Ultrafast synthesis of high-silica Beta zeolite from dealuminated MOR by interzeolite transformation for methanol to propylene reactions

CO chemisorption on PVP-protected Pt clusters supported on fine high silica zeolite Beta has been studied by in situ FTIR spectroscopy. Two special CO adsorption bands are observed at 2050 cm-1 and 1860 cm-1, respectively, on the surface of catalysts. The frequency shifts and CO band intensity vary with the changing of catalyst preparation parameters, such as polymer amount, Pt loading and pretreatment processing. The results show that PVP-protected Pt clusters have high dispersion on Beta zeolite surface and strong chemical adsorption to CO.

Download Full-text

Multiple paths to nanocrystalline high silica beta zeolite

Microporous and Mesoporous Materials ◽

10.1016/j.micromeso.2009.06.035 ◽

2010 ◽

Vol 127 (1-2) ◽

pp. 104-118 ◽

Cited By ~ 31

Author(s):

Dorothy E. Kuechl ◽

Annabelle I. Benin ◽

Lisa M. Knight ◽

Hayim Abrevaya ◽

Stephen T. Wilson ◽

...

Keyword(s):

Beta Zeolite ◽

Multiple Paths ◽

High Silica

Download Full-text

Variations in Surface Textures of Quartz Sand using Electron Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069466 ◽

1970 ◽

Vol 28 ◽

pp. 494-495

Author(s):

Eugene J. Amaral

Keyword(s):

Electron Microscopy ◽

Glass Industry ◽

Glass Slide ◽

Distilled Water ◽

Early Paleozoic ◽

Secondary Effects ◽

Surface Textures ◽

High Silica ◽

Sand Deposit ◽

The U.S

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.

Download Full-text

Synthesis of High-Silica Aluminosilicate Zeolites

10.1016/s0167-2991(09)x6010-6 ◽

1987 ◽

Keyword(s):

High Silica

Download Full-text

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

Download Full-text

Rapid, Non-Toxic Synthesis of Beta Zeolites

10.26434/chemrxiv.6432155 ◽

2018 ◽

Author(s):

Felix Hemmann ◽

Jonathan Hackebeil ◽

Andreas Lißner ◽

Florian Mertens

Keyword(s):

Hydrofluoric Acid ◽

Molecular Sieves ◽

Toxic Chemicals ◽

Lewis Acidity ◽

Beta Zeolite ◽

Seeded Growth ◽

Related Research ◽

Beta Zeolites ◽

Growth Method ◽

Fast Synthesis

Molecular sieves with beta zeolite topology are promising catalysts for various reactions as they exhibits extraordinary Lewis acidity. However, their industrial application and related research in academica is hindered because their synthesis is time consuming and typically involves toxic chemicals as hydrofluoric acid. Therefore, tetraethylammonium fluorid was tested as a non-toxic fluotide source for the synthesis of beta zeolites. In combination with the previously reported nano-seeded growth method, a fast synthesis of beta zeolites only involving non-toxic chemicals was possible. Synthesized zeolites show comparable selectivity in the Bayer-Villinger oxidation as conventional zeolites synthesized with hydrofluoric acid.<br>

Download Full-text