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Upgrading of coal liquids by Hydrous Metal Oxide catalysts

Hydrous Metal Oxides (HMOs) are chemically synthesized materials which contain a homogeneous distribution of ion exchangeable alkali cations that provide charge compensation to the metal-oxygen framework. Both the presence of these alkali cations and the resulting high cation exchange capacities (4-...

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Autori principali: Sandia National Labs., Albuquerque, NM (United States), S Lott, USDOE, Washington, DC (United States), T Gardner, L McLaughlin, J.B. Oelfke
Natura: Report
Lingua:inglese
Pubblicazione: 1994
Soggetti:
Catalysis and Hydrodesulfurization Studies
Nanomaterials for catalytic reactions
Petroleum Processing and Analysis
hydrous metal oxides
NiMo catalysts
coal liquefaction
coal liquids
hydrodesulfurization
hydrodenitrogenation
supported catalysts
cation exchange capacity
Accesso online:https://www.osti.gov/servlets/purl/10158468
https://doi.org/10.2172/10176929
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Riassunto:Hydrous Metal Oxides (HMOs) are chemically synthesized materials which contain a homogeneous distribution of ion exchangeable alkali cations that provide charge compensation to the metal-oxygen framework. Both the presence of these alkali cations and the resulting high cation exchange capacities (4--5 meq/g) clearly set these HMO materials apart from conventional precipitated hydrous oxides. For catalyst applications, the HMO material serves as an ion exchangeable support which facilitates the uniform incorporation of catalyst precursor species. Following catalyst precursor incorporation, an activation step is required to convert the catalyst precursor to the desired active phase. Considerable process development activities at Sandia National Laboratories related to HMO materials have resulted in bulk silica-doped hydrous titanium oxide (HTO:Si)-supported NiMo catalysts that are more active in model compound reactions than commercial NiMo catalysts. These reactions, e.g. pyrene hydrogenation, simulate direct coal liquefaction. However, extension of this process to produce NiMo/HTO:Si catalyst coatings on commercial supports is of interest for liquefaction applications since overall catalyst cost can be reduced and bulk HTO:SI mechanical limitations can be circumvented. In the present effort, NiMo/HTO:Si has been evaluated for hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of coal derived liquids. NiMo/HTO:Si catalysts have been evaluated in both bulk (unsupported) form and a supported form on commercial alumina extrudates.
DOI:10.2172/10176929

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