Production of carbon molecular sieves from palm shell through carbon deposition from methane

Abstract

The possibility of production of carbon molecular sieve (CMS) from palm shell as a waste lignocellulosic biomass was investigated. CMS samples were prepared through heat treatment processes including carbonization, physiochemical activation and chemical vapor deposition (CVD) from methane. Methane was pyrolyzed to deposit fine carbon on the pore mouth of palm shell-based activated carbon to yield CMS. All the deposition experiments were performed at 800 ºC, while the methane flow rate (100, 200, 300 mL min-1 CH4 diluted in 500 mL min-1 N2) and deposition time (30 to 60 min) were the investigated parameters. The textural characteristics of the CMSs were assessed by N2 adsorption. The largest BET surface area (752 m2 g-1), micropore surface area (902.2 m2 g-1) and micropore volume (0.3466 cm3 g-1) was obtained at the CH4 flow rate of 200 mL min-1 and deposition time of 30 min. However, prolonging the deposition time to 45 min yielded in a micropouros CMS with a narrow pore size distribution

A review of CO2adsorbents performance for different carbon capture technology processes conditions

“…222,223 It can be prepared from any inexpensive carbonaceous material with low inorganic compounds such as lignocellulosic materials, biomass and coal by pyrolyzation, covering, and carbon deposition methods. [222][223][224][225][226][227][228][229][230][231][232] The chemical vapor deposition (CVD) method utilizes carbon deposition agents such as acetylene, 233 benzene, 221,229,234 methylpentane, 227 cyclohexane, 229 and methane 235,236 either in liquid or vapor form for pyrolytic carbon deposition at pore mouth to match the pore entrance with the adsorbate size. 220 The advantage of using CMS-based CO 2 adsorbent is its versatile selectivity for gas molecule separation with different molecular sizes.…”

“…In addition to its low CO 2 adsorption capacity, the CMS is not favored as a CO 2 adsorbent due to its high toxicity and high cost of depositing agents. 236,241 It can also generate intermediates during the deposition process 220,233,236 and the CO 2 adsorption performance is dependent on the pyrolytic reaction or carbon deposition conditions. 221,242 Layered anionic clays Layered double hydroxides (LDHs) are classified as synthetic anionic clays.…”

Production and Characterization of Carbon Molecular Sieves from Bituminous Lafia-Obi Nasarawa Coal by Pore Size Modification with Spent Engine Oil

“…2 They are microporous materials, capable of carrying out molecular separations based on the differences in the rates of adsorption of the adsorbate molecules. 3 The choice of the raw material constitutes the first important step for CMS production. Generally, certain bituminous coal qualities and coked coconut shells have proven to be suitable raw materials for industrial production.…”