A lab-scale experimental apparatus was used to investigate mercury removal using particles generated from a simulated flue gas containing 10-40 ppb of gaseous elemental mercury at 178 degreesC. This operating temperature was chosen to represent the flue gas temperature after the air preheater in a typical power plant. The particles, mostly ammonium sulfates as confirmed by X-ray diffraction, were generated by the gas-phase reaction of SO3 and NH3 by maintaining 20-50 PPM SO3 with NH3/SO3 molar ratio of 2. The generated particles were captured by the glass-fiber filter which was also maintained at 178 degreesC. The results showed that as high as 49% of elemental mercury was captured by the particles.