The Effect of K Promoter on Ni-Co (Bimetallic) Catalyst for Dry Methane Reforming

  • Dharmasaroja, Nichthima ;
  • Phongaksorn, Monrudee ;
  • Tungkamani, Sabaithip ;
  • Ratana, Tanakorn ;
  • Sornchammi, Thana
  • Received : 2015.07.15
  • Accepted : 2015.11.16
  • Published : 2015.12.31


10 wt% (Ni-Co) catalysts with different Ni and Co content : 10%Ni, 9%Ni1%Co, 7%Ni3%Co, 5%Ni5%Co, 3%Ni7%Co, and 10%Co; were prepared using sol-gel method followed by incipient wetness impregnation method. To investigate the catalytic activity including the stability, dry methane reforming were demonstrated over the pelletized catalysts at $620^{\circ}C$ under atmospheric pressure in a $CH_4:CO_2:N_2$ feedstock for 360 min. The results showed that bimetallic catalysts with the Co content equal to or greater than 3% were more stable than monometallic catalysts (10%Ni and 10%Co). The temperature programmed hydrogenation interpreted that the additional of Co into Ni catalyst improved the carbon resistance from methane cracking. Promoted this type of bimetallic catalyst using 1wt% K (trimetallic catalyst) prevented the carbon formation on the catalyst. The temperature programmed desorption of $CO_2$ indicated that this trimetallic catalyst has a greater number of strong basic sites. Moreover, the appearance of K lowered the number of weak basic sites and decreased the conversion of methane by 12 %.


Dry methane reforming;Bimetallic;Trimetallic;Promoter


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