✦ LIBER ✦

Alteration of molecular sieving properties of microporous carbons by heat treatment and carbon gasification

✍ Scribed by S.K. Verma; P.L. Walker Jr.

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 966 KB
Volume: 28
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(90)90111-b

No coin nor oath required. For personal study only.

✦ Synopsis

The effect of thermal treatment on the porosity of microporous carbons, of pore structure ranging between that of a carbon molecular sieve (CMS) and an activated carbon (AC), was investigated by adsorption and diffusion of 0, and Ar. Sieving behavior was improved in the case of carbons containing molecular sieving pores. Selectivity for separation of 0, and Ar was enhanced by heat treatment of a CMS at -1100 K. No useful molecular sieving properties were developed by the thermal treatment of an AC. Pore opening by controlled carbon gasification was also demonstrated as a method to adjust the size of the sieving pores of carbons containing an appropriate pore structure. In some cases, the net effect of carbon gasification was shrinkage of pores in a particular size range, which introduced interesting possibilities for production of highly selective CMS.

📜 SIMILAR VOLUMES

Preparation of carbon molecular sieves b

Preparation of carbon molecular sieves by propylene pyrolysis over microporous carbons

✍ S.K. Verma; P.L. Walker Jr. 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 846 KB

Modification ofthe pore structure of microporous carbons by depositing carbon from pyrolysis of CJH6 between 973-I I23 K was investigated in regard to development of molecular sieving properties for separation of O2 and Ar. Excellent adsorption kinetics and selectivity for separation of O2 and Ar we

Control of micropore diffusivities of mo

Control of micropore diffusivities of molecular sieving carbon by deposition of hydrocarbons

✍ Kazuyuki Chihara; Motoyuki Suzuki 📂 Article 📅 1979 🏛 Elsevier Science 🌐 English ⚖ 390 KB

Adsorption of ethylbenzene and styrene at 1504WC followed by heat treatment at 400°C was tried for controlling diffusivities in micropores of Molecular Sieving Carbon. The amount of carbon deposited after heat treatment is a function of adsorption temperature. Diffusivities of oxygen and nitrogen we

Carbon as a support for catalysts—IV. Mo

Carbon as a support for catalysts—IV. Modification of molecular sieve character of glassy carbons by varying heat treatment temperature

✍ P.L. Walker Jr.; A. Oya; O.P. Mahajan 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 207 KB

Kinetic study of gasification by oxygen

Kinetic study of gasification by oxygen and carbon dioxide of pure and doped graphitizable carbons of increasing heat treatment temperatures

✍ H. Marsh; D.A. Taylor; J.R. Lander 📂 Article 📅 1981 🏛 Elsevier Science 🌐 English ⚖ 595 KB

Pure graphitizable carbons have been prepared from polyvinyl acetate at heat treatment temperatures (HTT) of 1200-3200K. Carbons doped with V, Cr, Mn, Fe and Co, by additions of organometallic compounds to the vinyl acetate monomer, of HTT 12OOK, were also prepared. Carbons from acenaphthylene, H'lT

Structural parameters and molecular siev

Structural parameters and molecular sieve properties of carbons prepared from metal carbides

✍ H.P Boehm; H.H Warnecke 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 132 KB

can lead to serious disagreement between the calculated and real L. values if strain is not considered to modify the scattering profiles. ture range studied which differ with respect. to their microstructure as determined by TEM studies and with respect to their micropore spectra, density, inner su

Molecular sieving selectivity of active

Molecular sieving selectivity of active carbons and active carbon fibers improved by chemical vapour deposition of benzene

✍ Y. Kawabuchi; S. Kawano; I. Mochida 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 667 KB

Modification of the pore size of several types of carbon adsorbents by chemical vapour deposition of carbon from benzene at 1000 K was examined. The carbons included commercial molecular sieve carbon (MSC), pitch based active carbon fiber (ACF), super and commercial active carbon (S-AC, AC). Greatly