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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Low temperature reforming of biogas over K-, Mg- and Ce-promoted Ni/Al2O3 catalysts for the production of hydrogen rich syngas: Understanding the plasma-catalytic synergy
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Low temperature reforming of biogas over K-, Mg- and Ce-promoted Ni/Al2O3 catalysts for the production of hydrogen rich syngas: Understanding the plasma-catalytic synergy

机译：在K-，Mg-和Ce-Lighted Ni / Al2O3催化剂上低温重整沼气，用于生产富含氢合成气的催化剂：了解等离子体催化协同作用

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Plasma-catalytic biogas reforming over Ni-X/Al2O3 catalyst (X = K, Mg and Ce) has been carried out in a coaxial dielectric barrier discharge (DBD) plasma reactor at 160 degrees C. Three different process modes: plasma-alone, catalysis-alone and plasma-catalysis have been investigated to get new insights into the synergistic effect resulted from the interaction of the plasma with the promoted Ni catalysts. Compared to the biogas reforming using either plasma-alone or catalysis-alone mode at the same temperature (160 degrees C), the combination of the plasma with the Ni-based catalysts exhibited a low temperature synergistic effect, as evidenced from the much higher reforming performance of the plasma-catalytic process compared to that of the sum of the individual processes (plasma-alone and catalysis-alone). The addition of promoters (K, Mg and Ce) into the Ni/Al2O3 catalyst enhanced the conversion of CH4, the yield of H-2 and the energy efficiency of the plasma process. In this study, the behaviour of K, Mg and Ce promoters in the low temperature plasma-catalytic biogas reforming was clearly different from that in high temperature thermal catalytic process in terms of the conversion of CH4 and carbon deposition, which could be ascribed to the temperature-dependent character of the promotors. In the plasma catalytic biogas reforming, the Ni-K/Al2O3 catalyst showed the best performance, enhancing the conversion of both CO2 and CH4, the yield of H-2, CO and C-2-C-4 alkanes and the energy efficiency of the plasma process. The highest conversion of CO2 (22.8%) and CH4 (31.6%) was achieved by placing the K-promoted catalyst in the plasma reforming process. The Mg-promoted catalyst remarkably increased the H-2/CO molar ratio in the gas products (up to 2.2) due to the decreased CO2 conversion. In addition, compared to the un-promoted Ni/Al2O3 catalyst, although the use of the promoted catalysts increased the carbon deposition on the surface of the spent catalysts by 22%-26%, the total amount of deposited carbon was still less than that reported in high temperature catalytic dry reforming processes. More than 80% of the increased carbonaceous species was in the form of reactive carbon species, which can be easily oxidized by CO2 and O atoms and maintain the stability of the catalysts during the reforming reaction.
机译：通过Ni-X / Al 2 O 3催化剂（x = K，Mg和Ce）在160℃的同轴介电阻挡排放（DBD）等离子体反应器中进行等离子体催化沼气（X = K，Mg和Ce）。单独的等离子体，已经研究了单独的单独和等离子体催化，以获得新的洞察于血浆与促进的Ni催化剂的相互作用导致的协同效果。与在相同温度（160℃）处的血浆或单独的单独模式使用血浆或单独的催化模式相比，血浆与Ni基催化剂的组合表现出低温协同效应，如高于更高的重整所证明与个体方法的总和（单独血浆和催化 - 单独）的总和相比，等离子体催化过程的性能。将促进剂（K，Mg和Ce）加入Ni / Al 2 O 3催化剂的增强CH 4的转化，H-2的产率和等离子体过程的能量效率。在该研究中，在低温血浆催化沼气中的K，Mg和Ce启动子的行为明显不同于CH4和碳沉积的转化率的高温热催化过程中，这可以归因于促进剂的温度依赖性特征。在血浆催化沼气重整中，Ni-K / Al2O3催化剂显示出最佳性能，增强CO 2和CH 4的转化，H-2，CO和C-2-C-4烷烃的产率和能量效率等离子体过程。通过将K型促进催化剂放置在血浆重整过程中，实现了CO 2（22.8％）和CH 4（31.6％）的最高转化。由于CO 2转化率降低，Mg促进催化剂显着增加了气体产品中的H-2 / CO摩尔比（最多2.2）。另外，与未促进的Ni / Al 2 O 3催化剂相比，尽管使用促进的催化剂的使用将碳沉积增加22％-26％，但沉积的碳的总量仍然小于该碳含量在高温催化干重整过程中报道。增加的碳质物质中的80％以上是反应性碳物质的形式，可通过CO 2和O原子容易地氧化，并在重整反应过程中保持催化剂的稳定性。

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