Solid State Science and Technology, Vol. 15, No 2 (2007) 161-166
A SUPPORTED TITANIUM BASED CATALYST FOR IN-SITU HYDROGEN SULPHIDE DESULPHURIZATION AND CARBON DIOXIDE METHANATION REACTION IN NATURAL GAS
Junaidi Mohamad Nasir, Wan Azelee Wan Abu Bakar and Mohd Yusuf Othman
Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia,
81310 UTM Skudai, Johor, Malaysia
Malaysian crude natural gas contains various gases components including methane (40-50%), ethane (5-10%) and propane (1-5%). However, this crude natural gas also contain H2S (1–5%) and CO2 (20-30%) which have the ability to corrode carbon steel used in the natural gas pipeline system and material in the processing plant. Fe3+/Zn2+/Cu2+/Ti4+/Al2O3 with the ratio 0.1:0.1:0.8:1 was prepared to produce the best catalyst for in-situ reaction of H2S desulphurization and CO2 methanation. This catalyst was produced via modified sol-gel and impregnation methods and was calcined at 400oC for 5 hours. The results of catalytic activity testing for the Fe3+/Zn2+/Cu2+/Ti4+/Al2O3 showed H2S desulphurization percentage of 100% and 0.9% methanation at aworkable plant reaction temperature of 100oC. This catalyst also had the lowest of H2S adsorption with 1.9% at the range of room temperature to 40oC and it also could oxidize the highly concentration of H2S with 94.3% at the low temperature of 40oC. Importantly, this catalyst could be regenerated via heating at 200oC for 3 hours under compressed air flow at the rate of 100mLmin-1. The XRD analysis only showed the present three peaks due to cubic phase of γ-Al2O3. The Ti, Cu, Zn and Fe elements present in the catalyst matrix system were presumably to be homogeneously dispersed on the surface of alumina support besides their presence in very low concentration. The SEM micrograph showed that this catalyst had homogeneous size particles.
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