Xiaodong Ma

Preparation, characterization and catalytic behavior of hierachically porous CuO/α-Fe2O3/SiO2 composite material for CO and o-DCB oxidation

Abstract Hierachically porous (HP) CuO/α-Fe 2 O 3 /SiC 2 composite material was fabricated by sol-gel method and multi-hydrothermal processes using HP-S 1 O 2 as support. The resulting material was characterized by N 2 adsorption-desorption, X-ray diffraction and scanning electron microscopy. The as-prepared CuO/Fe 2 O 3 /HP-SiC 2 sample, with α-Fe 2 CO 3 and CuO nanocrystals, possessed a co-continuous skeleton, through-macroporous and mesoporous structure. Its catalytic behavior for CO and o -DCB oxidation was investigated. The result showed that CuO/Fe 2 O 3 /HP-SiCO 2 catalyst exhibited high catalytic activity for both CO and o -DCB oxidation, indicating its potential application in combined abatement of CO and chlorinated volatile organic compounds.

Low temperature H2S sensor based on copper oxide/tin dioxide thick film

Abstract Nanostructured tin dioxide (SnO 2 ) powders were prepared by a sol-gel dialytic process and and the doping of CuO on it was completed by a deposition-precipitation method. The thick film sensors were fabricated from the CuO/SnO 2 polycrystalline powders. Sensing behavior of the sensor was investigated with various gases including CO, H 2 , NH 3 , hexane, acetone, ethanol, methanol and H 2 S in air. The as-synthesized gas sensor had much better response to H 2 S than to other gases. At the same time, the CuO/SnO 2 sensor had enough sensitivity, together with fast response and recovery, to distinguish H 2 S from those gases at 160 and 210 °C. Therefore, it might have promising applications in the future.

Hierarchically porous Fe2O3/CuO composite monoliths: Synthesis and characterization

Abstract In this paper, hierarchically porous Fe 2 O 3 /CuO composite monoliths were first successfully synthesized by a mild method using silica monoliths as templates. The structure of composite monoliths was characterized by X-ray diffraction, scanning electron microscopy, nitrogen adsorption-desorption. The results indicated that the molar ratio of Fe to Cu had a great influence on the crystal phase of Fe 2 O 3 , pore size and the structure of the macroporous wall. The Fe 2 O 3 /CuO composite monoliths consist of hierarchically macroporous and mesoporous structure, while the sample with the Fe/Cu molar ratio of 2: 1 possesses tighter wall structure than other samples. It is expected that as-prepared Fe 2 O 3 /CuO composite monoliths have potential applications in several fields as catalysts, catalyst supports, chemical sensors and high-performance liquid chromatography (HPLC).