Efficiency of catalyst-coated ceramic filter with acid treatment
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Ceramic filter was prepared using cordierite powder and it was coated with V2O5 catalyst by vacuum impregnation method. The filter had the apparent porosity of 58 %, the compressive strength of 10 MPa and the pressure drop of 1200 Pa at the face velocity of 5 cm/sec and 400 ℃. NOx removal efficiency of only V2O5 coated on cordierite filter showed the removal efficiency of 80 %, and it was improved up to 90 % by increasing specific surface area of filter elements from the acid treatment. The high surface area is due to the removal of Mg and Al ions from the silicate structure and subsequent generation of free amorphous silicate on the surface of the cordierite.
Abstract
코디어라이트를 원료로 하여 다공성 세라믹 필터를 제조하였고, 진공함침법으로 V2O5 촉매를 코팅하였다. 제조된 세라믹 필터의 기공률은 58 %, 압축강도는 10 MPa, 400℃, 5 cm/sec의 유속에서 압력손실은 1,200 Pa이었다. V2O5 촉매의 경우 NOx에 대해 80 % 이상의 처리효율을 나타내었고, 산처리에 의한 필터의 비표면적 증가를 통해 처리효율을 약10 % 개선할 수 있었다. 이는 필터의 비표면적 증가를 통해 코팅된 촉매의 분산성을 향상시킴으로써 촉매의 활성점이 증대되었기 때문으로 판단된다. drop of 1200 Pa at the face velocity of 5 cm/sec and 400℃. NOx removal efficiency of only V2O5 coated on cordierite filter showed the removal efficiency of 80 %, and it was improved up to 90 % by increasing specific surface area of filter elements from the acid treatment. The high surface area is due to the removal of Mg and Al ions from the silicate structure and subsequent generation of free amorphous silicate on the surface of the cordierite.
참고문헌 (11)
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