甲烷氧化偶联-不同二氧化硅负载的 MnTiO-NaWO 和 MnO-TiO-NaWO 催化剂的比较。
Oxidative coupling of methane-comparisons of MnTiO-NaWO and MnO-TiO-NaWO catalysts on different silica supports.
机构信息
Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand.
Center of Excellence on Petrochemical and Materials Technology, Kasetsart University, Bangkok, 10900, Thailand.
出版信息
Sci Rep. 2022 Feb 16;12(1):2595. doi: 10.1038/s41598-022-06598-6.
The oxidative coupling of methane (OCM) converts CH to value-added chemicals (C), such as olefins and paraffin. For a series of MnTiO-NaWO (MnTiO-NW) and MnO-TiO-NaWO (Mn-Ti-NW), the effect of loading of MnTiO or MnO-TiO, respectively, on two different supports (sol-gel SiO (SG) and commercial fumed SiO (CS)) was examined. The catalyst with the highest C yield (21.6% with 60.8% C selectivity and 35.6% CH conversion) was 10 wt% MnTiO-NW/SG with an olefins/paraffin ratio of 2.2. The catalyst surfaces with low oxygen-binding energies were associated with high CH conversion. Stability tests conducted for over 24 h revealed that SG-supported catalysts were more durable than those on CS because the active phase (especially NaWO) was more stable in SG than in CS. With the use of SG, the activity of MnTiO-NW was not substantially different from that of Mn-Ti-NW, especially at high metal loading.
甲烷氧化偶联（OCM）将 CH 转化为有价值的化学品（C），例如烯烃和石蜡。对于一系列 MnTiO-NaWO（MnTiO-NW）和 MnO-TiO-NaWO（Mn-Ti-NW），分别考察了负载 MnTiO 或 MnO-TiO 对两种不同载体（溶胶-凝胶 SiO（SG）和商业气相 SiO（CS））的影响。具有最高 C 产率（21.6%，C 选择性为 60.8%，CH 转化率为 35.6%）的催化剂是 10wt% MnTiO-NW/SG，其烯烃/石蜡比为 2.2。具有低氧结合能的催化剂表面与高 CH 转化率相关。进行了超过 24 小时的稳定性测试，结果表明 SG 负载的催化剂比 CS 负载的催化剂更耐用，因为活性相（特别是 NaWO）在 SG 中比在 CS 中更稳定。使用 SG 时，MnTiO-NW 的活性与 Mn-Ti-NW 没有显著差异，尤其是在高金属负载下。
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