Surface modification of a low-density ceramic for gas–solid separation

• Filtration performance of LDC was strongly enhanced after surface modification.
• Pressure drop of LDC increased negligibly after coating with high-viscosity sol.
• Regeneration performance of LDC filter elements was significantly improved.

The surface of low-density ceramic (LDC) material was modified by using high-viscosity silica sol. The optimal preparation parameters for the sol were obtained using an orthogonal experimental design. The influence of the drying condition on the coating quality and even on the value of fine particulate matter after filtering (VFPM2.5) was studied. The coating morphology was characterized by using scanning electron microscope (SEM). The results indicate that the VFPM2.5 decreased from 25.2 μg/m3 to 0.3 μg/m3. The regeneration performance of the LDC filter elements was significantly improved by the surface modification. The baseline pressure drop using the LDC with the coating is less than 138.61 Pa. The results show that the coating makes a negligible effect on the pressure drop in comparison with the conventional method of modification. Moreover, the LDC with the coating demonstrated great isothermal oxidation performance and thermal shock resistance during the filtration process.

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