An NMR study of porous rock and biochar containing organic material

Webber, J. Beau W.; Corbett, Patrick William Michael; Semple, Kirk T.; Ogbonnaya, Uchenna; Teel, Wayne S.; Masiello, Caroline A.; Fisher, Q.J.; Valenza, John J.; Song, Yi‐Qiao; Hu, Qinhong

doi:10.1016/j.micromeso.2013.04.004

Cited by 54 publications

(48 citation statements)

References 10 publications

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“…Soil water contents were increased by biochar addition, an effect that has been already demonstrated in other field experiments (Baronti et al, 2014;Webber et al, 2013) and that is explained by biochar physical and chemical properties (porosity, enhanced surface area, hydrogen bonds) (Conte et al, 2013).…”

Section: Discussionsupporting

confidence: 67%

Biochar–macrofauna interplay: Searching for new bioindicators

Castracani

Maienza

Grasso

et al. 2015

Science of The Total Environment

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Section: Discussionsupporting

confidence: 67%

Biochar–macrofauna interplay: Searching for new bioindicators

Castracani

Maienza

Grasso

et al. 2015

Science of The Total Environment

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“…The porosity of the untreated bamboo biochar, BC (Table 2) follows the normal pattern of increased pore volume with pyrolysis temperature from 250 °C to 350 °C, while above 350 °C, the pore volume is nearly constant 32 . The lower pore volume at 250 C is attributable to hydrophobic volatiles formed from the biomass degradation, condensing into the pores of the forming biochar.…”

Section: Infiltrationmentioning

confidence: 91%

Mineral–Biochar Composites: Molecular Structure and Porosity

Rawal¹,

Joseph²,

Hook³

et al. 2016

Environ. Sci. Technol.

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161

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Dramatic changes in molecular structure, degradation pathway, and porosity of biochar are observed at pyrolysis temperatures ranging from 250 to 550 °C when bamboo biomass is pretreated by iron-sulfate-clay slurries (iron-clay biochar), as compared to untreated bamboo biochar. Electron microscopy analysis of the biochar reveals the infusion of mineral species into the pores of the biochar and the formation of mineral nanostructures. Quantitative 13C nuclear magnetic resonance (NMR) spectroscopy shows that the presence of the iron clay prevents degradation of the cellulosic fraction at pyrolysis temperatures of 250 °C, whereas at higher temperatures (350-550 °C), the clay promotes biomass degradation, resulting in an increase in both the concentrations of condensed aromatic, acidic, and phenolic carbon species. The porosity of the biochar, as measured by NMR cryoporosimetry, is altered by the iron-clay pretreatment. In the presence of the clay, at lower pyrolysis temperatures, the biochar develops a higher pore volume, while at higher temperature, the presence of clay causes a reduction in the biochar pore volume. The most dramatic reduction in pore volume is observed in the kaolinite-infiltrated biochar at 550 °C, which is attributed to the blocking of the mesopores (2-50 nm pore) by the nonporous metakaolinite formed from kaolinite. Disciplines Engineering | Physical Sciences and Mathematics

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“…The cylindrical rf probe had dimensions 60 mm × 51 mm (length × diameter). The rf pulses were 20,[52][53][54] Several custom modifications were made to the rf receiver chain. The broadband first stage preamplifier was replaced with a tuned preamplifier [Advanced Receiver Research, Burlington CT, USA] to increase the SNR.…”

Section: Hardwarementioning

confidence: 99%

Contributed Review: Nuclear magnetic resonance core analysis at 0.3 T

Mitchell

Fordham

2014

Review of Scientific Instruments

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Nuclear magnetic resonance (NMR) provides a powerful toolbox for petrophysical characterization of reservoir core plugs and fluids in the laboratory. Previously, there has been considerable focus on low field magnet technology for well log calibration. Now there is renewed interest in the study of reservoir samples using stronger magnets to complement these standard NMR measurements. Here, the capabilities of an imaging magnet with a field strength of 0.3 T (corresponding to 12.9 MHz for proton) are reviewed in the context of reservoir core analysis. Quantitative estimates of porosity (saturation) and pore size distributions are obtained under favorable conditions (e.g., in carbonates), with the added advantage of multidimensional imaging, detection of lower gyromagnetic ratio nuclei, and short probe recovery times that make the system suitable for shale studies. Intermediate field instruments provide quantitative porosity maps of rock plugs that cannot be obtained using high field medical scanners due to the field-dependent susceptibility contrast in the porous medium. Example data are presented that highlight the potential applications of an intermediate field imaging instrument as a complement to low field instruments in core analysis and for materials science studies in general.

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An NMR study of porous rock and biochar containing organic material

Cited by 54 publications

References 10 publications

Biochar–macrofauna interplay: Searching for new bioindicators

Biochar–macrofauna interplay: Searching for new bioindicators

Mineral–Biochar Composites: Molecular Structure and Porosity

Contributed Review: Nuclear magnetic resonance core analysis at 0.3 T

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