Hydroisomerization in liquid phase of a refinery naphtha stream over Pt–Ni/H-beta zeolite catalysts

Fúnez, Antonia; Lucas, Antonio de; Sánchez, Paula; Ramos, María Jesús; Valverde, J.L.

doi:10.1016/j.cej.2007.03.062

Cited by 40 publications

(18 citation statements)

References 35 publications

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“…in straight and sinusoidal channels, where the access for H 2 molecules should be difficult. All reduction peaks were obtained at lower temperatures than those observed by Funez et al [24]. This fact suggests that the metal in agglomerated form interacts weakly with the support.…”

Section: Catalysts Characterizationcontrasting

confidence: 42%

Bimetallic Zeolite Catalyst for CO2 Reforming of Methane

et al. 2009

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The catalytic activity of Ni-Rh on the synthesized BEA zeolite in carbon dioxide reforming of methane has been investigated. Catalysts were prepared using the incipient wetness impregnation method, with a total content of metals up to 5 wt%. Catalysts were characterized through XRD, TPR, N 2 adsorption, SEM, AAS, TG/DSC analyses. The prepared Ni-Rh zeolites were tested for their catalytic activity at 700°C, at atmospheric pressure, and at CH 4 /CO 2 ratio of 1. Catalytic results showed that bimetallic based zeolites exhibit high activity (CH 4 and CO 2 conversion equal to 73 and 78, respectively) but monometallic Rh catalysts were the only one stable against coke formation.

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Section: Catalysts Characterizationcontrasting

confidence: 42%

Bimetallic Zeolite Catalyst for CO2 Reforming of Methane

et al. 2009

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“…The conversion of n-heptane decreases slowly with the increase of m from 5 to 15, and meanwhile the selectivity to isomerized products increases gradually all the way with the increase of m. Because the influence of the Cr loading on the dispersion of Pt and the acidity of catalyst is negligible (see Figs. 1 and 3), the decrease of conversion at high Cr loading maybe associates with the decrease of surface area due to the introduction of too much Cr species, which could hinder the access of reactant to the acid sites [27]. The above results suggest a suitable molar ratio of Cr/Pt of 5 for the catalyst mCr0.4%Pt/Hb.…”

Section: Resultsmentioning

confidence: 89%

A Highly Efficient Hβ Zeolite Supported Pt Catalyst Promoted by Chromium for the Hydroisomerization of n-Heptane

et al. 2008

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Hb zeolite supported Pt catalysts promoted by Cr, La, Ce, Al or Zn were prepared by the co-impregnation method, and characterized by XRD, BET, NH 3 -TPD and H 2 -TPR. Their catalytic activities were evaluated in the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor. The Pt-bearing catalyst doped with Cr, La or Ce, especially Cr, is found to exhibit a much higher catalytic activity and isomerization selectivity than the catalyst without the dopant. At the low reaction temperature of 230°C, the catalyst with a Pt loading of 0.4% and a molar ratio of Cr to Pt of 5:1 shows a high conversion of nheptane of 77.1% coupled with a high selectivity to isomerization products of 94.4%. In contrast, over the counterpart catalyst without Cr, the conversion of n-heptane is 50.6% with a low selectivity to isomerization products of 82.4%. The substantial promotion effect of Cr is suggested to associate with the improved Pt dispersion, as well as the increased strong acid amount, due to the introducing of Cr into the catalyst.

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“…Two peaks at 340 and 514°C corresponding to the reduction of relatively big NiO particles and nickel species interacting with HL and not easy to be reduced, respectively, are observed in the TPR profile of NiO/HL. For the NiO/Hb sample, the peak at about 400°C can be due to the reduction of NiO particles with normal crystal size, whereas the peak at 556°C may be assigned to the reduction of nickel species located in the framework of Hb and hard to be reduced [15]. The NiO/HMCM-22 sample also shows two peaks at about 400 and 526°C corresponding to the reduction of NiO particles with normal size and nickel species interacting with HMCM-22 and not easy to be reduced, respectively.…”

Section: H 2 -Tprmentioning

confidence: 96%

Hydrodealkylation of C9 + Heavy Aromatics to BTX over Zeolite-Supported Nickel Oxide and Molybdenum Oxide Catalysts

Zhu

Dong

et al. 2009

Catal Lett

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Two series of catalysts with nickel oxide or molybdenum oxide as the active component and with different zeolites as supports were prepared by incipient wetness impregnation method, and their structural properties and acidity were characterized by means of XRD, H 2 -TPR, N 2 adsorption and desorption, FTIR spectrum of adsorbed pyridine and NH 3 -TPD. The catalytic activity of the prepared materials was investigated for the hydrodealkylation of commercial C 9? heavy aromatics to BTX. The results show that the catalytic performance is greatly influenced by the specific surface area, the acidity and the interaction between zeolite and metal oxide, and little affected by the pore diameter of catalysts. For NiO catalysts, the samples with the moderate interaction between zeolite and NiO exhibit the relatively high selectivity of BTX. And for MoO 3 catalysts, the presence of the molybdenum species associated with Brønsted acid site causes the remarkable reduction of selectivity. The presence of Brønsted acid sites, the growth of the strength of Lewis acid sites and the increase of acid amount and the specific surface area can all enhance the conversion of C 9 ? aromatics. Finally, compared with other zeolites, the HMCM-56 catalysts show the excellent overall catalytic performance with the yield of BTX more than 60 mol%, whether using NiO or MoO 3 as the active component.

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Hydroisomerization in liquid phase of a refinery naphtha stream over Pt–Ni/H-beta zeolite catalysts

Cited by 40 publications

References 35 publications

Bimetallic Zeolite Catalyst for CO2 Reforming of Methane

Bimetallic Zeolite Catalyst for CO2 Reforming of Methane

A Highly Efficient Hβ Zeolite Supported Pt Catalyst Promoted by Chromium for the Hydroisomerization of n-Heptane

Hydrodealkylation of C9 + Heavy Aromatics to BTX over Zeolite-Supported Nickel Oxide and Molybdenum Oxide Catalysts

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