首页> 外文期刊>RSC Advances >Influence of method of preparation on the activity of La-Ni-Ce mixed oxide catalysts for dry reforming of methane
【24h】

Influence of method of preparation on the activity of La-Ni-Ce mixed oxide catalysts for dry reforming of methane

机译:制备方法对La-Ni-Ce混合氧化物催化剂甲烷干重整活性的影响

获取原文
获取原文并翻译 | 示例
           

摘要

La-Ni-x-Ce1-x mixed oxide catalysts were prepared by a sol-gel method varying the Ni composition (0 <= x <= 1). The catalysts were characterized by X-ray diffraction (XRD), inductively coupled plasma optical emission spectroscopy (ICP-OES), BET surface area, X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), H-2 chemisorption and Fourier transform infrared spectroscopy (FT-IR) techniques. CO2 reforming of methane was carried out at atmospheric pressure and 800 degrees C, maintaining a reactant CO2/CH4/N-2 ratio of 80/80/80 (total flow rate = 240 ml min(-1), GHSV of 28 800 h(-1)). The catalysts offered higher activity even at lower Ni compositions. LaNi0.4Ce0.6O3. showed the highest conversion of CH4 and CO2. The H-2/CO ratio in the syngas was stable at 0.85 +/- 0.02. The performance of the sol-gel catalysts was compared with that of the hydrothermally prepared catalysts, reported earlier. High surface area and better Ni dispersion were found to be the reasons for superior activity of the sol-gel catalysts.
机译:通过改变Ni组成(0≤x≤1)的溶胶-凝胶法制备La-Ni-x-Ce1-x混合氧化物催化剂。通过X射线衍射(XRD),电感耦合等离子体发射光谱(ICP-OES),BET表面积,X射线光电子能谱(XPS),程序升温还原(TPR),H-2化学吸附来表征催化剂和傅立叶变换红外光谱(FT-IR)技术。在大气压力和800摄氏度下进行甲烷的CO2重整,同时保持反应物CO2 / CH4 / N-2的比率为80/80/80(总流速= 240 ml min(-1),GHSV为28800 h (-1))。即使在较低的Ni组成下,催化剂也提供较高的活性。 LaNi0.4Ce0.6O3。显示出CH4和CO2的最高转化率。合成气中的H-2 / CO比稳定在0.85 +/- 0.02。将溶胶-凝胶催化剂的性能与先前报道的水热制备的催化剂的性能进行了比较。发现高表面积和更好的Ni分散是溶胶-凝胶催化剂具有优异活性的原因。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号