Abstract
Present paper deals with analytical control of hydrogenation supported catalysts (Pd/AC) composition using high-resolution continuum source atomic absorption spectrometry with flame atomization (HR-CS FAAS). Catalysts were prepared with expected 3 wt. % Pd content by the simple technique of deposition – reduction of palladium in a basic environment. Formaldehyde was applied as the reduction agent. The working conditions (gas flow and burner height) for determination of the catalytically active component in the prepared Pd/AC catalysts were found. Prior to the analysis by HR-CS FAAS method Pd/AC was subjected to microwave (MW) assisted digestion in the environment of strong oxidizing acids. Appropriate digestion time of 15 min and temperature of 200 °C had been also experimentally obtained.
Highlights
Catalytic hydrogenation represents one of the most used reduction methods and belongs to the group of heterogeneous catalytic processes [1], [2]
In addition to high porosity, the catalyst support should possess other important physical characteristics such as density, pore size and mechanical strength. From this point of view activated carbon is often used for supported catalysts preparation, because of its chemical inertness, thermal stability, specific surface area (500 – 1200 m2 g-1) and financial availability [11]-[13]
The digestion efficiency at different experimental conditions was controlled by determination of the catalytically active component – Pd by HR-CS FAAS method
Summary
Catalytic hydrogenation represents one of the most used reduction methods and belongs to the group of heterogeneous catalytic processes [1], [2]. The working conditions (gas flow and burner height) for determination of the catalytically active component in the prepared Pd/AC catalysts were found. The aim of the presented research is to find the most suitable conditions (time and temperature) for the MW assisted digestion of the prepared Pd/AC catalyst and for determination of the catalytically active component – Pd by HR-CS FAAS method (gas flow and burner height).
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