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• W4308374968 endingPage "126621" @default.
• W4308374968 startingPage "126621" @default.
• W4308374968 abstract "• The catalytic capacity evolution of Mt in ISC of HOO was explored. • The thermal transformation process of Mt had a small effect on the LTO of heavy oil. • Mt IW dehydration process enhanced its catalytic role in the HTO of heavy oil. • Mt dehydroxylation process weakened its catalytic role in the HTO of heavy oil. • The overlapping process had no positive catalytic effect on the HTO of heavy oil. Clay minerals such as montmorillonite are significant in petroleum storage and recovery. Montmorillonite (Mt) is a natural solid acid catalyst containing Brønsted and Lewis acid sites and can catalyze heavy oil oxidation (HOO) during in-situ combustion (ISC). However, its catalytic activity largely depends on the heating process of heavy oil. In the study, the catalytic capacity evolution of Mt in ISC of heavy oil was explored with the isoconversional method and thermal analysis. In low-temperature oxidation (LTO) and high-temperature oxidation (HTO) stages, the addition of Mt largely reduced the peak temperatures (T peak ) of DTA and DTG and the T peak of H 2 O (LTO and HTO stages) and CO 2 (HTO stage) in HOO. Notably, Mt did not always show the positive catalytic effect. In LTO stage, the thermal transformation process had a small effect on DTA T peak , T peak of H 2 O and CO 2 , and the reaction activation energy ( E α ) of HOO. In HTO stage, the catalytic effect of Mt on HOO was related to its thermal transformation process, especially interlayer water (IW) dehydration and dehydroxylation. In HTO stage, the IW dehydration process of Mt showed the strongest catalytic effect on HOO, significantly reduced DTA T peak and E α , and resulted in the lowest T peak of H 2 O and CO 2. The dehydroxylation process of Mt also showed a certain effect, whereas the overlapping process between the dehydration (IW) reaction and partial dehydroxylation reaction of Mt had no positive catalytic effect on HOO. DTA, TG-FTIR, and non-isothermal kinetic analysis further confirmed that the catalytic capacity of Mt in HTO stage was improved by IW dehydration process of Mt and weakened by the dehydroxylation process of Mt." @default.
• W4308374968 created "2022-11-11" @default.
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• W4308374968 date "2023-02-01" @default.
• W4308374968 modified "2023-10-14" @default.
• W4308374968 title "Catalytic capacity evolution of montmorillonite in in-situ combustion of heavy oil" @default.
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• W4308374968 doi "https://doi.org/10.1016/j.fuel.2022.126621" @default.
• W4308374968 hasPublicationYear "2023" @default.
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