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Ni/SiO2 Catalyst Prepared by Strong Electrostatic Adsorption for a Low-Temperature Methane Dry Reforming Reaction
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-02-16 , DOI: 10.1021/acs.iecr.0c06020
Fagen Wang 1, 2 , Kaihang Han 1 , Leilei Xu 3 , Hao Yu 4 , Weidong Shi 1
Affiliation  

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.

中文翻译:

低温甲烷干重整反应强静电吸附制备的Ni / SiO 2催化剂

与高温MDR相比,在负载型Ni催化剂上进行低温甲烷干重整(MDR)是一种更经济的转化温室气体的方法。但是,Ni聚集引起的烧结和CH 4的深度裂化造成的碳沉积导致催化剂失活。在这项研究中,我们通过强静电吸附合成了负载型Ni / SiO 2 -E催化剂,用于低温MDR(673–773 K)。实验结果表明,与常规浸渍法制备的Ni / SiO 2 -I催化剂相比,Ni / SiO 2 -E催化剂在使用低温MDR时表现出更高的性能。从X射线衍射(XRD),透射电子显微镜(TEM),氢程序升温还原(H 2-TPR)等在新鲜催化剂和用过的催化剂中,MDR优于Ni / SiO 2 -E催化剂的优异稳定性能与较小的Ni尺寸和较强的Ni-SiO 2相互作用有关。前者有助于减少碳沉积物的形成,而后者几乎不会导致镍纳米颗粒的任何烧结。
更新日期:2021-03-03
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