High-surface-area active carbon

For their experimental investigation of flow interruption, Haure et al. (1989) chose the catalytic oxidation of S02 over a high-surface-area activated carbon catalyst. Several research groups have studied this catalytic reaction and kinetics are available. It proceeds rapidly at 25°C and is controlled, at least partially, by 02 transport through the liquid phase. 

Enter the pores of the high-surface area activated carbons ... 

Hirano, S., K.S. Young, A. Kwabena and J.A. Schwarz, The high surface area activated carbon hydrogen storage system. Frontiers Sci. Ser., 7 (New Energy Systems and Conversions), 67-72, 1993. 

Otowa, T., Development and application of high surface area activated carbon. Hyoumen (Surface), 34(2), 62-65 (1996). 

The measured uptake of CPA and PTA over the three activated carbons [55] is shown in Figure 6.28, and the trends predicted by the RPA model in Figure 6.27 are at least qualitatively observed. However, at high pH, over the two highest-surface-area carbons (CA and KB), uptake is about half of that predicted by the RPA model. The discrepancy was explained [55] by steric exclusion of the large Pt ammine complexes, believed to retain two hydration sheaths [15,19], from the smallest micropores of the high-surface-area activated carbon. 

O GRADY AND WENNERBERG High-Surface-Area Active Carbon... 

Figure 1. High surface area active carbon.

Table II. Typical Adsorptive Properties High Surface Area Active Carbons ...

Figure 3. High surface area active carbon. Total magnification x 145,480.

Hu, Z., and Srinivasan, M. P., Mesoporous high-surface-area activated carbon, Microporous and Mesoporous Materials 43 (2001) pp.267-275. 

The two-stage process was licensed by Mitsui Mining Company (MMC) in Japan in 1982, and by 1993 a modified form of the process was installed in four commercial plants in Japan and Germany [58]. The granular carbon or activated coke used in this process has a surface area of initially 150 to 250 mVg, which is much lower than that of commercial activated carbons. It is produced from a bituminous coal and a pitch binder. Low surface area carbons have been found to be the most effective in this process they are cheaper than high surface area activated carbons, they retain their SO2 adsorption capacity more efficiently on repeated cycling, and their relatively low porosity contributes to strength and abrasion resistance. 

Economy and Lin [340] investigated the phenol adsorption characteristics of high-surface-area activated carbon fibers Fig. 17b shows that their correlation was not nearly as good, but the role of surface chemistry was not invoked. Additional evidence that the agreement shown in Fig. 17a is more often the exception [439] than the rule is contained in the study of Dondi et al. [342], who u.sed a chromatographic method to determine low-concentration phenol adsorption isotherms on four different carbons, as well as in many other investigations (see, for example. Refs. 356, 382, 384, and 436). 

In this work we have studied ruthenium based catalysts. It is known that ruthenium is among the most active and stable catalysts for the reforming of CH4 with CO2 [2]. As catalystsupport we have used a high surface area activated carbon (AC). In order to improve the catalytic properties of the Ru/AC system, different loadings of magnesium oxide have... 

Small quantities of phosgene (e.g. <1%) may be conveniently removed from inert gas streams by saturating with water vapour and passing through a column of high surface area active carbon at 25 C [565aa]. 

High surface area activated carbon fibers were first prepared by direct carbonization and activation of phenolic fibers in steam/CO2 environment at temperatures around 1000°C (Economy and Lin 1976). These activated carbon flbers, manufactured in the form of a fabric, have received increased attention as adsorbents in air treatment processes. Because these fabrics are easy to handle, there is an increasing demand for them in various applications such as protective fabrics, filtration devices, odor absorbents, and for a wide range of ancillary industrial applications. The high cost of these fabrics has limited their potential use for a number of applications. High cost is also an issue for their use in military applications (Mangun et al. 1999). 

The surface of nanocrystalline MgO has been found to interact strongly with polar organic molecules, such as aldehydes, ketones, and alcohols, by a dissociative chemisorption process, which results in the destruction of the organic molecule. This is in contrast to high-surface-area activated-carbon absorbents, which merely absorb the moiety with no resultant reaction. The chemisorption of acetaldehyde on MgO nanocrystals results in... 

Di Biase, E., Sarkisov, L. Systematic development of predictive molecular models of high surface area activated carbons for adsorption applications. Carbon 64, 262-280 (2013)... 

An important advantage of chemical activation is that the process normally takes place at a lower temperature and shorter time than those used in physical activation. In addition, it allows us to obtain very high surface area activated carbons. Moreover, the yields of carbon in chemical activation are usually higher than in physical activation because the chemical agents used are substances with dehydrogenation properties that inhibit formation of tar and reduce the production of other volatile products [42, 134]. 

Hu ZH, Srinivasan MP, Ni Y (20(X)) Preparation of mesoporous high-surface-area activated carbon. Adv Mater 12 62. 

Ya and ZP prepared carbon molecular sieves from cheap condensed petroleum cokes. The cokes were impregnated with potassium hydroxide and the resulting activated carbon micropore system was modified by cracking of methane or liquefied petroleum gas. The activation of the coke with potassium hydroxide produced high surface area activated carbons with pores of 0.85 nm average diameter. This pore diameter was reduced to between 0.58 and 0.33 nm on deposition of carbon, and the miCTOpore volume remained almost unchanged. 

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