Abstract
Microwave-induced plasma under atmospheric pressure is an effective technique for catalyst preparation. A Pd/Al2O3 catalyst was prepared using a fixed bed with microwave plasma irradiation. The activity of the catalyst was compared with that of catalysts made using the plasma spouted bed and the conventional furnace. From the results of X-ray powder diffraction (XRD) spectra and transmission electron microscopy (TEM) images, plasma treatment induced a rapid reduction process (PdO→Pd). Moreover, the plasma treatment derived the growth of a different facet from Pd (111) to Pd (100). A different kind of phase transition behavior was observed with plasma-treated alumina. H2 chemisorption analysis confirmed that the plasma treatment had a positive effect on the dispersion of Pd metal on the support. These improvements to the properties of the catalyst resulted in excellent performance in hydrogenation of acetylene.
Highlights
Plasma, considered as the fourth state of matter, is a partially ionized gas that contains excited species as radicals
The reaction temperature was set to 120 ◦C, and 20 mg of the Pd/Al2O3 catalyst was added to the middle of the reactor
A fixed bed with microwave-induced plasma jet irradiation was applied for a Pd/Al2O3 catalyst’s preparation
Summary
Plasma, considered as the fourth state of matter, is a partially ionized gas that contains excited species as radicals. Plasma has been introduced into various catalyst preparation processes as an alternative to conventional thermal treatment [1,2,3,4,5,6,7]. Plasma treatment results in production of catalysts that possess different crystal structures, which could yield an improvement in carbon resistance [6].
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