This article describes the design and synthesis of MgO‐modified Ni/CaO catalysts for sorption‐enhanced steam reforming of ethanol. The results show that the introduction of MgO effectively increases the dispersion of CaO via forming MgCa(CO₃)₂ precursor. In the prepared MgO‐modified Ni/CaO catalysts, metallic Ni exists around MgO supported on CaO. Both 100% ethanol conversion and >96% hydrogen purity can be stabilized in 10 cycles over the catalyst containing 20 wt% MgO. The interaction between metallic Ni and MgO enhances the sintering resistance of the catalyst. More importantly, reaction pathway studies have confirmed that the formation of CaCO₃ hinders the activation of H₂O on the Ni/CaO catalyst surface, and thus inhibits the conversion of the reaction intermediates including HCO* and CH _x*. MgO can dissociate H₂O to form hydroxyl groups which participate in the conversion of the reaction intermediates, thereby the MgO‐modified Ni/CaO catalysts have better catalytic performance and carbon deposition resistance.

中文翻译：

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MgO在Ni / CaO催化剂上对乙醇的吸附增强蒸汽重整的促进作用

本文介绍了用于乙醇吸附增强蒸汽重整的MgO改性Ni / CaO催化剂的设计和合成。结果表明，MgO的引入通过形成MgCa（CO ₃）₂前体有效地提高了CaO的分散性。在制备的MgO改性的Ni / CaO催化剂中，金属Ni存在于负载在CaO上的MgO周围。在含有20 wt％MgO的催化剂上，可以在10个循环中稳定100％的乙醇转化率和> 96％的氢气纯度。金属Ni和MgO之间的相互作用增强了催化剂的抗烧结性。更重要的是，反应途径研究已证实CaCO ₃的形成会阻碍H ₂的活化O在Ni / CaO催化剂表面上，因此抑制了包括HCO *和CH _x *在内的反应中间体的转化。MgO可以分解H ₂ O形成羟基，这些羟基参与反应中间体的转化，因此MgO改性的Ni / CaO催化剂具有更好的催化性能和抗碳沉积性。