CAJ | 학술논문

以 FeSO4·7H2O[Fe(NO3)3·9H2O]为铁源，采用新型微波热解法制备γ-Fe2O3[α-Fe2O3]催化剂样品，通过XRD、N2等温吸附-脱附、压汞法等实验手段对催化剂样品晶相、微观孔结构等进行表征；考察两种催化剂样品的 NH3-SCR 脱硝性能，通过归一化处理得到两种催化剂在不同温度下的本征脱硝反应速率，同时对比研究了γ-Fe2O3与钒系催化剂的脱硝活性；研究氨氮比、氧浓度等运行参数对γ-Fe2O3催化剂NH3-SCR脱硝性能的影响规律，并对其抗硫抗水性能进行考察。结果表明：采用新型微波热解法可得到纯度较高的γ-Fe2O3催化剂，其介孔分布合理且大孔数量丰富；同时γ-Fe2O3催化剂表现出优于α-Fe2O3催化剂的脱硝性能，400℃时最大 NOx转化率达到96%，300、325、350℃下单位面积脱硝速率达到α-Fe2O3催化剂的3倍左右；γ-Fe2O3催化剂具备优良的抗硫抗水性能，其最佳氨氮比为1、最佳氧体积分数为3.5%。
이 FeSO4·7H2O[Fe(NO3)3·9H2O]위철원，채용신형미파열해법제비γ-Fe2O3[α-Fe2O3]최화제양품，통과XRD、N2등온흡부-탈부、압홍법등실험수단대최화제양품정상、미관공결구등진행표정；고찰량충최화제양품적 NH3-SCR 탈초성능，통과귀일화처리득도량충최화제재불동온도하적본정탈초반응속솔，동시대비연구료γ-Fe2O3여범계최화제적탈초활성；연구안담비、양농도등운행삼수대γ-Fe2O3최화제NH3-SCR탈초성능적영향규률，병대기항류항수성능진행고찰。결과표명：채용신형미파열해법가득도순도교고적γ-Fe2O3최화제，기개공분포합리차대공수량봉부；동시γ-Fe2O3최화제표현출우우α-Fe2O3최화제적탈초성능，400℃시최대 NOx전화솔체도96%，300、325、350℃하단위면적탈초속솔체도α-Fe2O3최화제적3배좌우；γ-Fe2O3최화제구비우량적항류항수성능，기최가안담비위1、최가양체적분수위3.5%。
γ-Fe2O3 andα-Fe2O3 catalysts were prepared respectivelyvia a novel microwave pyrolysis method using FeSO4·7H2O and Fe(NO3)3·9H2O as ferrous source. Crystalline phase and microstructure of catalysts were characterized by X-ray diffraction(XRD), mercury intrusion porosimetry(MIP), N2 adsorption-desorption and NH3-SCR activity of different catalysts were investigated. SCR reaction rates over the catalysts at different temperatures were obtained by unitary processing, and SCR activities overγ-Fe2O3 and vanadium-based catalysts were compared. The effects of O2 concentration, molar ratio of NH3/NO, SO2, and H2O on SCR activity ofγ-Fe2O3 catalyst were also studied. Pureγ-Fe2O3 catalyst could be obtainedvia this novel microwave pyrolysis method, and showed higher crystallinity thanα-Fe2O3 catalyst.γ-Fe2O3 catalyst had broader pore size distribution as well as appropriate ratios of mesopores and macropores. Meanwhile,γ-Fe2O3 catalyst exhibited better SCR activity thanα-Fe2O3 catalyst. The highest NOx conversion ofγ-Fe2O3 catalyst was up to 96% at 400℃ and SCR reaction rates normalized by surface area were three times higher than that ofα-Fe2O3 catalyst at 300, 325 and 350℃, respectively. The optimum molar ratio of NH3/NO and O2 concentration for selective catalytic reduction overγ-Fe2O3 catalyst were recommended to be 1 and 3.5% (vol), respectively.