A. Loustaunau et al. / Journal of Fluorine Chemistry 132 (2011) 1262–1265
1265
(Zn+Cr) of around 10 wt% and atomic ratios of Zn/(Zn+Cr) equal to 0,
0.15, 0.33, 1. Then the various catalysts were dried at 110 8C during
one night under atmospheric pressure. The precursors were
decomposed during the fluorination of the catalyst by HF at
380 8C during 2 h in a dynamic flow reactor to produce the
corresponding fluorinated or oxyfluorinated materials. Chemical
analyses of the elements (chromium, zinc) were carried out after the
fluorination step.
The various activity was calculated as defined: A (mmol/h/
g) = F*y/weight of catalyst with F: flow of the reactant (mmol/h), y:
yield of each product (mol%).
The activity in mmol/h/mmol metal was obtained by divided
the activity by the total amount of metal.
References
No significant variation of the specific surface could be noticed
whatever the catalyst after the treatment by HF during 2 h, as
reported in a previous paper [16].
Anhydrous Chromic anhydride (99%) was purchased from
Merck, zinc chloride (98%) from Riedel-deHae¨n and methanol
(99.8%) from SDS. They were used without further purification.
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˚
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