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Title (Primary) The role of nickel traces in fine chemicals for hydrodechlorination reactions with zero-valent iron
Author Balda, M.; Kopinke, F.-D.;
Journal Chemical Engineering Journal
Year 2020
Department TUCHEM;
Volume 388
Language englisch;
POF III (all) T41;
Supplements https://ars.els-cdn.com/content/image/1-s2.0-S1385894720301765-mmc1.docx
Keywords Hydrodechlorination; Zero-valent ironn; Nickel traces; Monochlorobenzene
Abstract Two different types of nanoscale zero-valent iron (nZVI) were synthesized according to the same standard procedure: reduction of dissolved Fe(II) with sodium borohydride – one starting from a commercial iron salt having pro analysi (p.a.) purity, and another from microscale iron with an extraordinary degree of purity, derived from the decomposition of iron pentacarbonyl. The ZVI samples exhibited similar hydrodechlorination activities towards hexachlorobenzene as an example for higher chlorinated aromatics and carbon tetrachloride as an aliphatic model substance. However, only the sample derived from the iron salt (p.a.) was able to dechlorinate monochlorobenzene (MCB) at a measurable rate whereas the nZVI derived from the very pure precursor (nZVIpure) did not show this ability. Closer inspection lead us to the finding that the observed activity could be attributed to a Ni content as small as 0.005 wt.-% of the former nZVI sample which was named nZVIimpure accordingly. It was demonstrated that such a small amount of Ni develops its catalytic activity for the hydrodechlorination of MCB only under acidic conditions. Although acidic conditions might not be common for studies with ZVI, higher Ni contents (e.g. of reagent grade iron sources) could have an influence under ambient conditions.
ID 22754
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=22754
Balda, M., Kopinke, F.-D. (2020):
The role of nickel traces in fine chemicals for hydrodechlorination reactions with zero-valent iron
Chem. Eng. J. 388 , art. 124185