Preprint Article Version 2 This version is not peer-reviewed

Comparison of the Properties of Activated Carbons Produced in a One-Stage and a Two-Stage Process

Version 1 : Received: 6 May 2018 / Approved: 7 May 2018 / Online: 7 May 2018 (10:30:25 CEST)
Version 2 : Received: 14 June 2018 / Approved: 25 June 2018 / Online: 25 June 2018 (05:08:15 CEST)

A peer-reviewed article of this Preprint also exists.

Bergna, D.; Varila, T.; Romar, H.; Lassi, U. Comparison of the Properties of Activated Carbons Produced in One-Stage and Two-Stage Processes. C 2018, 4, 41. Bergna, D.; Varila, T.; Romar, H.; Lassi, U. Comparison of the Properties of Activated Carbons Produced in One-Stage and Two-Stage Processes. C 2018, 4, 41.

Journal reference: C 2018, 4, 41
DOI: 10.3390/c4030041

Abstract

Activated carbons can be produced from biomass in a thermal process either in a direct carbonization-activation process or by first carbonizing the biomass and later on activating the biochars into activated carbons. The properties of the ACs are dependent on the type of process used for production. In this study, the properties of activated carbons produced in a one-stage and a two-stage process are considered. Activated carbons were produced by physical activation of two types of starting materials, bio chars produced from spruce and birch chips in a commercial carbonization plant and from the corresponding raw chips. The activated carbons produced were characterized regarding specific surfaces, pore volumes and pore size distributions. The un-activated bio chars had some degree of surface area 190 and 140 m2g-1 for spruce and birch and pore volumes of 0.067 and 0.092 cm3g-1. According to the results obtained, two slightly different types of activated carbons are produced depending if a one-stage or a two-stage carbonization and activation process is used. The ACs produced in the one-stage process had higher specific surface areas compared to the ones produced in a two-stage process (761-940 m2g-1 vs. 540-650 m2g-1) . In addition, total pore volumes were higher in one-stage process but development of micropores is greater compared to two-stage process. There was no significant difference in total carbon content between one-stage and two-stage process.

Subject Areas

biomass; bio-char; activation; activated carbon; thermal treatment; physical activation; porosity; specific surface areas

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