Abstract
This work is devoted to the study of the joint effect of SiO2 and PdOx on the SnO2 sensor properties when detecting CO in dry and humid air. Nanocrystalline SnO2 was obtained by wet chemical synthesis, modification with SiO2 was effectuated during hydrothermal treatment, modification with PdOx was carried out by impregnation method. All sensitive materials characterized by XRD, low-temperature nitrogen adsorption, HRTEM, TPR-H-2, XPS and IR spectroscopy. The sensor characteristics were studied when detecting CO in dry (RH = 1%) and humid (RH = 20%) air. Tin dioxide, jointly modified by SiO2 and PdOx, demonstrates the greatest sensitivity to CO in both dry and humid atmosphere. To explain the cooperative effect of PdOx and SiO2 in CO detection, the interaction of palladium modified samples with CO in dry and humid air was investigated by DRIFT spectroscopy in operando conditions. (C) 2021 Elsevier B.V. All rights reserved.
NSTL
Elsevier