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Oxidative coupling of methane over Mn-Na2WO4 catalyst supported by monolithic SiO2
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-20 , DOI: 10.1016/j.apcata.2017.08.020
Cagla Uzunoglu , Aybuke Leba , Ramazan Yildirim

In this work, oxidative coupling of methane was studied over monolithic Mn/Na2WO4/SiO2 catalysts. The monolithic catalysts were prepared by three different ways as (1) preparation of monolithic silica (monosil) followed by impregnation of Mn and Na2WO4, (2) preparation of monolithic silica with Mn addition during gelation (Mn-monosil) followed by impregnation of Na2WO4 and (3) preparation of monolithic silica as MCM-41 structure (MCM-monosil) followed by impregnation of Mn and Na2WO4. The catalysts were tested in a microflow reactor and the results were compared with those obtained over particulate catalysts. It was found that Mn-monosil performed best and produced C2 yield of 16.2%, which is close to the values obtained over particulate catalyst (19.3%). Mn-monosil was also passed the 10 h stability and hysteresis tests successfully. SEM characterization revealed that monolithic catalysts prepared by three different methods had different pore structure; it was also seen from SEM images that Mn-monosil preserved its original form better, and this was also verified by XRD analysis.



中文翻译:

整体式SiO 2负载的Mn-Na 2 WO 4催化剂上甲烷的氧化偶联

在这项工作中,在整体式Mn / Na 2 WO 4 / SiO 2催化剂上研究了甲烷的氧化偶联。整体催化剂通过三种不同的方式制备:(1)整体二氧化硅(monosil)的制备,然后浸渍Mn和Na 2 WO 4,(2)凝胶化过程中添加Mn的整体二氧化硅(Mn-monosil)的制备,浸渍Na 2 WO 4和(3)制备MCM-41结构的整体式二氧化硅(MCM-monosil),然后浸渍Mn和Na 2 WO 4。在微流反应器中测试催化剂,并将结果与​​通过颗粒催化剂获得的结果进行比较。发现Mn-单硅树脂表现最佳,并且产生的C 2产率为16.2%,这接近于通过颗粒催化剂获得的值(19.3%)。Mn-monosil也成功通过了10小时的稳定性和磁滞测试。SEM表征表明,用三种不同方法制备的整体催化剂具有不同的孔结构。从SEM图像还可以看出,Mn-monosil可以更好地保留其原始形态,这也通过XRD分析得到了证实。

更新日期:2017-08-20
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