Synthesis of Na2WO4-MnxOy supported on SiO2 or La2O3 as fiber catalysts by electrospinning for oxidative coupling of methane

Arabian Journal of Chemistry

Metta Chareonpanich¹  Anusorn Seubsai¹  Thanaphat Chukeaw¹  Thongthai Witoon¹  Chularat Wattanakit²  Kajornsak Faungnawakij²  Worapinit Tiyatha²  Sarannuch Sringam²  Kanticha Jaroenpanon² 

[1] Center of Excellence on Petrochemical and Materials Technology, Kasetsart University, Bangkok 10900, Thailand;Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand;

关键词: Fiber catalyst;    La2O3;    Na2WO4;    Oxidative coupling of methane;    SiO2;   

DOI  :  

来源: DOAJ

【 摘 要 】

The oxidative coupling of methane (OCM) is an attractive route to convert natural gas directly into value-added chemical products (C2+). This work comparatively investigated SiO2- or La2O3-supported Na2WO4-MnxOy (denoted as NWM) catalysts in powder and fiber forms. The powder catalysts were prepared using a co-impregnation method and the fiber catalysts were prepared successfully using an electrospinning technique. The NWM/La2O3 fiber catalysts were activated at low temperature (500 °C) and had a 4.7% C2+ yield, with the maximum C2+ yield of 9.6% at 650 °C, while the NWM/SiO2 fiber catalyst was activated at 650 °C and had a maximum C2+ yield of 20.4% at 700 °C. The XPS results in the O 1s region indicated that NWM/La2O3 had a lower binding energy than NWM/SiO2, suggesting that the lattice oxygen species is easily released from the catalyst surface and creates vacancy sites that enhance performance. The stability test of the catalysts indicated that the La2O3-containing catalysts had excellent activity and high thermal stability, while the SiO2-containing catalysts had a higher C2+ yield when the prepared catalysts were compared at 700 °C. Considering the same component catalysts, the fiber catalysts achieved higher performance because their heat and mass transfer properties were enhanced.

【 授权许可】

Unknown