Preparation and characterization of molybdenum trioxide from spent hydrodesulfurization catalyst

Barsha Dash; Indra Narayan Bhattacharya; Bhaskara Venkata Ramanamurthy; Raja Kishore Paramguru

Korean Journal of Chemical Engineering, Vol.28, No.7, 1546-1549, July, 2011

DOI10.1007/s11814-011-0005-9 Export Citation

Preparation and characterization of molybdenum trioxide from spent hydrodesulfurization catalyst

Barsha Dash^†, Indra Narayan Bhattacharya, Bhaskara Venkata Ramanamurthy, and Raja Kishore Paramguru

Institute of Minerals and Materials Technology, Bhubaneswar-751013, Orissa, India

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An approach to produce molybdenum trioxide from spent hydrodesulfurization (HDS) catalyst, obtained from a petroleum refinery, is presented here. The spent catalyst was devolatilized at 600 ℃ so as to make it free from oils, organics and other volatile species. It was then roasted with sodium carbonate at a temperature of 850 ℃ for 30 min. The leaching efficiency for 20% soda roasted sample at 10% pulp density was 99.8%. From the solution molybdenum was precipitated out as ammonium molybdate at pH 1.0 with HCl and ammonium chloride. This ammonium molybdate was calcined at 750 ℃ to get MoO3. The product was characterized by XRD. Its purity was determined titrimetrically and by ICP-AES.

Keywords:Spent Catalyst;Soda Roasting;Leaching;Molybdenum;Molybdenum Trioxide

[References]

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[3] Kar BB, Int. J. Miner Process., 75, 249 (2005)

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[5] Chen Y, Feng Q, Shao Y, Zhang G, Ou L, Lu Y, Int. J. Miner. Process., 79, 42 (2006)

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[9] An JW, Lee YH, Kim SJ, Tran T, Lee SO, Kim MJ, Miner. Eng., 22, 1020 (2009)

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[15] Busev AI, Tiptsova VG, Ivanov VM, Analytical chemistry of rare elements, Mir Publishers Moscow, 221 (1981)