Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-IV-29THE PARTIAL OXIDATION OF CH 4 TO SYNGAS OVERRHODIUM AND NICKEL MODIFIED HEXAALUMINATESN.B. Touahri 1 , A. Djadoun 3 , R. Chebout 1 , A. Benadda 1 , P. Ruiz 2 and A. Barama 11 Laboratoire de Chimie de Gaz Naturel, Faculté de chimie USTHB BP 32, ElAlia, BabEzzouar Alger Algérie. E-mail: benaddaamel@yahoo.fr2 Unité de catalyse et de chimie des matériaux divisés CATA-Croix du sud, 2, bte.17 à 1348Louvain-la-Neuve Brussels, Belgique3 Laboratoire de Géophysique FSTGAT, USTHB BP 32, ElAlia, Bab Ezzouar, Alger, AlgérieIntroductionHydrogen production has been attracting great interest as a future clean fuel particularlyfor combustion engine and fuel cells. This is why; an efficient and compact hydrogenproduction process should be developed for such application purposes [1].The partial oxidation of methane, leading to synthesis gas (H 2 and CO), has received biginterests from the perspectives of enhancement of natural gas utilization.Although precious metals, such as Rh, Pt and Pd, have been employed successfully forthis reaction in terms of activity and selectivity, high price and limited availability of thesemetals makes their widespread industrial application impractical.Thus, attention has been paid to ferrous transition metals (Ni, Co, Fe) for these goals.Particularly, nickel has been explored as a possible substitute for precious metals because offast turnover rates, high activity and low cost [2].However, previous investigations have provided evidence that nickel is more susceptibleto coking at elevated temperatures than precious metals are.And during high temperature reactions sintering and loss of nickel is difficult to avoid inindustrial applications. Despite of the foregoing disadvantages, nickel is the metal of interestindustrially due to economic reasons.The use of materials which resist to sintering is though suitable for reactions such as thepartial of methane.ExperimentalIn the present study, catalysts based on hexaaluminate-type oxides, BaM x Al 12-x O 19-α(M=Rh, Ni; x=0.05-0.1-0.15) were prepared via the citrate method, calcined at 1000, 1200and 1400°C. The physico-chemical properties of the solids were investigated using X-raydiffraction (XRD), Temperature-programmed reduction (TPR) and BET measurements.446