Dry reforming of methane (DRM) is an effective method to change two main greenhouse gases (CH4 and CO2) into valuable chemicals such as hydrogen.

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To date, various promoters (noble and non-noble metals) have been employed to improve the activity of the nickel-based catalysts in dry methane reforming (DMR), an essential and challenging endothermic chemical reaction. In this study, for the first time, we thoroughly investigated the promotional effect of cadmium over Ni@γ-Al 2 O 3 for DMR (CH 4 /CO 2 = 1:1) under four temperatures (600−750 °C). In this line, several monometallic and bimetallic catalysts based on the commercial aluminum oxide anhydrous were synthesized through precipitation−deposition. The synthesized catalysts (Cd/Ni@ Al 2 O 3 ) were characterized by utilizing N 2 adsorption−desorption (BET), X-ray diffraction, scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy, H 2 temperature-programmed reduction, CO 2 temperature-programmed desorption (CO 2 -TPD), H 2 temperature-programmed desorption (H 2 -TPD), thermal gravimetric analysis, and X-ray photoelectron spectroscopy. Based on the obtained results, alloying nickel with cadmium amplified nickel particles' reducibility and significantly increased its dispersion (dilution effect) and basicity of the prepared catalysts. These features resulted in the high activity and stability of Cd(5%)/Ni(15%)@Al 2 O 3 in DMR reaction under 600−750 °C. Remarkably, this catalytic process showed high resistance toward coke formation (graphite carbon about 10%) and excellent activity after a 30 h catalytic run at 700 °C.