Hydrodesulfurization CoMo/Al2O3 and CoMo/C Catalysts Prepared with Nitrilotriacetic Acid without Use of NH4OH

0431232 - ÚCHP 2015 CZ eng C - Conference Paper (international conference)
Kaluža, Luděk - Zdražil, Miroslav - Vít, Zdeněk
Hydrodesulfurization CoMo/Al2O3 and CoMo/C Catalysts Prepared with Nitrilotriacetic Acid without Use of NH4OH.
Final program. Prague: Orgit, 2014, s. 86. ISBN 978-80-02-02555-9.
[International Congress of Chemical and Process Engineering /21./ - CHISA 2014 and Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction /17./ - PRES 2014. Prague (CZ), 23.08.2014-27.08.2014]
R&D Projects: GA ČR GAP106/11/0902
Institutional support: RVO:67985858
Keywords : hydrodesulfurization * sulfidation * catalysts
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

We have calculated and experimentally confirmed that in the catalysts without NTA before sulfidation, the deposited phase takes up only about 5% of the pore volume of Al2O3 support. The deposited Co-Mo-O phase forms a monolayer and all Co-Mo-species are in physical and chemical contact with the support surface. In NTA catalysts before sulfidation, the deposited NTA-Co-Mo phase takes up about 60% of the pore volume of Al2O3. During sulfidation, the metal-support interaction of the majority of the Co and Mo species is blocked not only chemically by their own NTA ligands, but also physically by the surrounding supported solid. The majority of deposited solid in dried NTA catalysts is sulfided as if it were in the unsupported form. This leads to different morphology and structure of Co-Mo sulfides as compared with the catalysts without NTA. It was concluded that the overall NTA action is a combination of not only chemical effects described in the literature, but also of the above physical effect.
Permanent Link: http://hdl.handle.net/11104/0235813