Ruthenium catalyst dispersed on Titania, prepared with wet impregnation using a Rotary evaporator. View from the top of the spherical bottle after the evaporation of the water. The catalyst, not yet ready, is the dry paste covering the walls of the bottle. Notice the cracks of the thin film of the paste. This paste is collected by scraping and baked at high temperature to remove the unwanted molecules of the Ru-precursor.