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Chemistry and Industry of Forest Products ›› 2017, Vol. 37 ›› Issue (3): 1-9.doi: 10.3969/j.issn.0253-2417.2017.03.001

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Review on Phosphoric Acid Activation for Preparation of Activated Carbon (Ⅰ):Roles of Phosphoric Acid

ZUO Songlin   

  1. College of Chemical Engineering, Jiangsu Key Laboratory of Biomass-Based Green Fuels and Chemicals, Nanjing Forestry University, Nanjing 210037, China
  • Received:2017-01-06 Online:2017-06-25 Published:2017-07-03

Abstract: Phosphoric acid activation is a principal method of the chemical activations to produce activated carbons, and has a history of around 30 years in the laboratory-scale investigation and the industrial application. In this article, the author systemically reviewed the roles that phosphoric acid played in the process of H3PO4 activation for the first time. From the chemical point of view, phosphoric acid played in promoting hydrolysis of biopolymers in lignocellulosic materials (1), catalyzing dehydration of biopolymers (2) and aromatization reaction of carbon atoms (3), initiating crosslink reaction with biopolymers (4), and evolution of pores (5). Moreover, three sequential stages were considered to be necessary for the deep incorporation of H3PO4 solution into the interior of botanic structures, which include fast diffusion, hydrolysis and post diffusion. Meantime, the roles that the activating agents play in H3PO4 activation and ZnCl2 activation are compared.

Key words: activated carbon, phosphoric acid, activation

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