Tar removal is a great challenge preventing the commercialization of the biomass gasification technology for power generation. In this study, a series of Ni/MgAl₂O₄ compounds with different nickel contents were prepared by a seeded-growth strategy without surfactants, and employed as the catalysts for steam reforming of toluene which is considered as a tar model. These catalysts exhibited good catalytic activity, carbon deposition resistance and anti-sintering properties, especially 20Ni/MgAl₂O₄, which could achieve 100% gas yield with no more than 0.359% of solid carbon selectivity, and its catalytic performance did not decrease even after 600 min operation. The characterization results demonstrated that the catalyst prepared by this method showed several desirable properties, such as small Ni particle size, high dispersity of Ni on the MgAl₂O₄ support, high specific surface area, uniform mesoporous structure, and appropriate basic properties. In addition, DFT calculations indicated that there is a competitive adsorption of H₂O and C₇H₈ on Ni₅ clusters, and H₂O is easier to adsorb on the Ni₅ cluster than C₇H₈.

中文翻译：

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焦油蒸汽重整用高性能Ni / MgAl2O4催化剂的晶种制备

焦油去除是阻止生物质气化技术用于发电的商业化的巨大挑战。在这项研究中，通过不具有表面活性剂的种子生长策略制备了一系列具有不同镍含量的Ni / MgAl ₂ O ₄化合物，并将其用作甲苯蒸汽重整的催化剂，这被认为是焦油模型。这些催化剂表现出良好的催化活性，耐碳沉积性和抗烧结性能，尤其是20Ni / MgAl ₂ O _4。，在不超过0.359％的固体碳选择性的情况下，可以实现100％的气体收率，即使在600分钟的操作后，其催化性能也不会降低。表征结果表明，用该方法制备的催化剂表现出几种理想的性能，例如小Ni粒径，Ni在MgAl ₂ O ₄载体上的高分散性，高比表面积，均匀的介孔结构和适当的碱性。另外，DFT计算表明H ₂ O和C ₇ H ₈在Ni ₅团簇上具有竞争性吸附，并且H ₂ O比C ₇更易于吸附在Ni ₅团簇上。高₈。