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对于CO2加氢制甲烷的Ni基催化剂，氧空位和金属镍的高分散是关键因素。由5种或5种以上金属阳离子构成的高熵氧化物(HEOs)易于形成表面氧空位而且利于所包含离子的高分散。采用柠檬酸络合法制备了(CeZrYLaTi)O2萤石型HEOs担载镍的催化剂，将其用于CO2加氢制甲烷，并系统表征了催化剂。研究结果显示担载于HEOs以及Ce、Zr、Y、La和Ti 5种金属离子构成的混合氧化物上的金属镍分散度高、抗烧结与抗积碳性能好、表面易于形成氧空位，呈现出优良的CO2加氢制甲烷性能。相比于HEOs,由5种金属离子构成的混合氧化物担载镍催化剂具有更高的活性和稳定性，由于其煅烧温度较低，比表面积更高，更利于活化CO2。
Abstract：The oxygen vacancy and high dispersion of nickel metal are the key factors for the Ni-based catalyst for hydrogenation of methane from CO2. High entropy oxides(HEOs) composed of five or more metal cations are prone to the formation of surface oxygen vacancies and facilitate the high dispersion of the contained ions. In this paper,(CeZrYLaTi)O2 fluorite HEOs catalyst supported by nickel was prepared by citric acid complexation method. The catalyst was used for hydrogenation of CO2 to methane. The results show that nickel on HEOs and the mixed oxides composed of Ce, Zr, Y, La and Ti has high dispersion, good anti-sintering and anti-carbon properties, and easy to form oxygen vacancy on the surface, showing excellent hydrogenation performance of CO2 to methane. Compared with HEOs, the mixed oxide-supported nickel catalyst composed of five metal ions(Ce, Zr, Y, La and Ti) has higher activity and stability, because of its lower calcination temperature, higher specific surface area, and more conducive to CO2 activation.
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基本信息:
DOI：10.13353/j.issn.1004.9533.20250315
中图分类号:TQ426;TQ221.11
引用信息:
[1]肖飞,姜雅楠,邢睿,等.CO_2加氢制甲烷的高熵氧化物负载Ni催化剂[J].化学工业与工程,2026,43(02):19-28.DOI:10.13353/j.issn.1004.9533.20250315.
基金信息:
鄂尔多斯市重点研发计划(YF20232313)