알칼리 및 알칼리 토금속에 의한 SCR 촉매 비활성 거동
The deactivation behavior of SCR catalyst by alkali and alkali earth metal
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초록
알칼리(토)금속이 SCR(Selective Catalytic Reduction) 촉매 비활성화에 미치는영향을 미세구조, 촉매 비표면적, 기공 부피 변화, 탈질 성능 분석을 통해 규명하였다. 신촉매를 350℃에서 6시간 동안 H3PO4, K2CO3, Na2CO3, Ca(CH3COO)2 · H2O, C4H6MgO4· 4H2O 수용액을 분사 시켜, 모사 피독된 SCR 촉매를 제조하였다. 피독 촉매 표면의 미세구조는 신촉매와거의 유사한 형태를 보이지만, 비표면적과 기공 부피 변화를 신촉매와 비교하였을 때, Na<Mg < K < Ca < P 순으로 감소하는 것으로 나타났다. 특히 Na에 의해 피독된 촉매는 비표면적은 10.20 m 2 /g, 기공부피는 0.061 cm 2 /g 정도 감소하였다. 150~ 450 o C에서 신촉매 및 피독 촉매의 탈질성능을 평가한 결과, 알칼리 금속(K, Na)에 피독된 SCR 촉매가 가장 낮은 탈질효율을 보였으며, 알칼리 토금속(Ca, Mg)에 피독된 SCR 촉매는 알칼리 금속(K, Na)에 피독된 촉매에 비해 상대적으로 높은 탈질 효율을 보였으며, 인(P)에 의해 피독된 촉매는 SCR 신촉매와 거의 유사한 탈질 성능을 나타내는 것을 확인하였다. 이러한 결과는 SCR 촉매 비표면적이나 기공 부피 감소에 따른 물리적인 비활성화가 SCR 촉매 탈질 성능에 영향을 미치는 것으로 보인다.
Abstract
The effect of the alkali, alkali earth metal elements on selective catalytic reduction(SCR) catalyst deactivation behavior were investigated in terms of microstructure, surface area, pore volume and De-NOx test. Poisoned SCR catalyst were manufactured by injection of K2CO3, Na2CO3, Ca(CH3COO)2 · H2O, C4H6MgO4 · 4H2O, H3PO4 solutions in the new SCR catalyst at 350 o C for 6 hours. New and poisoned catalysts surface were similar. But specific surface area, pore volume decrease from Na, Mg, K, Ca, P compared to new SCR catalyst. Especially, Na poisoned catalyst surface area and pore size extremely decreased by 10.20 m 2 /g, 0.061 cm 2 /g. De-NOx test results of new and poisoned catalysts at 150~450 o C indicated that alkali metal (K, Na) poisoned SCR catalysts have the lowest De-NOx efficiency, alkali earth metal poisoned SCR catalysts (Ca, Mg) De-NOx efficiency are higher than alkali metal poisoned SCR catalysts. P poisoned SCR catalyst De-NOx efficiency is similar new SCR catalyst. It were considered that physical deactivation of SCR catalyst was affected by SCR catalyst surface area and pore volume change.
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