A high-performance Ni-foam-structured FeNi₃-FeO_x nanocomposite catalyst is developed for the ethanol (EtOH) synthesis from syngas via gas-phase dimethyl oxalate (DMO) hydrogenation. The hydrothermally-synthesized Ni(OH)₂/Ni-foam was impregnated with aqueous solution of iron(III) nitrate, from which the preferred FeNi₃-FeO_x/Ni-foam-(550/350) catalyst was obtainable by calcining preferably at 550 °C (to adequately form NiFe₂O₄-NiO composites) and subsequently reducing in H₂. Such catalyst is capable of fully converting DMO with 98% ethanol selectivity at 230 °C and 2.5 MPa using a WHSV_DMO of 0.44 h^-1 and a H₂/DMO molar ratio of 90, and particularly, being stable for at least 700 h. A high turnover frequency of 88.8 h^-1 is achieved at 180 °C. Exactly, our NiFe₂O₄-NiO derivation strategy endows the catalyst with plentiful interface between FeNi₃ nanoalloy (∼16 nm) and FeO_x fragments (acting as acid sites), achieving synergistic catalysis to ester groups in DMO and as-formed hydroxyl groups, thereby markedly improving its hydrogenation to EtOH.

开发了一种高性能的Ni-泡沫结构的FeNi ₃ -FeO _x纳米复合催化剂，用于合成气经草酸二甲酯（DMO）加氢合成乙醇（EtOH）。用硝酸铁（III）的水溶液浸渍水热合成的Ni（OH）₂ / Ni-泡沫，从中优选煅烧得到优选的FeNi ₃ -FeO _x / Ni-泡沫-（550/350）催化剂。在550°C下（充分形成NiFe ₂ O ₄ -NiO复合材料），然后还原H ₂。这种催化剂能够使用0.44 h的WHSV _DMO在230°C和2.5 MPa下以98％的乙醇选择性完全转化DMO^-1且H ₂ / DMO摩尔比为90，特别是至少700 h稳定。在180°C时达到88.8 h ^-1的高周转频率。恰恰是，我们的NiFe ₂ O ₄ -NiO衍生策略赋予了催化剂在FeNi ₃纳米合金（〜16 nm）和FeO _x片段（充当酸位）之间具有丰富的界面，实现了对DMO中酯基和形成的羟基的协同催化作用基团，从而显着改善其氢化成EtOH。