Highly microporous boron nitride for gas adsorption

Abstract

Boron nitride materials with surface areas of 53-696 m2/g and pore volumes 0.036-0.390 cm3/g have been produced by vacuum pyrolysis of poly(4,6-borazinylamine) polymerized under dilute conditions. These samples exhibit type I isotherms, indicating that a majority of the porosity occurs in pores of size less than 1.0 nm. The surface areas and pore volumes are maximized at pyrolysis temperatures of 800 "C, and are essentially eliminated by 1200 "C. Small-angle X-ray scattering (SAXS) measurements confirm this change in structure with pyrolysis temperature.

Characterization of Ceramics by X‐Ray and Neutron Small‐Angle Scattering

“…(3) Interfaces, Membranes, Thin Films, Coatings, and Composites The sensitivity of SAS methods to the scattering from internal surfaces and interfaces has resulted in their application to quantify microstructures with high interface densities such as found in nanocomposites or within precipitate morphologies. [1][2][3][12][13][14][15][16][17][18][19][20][21][22][23][24][25]34, This is of particular importance when the physical or chemical properties are determined by such interfaces. Membranes, films, and coatings also fall into this category and have been the subject of several SAS investigations using conventional SANS and SAXS, USAXS and MSANS methods.…”

Simple synthesis of mesoporous boron nitride with strong cathodoluminescence emission

“…Porous materials are extensively used as catalyst supports, gas adsorbents, sensors, for chemical purification and separation due to their high surface area and high porosity [1][2][3][4][5][6][7][8][9]. Traditional porous oxide supports such as Al 2 O 3 , SiO 2 , and zeolite have been widely utilized, whereas the low thermal conductivity and high sensibility to moisture may sometimes result in some disadvantages, such as causing severe metal sintering on the hot spots, and making the catalyst be covered with water at low temperature [10][11][12][13].…”

“…Boron nitride (BN) has some unique properties, such as high thermal conductivity, hydrophobility, good optical properties, excellent resistance to chemical attack and high stability towards oxidation [4,5,12,15], making porous BN particularly applicable as gas absorbents [4,5], and catalyst supports at high temperatures under harsh conditions [6,7,16,17]. Recently, the preparation of porous BN has received growing attention.…”

“…Pyrolysis of borane-based molecular precursors has also been adopted to fabricate porous BN. Borek et al [4] produced porous BN by vacuum pyrolysis of poly (4, 6-borazinylamine) at 600-1200 1C. Lindquist et al [22] fabricated BN aerogels which exhibited excellent thermal stability even when heated to 1500 1C in argon atmosphere.…”

Platinum Nanoparticle Loading of Boron Nitride Aerogel and Its Use as a Novel Material for Low‐Power Catalytic Gas Sensing

“…To exploit the high surface area of these nanomaterials in a 3D geometry, there have been efforts to synthesize low density, high surface area 3D structures of BN comprised of lower dimensional nanomaterials. [11][12][13][14] These high surface area 3D BN materials have been proposed for hydrogen storage, [15][16][17][18] hydrocarbon uptake, [19][20][21] and water purifi cation [ 17,22 ] due to the enhanced physisorption properties of BN compared to carbon. [ 23 ] In addition to these applications, high surface area BN is an interesting candidate as a support material for optically or catalytically active nanoparticles, due to its wide band gap and chemical inertness.…”