CAJ | 학술논문

为研究具有良好活性的低温选择性催化还原催化剂，针对目前 Mn 基材料低温选择性催化还原脱硝催化剂研究的局限性，以超氧自由基促进光催化为理论基础，N掺杂改性非金属为研究思路，采用溶胶凝胶法及过量浸渍法制备了N掺杂MnOx/TiO2催化剂，用于锅炉烟气脱硝。提出了氧浓度、[NH3]/[NO]以及空速对脱硝效率的影响，结合 X 射线衍射表征，获得了 N 掺杂催化剂的反应工艺参数和相应的晶型变化特性。研究结果表明，N掺杂后，催化剂脱硝活性明显，并对催化剂N掺杂量、Mn负载量及催化剂煅烧温度进行了优化，并对优化结果进行分析。在此基础上，考察了含氧量，得出在 O2浓度5%、[NH3]/[NO]为1.2时，空速28000 h-1，反应温度180℃的条件下，掺N量为1%以及Mn负载量为5%的N掺杂MnOx/TiO2催化剂的脱硝活性稳定在90%左右。
위연구구유량호활성적저온선택성최화환원최화제，침대목전 Mn 기재료저온선택성최화환원탈초최화제연구적국한성，이초양자유기촉진광최화위이론기출，N참잡개성비금속위연구사로，채용용효응효법급과량침지법제비료N참잡MnOx/TiO2최화제，용우과로연기탈초。제출료양농도、[NH3]/[NO]이급공속대탈초효솔적영향，결합 X 사선연사표정，획득료 N 참잡최화제적반응공예삼수화상응적정형변화특성。연구결과표명，N참잡후，최화제탈초활성명현，병대최화제N참잡량、Mn부재량급최화제단소온도진행료우화，병대우화결과진행분석。재차기출상，고찰료함양량，득출재 O2농도5%、[NH3]/[NO]위1.2시，공속28000 h-1，반응온도180℃적조건하，참N량위1%이급Mn부재량위5%적N참잡MnOx/TiO2최화제적탈초활성은정재90%좌우。
In view of the limitations of low-temperature catalysts about MnOx/TiO2, based on the theory of superoxide free radical in the field of photocatalysis, this study proposed a new way for N-doped catalyst by nonmetal materials. N-doped MnOx/TiO2 catalyst with good activity under low temperature was prepared by sol-gel method for titania support, followed by impregnation for MnOx loading. N doping, Mn loading and calcination temperature of the N-doped catalyst were optimized and the results were analyzed by XRD. Based on these results, the effects of O2 concentration, [NH3]/[NO] and GHSV were investigated. The experimental results show that when the reacting mixture contains 5%O2, [NH3]/[NO]=1.2 and GHSV=28 000 h-1, the NO conversion of the N-doped MnOx/TiO2 catalyst with 1% N doping and 5% Mn loading is about 90%over 180℃.