Hydrocracking of cumene over Ni/Al2O3 as influenced by CeO2 doping and γ-irradiation

El-Shobaky, G.A.; Doheim, M. M.; Ghozza, A.M.

doi:10.1016/s0969-806x(03)00444-4

Cited by 10 publications

(5 citation statements)

References 25 publications

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“…Hydrogenation products should be formed and the effect of the solid should be time-limited, until all unsaturated hydrocarbons available are hydrogenated or until all the available hydrogen is consumed. Irradiation might also affect the catalytic properties of the irradiated solid[30,31]. 2.…”

mentioning

confidence: 99%

Trapping of radiolytic hydrogen by amorphous cobalt oxysulfide

Loussot¹,

Pichon²,

Afanasiev³

et al. 2006

Journal of Nuclear Materials

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mentioning

confidence: 99%

Trapping of radiolytic hydrogen by amorphous cobalt oxysulfide

Loussot¹,

Pichon²,

Afanasiev³

et al. 2006

Journal of Nuclear Materials

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“…Examination of this table showed that CeO 2 doping of NiO/Al 2 O 3 resulted in a measurable increase in its S BET surface to an extent proportional to the amount of dopant added. It is also noticed that the S BET of these solids increased with increasing the calcination temperature from 300 to 400°C which can be ascribed to creation of new pores through thermal treatment process, as well as the effective decrease in the crystallite size of particles of the doped solids [7,8,14].…”

Section: Specific Surface Area Of Pure and Variously Doped Solidsmentioning

confidence: 95%

“…(iv) the pure and doped solids calcined at 900°C resulted in formation of nickel aluminate as a result of solid-solid interactions between the reacting oxides [14,22,23] as follows:…”

Section: Xrd Investigation Of Pure and Variously Doped Solids Calcinementioning

confidence: 99%

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Effects of doping with CeO2 and calcination temperature on physicochemical properties of the NiO/Al2O3 system

Shaheen¹,

El-Hendawy

2009

Open Chemistry

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Abstract:The effects of doping with CeO 2 and calcination temperature on the physicochemical properties of the NiO/Al 2 O 3 system have been investigated using DTA, XRD, nitrogen adsorption measurements at -196°C and decomposition of H 2 O 2 at 30-50°C. The pure and variously doped solids were subjected to heat treatment at 300, 400, 700, 900 and 1000°C. The results revealed that the specific surface areas increased with increasing calcination temperature from 300 to 400°C and with doping of the system with CeO 2 . The pure and variously doped solids calcined at 300 and 400°C consisted of poorly crystalline NiO dispersed on γ-Al 2 O 3. Heating at 700°C resulted in formation of well crystalline NiO and γ-Al 2 O 3 phases beside CeO 2 for the doped solids. Crystalline NiAl 2 O 4 phase was formed starting from 900°C. The degree of crystallinity of NiAl 2 O 4 increased with increasing the calcination temperature from 900 to 1000°C. An opposite effect was observed upon doping with CeO 2 . The NiO/Al 2 O 3 system calcined at 300 and 400°C has catalytic activity higher than individual NiO obtained at the same calcination temperatures. The catalytic activity of NiO/Al 2 O 3 system increased, progressively, with increasing the amount of CeO 2 dopant and decreased with increasing the calcination temperature.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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“…The catalytic activity and selectivity of a large variety of catalysts can be modified by various methods such as loading on a finely divided support [1][2][3][4][5][6], subjecting to ionizing radiations [7][8][9][10][11][12][13][14][15] and doping with certain foreign oxides [16][17][18][19][20][21][22]. The loading on suitable support material results in an increase in the concentration of catalytically active constituents via increasing their dispersity and hindering their grain growth.…”

Section: Introductionmentioning

confidence: 99%