Catalysts Based on PdO_ZrO2 in the Hydrodechlorination Reaction of Chlorobenzeneстатья
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Дата последнего поиска статьи во внешних источниках: 20 января 2016 г.
Аннотация:The possibility of using mixed oxides of palladium and zirconium obtained with biotemplates (cellulose
and wood pulp) as the precursor of catalysts for the hydrodechlorination of chlorobenzene is analyzed.
The properties of the samples are studied by means of scanning electron microscopy (SEM), transmission
electron microscopy (TEM), the Brunauer–Emmet–Teller (BET) method, and temperature-programmed
reduction (TPR). They are then compared to the properties of a supported analogue. The biomorphic precursors
are characterized by high porosity and include micropores, mesopores, and macropores; the results
from TPR reveal the presence in the precursors of several forms of PdO that differ by reduction temperature.
It is shown that the distribution of palladium in the catalysts obtained by reducing the precursors with hydrogen
depends on the method used in synthesizing the precursor. It is shown that the studied catalysts ensure
100% conversion of chlorobenzene at temperatures of 100 to 250°C. It is established that cyclohexane is the
principal product in the presence of the supported catalyst across the range of temperatures, while cyclohexane
and benzene are detected among the products in the presence of biomorphous samples at temperatures
above 130°C. The effect the presence of an admixture of alkaline and alkaline-earth metals in the catalyst has
on the selectivity of the process is noted. It is established that the catalysts operate in a stable manner for at
least 27 h of use under experimental conditions.