Synthesis of N-CNT-TiO2 Nanocatalyst: Application in Direct Oxidation of H2S to Sulfur

Document Type: Research Article

Authors

1 chemical engineering department, faculty of engineering, Ferdowsi university of Mashhad, Iran

2 Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

3 reseach institute of petroleum industry (RIPI), Tehran, Iran

Abstract

In this study, nitrogen doped MWCNT-TiO2 nanocatalyst (N-CNT-TiO2) with 1, 3 and 5 wt. % nitrogen has been synthesized and its catalytic activity in the oxidation of H2S to sulfur has been studied at temperature of 200°C and O2/H2S mole ratio of 0.5 and compared with those of neat TiO2 and TiO2-CNT hybrid. Their structure, morphology and chemical properties have been determined by N2 adsorption–desorption isotherms, XRD, SEM, TEM, UV and FTIR. N-CNT-TiO2 exhibited improved performance compared with TiO2-CNT due to the presence of nitrogen groups. In addition, the nanocatalyst was comparable (up to 5%) with TiO2 because of the presence of lower band gap and synergistic effects. Furthermore, 5%N-CNT-TiO2 has shown the highest catalytic activity among N-CNT-TiO2 nanocatalysts due to its higher surface area and pore volume.

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