Experimental procedure for kinetic studies on egg-shell catalystsThe case of liquid-phase hydrogenation of 1,3-butadiene and n-butenes on commercial Pd catalysts

Kinetic study of the selective catalytic hydrogenation of 1,3-butadiene in a mixture of n-butenes

“…The main objective of the purification procedure was to minimize the presence of moisture in the reaction mixture, because it severely impairs the catalyst activity [17].…”

Kinetic study of the liquid-phase selective hydrogenation of 1-butyne in presence of 1-butene over a commercial palladium-based catalyst

“…Before each run, the compounds fed to the experimental system were purified as is described in the next paragraph. The main target of the purification procedure was to minimize the presence of moisture in the reaction mixture because it severely impairs the catalyst activity (Ardiaca et al, 2001).…”

“…A detailed description of the experimental system design was previously published (Ardiaca et al, 2001). So, in this paper we will only highlight the main features of the experimental set-up and protocol.…”

“…1 (Ardiaca et al, 2001), that hydrogenation of C 4 unsaturated compounds over palladium is so fast that the concentration drop across the liquid film that surrounds the catalyst pellets cannot be neglected. Therefore, in order to minimize the external film gradients in the external fixed-bed reactor, the maximum flow rate attainable by the gear micropump, 700 ml/min, was selected.…”

“…This observed trend indicates that, within the composition intervals covered in our experiments, 1-butene hydrogenation rate is independent of 1-butene mole fraction. Therefore, according to Ardiaca et al (2001), a zero-order and first-order kinetic expression with respect to 1-butene and hydrogen, respectively, is proposed to model the hydrogenation rate of 1-butene to n-butane when x butyne is nil.…”