Water formation through reverse water gas shift and several other side reactions in carbon dioxide reforming of methane (CORM) have became one of the major process hurdles that limits maximum hydrogen and syngas (H 2 -CO mixture) yields. Therefore, it is vital that the study on CORM thermodynamic equilibrium takes into consideration the formation of water in the CORM reaction network. Due to the complexity of the reaction network, Lagrange's undetermined multiplier was employed in the present

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... rk and its applicability had been proven throughout this study. The equilibrium compositions improved drastically from 600-1000K, but the temperature effect becomes insignificant above 1000K. Furthermore, CO/H 2 ratio close to unity can be achieved at lower CO 2 /CH 4 feed ratios but equal CO 2 /CH 4 feed ratios is required to obtain higher H 2 and CO yields at temperature 1000K and above. These findings are in strong agreement with laboratory experimental results reported in literature. Abstrak. Pembentukan air melalui reverse water gas shift serta tindakbalas-tindakbalas sampingan lain dalam proses pembentukan semula metana menggunakan karbon dioksida (CORM) menjadi salah satu masalah utama yang menghadkan penghasilan maksima hidrogen and singas (campuran H 2 -CO). Dengan ini, kajian ke atas keseimbangan termodinamik CORM seharusnya mengambil kira kesan pembentukan air dalam rangkaian tindakbalas CORM. Disebabkan oleh rangkaian tindakbalas CORM yang kompleks, kaedah Lagrange's undetermined multiplier digunakan dalam kajian ini dan keberkesanannya telah dibuktikan. Prestasi equilibria CORM dipertingkatkan daripada 600K kepada 1000K tetapi kesan suhu menjadi tidak bermakna pada suhu melebihi 1000K. Nisbah CO/H 2 menghampiri satu boleh dicapai dengan nisbah suapan CO 2 /CH 4 yang rendah tetapi nisbah suapan CO 2 /CH 4 yang sama diperlukan untuk memperoleh penghasilan H 2 dan CO yang tinggi pada suhu 1000K ke atas. Keputusan ini disokong oleh keputusan eksperimen seperti yang dilaporkan dalam literatur. Kata kunci: Karbon dioksida, metana, singas, pembentukan air, Lagrange's undetermined multiplier 1&2