Hydroconversion of C5–C8 alkanes over Zr-containing supported catalysts prepared by metal vapor method

Akhmedov, V. M.; Al-Khowaiter, Soliman H.; Alrefai, Jamal

doi:10.1016/s0926-860x(03)00496-4

Cited by 15 publications

(9 citation statements)

References 28 publications

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“…Improved dispersion of Pt on ZSM-5 by Zr introduction has been reported previously. 18 After oxidation treatment of Cu-Zr-H-MCM-41, 20% of surface Zr was lost while copper dispersion was improved. Pre-treatments had only a minor effect on the dispersion of Zr-H-MCM-41.…”

Section: Characterizationmentioning

confidence: 99%

“…Furthermore, addition of Zr has been reported to stabilize the high dispersion of metals such as Ni, Pd and Pt. 18 MCM-41 is an attractive material to study the effect of metal introduction on the hydrocarbons transformation reactions, as its intrinsic catalytic performance is rather moderate due to mild acidity and thus the effect of the metal introduction can be easily observed. Moreover, the pores of MCM-41 are large enough not to be blocked if a large metal is introduced.…”

Section: Introductionmentioning

confidence: 99%

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Physico-chemical and catalytic properties of Zr- and Cu–Zr ion-exchanged H-MCM-41

Nieminen

Karhu²,

Kumar

et al. 2004

Phys. Chem. Chem. Phys.

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Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physico-chemical and catalytic properties of Zr- and Cu–Zr ion-exchanged H-MCM-41

Nieminen

Karhu²,

Kumar

et al. 2004

Phys. Chem. Chem. Phys.

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“…Research on the catalytic activation of n-octane was dominated by the non-oxidative activation [4][5][6][7][8][9][10][11][12][13], and when oxygen was used for such activation (usually from air) the focus was on the production of hydrogen, syngas, as well as the short-chain olefins [14][15][16][17][18][19][20]. A common feature in these studies was that the linear octenes and styrene were either not formed or formed in small amounts.…”

Section: Introductionmentioning

confidence: 99%

Dehydrocyclization of n-octane over boron- and barium-doped V-Mg-O catalysts: influence of n-octane/oxygen ratios

Elkhalifa

Friedrich

2016

Appl Petrochem Res

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Boron-and barium-doped vanadium-magnesium oxide catalysts (BVMgO and BaVMgO) were synthesized by the wet impregnation method and were used for the oxidative dehydrogenation of n-octane at different noctane/O 2 molar ratios. The catalysts were characterized by ICP-OES, in situ XRD, 51 V MAS NMR, SEM, EDX and TGA-DSC. The catalytic tests were carried out in a continuous flow fixed bed reactor. The incorporation of boron and barium as dopants into the VMgO system resulted in catalysts with some differences in properties, such as the details of phase transformations, porosity and degree of hydration. The catalytic performance was affected by the strength of the oxidative environment. Moreover, incorporation of barium enhanced the catalytic performance of VMgO, while the addition of boron adversely affected the performance of VMgO over all n-octane/O 2 molar ratios with regard to both activity and oxidative dehydrogenation selectivity.

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“…Among them, impregnation (dry or wet), ion exchange, co-precipitation, deposition via precipitation or vacuum vaporisation deserve particular attention [5][6][7]. When preparing catalysts with an active metal content higher than 10-20 wt%, preference is given to the precipitation method [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Metal-Support Interactions in Ni/ZSM-5 + Al2O3 Catalysts on the Transformation of n-Paraffins

2013

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NiO(8 %)/Ni,H-ZSM-5 ? Al 2 O 3 (1:1) catalysts differing in metal-support interactions, which influenced the metal-to-acid ratios, were examined. The interactions were changed by modifying the method of zeolite and aluminium hydroxide combining and the method of Ni incorporation. The catalysts were characterised by ICP, XRD, N 2 sorption, SEM, TEM, NH 3 -TPD, Py-IR, TPR, H 2 chemisorption and XPS. The effect of metal-support interactions was determined during n-C 6 conversion in a continuous system at H 2 :CH = 7:1 Nm 3 /m 3 , 0.1 MPa and LHSV = 1 h -1 . It was found that over the catalysts with weaker Ni-alumina interactions (n Ni_a /n, 3.2 9 10 -2 and 4.8 9 10 -2 ), selectivity to isomerisation products was by 10-35 % higher, and selectivity to high boiling hydrocarbons by 10-30 % lower than over the catalysts with stronger Ni-support interactions (n Ni_a /n, 1.2 9 10 -2 and 1.8 9 10 -2 ).

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Hydroconversion of C5–C8 alkanes over Zr-containing supported catalysts prepared by metal vapor method

Cited by 15 publications

References 28 publications

Physico-chemical and catalytic properties of Zr- and Cu–Zr ion-exchanged H-MCM-41

Physico-chemical and catalytic properties of Zr- and Cu–Zr ion-exchanged H-MCM-41

Dehydrocyclization of n-octane over boron- and barium-doped V-Mg-O catalysts: influence of n-octane/oxygen ratios

Effect of Metal-Support Interactions in Ni/ZSM-5 + Al2O3 Catalysts on the Transformation of n-Paraffins

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