Abstract
Ni-based catalysts (Ni-γ-Al2O3, Ni-HTASO5 and Ni-CeZrOx) were prepared by impregnation method and characterized by BET, AAS, XRD, H2-TPR, CO-TPD, NH3-TPD, XPS, TG-DSC-MS and Raman spectroscopies. Using CeZrOx-modified Al2O3 (HTASO5) as support, the catalyst exhibited good catalytic performance (TOFCH4 = 8.0 × 10−2 s−1, TOFH2 = 10.5 × 10−2 s−1) and carbon resistance for steam-methane reforming (SMR) reaction. Moreover, CeZrOx was able to enhance water-gas shift (WGS) reaction for more hydrogen production. It was found that the addition of CeZrOx could increase the content of active nickel precursor on the surface of the catalyst, which was beneficial to the decomposition of water and methane on Ni-HTASO5. Furthermore, Ni-HTASO5 could decrease the strong acid sites of the catalyst, which would not only contribute to the formation of low graphited carbon, but also decrease the amount of carbon deposition.
Highlights
Hydrogen is considered an important part of future energy systems
Removing the products (H2, CO2 ) or enhancing adsorption of CO and H2 O on the catalyst are both beneficial to water-gas shift (WGS) reaction for hydrogen production
The higher turnover frequency (TOF) of H2 implies that WGS
Summary
Hydrogen is considered an important part of future energy systems. With the development of the hydrogen fuel cell, the application of H2 in vehicles and energy fields has aroused the interest of many researchers. Using Ni-based catalysts, methane can react with H2 O, O2 or CO2 to produce hydrogen and carbon monoxide [1,2,3]. Because of its high H2 /CO ratio, steam–methane reforming reaction (Equation (1)) is the main approach of hydrogen production in industry. When water-gas shift (WGS) reaction (Equation (2)) occurs simultaneously, it will increase the yield of hydrogen. Removing the products (H2 , CO2 ) or enhancing adsorption of CO and H2 O on the catalyst are both beneficial to WGS reaction for hydrogen production
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