The use of Cu-based catalysts in CO₂ hydrogenation to methanol (MeOH) has attracted considerable attention due to their low reaction temperature, low cost, and high activity. However, Cu nanoparticles are usually sintered under high-H₂ atmosphere. The difficulty in keeping the Cu⁺/Cu⁰ ratio stable during the reaction leads to the instability of Cu-based catalysts. In this work, La oxide-doped Cu nanoparticles socketed into parent Cu phyllosilicate nanotubes (La/CuSi-NT) are synthesized by exsolution in situ under a reducing atmosphere at elevated temperatures. They are used to catalyze CO₂ hydrogenation to MeOH. Catalytic results show that the La/CuSi-NT catalyst is more stable than intact CuSi-NT and Cu-based catalysts prepared via traditional methods. Among the prepared catalysts, the 0.2La/CuSi-NT catalyst with the La/Cu molar ratio of 0.2 exhibits the highest MeOH yield of up to 428 mg g_cat⁻¹ h⁻¹ and performance that remains stable for at least 200 h. Characteristic studies indicate that introducing a La promoter helps increase Cu⁺/Cu⁰ ratios and confirm that LaO_x species favor generating the formate species of CO₂ hydrogenation. Therefore, MeOH synthesis through CO₂ hydrogenation is intensified over the La/CuSi-NT catalyst.

Cu基催化剂在CO ₂加氢制甲醇(MeOH)中的应用由于其反应温度低、成本低和活性高而受到广泛关注。然而，Cu纳米颗粒通常在高H ₂气氛下烧结。在反应过程中保持Cu ⁺ /Cu ⁰比稳定的困难导致Cu基催化剂的不稳定性。在这项工作中，通过在还原气氛下在升高的温度下原位外溶合成了嵌入母体铜页硅酸盐纳米管 (La/CuSi-NT) 中的 La 氧化物掺杂的 Cu 纳米粒子。它们用于催化 CO ₂加氢为甲醇。催化结果表明，La/CuSi-NT催化剂比通过传统方法制备的完整CuSi-NT和Cu基催化剂更稳定。在制备的催化剂中，La/Cu 摩尔比为 0.2 的 0.2La/CuSi-NT 催化剂表现出最高的 MeOH 产率，高达 428 mg g _cat ^-1 h ^-1并且性能保持稳定至少 200 h。特征研究表明，引入 La 促进剂有助于提高 Cu ⁺ /Cu ⁰比率，并证实 LaO _x物质有利于生成 CO ₂氢化的甲酸盐物质。因此，在 La/CuSi-NT 催化剂上，通过 CO ₂氢化反应的甲醇合成得到加强。