Preparation and Adsorption Properties of Microporous Manganese Titanate Pillared with Silica

Abstract

The layered material Rb x Mn x Ti 2-x O 4 (x ) 0.75) was pillared with silica. The Rb ions were first exchanged with n-alkylammonium ions (C n H 2n+1 NH 3 , n ) 6-18) to separate the interlayer space of the titanate, and then tetraethoxysilane was hydrolyzed between the layers. Burning off the organic parts resulted in silica pillared microporous solids with a surface area as large as 500-800 m 2 /g. The porous structure was stable up to 600 °C. Adsorption-desorption isotherms for various vapors, such as water, methanol, toluene, and mesitylene, were measured, which suggested that the porous structure formed between the layers was very similar to those of zeolites and uniform without mesopores. The pores showed hydrophobic properties. Their size was on the order of that of mesitylene.

Fabrication of MnO2-pillared layered manganese oxide through an exfoliation/reassembling and oxidation process

“…The delaminated BirMO slurry was poured into 1 M aqueous solution of Mn(NO) 3 . The molar ratio of Mn 2+ ions to the exchangeable capacity of H-BirMO was adjusted to 5.…”

“…V p d (cm 3 surface area. These results clearly indicate that MnO 2 pillar and followed heat treatment result in the production of mesoporous.…”

“…due to their particular morphologies, structures and properties [1][2][3]. Typically, pillared inorganic layered nanocomposites are prepared by intercalating guest species into the interlayer of the host inorganic layered materials, followed by calcinations which result in porous architectures in layered inorganic materials [4][5][6].…”

Design and Synthesis of New Functional Materials Using the Interstices of Inorganic Host Structure

“…The interlayer Rb cannot be directly ionexchanged with metal hydroxyl cations such as those used in the formation of pillared clays. 32),33) The Rb ions were first exchanged with alkylammo nium ions, and TEOS was hydrolyzed between the layers to form silica pillar precursor, which was changed into SiO 2 pillar between the layers by calcination. On calcination at 600 C, silica pillared titanate with high specific surface area of about 800 m 2 /g and pores comparable with trimethylbenzene was obtained.…”

Adsorption characteristics of nanoporous carbon–silica composites synthesized from graphite oxide by a mechanochemical intercalation method

“…The fundamental understanding and application for highperformance adsorption/separation and heterogeneous catalysts require nanoporous materials with tailored pore structures and controlled surface properties. These materials can be obtained from some layered material precursors such as clay minerals by pillaring and/or intercalation methods [4][5][6][7][8][9][10][11][12][13].…”