CAJ | 학술논문

利用溶胶-凝胶技术原位合成一系列不同V2O5担载量的V2O5/TiO2催化剂，通过BET、XRD、NH3-TPD及紫外-可见光等手段对催化剂进行表征。结果表明：制备的催化剂均具有介孔结构，V2O5在TiO2表面高度分散，且存在3种典型的酸性位。通过选择性催化还原反应对V2O5/TiO2催化剂进行活性评价，结果显示随着V2O5含量的增加，NO转化率大于75%的温度窗口向低温方向偏移，含10%(质量分数)V2O5的催化剂的NO转化率为80%的温度窗口最宽为200～450℃，240℃时20 h连续实验表现出稳定的抗硫抗水性能。结合紫外-可见光谱分析，揭示了钒掺杂所形成的单聚和低聚钒酸盐为催化剂的活性组分。
이용용효-응효기술원위합성일계렬불동V2O5담재량적V2O5/TiO2최화제，통과BET、XRD、NH3-TPD급자외-가견광등수단대최화제진행표정。결과표명：제비적최화제균구유개공결구，V2O5재TiO2표면고도분산，차존재3충전형적산성위。통과선택성최화환원반응대V2O5/TiO2최화제진행활성평개，결과현시수착V2O5함량적증가，NO전화솔대우75%적온도창구향저온방향편이，함10%(질량분수)V2O5적최화제적NO전화솔위80%적온도창구최관위200～450℃，240℃시20 h련속실험표현출은정적항류항수성능。결합자외-가견광보분석，게시료범참잡소형성적단취화저취범산염위최화제적활성조분。
A series of V2O5/TiO2 catalysts with different amounts of V2O5 were prepared with the in-situ sol-gel method. Characterization of the catalysts were performed with N2 adsorption and desorption, X-ray diffraction (XRD), UV-Vis spectroscopy (UV-Vis) and temperature programmed desorption of NH3(NH3-TPD). All catalysts exhibited mesoporous structure, high dispersion of V2O5 on the surface of TiO2 and three typical acid sites. Evaluation of the catalytic performance for NH3-denitration revealed good activity for low-temperature denitration of the catalyst, which increased with increasing amount of V2O5. The V2O5/TiO2 catalyst with 10%(mass) V2O5 showed the widest temperature window of 200-450℃ for NO conversions of about 80%at a NH3/NO ratio of 0.8. The catalytic performance for denitration did not obviously decrease in a 20 h continuous denitration test at 240℃ for the simulated flue gas containing 0.06%(vol) SO2 and 10%(vol) H2O. The UV-Vis analysis clarified that for NH3-denitration the unimer and low-poly vanadates are the active components of the prepared V2O5/TiO2 catalysts.