Novel activation process for preparing highly microporous and mesoporous activated carbons

Hu, Zhonghua; Mp, Srinivasan; Ni, Yaming

doi:10.1016/s0008-6223(00)00198-6

Cited by 304 publications

(150 citation statements)

References 18 publications

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“…These results agree with those reported earlier. [13,14] The effects of chemical ratio on BET surface area and micropore volume of ZnCl 2 -activated carbon are shown in Table 1. It shows that surface area as well as the total pore volume increased with the increase in chemical ratio and reached a maximum of 1367 m 2 /g and 0.788 cm 3 /g, respectively.…”

Section: N 2 Adsorption-desorption Isothermsmentioning

confidence: 99%

Surface properties of activated carbon prepared from wastes

Demiral

2008

Surface & Interface Analysis

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Section: N 2 Adsorption-desorption Isothermsmentioning

confidence: 99%

Surface properties of activated carbon prepared from wastes

Demiral

2008

Surface & Interface Analysis

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“…The results for parent samples (non-modified-CHS40-1.00 and CHS40-1.75, respectively) were presented for comparison ▸ and lignin at the presence of ZnCl 2 finishes at ca. 700 °C [26]. The transformation of Zn 2+ complex with much softer chitosan is practically terminated within the range of temperature of 550-600 °C [45,52], and in this work, chitosan-Zn 2+ composite decomposes up to 650 °C.…”

Section: Tga Analysismentioning

confidence: 58%

“…It is possible to modify the hard precursor by means of physical activators (e.g. CO 2 ) [20] or chemically, with ie, KOH [21][22][23] or ZnCl 2 [24][25][26][27][28] after pre-carbonization.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical porous carbon templated with silica spheres of a diameter of 14 nm from pure chitosan or a chitosan/ZnCl2 solution

2018

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Nitrogen-containing mesoporous carbons with the use of colloidal silica spheres of (14 nm) and chitosan as a carbon precursor were obtained. A removal of such small template particles from carbonized silica-chitosan composite is difficult and HF with a minimum concentration of 15 wt% should be used. By varying the silica-to-chitosan ratio, the porous characteristic of products is controlled. The modification by ZnCl 2 with a molar Zn-to-C (in chitosan mass) ratio of '6' results in the development of microporosity; however it is accompanied by a significant reduction of mesopore volume (V mes ). The addition of ZnCl 2 in a ratio of '5.25' and pH adjustment to 5.8 increase the volumes of micropores, small mesopores, BET surface area to 1975 m 2 /g, and preserve V mes of 4.15 cm 3 /g. The novelty of the presented strategy is the creation of microporosity in the hard-templated materials by incorporating ZnCl 2 into the mixture of Ludox HS-40 template and chitosan precursor, as well as the investigation on how the pH of synthesis influences the final porosity. The pH of a silica-chitosan-zinc solution, equal to 3.9, provides some coordination of Zn 2+ by -OH and -NH 2 groups, whereas pH adjustment to 5.8 results in the precipitation of a new template-Zn(OH) 2 .

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“…27,28,29 . These characteristics correspond to materials having pores of slit-like shapes (commonly found for carbons).…”

Section: Resultsmentioning

confidence: 99%

Natural gas storage in microporous carbon obtained from waste of the olive oil production

et al. 2008

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A series of activated carbons (AC) were prepared from waste of the olive oil production in the Cuyo Region, Argentine by two standard methods: a) physical activation by steam and b) chemical activation with ZnCl 2 . The AC samples were characterized by nitrogen adsorption at 77 K and evaluated for natural gas storage purposes through the adsorption of methane at high pressures. The activated carbons showed micropore volumes up to 0.50 cm 3 .g -1 and total pore volumes as high as 0.9 cm 3 .g -1 . The BET surface areas reached, in some cases, more than 1000 m 2 .g -1.The methane adsorption -measured in the range of 1-35 bar-attained values up to 59 V CH4 /V AC and total uptakes of more than 120 cm 3 .g -1 (STP). These preliminary results suggest that Cuyo's olive oil waste is appropriate for obtaining activated carbons for the storage of natural gas.

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Novel activation process for preparing highly microporous and mesoporous activated carbons

Cited by 304 publications

References 18 publications

Surface properties of activated carbon prepared from wastes

Surface properties of activated carbon prepared from wastes

Hierarchical porous carbon templated with silica spheres of a diameter of 14 nm from pure chitosan or a chitosan/ZnCl2 solution

Natural gas storage in microporous carbon obtained from waste of the olive oil production

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