Palladium-Silica Organic-Inorganic Membrane Materials Via a Sol-Gel Process: Preparation and Properties Calcined under H2 Atmosphere
Pd-doped SiO2 organic-inorganic membrane materials were prepared via a sol-gel process.The sol stability is characterized by sol particle size and zeta potential analysis.And the properties of the Pd-doped SiO2 organic-inorganic membrane materials are investigated by X-ray diffraction (XRD), fourier transform infrared (FTIR), energy dispersive spectrum (EDS) analysis and N2 absorption-adsorption measurement.The results showed that the sol particle size distributions are relatively narrow.With the increase of Pd content, the sol particle sizes slightly increase and the zeta potentials decreases until the palladium/tetraethylorthosilicate molar ratio closes to the isoelectric point.After calcined at 350 ℃ under H2 atmosphere, the added PdCl2 is reduced to metallic Pd0 completely, and the hydrophobic Si-CH3 groups exist in the SiO2 network.The Pd atoms have a lower concentration on the surface and more Pd atoms embedded in the SiO2 matrix.The Pd-doped SiO2 membrane materials calcined at 350 ℃ with a palladium/tetraethylorthosilicate molar ratio of 0.15 exhibit large BET surface area (up to 683.36 m2/g) and total pore volume (up to 0.386 cm3/g), as well as a mean pore diameter of about 2.26 nm.
Sol-gel process Silica membrane materials Palladium doping Methyl-modification
Jing Yang Lin-yu Li Hai-yun Hou Zhi Tong
School of Environment & Chemistry Engineering, Xian Polytechnic University, Xian, Shaanxi, China
国际会议
The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)
重庆
英文
889-894
2016-07-25（万方平台首次上网日期，不代表论文的发表时间）