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Title: Characterization and catalytic activity of Ni-W/SiO2-Al2O3 hydrocracking catalysts
Authors: Sharma, L D
Kumar, Manoj
Gupta, J K
Rana, M S
Dangwal, V S
Dhar, G Murali
Issue Date: May-2001
Publisher: NISCAIR-CSIR, India
Abstract: Characterization of Ni-W SiO2-Al2O3 catalysts was carried out by microcalorimetry, TPR and oxygen chemisorption. The effect of incorporation of individual metals and their sequence of addition to the support on the properties and catalytic activity for cyclohexene hydrogenation and cumene cracking was investigated. While the addition of nickel to SiO2-Al2O3 has little effect on the acidity, tungsten has generated some new strong acid sites, which do not seem to have beneficial effect for cumene cracking. Low temperature TPR peak in the bimetallic catalysts falls around 760 K due to Ni-W species while the high temperature peak around 1115-1223K corresponds to W species. W/SiO2-Al2O3 has a lower oxygen chemisorptions than its nickel counterpart but has a higher hydrogenation rate. Tungsten is the active metal for hydrogenation. W-Ni/SiO2-Al2O3 catalyst has better hydrogenation and cracking activity.
Page(s): 169-175
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.08(3) [May 2001]

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