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Abstract
This work presents, for the first time, the catalytic studies of bimetallic Ag-Ni catalysts in the oxy-steam reforming (OSR) of liquefied natural gas (LNG) to hydrogen generation. The physicochemical properties of monometallic Ni and bimetallic catalysts were investigated using various techniques, such as: BET, TPR-H2, TPD-NH3, XRD, TG and SEM-EDS. The catalytic studies showed that the promotion of 20% Ni/ZrO2 catalyst by silver (by 1 or 2 wt.%) improves the efficiency of the produced hydrogen in the oxy-steam reforming of LNG at high temperature. The promotional effect of silver on the reducibility of a Ni/ZrO2 catalyst has been proven. The interactions between Ag and Ni have been proven, and explain the catalytic activity of the catalysts in the investigated processes. TG-DTA-MS results obtained for the spent catalysts proved that the small addition of silver to monometallic nickel catalyst reduces the amount of the carbon deposit formed on the catalyst surface during the oxy-steam reforming of LNG process. Obtained results in this work confirmed that liquid natural gas processing may become an alternative to fossil fuels and confirmed the validity of the hydrogen production via oxy-steam reforming of LNG.
Highlights
Liquefied natural gas (LNG) is a colourless, non-toxic, non-corrosive and clear liquid mixture, containing mainly methane (88.4 to 99.7%) and other light hydrocarbons such as: ethane, propane, butane and nitrogen
The main goal of the presented paper was to determine the effect of silver addition on the catalytic behaviour of the monometallic Ni catalysts in the oxy-steam reforming of methane and liquified natural gas (LNG) processes
The catalytic activity tests in the oxy-steam reforming of methane and liquefied natural gas (LNG)
Summary
Liquefied natural gas (LNG) is a colourless, non-toxic, non-corrosive and clear liquid mixture, containing mainly methane (88.4 to 99.7%) and other light hydrocarbons such as: ethane, propane, butane and nitrogen. Hosseini et al [23] investigated nickel catalysts supported on Al2 O3 prepared by traditional (UM-Ni/Al2 O3 ) and under-microwave irradiation (M-Ni/Al2 O3 ) impregnation methods They determined the effect of preparation method of the catalyst on the catalytic reactivity in the oxy-steam reforming of methane reaction. Wen-Sheng Dong et al [27] studied the effect of nickel content on the catalytic properties of Ni/Ce-ZrO2 catalyst in the partial oxidation, steam and oxy-steam reforming of methane reactions. The main goal of the presented paper was to determine the effect of silver addition on the catalytic behaviour of the monometallic Ni catalysts in the oxy-steam reforming of methane and liquified natural gas (LNG) processes. The reactivity results in the oxy-steam reforming of methane and LNG of the investigated systems were correlated with their physicochemical properties
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