Abstract
Herein, we report monometallic Ni and bimetallic Pd–Ni catalysts supported on CeO2–Al2O3 binary oxide which are highly active and selective in oxy-steam reforming of methanol (OSRM). Monometallic and bimetallic supported catalysts were prepared by an impregnation method. The physicochemical properties of the catalytic systems were investigated using a range of methods such as: Brunauer–Emmett–Teller (BET), X-ray Powder Diffraction (XRD), Temperature-programmed reduction (TPR–H2), Temperature-programmed desorption (TPD–NH3), X-ray photoelectron spectroscopy (XPS) and Scanning Electron Microscope equipped with an energy dispersive spectrometer (SEM–EDS). We demonstrate that the addition of palladium facilitates the reduction of nickel catalysts. The activity tests performed for all catalysts confirmed the promotion effect of palladium on the catalytic activity of nickel catalyst and their selectivity towards hydrogen production. Both nickel and bimetallic palladium–nickel supported catalysts showed excellent stability during the reaction. The reported catalytic systems are valuable to make advances in the field of fuel cell technology.
Highlights
Over the last decades there have been substantial efforts to develop environmentally friendly sources of energy capable of replacing fossil fuels [1,2,3]
To better understand the influence of the support composition on the catalytic activity in oxy-steam reforming of methanol (OSRM) analogous tests were performed on nickel catalysts supported on Al2 O3 or CeO2 monoxides containing the same nickel content
Monometallic Ni/CeO2 –Al2 O3 and bimetallic Pd–Ni/CeO2 –Al2 O3 catalysts were prepared by an impregnation and subsequent impregnation method, respectively
Summary
Over the last decades there have been substantial efforts to develop environmentally friendly sources of energy capable of replacing fossil fuels [1,2,3]. It was found that the introduction of cerium (IV) oxide into nickel based catalysts improves the metallic dispersion, limits particles agglomeration, and enhances the metal-support interaction All of these factors have a positive effect on the catalytic activity of nickel supported catalysts in dry reforming of methane [31]. It is well documented that promotion of monometallic catalysts by precious metals in most cases improves the catalyst activity [13], stability, and selectivity in the methanol reforming processes. Palladium is an active component for methanol reforming reactions It is an effective decomposition catalyst, selectively forming H2 and CO when it is supported on metal oxide [39,40,41]. These palladium alloys are formed at moderate temperatures under reducing conditions [43]
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