A novel [email protected]₂ core-shell catalyst with single NiCo alloy nanoparticle encapsulated by SiO₂ shell was synthesized by microemulsion method. During dry reforming of CH₄ with CO₂ (DRM) reaction, this catalyst exhibited high activity and selectivity, superior over either the [email protected]₂ or the [email protected]₂ core-shell catalyst or the NiCo/SiO₂ supported catalyst. The CO₂ and CH₄ (1:1) could be absolutely converted into CO and H₂ with molar ratio around 1:1. More importantly, this catalyst displayed very long lifetime (> 1000 h) in the DRM reaction at 800 °C, much better than either the [email protected]₂ or the [email protected]₂ core-shell catalyst or the NiCo/SiO₂ supported catalyst. Kinetic studies revealed that the catalyst with small metal nanoparticle size exhibited higher activity, which could also inhibit carbon deposition. The encapsulation of metal nanoparticles by SiO₂ shell could effectively inhibit the agglomeration of active sites. Meanwhile, the enhanced activity of NiCo alloy catalyst could also diminish the surface carbon deposition. Therefore, the [email protected]₂ core-shell catalyst displayed excellent stability in DRM reaction, showing good potential in industrial application.

通过微乳液法合成了一种新型的[电子邮件保护] ₂核壳催化剂，该催化剂具有被SiO ₂壳包裹的单个NiCo合金纳米颗粒。在用CO ₂（DRM）反应进行CH _4的干重整过程中，该催化剂表现出高活性和选择性，优于[电子邮件保护的] ₂或[电子邮件保护的] ₂核-壳催化剂或NiCo / SiO ₂负载的催化剂。CO ₂和CH ₄（1：1）可以绝对转化为CO和H ₂摩尔比约为1：1。更重要的是，该催化剂在800°C的DRM反应中显示出非常长的寿命（> 1000小时），远优于[电子邮件保护] ₂或[电子邮件保护] ₂核壳催化剂或NiCo / SiO ₂负载型催化剂。动力学研究表明，具有较小金属纳米颗粒尺寸的催化剂表现出较高的活性，这也可能抑制碳沉积。SiO ₂壳包裹金属纳米颗粒可以有效抑制活性位的团聚。同时，NiCo合金催化剂活性的增强也可以减少表面碳的沉积。因此，[电子邮件保护] ₂ 核壳催化剂在DRM反应中表现出优异的稳定性，在工业应用中显示出良好的潜力。