催化作用
烧结
二氧化碳重整
甲烷
材料科学
吸附
化学工程
氢
程序升温还原
碳纤维
化学
透射电子显微镜
无机化学
合成气
冶金
纳米技术
物理化学
复合材料
有机化学
工程类
复合数
作者
Fagen Wang,Kaihang Han,Leilei Xu,Hao Yu,Weidong Shi
标识
DOI:10.1021/acs.iecr.0c06020
摘要
Low-temperature methane dry reforming (MDR) over supported Ni catalysts is a more economical way to convert greenhouse gases than high-temperature MDR. However, sintering from Ni aggregation and carbon deposition from deep cracking of CH4 caused catalyst deactivation. In this study, we synthesized a supported Ni/SiO2-E catalyst by strong electrostatic adsorption for low-temperature MDR (673–773 K). Experimental results showed that the Ni/SiO2-E catalyst exhibited higher performance on using low-temperature MDR than the Ni/SiO2-I catalyst prepared by the conventional impregnation method. From characterizations of X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H2-TPR), etc. in fresh catalysts and used catalysts, the excellent stable performance of MDR over the Ni/SiO2-E catalyst was associated with the smaller Ni size and the stronger Ni–SiO2 interaction. The former contributed to less formation of carbon deposits and the latter resulted in hardly any sintering of Ni nanoparticles.
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