Oxidation modification of Ru-based catalyst for acetylene hydrochlorination

Abstract

To prepare Ru-based catalysts with improved performance, activated carbon (AC) and Ru species were modified with nitric acid by different manners, and the resulting catalysts were characterized via a series of techniques. It was indicated that the oxidation of AC alone did not enhance the activity of the catalyst, but the modification enhanced the interaction between the oxygenated functional groups and Ru species, and the interaction could improve the catalytic performance of the catalysts. A Ru–O/AC–O catalyst prepared by the modification of active components, followed by the modification of AC exhibited outstanding activity and stability with an initial C₂H₂ conversion of 99.6% at 180 °C and a C₂H₂ space velocity of 180 h⁻¹. The modification strengthened the adsorption of reactants, and also ensured the good dispersal of Ru species and augmented the amount of high-valence active species, consequently enhancing the catalytic activity.