纳米铁基催化剂在CO2加氢制烃中的性能
使用尿素沉淀凝胶、机械混合和等体积浸渍相结合的方法, 制备了一系列的纳米尺寸FeK-M/γ-Al2O3（M=Cd, Cu）催化剂, 采用扫描电镜（SEM）、透射电镜（TEM）、N2物理吸附、X射线衍射（XRD）光谱和H2程序升温还原（H2-TPR）仪对催化剂进行表征, 并在小型固定床反应器上考察其对CO2加氢反应的催化性能. 结果表明：3 MPa, 400 °C, 3600 h-1, H2/CO2摩尔比为3 的条件下, 15%（w, 下同）Fe10%K/γ-Al2O3催化剂可稳定运行100h 以上, CO2转化率为51.3%, C2＋烃类的选择性达62.6%. Fe 含量降至2.5%时, C2...
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| Published in | 物理化学学报 Vol. 28; no. 8; pp. 1943 - 1950 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
大连理工大学化工学院工业催化系,精细化工国家重点实验室,辽宁大连116024%大连理工大学化工学院工业催化系,精细化工国家重点实验室,辽宁大连116024
2012
宾夕法尼亚州立大学能源研究所,能源与矿物工程系,宾夕法尼亚州大学城,16802,美国 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1000-6818 |
| DOI | 10.3866/PKU.WHXB201206051 |
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| Summary: | 使用尿素沉淀凝胶、机械混合和等体积浸渍相结合的方法, 制备了一系列的纳米尺寸FeK-M/γ-Al2O3（M=Cd, Cu）催化剂, 采用扫描电镜（SEM）、透射电镜（TEM）、N2物理吸附、X射线衍射（XRD）光谱和H2程序升温还原（H2-TPR）仪对催化剂进行表征, 并在小型固定床反应器上考察其对CO2加氢反应的催化性能. 结果表明：3 MPa, 400 °C, 3600 h-1, H2/CO2摩尔比为3 的条件下, 15%（w, 下同）Fe10%K/γ-Al2O3催化剂可稳定运行100h 以上, CO2转化率为51.3%, C2＋烃类的选择性达62.6%. Fe 含量降至2.5%时, C2＋烃类的选择性仍能达到60.0%. 随着K含量由0%增加至10%, 低碳烯烃选择性增加, 烯烷比增加至3.6. Cd和Cu助剂可促进Fe 物种的还原, 改善目的产物的分布, 其中Cu的加入使低碳产物烯烷比增至5.4, Cd的加入使C5＋产物选择性增加了12%. |
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| Bibliography: | 11-1892/06 Carbon dioxide; Hydrogenation; Fe-based catalyst; Precipitation; Light hydrocarbon Combining co-precipitation-gelation, mechanical mixing and impregnation methods, a series of catalysts of FeK-M/γ-Al2O3（M=Cd or Cu） have been attained. The catalysts were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, N2 physisorption, X-ray diffraction （XRD） and temperature-programmed reduction of hydrogen （H2-TPR）. The hydrogenation of carbon dioxide over these catalysts was also investigated in a fixed bed. Given a reaction time of 100 h, CO2 conversion over a 15%Fe/10%K/γ-Al2O3 catalyst reached 51.3 %, with a selectivity towards C2＋ of 62.6 % at 3 MPa, 673 K, a space velocity of 3600 h-1 and at a molar ratio of H2/CO2 of 3. At the lower Fe content of 2.5%, the selectivity towards C2＋ was still greater than 60.0%. Increasing the potassium content from 0% to 10%, increased the selectivity towards C2-C4= and the molar ratio of C2-C4= /C2-C40 increased to 3.6. The addition |
| ISSN: | 1000-6818 |
| DOI: | 10.3866/PKU.WHXB201206051 |