Determination of pore size and pore wall structure of MCM-41 by using nitrogen adsorption, transmission electron microscopy, and X-ray diffraction

Article Abstract:

Issues concerning the synthesis of highly ordered MCM-41 materials using mixed or single surfacants which have alkyl chain lengths from 12 to 22 are reported.

Observations, Electron microscopy, Nitrogen (Chemical element), Chemistry, Physical and theoretical, Physical chemistry, Alkylates, Alkylates (Petroleum derivatives)

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Block-copolymer-templated ordered mesoporous silica: array of uniform mesopores or mesopore-micropore network?

Article Abstract:

Microporosity and connectivity of ordered mesopores of SBA-15 were studied using nitrogen adsorption and novel methods based on selective pore blocking and on the imaging of inverse platinum replica of ordered mesoporous structure. The complementary pores appear to be stable up to 1173 K, but calcination at 1273 K appears to eliminate them and allows one to obtain the SBA-15 sample with adsorption properties close to those of MCM-41.

Science & research, Industrial Gas Manufacturing, Industrial gases, Nitrogen, Platinum compounds, Structure

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Tailoring the pore structure of SBA-16 silica molecular sieve through the use of copolymer blends and control of synthesis temperature and time

Article Abstract:

The synthesis strategy of SBA-16 mesoporous silicas with cubic Im3m structure is reported. The synthesis involves Pluronic F127 poly(ethyleneoxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer (EO106PO70EO106) and its blends with Pluronic P123 triblock copolymer (EO20PO70EO20) as supramolecular templates.

Cyclic Crude and Intermediate Manufacturing, Ethylene, Industrial sand, Silica & Silica Sand, Industrial Sand Mining, Silica, X-ray diffraction, Silicon dioxide, Copolymers

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