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首页> 外文期刊>Catalysts >Steam Reforming of Bio-Ethanol to Produce Hydrogen over Co/CeO 2 Catalysts Derived from Ce 1? x Co x O 2? y Precursors
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Steam Reforming of Bio-Ethanol to Produce Hydrogen over Co/CeO 2 Catalysts Derived from Ce 1? x Co x O 2? y Precursors

机译：Ce 1衍生的Co / CeO 2催化剂对生物乙醇进行蒸汽重整以生产氢气？ x Co x O 2？ y前体

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A series of Ce 1? x Co x O 2? y precursors were prepared by homogeneous precipitation using urea as a precipitant. The Co/CeO 2 catalysts obtained from the Ce 1? x Co x O 2? y precursors were used for the steam reforming of ethanol to produce hydrogen. Co ions could enter the CeO 2 lattices to form Ce 1? x Co x O 2? y mixed oxides at x ≤ 0.2 using the homogeneous precipitation (hp) method. CeO 2 was an excellent support for Co metal in the steam reforming of ethanol because a strong interaction between support and metal (SISM) exists in the Co/CeO 2 catalysts. Because Co/CeO 2 (hp) prepared by homogeneous precipitation possessed a high BET surface area and small Co metal particles, Co/CeO 2 (hp) showed a higher ethanol conversion than the Co/CeO 2 catalysts prepared using the co-precipitation (cp) method and the impregnation (im) method. The selectivity of CO 2 over Co/CeO 2 (hp) increased with increasing reaction temperature at from 573 to 673 K, and decreased with increasing reaction temperature above 673 K due to the increase of CO formation. The carbonaceous deposits formed on the catalyst surface during the reaction caused a slow deactivation in the steam reforming of ethanol over Co/CeO 2 (hp). The catalytic activity of the used catalysts could be regenerated by an oxidation-reduction treatment, calcined in air at 723 K and then reduced by H 2 at 673 K.
机译：一系列的Ce 1？ x Co x O 2？通过使用尿素作为沉淀剂进行均匀沉淀来制备前体。由Ce 1？3得到的Co / CeO 2催化剂。 x Co x O 2？ y前体用于乙醇的蒸汽重整以生产氢气。钴离子可以进入CeO 2晶格形成Ce 1？ x Co x O 2？使用均质沉淀（hp）方法在x≤0.2处混合y种氧化物。 CeO 2是乙醇蒸汽重整中Co金属的极佳载体，因为Co / CeO 2催化剂中存在载体与金属之间的强相互作用（SISM）。由于通过均相沉淀制备的Co / CeO 2（hp）具有较高的BET表面积和小的Co金属颗粒，因此与使用共沉淀制备的Co / CeO 2催化剂相比，Co / CeO 2（hp）显示出更高的乙醇转化率（ cp）方法和浸渍（im）方法。 CO 2相对于Co / CeO 2（hp）的选择性随反应温度从573 K升高至673 K而增加，而随着反应温度高于673 K而升高，这是由于CO形成的增加而降低的。反应期间在催化剂表面形成的碳质沉积物导致乙醇在Co / CeO 2（hp）上进行水蒸气重整时缓慢失活。用过的催化剂的催化活性可以通过氧化还原处理再生，在723 K的空气中煅烧，然后在673 K的温度下被H 2还原。

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