 2011). Dawsonite is present in oil shales and natural carbon dioxide reservoirs (Smith and Milton 1966;Kamilli and Ohmoto 1977;Moor et al 2005;Kharaka et al 2006;Okuyama 2014;Palayangoda and Nguyen 2015;Kiràly et al 2016;Li and Li 2017), and coal (Golab et al 2006;Ming et al 2017). It is also known from fluid inclu-sions in hydrothermal minerals (McLaughlin et al 1985;Sirbescu and Nabelek 2003).…”