Abstract
In the present study, a series of Ni-Al2O3 catalysts with different Ni loadings were synthesized and tested for the tri-reforming of methane (TRM). The prepared catalysts were characterized by using a variety of techniques. Reduction studies of all high-temperature calcined catalysts revealed the presence of strong metal-oxide interaction with the γ-Al2O3 support. Furthermore, with an increase in the metal amount, the crystallite size of metallic-Ni and metal-support interaction decreased, reached a minimum for the 15Ni-Al catalyst, and then increased for the 22.5Ni-Al catalyst. However, the active metal dispersion increased with an increase in Ni content from 5 wt.% to 15 wt.%, and an additional increase in the metal loading decreased the metal dispersion. 15Ni-Al showed the highest dispersion of 8.6%. The influence of metal amount on catalytic activity was evaluated by carrying out the TRM reaction under ambient pressure and 600 °C. The experimental results showed an enhancement in catalytic activity with an increase in Ni loading from 5 wt.% to 15 wt.%. However, a further increase in Ni amount reduced the catalytic activity due to a decrease in Ni dispersion. The CH4 and CO2 conversions during TRM are relatively constant with time-on-stream, and no carbon deposits were detected. The H2/CO ratio was greater than three for all the catalysts. The superior activity of 15 wt.% Ni-Al2O3 was attributed to the higher Ni dispersion and large availability of active sites. Thus, for the TRM reaction, an optimum loading of 15 wt.% Ni in the xNi-Al catalyst was observed for this alumina support.
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Gupta, S., Deo, G. (2023). Optimization of Nickel Loading of Ni-Al2O3 Catalyst for Syngas Production by Tri-Reforming of Methane. In: Chinthapudi, E., Basu, S., Thorat, B.N. (eds) Sustainable Chemical, Mineral and Material Processing. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-7264-5_21
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