Study on carbon deposition associated with catalytic CH4 reforming by using density functional theory

Study on carbon deposition associated with catalytic CH4 reforming by using density functional theory
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密度泛函理论研究CH4催化重整过程中的碳沉积

DOI:
10.1016/j.fuel.2013.06.022
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发表时间:
2013-11
期刊:
影响因子:
7.4
通讯作者:
Harris H. Gordon
Harris H. Gordon
中科院分区:
工程技术1区
文献类型:
--
作者:
Henson Neil;Zhang Yulong;Towler Brian Francis;Harris H. Gordon

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用密度泛函理论(DFT)研究了CH_4,CH_3,CH_2,CH,C,H在Co双金属Ni Fe(1 1 1)催化剂表面的吸附和解离.重点分析了它们在单质金属(Fe、Co、Ni、Cu)和双金属(NiFe、NiCo、NiCu)上的吸附和解离。计算了催化剂的吸附能、活化能、反应能和d-带中心,并建立了它们之间的线性关系。吸附能随着催化剂表面d带中心远离费米能级而降低,从而活化能和反应能增加。因此,一个好的CH 4/CO2重整催化剂应该具有一个缓和带中心。研究发现,在Fe、Co、Ni、Cu、NiFe、NiCo、NiCu和NiCu(S)[偏析NiCu] 8种CH 4/CO2重整催化剂中,偏析NiCu是最好的一种。
Density functional theory (DFT) has been applied to investigate the adsorptions of CH4, CH3, CH2, CH, C, H and dissociations CH4, CH3, CH2, CH on the (1 1 1) catalyst surfaces of elementary metals Co bimetals NiFe. More important, the adsorptions and dissociations of those adspecies on elementary metals (Fe, Co, Ni and Cu) and bimetals (NiFe, NiCo and NiCu) have been analyzed. The adsorption energies, activation energies, reaction energies andd-band centers of the catalysts were calculated and their linear correlations were established. The adsorption energy decreases with thed-band center of the catalyst surface shift away from the Fermi level, and thus the increase in activation energy and reaction energy. Therefore, a good catalyst should have a moderated-band center in CH4/CO2reforming. This research finds that segregated NiCu is the best one among the eight CH4/CO2reforming catalysts, Fe, Co, Ni, Cu, NiFe, NiCo, NiCu, and NiCu(S) [segregated NiCu].
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