分子催化
分子催化
분자최화
JOURNAL OF MOLECULAR CATALYSIS(CHINA)
2001年
1期
1-5
,共5页
尉继英%马军%朱月香%蔡小海%谢有畅
尉繼英%馬軍%硃月香%蔡小海%謝有暢
위계영%마군%주월향%채소해%사유창
一氧化氮%选择催化还原%氧化锡%氧化铝
一氧化氮%選擇催化還原%氧化錫%氧化鋁
일양화담%선택최화환원%양화석%양화려
采用双股并流共沉淀方法制备的锡铝复合氧化物, 对有氧条件下C3H6选择还原NO反应有较高的催化活性和较宽的反应温度区间. 具有最佳配比(Sn∶Al(摩尔比)=1∶1.94)的锡铝复合氧化物样品,在反应温度350 ℃时可使NO转化率达71%. XRD、 H2-TPR及NH3-TPD的研究结果表明, 锡与铝难以形成氧化物固溶体, 而SnO2是以微晶形态分散于无定形的Al2O3上. Al2O3的中等强度酸性与SnO2微晶适度的氧化还原性能相结合, 使锡铝复合氧化物具有较高的催化活性.
採用雙股併流共沉澱方法製備的錫鋁複閤氧化物, 對有氧條件下C3H6選擇還原NO反應有較高的催化活性和較寬的反應溫度區間. 具有最佳配比(Sn∶Al(摩爾比)=1∶1.94)的錫鋁複閤氧化物樣品,在反應溫度350 ℃時可使NO轉化率達71%. XRD、 H2-TPR及NH3-TPD的研究結果錶明, 錫與鋁難以形成氧化物固溶體, 而SnO2是以微晶形態分散于無定形的Al2O3上. Al2O3的中等彊度痠性與SnO2微晶適度的氧化還原性能相結閤, 使錫鋁複閤氧化物具有較高的催化活性.
채용쌍고병류공침정방법제비적석려복합양화물, 대유양조건하C3H6선택환원NO반응유교고적최화활성화교관적반응온도구간. 구유최가배비(Sn∶Al(마이비)=1∶1.94)적석려복합양화물양품,재반응온도350 ℃시가사NO전화솔체71%. XRD、 H2-TPR급NH3-TPD적연구결과표명, 석여려난이형성양화물고용체, 이SnO2시이미정형태분산우무정형적Al2O3상. Al2O3적중등강도산성여SnO2미정괄도적양화환원성능상결합, 사석려복합양화물구유교고적최화활성.
SnO2-Al2O3 binary metal oxide prepared by co-current co-precipitation (CCP) method shows good performance for the selective reduction of NO by C3H6 in a broad temperature window. For the sample with Sn∶Al (mol/mol)=1∶1.97 at 350 ℃, 71% conversion of 1.186×10-3 NO to N2 was attained in the presence of 9.48×10-4 C3H6 and 2.23% O2 in He, at a space velocity of 15 000 h-1. Using XRD, H2-TPR and NH3-TPD analysis, we found that the SnO2/Al2O3 binary oxide seems to be SnO2 micro-crystal dispersed on the amorphous γ-Al2O3, and the synergic effect of acidity of Al2O3 and oxidizability of SnO2 led to the improvement of the catalyst activity.