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A microporosity study of Villamayor Sandstone (Salamanca, Spain)
AbstractIn the clay fraction (<2 μm) of the Villamayor Sandstone (Salamanca, Spain), pores with a diameter close to 3 nm are predominant. These pores are in the mesoporosity range (2–40 nm) and micropores are absent. The clay fraction is composed mainly of mica and chlorites with small amounts of quartz and feldspars; very little palygorskite or smectite is present. Specific surface area values range from 62 to 78 m2 g−1. On heating in vacuo at 470 K no significant change in the pore size distribution was observed, but the specific surface area decreased by ca. 10%, probably due to sintering of the particles on loss of water and surface hydroxyl groups. Treatment with humid nitric oxide for 20 h at this same temperature decreased the contribution by these pores but increased that from pores in the range 5–15 nm diameter. No change was observed, however, in the X-ray diffraction diagram, indicating that changes upon nitric oxide treatment affect isolated, non-periodical portions of the crystals.
A microporosity study of Villamayor Sandstone (Salamanca, Spain)
AbstractIn the clay fraction (<2 μm) of the Villamayor Sandstone (Salamanca, Spain), pores with a diameter close to 3 nm are predominant. These pores are in the mesoporosity range (2–40 nm) and micropores are absent. The clay fraction is composed mainly of mica and chlorites with small amounts of quartz and feldspars; very little palygorskite or smectite is present. Specific surface area values range from 62 to 78 m2 g−1. On heating in vacuo at 470 K no significant change in the pore size distribution was observed, but the specific surface area decreased by ca. 10%, probably due to sintering of the particles on loss of water and surface hydroxyl groups. Treatment with humid nitric oxide for 20 h at this same temperature decreased the contribution by these pores but increased that from pores in the range 5–15 nm diameter. No change was observed, however, in the X-ray diffraction diagram, indicating that changes upon nitric oxide treatment affect isolated, non-periodical portions of the crystals.
A microporosity study of Villamayor Sandstone (Salamanca, Spain)
Arco, Margarita Del (author) / Carballo, Ana M. (author) / Holgado, María J. (author) / Martín, Cristina (author) / Rives, V. (author)
Applied Clay Science ; 2 ; 375-383
1987-05-14
9 pages
Article (Journal)
Electronic Resource
English
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