Role of the interlayer space of montmorillonite in hydrocarbon generation: An experimental study based on high temperature–pressure pyrolysis

Yuan, Peng; Liu, Hongmei; Dong, Lijie; Tan, Daoyong; Yan, Wu; He, Hongping

doi:10.1016/j.clay.2013.03.007

Cited by 48 publications

(10 citation statements)

References 51 publications

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“…Diffusion of water molecules and cations in the interlayer of swelling clay minerals, known as the smectite group (and which includes montmorillonite), is a critical process that controls ion exchange and adsorptive properties important to many environmental, industrial, petroleum, and related engineering systems. − The nanoconfinement of water and cations in the interlayer region of smectite minerals offers a unique opportunity to examine the influence of water content, cation charge, and the influence of clay surfaces on the transport properties of interlayer species. These molecular properties, combined with the low permeability of clay-rich rocks such as bentonite, underscore the use of clays and clay minerals as adsorptive backfill materials for the safe isolation of high-level radioactive waste in geological waste repositories. − Similarly, such natural and modified materials are often used for the remediation of chemical waste spills to prevent the spread of contaminants into the greater environment. − Clays are an important mineral in many subsurface environments, and understanding their properties is important for many energy applications.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Diffusion and Electrical Conductivity in Montmorillonite Interlayers

et al. 2016

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The diffusion of water and ions in the interlayer region of smectite clay minerals represents a direct probe of the type and strength of clay−fluid interactions. Interlayer diffusion also represents an important link between molecular simulation and macroscopic experiments. Here we use molecular dynamics simulation to investigate trends in cation and water diffusion in montmorillonite interlayers, looking specifically at the effects of layer charge, interlayer cation and cation charge (sodium or calcium), water content, and temperature. For Na-montmorillonite, the largest increase in ion and water diffusion coefficients occurs between the one-layer and two-layer hydrates, corresponding to the transition from inner-sphere to outer-sphere surface complexes. Calculated activation energies for ion and water diffusion in Namontmorillonite are similar to each other and to the water hydrogen bond energy, suggesting the breaking of water−water and water−clay hydrogen bonds as a likely mechanism for interlayer diffusion. A comparison of interlayer diffusion with that of bulk electrolyte solutions reveals a clear trend of decreasing diffusion coefficient with increasing electrolyte concentration, and in most cases the interlayer diffusion results are nearly coincident with the corresponding bulk solutions. Trends in electrical conductivities computed from the ion diffusion coefficients are also compared.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Diffusion and Electrical Conductivity in Montmorillonite Interlayers

et al. 2016

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“…In our previous study, pyrolysis experiments were conducted on the ALA and Mt-ALA complexes in a confined gold capsule system at a fixed temperature (350°C) and pressure (36 MPa) for 48 h (Yuan et al, 2013). The gaseous product analysis showed that Mt promoted the decarboxylation of ALA to yield a considerable amount of CO 2 .…”

Section: Evolved Gas Analysismentioning

confidence: 99%

Thermal degradation of organic matter in the interlayer clay–organic complex: A TG-FTIR study on a montmorillonite/12-aminolauric acid system

Liu

Yuan

Qin

et al. 2013

Applied Clay Science

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“…Insoluble kerogen is known for its complex molecular structure and physical interactions with clay minerals, thus being called discrete POM . The differences in properties may lead to different pyrolysis behaviors of OMs with different forms of occurrence. − Yuan et al and Bu et al prepared different clay–OM complexes for pyrolysis experiments and found that the catalytic effect of the interlayer clay–OM complex, external surface clay–OM complex, and the clay–OM mixture gradually weakened. Rahman et al compared the pyrolysis behavior of source rocks with different rock fabrics and found that source rocks with nanocomposite fabric had lower onset temperature and activation energy than source rocks with particulate fabric.…”

Section: Introductionmentioning

confidence: 99%

Multistage Hydrocarbon Generation of Saline Lacustrine Source Rocks in Hydrous Pyrolysis: Insights from Clay Mineral–Organic Matter Interactions

Cai

et al. 2023

ACS Omega

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The organic matter (OM) in shale is closely associated with clay minerals, and its maturation is usually accompanied by the diagenesis of these minerals, especially smectite illitization. However, the effect of mineral transformation and its accompanying change of mineral–OM interactions in shale on hydrocarbon generation is still unclear. To investigate this question, smectite-rich immature shale was selected to carry out hydrous pyrolysis. Organic geochemistry and mineralogy of pyrolysates at different temperatures show that the maturation of OM is accompanied by the transformation of bulk and clay minerals. Based on the change in hydrocarbon yield, Rock-Eval parameters, and mineral composition, hydrocarbon generation in this study is divided into three stages: 25–300, 300–400, and 400–500 °C, which are the result of the synergistic evolution of clay minerals and OM. Multistage hydrocarbon generation can be attributed to the mineral transformation-induced desorption of mineral-bound soluble OM (SOM), decarboxylation and hydrocracking of kerogen promoted by solid acids, and cross-linking and cracking reactions of free SOM and residual kerogen under high temperatures. Although different from the classical hydrocarbon generation model of kerogen, this multistage hydrocarbon generation is consistent with the characteristics of the saline lacustrine source rocks in nature. The mineral transformation-induced desorption of SOM is a new pathway for petroleum formation, which can well explain the formation of low-mature oils in nature. In addition, the release of mineral-bound and kerogen-bound biomarkers results in two reversals of isomerization ratios. Considering mineral transformation and mineral–OM interactions can help us better understand and refine the hydrocarbon generation theory of OM.

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Role of the interlayer space of montmorillonite in hydrocarbon generation: An experimental study based on high temperature–pressure pyrolysis

Cited by 48 publications

References 51 publications

Molecular Dynamics Simulation of Diffusion and Electrical Conductivity in Montmorillonite Interlayers

Molecular Dynamics Simulation of Diffusion and Electrical Conductivity in Montmorillonite Interlayers

Thermal degradation of organic matter in the interlayer clay–organic complex: A TG-FTIR study on a montmorillonite/12-aminolauric acid system

Multistage Hydrocarbon Generation of Saline Lacustrine Source Rocks in Hydrous Pyrolysis: Insights from Clay Mineral–Organic Matter Interactions

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