Sol–gel synthesis, texture and catalytic activity of titania–silica sorbents

• Published in: SN applied sciences Vol. 1; no. 12; p. 1734
• Main Authors: Kouznetsova, T. F., Sidorenko, A. Yu, Ivanets, A. I., Ignat, M., Sauka, Yu. D., Samoila, P.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-12-2019; Springer Nature B.V
• Subjects: 1. Chemistry (general); Adsorption; Adsorptivity; Aldehydes; Anions; Applied and Technical Physics; Catalysts; Catalytic activity; Chemical synthesis; Chemistry/Food Science; Earth Sciences; Engineering; Environment; Fluorides; Isomerization; Low temperature; Materials Science; Nitrogen; Research Article; Selectivity; Silica; Silicon dioxide; Sol-gel processes; Sorbents; Titanium; Titanium dioxide; Zeolites; α-Pinene; United States > US; Titania–silica; MCM-41; Mesopore; Sol–gel; Gas adsorption; Isomerization of α-pinene epoxide
• ISSN: 2523-3963; 2523-3971
• DOI: 10.1007/s42452-019-1781-9

Sol–gel synthesis of mesoporous titania–silicas with the structure related to Type MCM-41 is carried out. The method of nitrogen adsorption has established influence of fluoride-anion on the adsorptive and catalytic properties of titania–silica. The pore structure in titania–silica is in the form of an hexagonal array of uniform tubular channels. Asymptotic increase in a specific surface area of titania–silica catalyst with growth of F/Si ratio is shown. Both silicas and titano-silicas showed catalytic activity in the reaction of isomerization of α-pinene epoxide. The largest activity (100% conversion) and selectivity for campholenic aldehyde (57%) was shown by titanosilicate synthesized at Ti/Si = 25/75 and F/Si = 0.4.
Graphic abstract
Isotherms of nitrogen low-temperature adsorption-desorption and PSD curves for titania-silicas (7, 12) and silica (6) received at presence of fluoride-anion in ratio of F/Si equal: 7–0, 6–0.4, 12–0.4 mol/mol.