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Effect of TiO2 on the Performance of Mn/Na2WO4 Catalysts in Oxidative Coupling of Methane
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-03-03 , DOI: 10.1021/acs.iecr.0c06126 Geo Jong Kim 1 , Joshua T. Ausenbaugh 1 , Hyun Tae Hwang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-03-03 , DOI: 10.1021/acs.iecr.0c06126 Geo Jong Kim 1 , Joshua T. Ausenbaugh 1 , Hyun Tae Hwang 1
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The oxidation coupling of methane (OCM) has received attention as a direct route to produce C2 chemicals. Although the OCM is energetically more efficient than the conventional process, however, it provides relatively low C2 yield and CH4 conversion at lower temperatures. In this study, TiO2 and Ce were used as a support and a promoter to facilitate CH4 conversion by providing more available oxygen species in the Mn/Na2WO4-based catalysts. Additionally, the performance of TiO2-supported catalysts was compared with that of the conventional Mn/Na2WO4/SiO2 catalyst. Various techniques including X-ray diffraction, X-ray photoelectron spectroscopy, and H2 temperature-programmed reduction were conducted to evaluate the effect of TiO2 and Ce. The 1.9 % Mn-5% Na2WO4–5% Ce/TiO2 showed the best performance, with a maximum C2 yield of 26.1% at 775 °C and the CH4/O2 ratio of 2. This yield was higher than that of the Mn/Na2WO4-based catalysts examined in this study, indicating that TiO2 is a promising support for OCM catalysts.
中文翻译：
TiO 2对甲烷氧化偶联中Mn / Na 2 WO 4催化剂性能的影响
甲烷的氧化偶联（OCM）已作为生产C 2化学品的直接途径而受到关注。尽管OCM的能量效率比常规方法高，但它在较低温度下提供了相对较低的C 2收率和CH 4转化率。在这项研究中，TiO 2和Ce用作载体和促进剂，通过在Mn / Na 2 WO 4基催化剂中提供更多可用的氧来促进CH 4转化。另外，将TiO 2负载的催化剂的性能与常规的Mn / Na 2 WO 4 / SiO 2的性能进行了比较。催化剂。进行了各种技术，包括X射线衍射，X射线光电子能谱和H 2程序升温还原，以评估TiO 2和Ce的效果。1.9％Mn-5％Na 2 WO 4 -5％Ce / TiO 2表现出最好的性能，在775°C时C 2的最大产率为26.1％，CH 4 / O 2的比率为2。高于本研究中研究的Mn / Na 2 WO 4基催化剂，表明TiO 2是OCM催化剂的有希望的载体。
更新日期：2021-03-17
中文翻译：
TiO 2对甲烷氧化偶联中Mn / Na 2 WO 4催化剂性能的影响
甲烷的氧化偶联（OCM）已作为生产C 2化学品的直接途径而受到关注。尽管OCM的能量效率比常规方法高，但它在较低温度下提供了相对较低的C 2收率和CH 4转化率。在这项研究中，TiO 2和Ce用作载体和促进剂，通过在Mn / Na 2 WO 4基催化剂中提供更多可用的氧来促进CH 4转化。另外，将TiO 2负载的催化剂的性能与常规的Mn / Na 2 WO 4 / SiO 2的性能进行了比较。催化剂。进行了各种技术，包括X射线衍射，X射线光电子能谱和H 2程序升温还原，以评估TiO 2和Ce的效果。1.9％Mn-5％Na 2 WO 4 -5％Ce / TiO 2表现出最好的性能，在775°C时C 2的最大产率为26.1％，CH 4 / O 2的比率为2。高于本研究中研究的Mn / Na 2 WO 4基催化剂，表明TiO 2是OCM催化剂的有希望的载体。
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