(521dc) Surface Restricted Combustion Synthesis of Ni-Co/SiO2 Catalysts for Methane Dry Reforming Reaction | AIChE

(521dc) Surface Restricted Combustion Synthesis of Ni-Co/SiO2 Catalysts for Methane Dry Reforming Reaction

Authors 

Yuda, A. - Presenter, Qatar University
Kumar, A. - Presenter, Qatar University
Saad, M. A. H. S., Qatar University
Herein, we 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 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 700oC. 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. The NAP-XAS analysis shows how the surface composition and oxidation states change in presence of reactive gases.