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Alternative Title: The enhancement of sulfur poisoning tolerance in the selective catalytic reduction of NOx by Ag/Al2O3 catalyst

Abstract: The influence of sulfate on the selective catalytic reduction of NOx on the Ag/Al2O3 catalyst was studied when CH4 was used as reductant. Various preparation methods influenced on the de NOx activity. Among the methods, cogelation precipitation gave best activity. When sulfates were formed on the surfaces of sampled prepared by impregnated and deposition precipitation, de NOx activity was enhanced as long as special forming condition is satisfied. Dominant sulfate of Ag/Al2O3 catalyst was aluminum sulfate and it seems that they acted as acid sites.
When Mg was added it promoted de NOx activity at high temperature. The XRD pattern did not show peaks of Mg-Al spinel, which shows that promotion of activity stems from Mg sulfates.
Intentionally added sulfated also enhanced de NOx activity when their amount was confined less 3wt%

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/9504
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001963758

Table Of Contents: 1. 서론 1
2. 이론적 배경 3
2.1 배기가스의 특성 3
2.1.1 질소산화물의 특성 3
2.1.2 NOx의 발생원 5
2.2 배기가스 내의 NOx 저감 기술 10
2.2.1 배연탈질기술 - 연소 전 처리방법 10
2.2.2 배연탈질기술 - 연소 후 처리방법 10
2.3 γ-Al2O3 촉매 18
2.4 Metallic silver의 영향 21
3. 촉매 제조 및 특성 분석 22
3.1 촉매제조 종류와 방법 22
3.1.1 함침법 22
3.1.2 이온교환법 24
3.1.3 침전법 24
3.2 촉매제조 25
3.2.1 Ag/Al2O3 26
3.2.2 Ag/Mg/Al2O3 28
3.2.3 SO4-Ag/Al2O3 28
3.3 촉매활성측정 29
3.3.1 SCR 실험용 고정층 반응기 29
3.3.2 TPD 32
3.2.3 XRD 36
3.2.4 BET 36
3.2.5 MASS 36
4. 결과 및 고찰 37
4.1 촉매제조법에 따른 촉매 활성 37
4.2 Ag 담지량에 따른 촉매 활성 41
4.3 Mg 담지량에 따른 촉매 활성 43
4.4 Ag 첨가에 따른 x%Ag/10%Mg/Al2O3 촉매 활성 46
4.5 Sulfate를 형성시킨 Ag/Al2O3 촉매활성 49
4.6 Sulfate 탈착 51
5. 결론 56
참고문헌 57

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