(314d) Methane Dry Reforming on Nico/SiO2 Catalyst Prepared By Surface Restricted Combustion Synthesis Technique

In this work, a report the synthesis and catalytic performance of bi-metallic supported catalyst of NiCo/SiO₂ for methane dry reforming (MDR). The catalysts were synthesized using two different synthesis methods; combustion synthesis [1–3] and physical-mixing methods, to evaluate the effect of catalyst preparation technique on dry reforming performance. In the physically mixed method, the precursors nickel-nitrate and cobalt-nitrate are dissolved in water and combusted in presence of glycine and the resulted powders are mixed with silica; whereas in the solution combustion synthesis the precursors are dissolved in silica dispersed water, and combusted to get the supported catalyst. The catalysts are then calcined at 600 ^oC for an hour, and used for MDR stability tests at 700^oC. The 10 wt.% NiCo/SiO₂-PM catalyst shows CH₄ conversion drop from 48% to 44%, while CO₂ conversion change from 61% to 56% in 20h TOS. The combustion synthesized catalyst shows exceptionally higher conversion of both CH₄ and CO₂ for 70 h TOS. The CH₄ conversion changed from 93% to 87%, and CO₂ decreased from 96 % and 90%. Based on our detailed analysis (SEM, TEM, NAP-XPS, XAS (XANES and EXAFS), a strong metal-support interaction is found in CM catalyst [4,5]. The NAP-XAS analysis shows how the surface composition and oxidation states change in presence of reactive gases.

References:

[1] Kumar A, Wolf EE, Mukasyan AS., AIChE J 2011;57:3473–3479.

[2] Kumar A, Wolf EE, Mukasyan AS., AIChE J 2011;57:2207-2214.

[3] Ashok A, Kumar A, Ponraj J, Mansour SA, Tarlochan F., Appl Catal B Environ 2019;254:300-311.

[4] Mohammed AAA, Saad MAHS, Kumar A, Al‐Marri MJ., Greenh Gases Sci Technol 2020;10:715–24.

[5] Kumar A, Mohammed AAA, Saad MAHS, Al‐Marri MJ., Int J Energy Res 2021:er.6586. https://doi.org/10.1002/er.6586.