The modification of pore size in activated carbon fibers by chemical vapor deposition and its effects on molecular sieve selectivity

Kawabuchi, Yuji; Oka, Hidetoshi; Kawano, Shizuo; Mochida, Isao; Yoshizawa, Noriko

doi:10.1016/s0008-6223(97)00186-3

Cited by 61 publications

(33 citation statements)

References 12 publications

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“…Thus, AC could not contribute significantly to the surface properties of AC/CNF composites in which AC appears only as a catalyst support or macroscopic frame. The reduction in the BET area after growth of CNF on activated carbon, has been reported in previous studies [12,29]. …”

Section: Discussionsupporting

confidence: 74%

Preparation of a new adsorbent from activated carbon and carbon nanofiber (AC/CNF) for manufacturing organic-vacbpour respirator cartridge

Jahangiri

Javad

Shahtaheri

et al. 2013

J Environ Health Sci Engineer

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In this study a composite of activated carbon and carbon nanofiber (AC/CNF) was prepared to improve the performance of activated carbon (AC) for adsorption of volatile organic compounds (VOCs) and its utilization for respirator cartridges. Activated carbon was impregnated with a nickel nitrate catalyst precursor and carbon nanofibers (CNF) were deposited directly on the AC surface using catalytic chemical vapor deposition. Deposited CNFs on catalyst particles in AC micropores, were activated by CO2 to recover the surface area and micropores. Surface and textural characterizations of the prepared composites were investigated using Brunauer, Emmett and Teller’s (BET) technique and electron microscopy respectively. Prepared composite adsorbent was tested for benzene, toluene and xylene (BTX) adsorption and then employed in an organic respirator cartridge in granular form. Adsorption studies were conducted by passing air samples through the adsorbents in a glass column at an adjustable flow rate. Finally, any adsorbed species not retained by the adsorbents in the column were trapped in a charcoal sorbent tube and analyzed by gas chromatography. CNFs with a very thin diameter of about 10-20 nm were formed uniformly on the AC/CNF. The breakthrough time for cartridges prepared with CO2 activated AC/CNF was 117 minutes which are significantly longer than for those cartridges prepared with walnut shell- based activated carbon with the same weight of adsorbents. This study showed that a granular form CO2 activated AC/CNF composite could be a very effective alternate adsorbent for respirator cartridges due to its larger adsorption capacities and lower weight.

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Section: Discussionsupporting

confidence: 74%

Preparation of a new adsorbent from activated carbon and carbon nanofiber (AC/CNF) for manufacturing organic-vacbpour respirator cartridge

Jahangiri

Javad

Shahtaheri

et al. 2013

J Environ Health Sci Engineer

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“…CMS exhibits excellent advantages compared with AC, such as outstanding and sharp selectivity for the adsorption of planar molecules, narrow pore size distribution, higher hydrophobicity, higher resistance to both alkaline and acid media, and thermal stability at high temperatures under inert atmosphere (Horikawa et al, 2002). An efficient CMS is defined by two major properties: (1) selectivity for the adsorption of one of the species in a gas mixture to be separated and (2) adsorption capacity for this species (Kawabuchi et al, 1998). These properties find a wide range of applications in the field of separation and purification of gas mixture by adsorption, and have been proven by its practical uses in the field of catalysis, membrane and separation of gaseous mixtures via pressure swing adsorption (PSA) and environmental technology purposes (Foley et al, 1993.…”

Section: Introductionmentioning

confidence: 99%

Biomass-based palm shell activated carbon and palm shell carbon molecular sieve as gas separation adsorbents

et al. 2015

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Lignocellulosic biomass has been widely recognised as a potential low-cost source for the production of high added value materials and proved to be a good precursor for the production of activated carbons. One of such valuable biomasses used for the production of activated carbons is palm shell. Palm shell (endocarp) is an abundant by-product produced from the palm oil industries throughout tropical countries. Palm shell activated carbon and palm shell carbon molecular sieve has been widely applied in various environmental pollution control technologies, mainly owing to its high adsorption performance, well-developed porosity and low cost, leading to potential applications in gas-phase separation using adsorption processes. This mini-review represents a comprehensive overview of the palm shell activated carbon and palm shell carbon molecular sieve preparation method, physicochemical properties and feasibility of palm shell activated carbon and palm shell carbon molecular sieve in gas separation processes. Some of the limitations are outlined and suggestions for future improvements are pointed out.

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“…The Weber-Morris kinetic model [28] mainly describes the diffusion process of substances in the internal pores of the particles during the solid adsorption process. It is not suitable for surface diffusion controlled reactions, as shown in Equation (10). The Elovich kinetic model [29] is based on the Temkin adsorption isotherm equation and describes a series of reaction mechanism processes, including surface diffusion, internal diffusion, activation, and deactivation, etc.…”

Section: Kinetic Modelsmentioning

confidence: 99%

“…Therefore, the capture, storage, and utilization of CO 2 in coal-fired power plants have important practical significance for mitigating global warming [1][2][3]. The current CO 2 emission reduction technology routes of coal-fired power plants mainly are: integrated gas gasification combined cycle (IGCC) technology [4], oxygen-rich combustion system [5,6], chemical chain combustion technology [7,8], physical adsorption [9,10], and chemical absorption method [11]. For existing traditional coal-fired power plants, physical adsorption and chemical absorption methods are more practical methods because they do not require much change in the layout of the power plants.…”

Section: Introductionmentioning

confidence: 99%

Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents

et al. 2020

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In this paper, a silica aerogel support was prepared by two-step sol–gel method, and the active component K2CO3 was supported on the support by wet loading to obtain a modified potassium-based CO2 adsorbent. As the influences of reaction conditions on the CO2 capture characteristics of modified potassium-based adsorbents, the reaction temperature (50 °C, 60 °C, 70 °C, 80 °C), water vapor concentration (10%, 15%, 20%), CO2 concentration (5%, 10%, 12.5%, 15%), and total gas flow rate (400 mL/min, 500 mL/min, 600 mL/min) were studied in a self-designed fixed-bed reactor. At the same time, the low-temperature nitrogen adsorption experiment, scanning electron microscope, and X-ray diffractometer were used to study the microscopic characteristics of modified potassium-based adsorbents before and after the reaction. The results show that the silica aerogel prepared by the two-step sol–gel method has an excellent microstructure, and its specific surface area and specific pore volume are as high as 838.9 m2/g and 0.85 cm3/g, respectively. The microstructure of K2CO3 loaded on the support is improved, which promotes the CO2 adsorption performance of potassium-based adsorbents. The adsorption of CO2 by potassium-based adsorbents can be better described by the Avrami fractional kinetic model and the modified Avrami fractional kinetic model, and it is a complex multi-path adsorption process, which is related to the adsorption site and activity. The optimal adsorption temperature, water vapor concentration, CO2 concentration, and total gas volume were 60 °C, 15%, 12.5%, and 500 mL/min, respectively.

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The modification of pore size in activated carbon fibers by chemical vapor deposition and its effects on molecular sieve selectivity

Cited by 61 publications

References 12 publications

Preparation of a new adsorbent from activated carbon and carbon nanofiber (AC/CNF) for manufacturing organic-vacbpour respirator cartridge

Preparation of a new adsorbent from activated carbon and carbon nanofiber (AC/CNF) for manufacturing organic-vacbpour respirator cartridge

Biomass-based palm shell activated carbon and palm shell carbon molecular sieve as gas separation adsorbents

Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents

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