Activation Mechanism, Surface Properties and Adsorption Characteristics of KOH Activated High Surface Area Carbon

Otowa, Toshiro; Nojima, Yutaka; Itoh, Masao

doi:10.1007/978-1-4613-1375-5_88

Cited by 14 publications

(14 citation statements)

References 5 publications

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“…Prior to prepare carbon-supported platinum nanoparticles as a dehydrogenation catalyst (Pt/C, 5 wt-metal %), a support pretreatment toward granular activated carbon with an aqueous solution of NaOH (pH 14) was carried out by immersing for 24 h in order to promote the anion exchange between the ligand chloride of impregnated metal precursers (K 2 PtCl 4 ) and the aqueous hydroxide ion (OH − ) inside the micropores of activated carbon . A platinum catalyst supported on the granular activated carbon (KOH-activation, BET specific surface area 3100 m 2 /g, pore volume 1.78 cm 3 /g, average particle size 13 µm, average pore size 2.0 nm, Kansai Netsukagaku Co. Ltd – , First, granular powders of the base-pretreated activated carbon were stirred with a K 2 PtCl 4 aqueous solution at room temperature for 48 h, which was followed by dropwise addition of a NaBH 4 aqueous solution at 90 °C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Chemical Recuperation of Low-Quality Waste Heats by Catalytic Dehydrogenation of Organic Chemical Hydrides and Its Exergy Analysis

2008

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Any technological breakthrough on storage, transportation, and distribution of hydrogen is urgently required to popularize hydrogen energy systems. In the present paper, organic chemical hydrides with appropriate characteristics (e.g., high storage capacities, facile reversibility, and being safe and cost-competitive), consisting of reversible catalysis pairs such as methylcyclohexane dehydrogenation/toluene hydrogenation and decalin dehydrogenation/naphthalene hydrogenation, have been proposed as the suitable materials for carrying hydrogen. Efficient hydrogen generation from organic chemical hydrides at moderate heating temperatures lower than 300 °C, being low enough to avoid serious coke formation over catalyst surface, was accomplished only by using carbon-supported nanosize platinum catalysts in superheated liquid-film states. Desorption of products from catalytic active sites was enhanced with the temperature gradient formed in the superheated liquid-film state, so that both high catalytic conversions and reaction rates were attained simultaneously in spite of unfavorable temperatures for dehydrogenation. Adoption of the superheated liquid-film-type catalysis will make it possible to utilize low-quality waste heats below 300 °C as the heat source for endothermic dehydrogenation. Exhausted waste heat can be recuperated as chemical energy through the superheated liquid-film-type dehydrogenation of organic chemical hydrides, with hydrogen used for vehicles or stationary fuel cells. Exergy loss in the hydrogen storage and transportation systems ought to be suppressed through the chemical recuperation of waste heat by use of organic chemical hydrides. An exergy analysis in automotive application has revealed that organic chemical hydrides are superior to compressed hydrogen and liquefied hydrogen in terms of total exergy consumption.

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Section: Methodsmentioning

confidence: 99%

Chemical Recuperation of Low-Quality Waste Heats by Catalytic Dehydrogenation of Organic Chemical Hydrides and Its Exergy Analysis

2008

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“…The results of density determination and the values calculated from (1) and (2) are given in Table 1. It is clear from Table 1 that the reduction of potassium hydroxide to metallic potassium [10] may cause an increase in for Picazine K, and, in this way, affect the value of the pore volume and total porosity.…”

Section: Densitiesmentioning

confidence: 99%

Preparation of Active Carbon by Additional Activation with Potassium Hydroxide and Characterization of Their Properties

Buczek

2016

Advances in Materials Science and Engineering

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A commercially available activated carbon was used to prepare active carbonviareactivation with KOH at 750°C. Active carbon was obtained with 60.5% yield. The resulting active carbon showed a well-developed porous structure with specific surface area 2939 m2/g, total pore volume 1.488 cm3/g, and micropore volume 1.001 cm3/g. Process reactivation of carbon changes its particle size as well as density properties and increases by nearly twice the amounts of methane and carbon dioxide adsorbed under high pressure conditions. Such active carbon may be used to enrich methane or carbon dioxide by pressure swing adsorption technique. Other possible applications of reactivated carbon are storage of hydrogen and methane and sequestration of carbon dioxide.

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“…Prior to preparing carbon-supported platinum catalysts by the conventional impregnation method [2][3][4][5][6][7][8][9][10][11][12][13], a support pretreatment toward granular activated carbon (KOHactivation, BET specific surface area: 3100 m 2 /g, pore volume: 1.78 cm 3 /g, average pore size: 2.0 nm, average particle size: 13 mm, Kansai Netsukagaku Co. Ltd.) [20] with an aqueous solution of NaOH (pH 14) was carried out by immersing the material for 24 h in order to promote the anion exchange between the base OH À and the ligand Cl À of the impregnated metal precursors (K 2 PtCl 4 ) in the micropores of the activated carbon [21].…”

Section: Catalyst Preparationmentioning

confidence: 99%

Efficient hydrogen supply from tetralin with superheated liquid-film-type catalysis for operating fuel cells

Hodoshima

Nagata

Saito

2005

Applied Catalysis A: General

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Activation Mechanism, Surface Properties and Adsorption Characteristics of KOH Activated High Surface Area Carbon

Cited by 14 publications

References 5 publications

Chemical Recuperation of Low-Quality Waste Heats by Catalytic Dehydrogenation of Organic Chemical Hydrides and Its Exergy Analysis

Chemical Recuperation of Low-Quality Waste Heats by Catalytic Dehydrogenation of Organic Chemical Hydrides and Its Exergy Analysis

Preparation of Active Carbon by Additional Activation with Potassium Hydroxide and Characterization of Their Properties

Efficient hydrogen supply from tetralin with superheated liquid-film-type catalysis for operating fuel cells

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