DAIS - Digital Archive of the Serbian Academy of Sciences and Arts
    • English
    • Српски
    • Српски (Serbia)
  • English 
    • English
    • Serbian (Cyrilic)
    • Serbian (Latin)
  • Login
View Item 
  •   DAIS
  • Институт техничких наука САНУ / Institute of Technical Sciences of SASA
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
  • View Item
  •   DAIS
  • Институт техничких наука САНУ / Institute of Technical Sciences of SASA
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Fe–Mo alloy coatings as cathodes in chlorate production process

Thumbnail
2016
1967.pdf (306.7Kb)
Authors
Gajić Krstajić, Ljiljana
Elezović, Nevenka
Jović, Borka
Martelli, Gian N.
Jović, Vladimir
Krstajić, Nedeljko
Article (Published version)
Metadata
Show full item record
Abstract
The aim of this study was to gain a better understanding of the feasibility of partial replacement of dichromate, Cr(VI), with phosphate buffer, focusing on the cathode reaction selectivity for hydrogen evolution on mild steel and Fe-Mo cathodes in undivided cell for chlorate production. To evaluate the ability of phosphate and Cr(VI) additions to hinder hypochlorite and chlorate reduction, overall current efficiency (CE) measurements in laboratory cell for chlorate production on stationary electrodes were performed. The concentration of hypochlorite was determined by a conventional potentiometric titration method using 0.01 mol dm-3 As2O3 solution as a titrant. The chlorate concentration was determined by excess of 1.0 mol dm-3 As2O3 solution and excess of arsenic oxide was titrated with 0.1 mol dm-3 KBrO3 solution in a strong acidic solution. Cathodic hypochlorite and chlorate reduction were suppressed efficiently by addition of 3 g dm-3 dichromate at both cathodes, except that Fe-Mo... cathode exhibited higher catalytic activity for hydrogen evolution reaction (HER). The overvoltage for the HER was around 0.17 V lower on Fe-Mo cathode than on mild steel at the current density of 3 kA m-2. It was found that a dichromate content as low as 0.1 g dm-3 is sufficient for complete suppression of cathodic hypochlorite and chlorate reduction onto Fe-Mo catalyst in phosphate buffering system (3 g dm-3 Na2HPO4 + NaH2PO4). The overall current efficiency was practically the same as in the case of the presence of 3 g dm-3 dichromate buffer (98 %). However, for the mild steel cathode, the overall current efficiency for the chlorate production was somewhat lower in the above mentioned mixed phosphate + dichromate buffering system (95%) than in the pure dichromate buffering solution (97.5%).

Keywords:
chlorate production / current efficiency / Fe–Mo cathode catalyst / phosphate buffer
Source:
Hemijska industrija, 2016, 70, 1, 81-89
Publisher:
  • Belgrade Association of the Chemical Engineers of Serbia
Projects:
  • Development, characterization and application nanostructured and composite electrocatalysts and interactive supports for fuel cells and water electrolysis (RS-172054)

DOI: 10.2298/HEMIND150119014G

ISSN: 0367-598X (Print); 2217-7426 (Online)

WoS: 000372733800010

Scopus: 2-s2.0-84960342547
[ Google Scholar ]
5
4
URI
http://dais.sanu.ac.rs/123456789/15969
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - JOUR
AU  - Gajić Krstajić, Ljiljana
AU  - Elezović, Nevenka
AU  - Jović, Borka
AU  - Martelli, Gian N.
AU  - Jović, Vladimir
AU  - Krstajić, Nedeljko
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/15969
AB  - The aim of this study was to gain a better understanding of the feasibility of partial replacement of dichromate, Cr(VI), with phosphate buffer, focusing on the cathode reaction selectivity for hydrogen evolution on mild steel and Fe-Mo cathodes in undivided cell for chlorate production. To evaluate the ability of phosphate and Cr(VI) additions to hinder hypochlorite and chlorate reduction, overall current efficiency (CE) measurements in laboratory cell for chlorate production on stationary electrodes were performed. The concentration of hypochlorite was determined by a conventional potentiometric titration method using 0.01 mol dm-3 As2O3 solution as a titrant. The chlorate concentration was determined by excess of 1.0 mol dm-3 As2O3 solution and excess of arsenic oxide was titrated with 0.1 mol dm-3 KBrO3 solution in a strong acidic solution. Cathodic hypochlorite and chlorate reduction were suppressed efficiently by addition of 3 g dm-3 dichromate at both cathodes, except that Fe-Mo cathode exhibited higher catalytic activity for hydrogen evolution reaction (HER). The overvoltage for the HER was around 0.17 V lower on Fe-Mo cathode than on mild steel at the current density of 3 kA m-2. It was found that a dichromate content as low as 0.1 g dm-3 is sufficient for complete suppression of cathodic hypochlorite and chlorate reduction onto Fe-Mo catalyst in phosphate buffering system (3 g dm-3 Na2HPO4 + NaH2PO4). The overall current efficiency was practically the same as in the case of the presence of 3 g dm-3 dichromate buffer (98 %). However, for the mild steel cathode, the overall current efficiency for the chlorate production was somewhat lower in the above mentioned mixed phosphate + dichromate buffering system (95%) than in the pure dichromate buffering solution (97.5%).
PB  - Belgrade Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Fe–Mo alloy coatings as cathodes in chlorate production process
SP  - 81
EP  - 89
VL  - 70
IS  - 1
DO  - 10.2298/HEMIND150119014G
ER  - 
@article{
author = "Gajić Krstajić, Ljiljana and Elezović, Nevenka and Jović, Borka and Martelli, Gian N. and Jović, Vladimir and Krstajić, Nedeljko",
year = "2016",
url = "http://dais.sanu.ac.rs/123456789/15969",
abstract = "The aim of this study was to gain a better understanding of the feasibility of partial replacement of dichromate, Cr(VI), with phosphate buffer, focusing on the cathode reaction selectivity for hydrogen evolution on mild steel and Fe-Mo cathodes in undivided cell for chlorate production. To evaluate the ability of phosphate and Cr(VI) additions to hinder hypochlorite and chlorate reduction, overall current efficiency (CE) measurements in laboratory cell for chlorate production on stationary electrodes were performed. The concentration of hypochlorite was determined by a conventional potentiometric titration method using 0.01 mol dm-3 As2O3 solution as a titrant. The chlorate concentration was determined by excess of 1.0 mol dm-3 As2O3 solution and excess of arsenic oxide was titrated with 0.1 mol dm-3 KBrO3 solution in a strong acidic solution. Cathodic hypochlorite and chlorate reduction were suppressed efficiently by addition of 3 g dm-3 dichromate at both cathodes, except that Fe-Mo cathode exhibited higher catalytic activity for hydrogen evolution reaction (HER). The overvoltage for the HER was around 0.17 V lower on Fe-Mo cathode than on mild steel at the current density of 3 kA m-2. It was found that a dichromate content as low as 0.1 g dm-3 is sufficient for complete suppression of cathodic hypochlorite and chlorate reduction onto Fe-Mo catalyst in phosphate buffering system (3 g dm-3 Na2HPO4 + NaH2PO4). The overall current efficiency was practically the same as in the case of the presence of 3 g dm-3 dichromate buffer (98 %). However, for the mild steel cathode, the overall current efficiency for the chlorate production was somewhat lower in the above mentioned mixed phosphate + dichromate buffering system (95%) than in the pure dichromate buffering solution (97.5%).",
publisher = "Belgrade Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Fe–Mo alloy coatings as cathodes in chlorate production process",
pages = "81-89",
volume = "70",
number = "1",
doi = "10.2298/HEMIND150119014G"
}
Gajić Krstajić L, Elezović N, Jović B, Martelli GN, Jović V, Krstajić N. Fe–Mo alloy coatings as cathodes in chlorate production process. Hemijska industrija. 2016;70(1):81-89
Gajić Krstajić, L., Elezović, N., Jović, B., Martelli, G. N., Jović, V.,& Krstajić, N. (2016). Fe–Mo alloy coatings as cathodes in chlorate production process.
Hemijska industrijaBelgrade Association of the Chemical Engineers of Serbia., 70(1), 81-89. 
https://doi.org/10.2298/HEMIND150119014G
Gajić Krstajić Ljiljana, Elezović Nevenka, Jović Borka, Martelli Gian N., Jović Vladimir, Krstajić Nedeljko, "Fe–Mo alloy coatings as cathodes in chlorate production process" 70, no. 1 (2016):81-89,
https://doi.org/10.2298/HEMIND150119014G .

DSpace software copyright © 2002-2015  DuraSpace
About DAIS - Digital Archive of the Serbian Academy of Sciences and Arts | Send Feedback

re3dataOpenAIRERCUB
 

 

All of DSpaceInstitutionsAuthorsTitlesSubjectsThis institutionAuthorsTitlesSubjects

Statistics

View Usage Statistics

DSpace software copyright © 2002-2015  DuraSpace
About DAIS - Digital Archive of the Serbian Academy of Sciences and Arts | Send Feedback

re3dataOpenAIRERCUB