Composition, structure, and sorbability of the thermally treated water deironing precipitate with respect to carbon monoxide

Abstract

This work deals with studying the composition, structure, and sorbability of the water deironing precipitate sample thermally treated at 850 °C (WDP-850) with respect to carbon monoxide . According to the data of X-ray fluorescence (XRF) spectroscopy, WDP-850 contains 44.14% of iron, 6.29% of silicon, and 34.78% of oxygen. The results of X-ray diffraction (XRD) analysis indicate the presence of Fe 2 O 3 , Fe 3 O 4 , and SiO 2 nanocrystallites (~ 11.4, 30.6, and 8.0%, respectively). The studies performed via the temperature-programmed desorption of CO show that WDP-850 can sorb carbon monoxide at 25 and 200 °C. The composition and structure of the precipitate sample obtained after CO adsorption at 200 °C (WDP-850-CO) have also been studied. According to XRD data, nearly 9.3% of the silicon carbide (SiC) phase with the moissanite's structure has appeared in the material. The SiC phase is supposed to result from the dissociative adsorption of CO on the surface of WDP-850. It has been concluded that WDP can be used as a base for the synthesis of functional materials, for example, CO sorbents . • The water deironing precipitate (WDP) contained Fe 2 O 3 , Fe 3 O 4 , and SiO 2 nanocrystallites. • The studied precipitate was established to be capable for sorption of CO. • SiC crystallites were identified in the sample of WDP treated with carbon monoxide.