Deposition of activated alumina powder on SiC diesel particulate filters with wall flow type through in-situ hydrothermal process

• Successful deposition of activated alumina over SiC-DPF surface
• Influence of urea and glycerol on the layer thickness of alumina powder
• Increasing of surface areas after SiC-DPF coating to 28 m2 g− 1supp
• Influence of contact time of washcoating on layer thickness

A modified mesoporous alumina powder by urea mass percent and glycerol addition was deposited on SiC diesel particulate filters (SiC-DPFs). The activated alumina layer was successively synthesized by a surfactant-templating route through in-situ hydrothermal technique with the aim of depositing homogeneous and well-adhered layers. The effect of the urea mass percent and glycerol addition on the deposition process was also examined.The mineral phase, surface area and structural morphology of the activated alumina layers were investigated by different physicochemical techniques such as X-ray diffraction, N2-physisorption and scanning electron microscopy. The resultant deposited alumina powder layers possessed surface areas and pore volumes of about 20–28 m2 g− 1supp and 0.15–0.31 cm3 g− 1, respectively.

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