Rong Qingshan, Ding Wei, Liu Guogang, Fu Xiangyu, Shi Yan, Zhang Zhiqiang, Yao Zhiwei
School of Chemical Engineering, University of Science and Technology Liaoning Anshan 114051 P.R. China
School of Petrochemical Engineering, Liaoning Petrochemical University Fushun 113001 P.R. China.
RSC Adv. 2025 Mar 18;15(11):8346-8353. doi: 10.1039/d4ra08875a. eCollection 2025 Mar 17.
In this study, we found that β-MoC prepared at different carbonization temperatures exhibited significantly different catalytic activities for the reverse water gas shift (RWGS) reaction. The β-MoC synthesized at 600 °C demonstrated notably higher activity compared to those prepared at 700 °C and 800 °C. This enhanced activity was likely attributed to its improved redox properties, which were primarily driven by a smaller crystallite size and the presence of Mo OC species. Therefore, we proposed that the crystallite size and Mo OC content were the key factors governing the RWGS activity of β-MoC. Clearly, both factors were strongly influenced by the carbonization temperature. Notably, the β-MoC prepared at 600 °C even outperformed Cu-doped β-MoC prepared at 700 °C under similar reaction conditions.
在本研究中，我们发现不同碳化温度制备的β-MoC对逆水煤气变换（RWGS）反应表现出显著不同的催化活性。600℃合成的β-MoC比700℃和800℃制备的β-MoC具有更高的活性。这种活性增强可能归因于其氧化还原性能的改善，这主要由较小的微晶尺寸和Mo OC物种的存在驱动。因此，我们提出微晶尺寸和Mo OC含量是控制β-MoC的RWGS活性的关键因素。显然，这两个因素都受到碳化温度的强烈影响。值得注意的是，在类似反应条件下，600℃制备的β-MoC甚至优于700℃制备的Cu掺杂β-MoC。
