Catalysis Letters

, Volume 148, Issue 5, pp 1416–1422 | Cite as

Catalytic Decomposition of Hydrogen-Iodide Over Nanocrystalline Ceria Promoted by Transition Metal Oxides for Hydrogen Production in Sulfur–Iodine Thermo-Chemical Cycle

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Abstract

In this study, CeO2, and CeO2-M (M=Fe, Co, and Ni) catalysts were prepared by sol–gel method for catalytic decomposition of hydrogen-iodide in sulfur–iodine (SI) cycle. These catalysts sample were characterized by Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), transmission electron microscopy (TEM), and Raman spectroscopy. The powder XRD, and TEM results gave 4–5 nm average size particles of CeO2–Ni-300 sample. BET and Raman results showed a high specific surface area, and large number of oxygen vacancy in the Ni sample. The hydrogen-iodide decomposition experiments were carried out in the temperature range of 400–550 °C in a quartz-tube vertical fixed-bed reactor with 55 wt% HI feed over prepared CeO2-M catalysts using nitrogen as a carrier gas at atmospheric pressure. The experimental hydrogen-iodide decomposition results showed high catalytic activity of Ni sample as compared to Co and Fe samples. They followed the catalytic order: CeO2–Ni-300 > CeO2–Co-300 > CeO2–Fe-300 > CeO2-300. The effect of calcination temperatures (300, 500, and 700 °C) of CeO2–Ni sample (during sol–gel method) on hydrogen-iodide conversion was also studied and showed that the following catalytic order: CeO2–Ni-300 > CeO2–Ni-500 > CeO2–Ni-700. With increase in calcination temperatures the conversion decreased. CeO2–Ni-300 sample also gave a reasonable stability for time-on-stream of about 5 h. So, based on these results, CeO2–Ni-300 is an attractive candidate which has potential for producing large quantity of hydrogen in SI cycle.

Graphical Abstract

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Keywords

Hydrogen-iodide decomposition Ceria Transition metal oxides Catalytic activity Hydrogen production Sulfur-iodine cycle 
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Notes

Acknowledgements

The author wants to thank central facility of IIT Delhi, New Delhi, India, for granting access to characterization instruments. This work was supported by ONGC Energy Centre Trust [RP02148], New Delhi, India.

Compliance with Ethical Standards

Conflict of interest

The author declares there is no conflict of interest.

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Authors and Affiliations

  1. 1.Department of Chemical EngineeringIndian Institute of Technology, DelhiNew DelhiIndia

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