Role of Mixed Oxides in Hydrogen Production through the Dry Reforming of Methane over Nickel Catalysts Supported on Modified γ-Al2O3

Processes

YousefAbdulrahman Albaqmaa¹  AhmedSadeq Al-Fatesh¹  AnisHamza Fakeeha¹  AhmedAidid Ibrahim¹  Fahad Al-Mubaddel¹  SamsudeenOlajide Kasim¹  AbdulazizA. Bagabas²  Rawesh Kumar³  Rutu Patel³  MayankkumarLakshmanbhai Chaudhary³ 

[1] Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;National Petrochemical Technology Center (NPTC), Materials Science Research Institute (MSRI), King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia;Sankalchand Patel University, Visnagar 384315, India;

关键词: H₂ production;    mixed oxide;    NiAl₂O₄;    NiWO₃;    NiSiO₃;    NiO-interacting species;   

DOI  :  10.3390/pr9010157

来源: DOAJ

【 摘 要 】

H₂ production through dry reforming of methane (DRM) is a hot topic amidst growing environmental and atom-economy concerns. Loading Ni-based reducible mixed oxide systems onto a thermally stable support is a reliable approach for obtaining catalysts of good dispersion and high stability. Herein, NiO was dispersed over MO_x-modified-γ-Al₂O₃ (M = Ti, Mo, Si, or W; x = 2 or 3) through incipient wetness impregnation followed by calcination. The obtained catalyst systems were characterized by infrared, ultraviolet–visible, and X-ray photoelectron spectroscopies, and H₂ temperature-programmed reduction. The mentioned synthetic procedure afforded the proper nucleation of different NiO-containing mixed oxides and/or interacting-NiO species. With different modifiers, the interaction of NiO with the γ-Al₂O₃ support was found to change, the Ni²⁺ environment was reformed exclusively, and the tendency of NiO species to undergo reduction was modified greatly. Catalyst systems 5Ni3MAl (M = Si, W) comprised a variety of species, whereby NiO interacted with the modifier and the support (e.g., NiSiO₃, NiAl₂O₄, and NiWO₃). These two catalyst systems displayed equal efficiency, >70% H₂ yield at 800 °C, and were thermally stable for up to 420 min on stream. 5Ni3SiAl catalyst regained nearly all its activity during regeneration for up to two cycles.

【 授权许可】

Unknown