Simultaneous decomposition and fixation of F-gases using waste concrete

Atsushi Iizuka, Hiroaki Ishizaki, Atsushi Mizukoshi, Miyuki Noguchi, Akihiro Yamasaki, Yukio Yanagisawa

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11 Citations (Scopus)

Abstract

Experimental study was conducted on the simultaneous process of decomposition and fixation of fluoride of F-gases. HFC-134a, a hydrofluorocarbon (HFC), used most widely, was selected as a model gas, and its decomposition performances were examined in a tube type reactor with and without waste concrete powder. Decomposition of HFC-134a was observed at temperatures above 500 °C, while no thermal decomposition occurred below 750 °C without waste concrete. The results for the differential type reactor with high SV demonstrated that the calcium reaction ratio in the waste concrete reached about 50 mol % after 10 min of reaction. Thermal decomposition of HFC-134a was promoted by increasing the reaction temperature. The particle size of the waste concrete within the range studied scarcely affected the decomposition rate. An increase in HFC-134a concentration resulted in a higher calcium reaction ratio of waste concrete. For the integral reactor conditions with packed bed of waste concrete, almost all HFC-134a in the feed gas could be decomposed until 20 min of the reaction time.

Original languageEnglish
Pages (from-to)11808-11814
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume50
Issue number21
DOIs
Publication statusPublished - 2011 Nov 2
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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