Acetalization of glycerol with ketones and aldehydes catalyzed by high silica Hβ zeolite

Examination of sand grain surfaces from early Paleozoic sandstones by electron microscopy reveals a variety of secondary effects caused by rock-forming processes after final deposition of the sand. Detailed studies were conducted on both coarse (≥0.71mm) and fine (=0.25mm) fractions of St. Peter Sandstone, a widespread sand deposit underlying much of the U.S. Central Interior and used in the glass industry because of its remarkably high silica purity.The very friable sandstone was disaggregated and sieved to obtain the two size fractions, and then cleaned by boiling in HCl to remove any iron impurities and rinsed in distilled water. The sand grains were then partially embedded by sprinkling them onto a glass slide coated with a thin tacky layer of latex. Direct platinum shadowed carbon replicas were made of the exposed sand grain surfaces, and were separated by dissolution of the silica in HF acid.

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Synthesis of High-Silica Aluminosilicate Zeolites

10.1016/s0167-2991(09)x6010-6 ◽

1987 ◽

Keyword(s):

High Silica

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Compositional and Physical Gradients in the Magmas of the Devine Canyon Tuff, Eastern Oregon: Constraints for Evolution Models of Voluminous High-silica Rhyolites

10.15760/etd.3485 ◽

2017 ◽

Author(s):

Shelby Isom

Keyword(s):

High Silica

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CHARACTERIZATION OF THE MARBLE CANYON AND CAVE PEAK GRANITOIDS IN TRANS-PECOS, TEXAS: INSIGHTS INTO THE PETROGENESIS OF HIGH-SILICA Y+REE-ENRICHED MAGMAS

10.1130/abs/2019sc-327363 ◽

2019 ◽

Author(s):

Brent A. Elliott ◽

◽

Mert Ugurhan ◽

J. Richard Kyle

Keyword(s):

High Silica ◽

In Trans

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Influence of Shaping Condition on Etherification Performance of Hβ Zeolite

Petroleum Science and Technology ◽

10.1080/10916460500292766 ◽

2006 ◽

Vol 24 (12) ◽

pp. 1477-1484 ◽

Cited By ~ 1

Author(s):

Tingfang Hu ◽

Jinpeng Chen ◽

Haiyan Wang ◽

Jun Ma ◽

Min Wei

Keyword(s):

Hβ Zeolite ◽

Shaping Condition

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The Late Carboniferous to Early Permian high silica magmatism in the Southern Mongolia: Implications for tectonic evolution and continental growth

Gondwana Research ◽

10.1016/j.gr.2021.05.005 ◽

2021 ◽

Author(s):

Zhou Hai ◽

Zhao Guochun ◽

Han Yigui ◽

Zhang Donghai ◽

Qian Liu ◽

...

Keyword(s):

Tectonic Evolution ◽

Late Carboniferous ◽

Early Permian ◽

High Silica ◽

Continental Growth

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Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

Membranes ◽

10.3390/membranes11040249 ◽

2021 ◽

Vol 11 (4) ◽

pp. 249

Author(s):

Yasuhisa Hasegawa ◽

Chie Abe ◽

Mayumi Natsui ◽

Ayumi Ikeda

Keyword(s):

Molecular Size ◽

Gas Permeation ◽

Zeolite Membrane ◽

Type Zeolite ◽

High Silica ◽

Separation Of Co2 ◽

Α Al2o3 ◽

Separation Performances ◽

Molecular Sieving ◽

Permeation Properties

The polycrystalline CHA-type zeolite layer with Si/Al = 18 was formed on the porous α-Al2O3 tube in this study, and the gas permeation properties were determined using single-component H2, CO2, N2, CH4, n-C4H10, and SF6 at 303–473 K. The membrane showed permeation behavior, wherein the permeance reduced with the molecular size, attributed to the effect of molecular sieving. The separation performances were also determined using the equimolar mixtures of N2–SF6, CO2–N2, and CO2–CH4. As a result, the N2/SF6 and CO2/CH4 selectivities were as high as 710 and 240, respectively. However, the CO2/N2 selectivity was only 25. These results propose that the high-silica CHA-type zeolite membrane is suitable for the separation of CO2 from CH4 by the effect of molecular sieving.

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