Activity and selectivity for hydroisomerisation of n-decane over Ni impregnated Pd/H-mordenite catalysts

Karthikeyan, D.; Lingappan, N; Sivasankar, B.; Jabarathinam, Navamoney John

doi:10.1016/j.apcata.2008.03.035

Cited by 32 publications

(17 citation statements)

References 36 publications

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“…This result was also announced by Ho Si Thoang [12] and Villegas [15]. This may be because of the replacement of proton H + of silanol group of HZSM-5 by the metal [16], [17]. Pd/HZSM-5 possesses relatively higher total acidity and acid strength compared to Pt/HZSM-5.…”

Section: Eds Image Of Pd/hzsm-5 (Not Shown)supporting

confidence: 53%

Study the hydro-isomerization of light paraffin over bifunctional catalysts at elevated pressures

Dao¹,

Luu

2016

Sci. Tech. Dev. J.

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Noble metal based catalysts being 0.8 wt.%Pd and 0.35 wt.%Pt supported on HZSM-5 zeolite were subjected to the investigation. Physico-chemical characteristics of catalysts were determined by the methods of nitrogen physi-sorption, SEM, XRD, TEM, NH3-TPD, TPR, and Hydrogen Pulse Chemi-sorption (HPC). Activity of catalysts in the isomerization of n-C6 and n-C5 + n-C6 mixture was studied in a micro-flow reactor in the temperature range of 225 − 325 oC at pressure of 0.1 MPa and 0.7 MPa; the molar ratio H2/ hydrocarbon: 5.92, concentration of n-C5 or n-C6: 4.6 mol.%, GHSV 2698 h-1. The stability of catalysts was also determined. The obtained catalysts expressed high acid density, good reducing property, and high metal dispersion with the cluster size in the range of nanometer. They were an excellent contact for isomerization of n-hexane or n-C5 + n-C6 mixture with high conversion, selectivity, and yield. At optimal temperature, n-paraffin conversions were as high as 57 – 63 % and selectivity was 90 %. Pressure had the positive effect to the catalyst conversion, selectivity, and stability. At 0.7 MPa, both catalysts produced 66- 69 RON liquid product containing friendly environmental iso-paraffins which is superior blending stock for green gasoline.

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Section: Eds Image Of Pd/hzsm-5 (Not Shown)supporting

confidence: 53%

Study the hydro-isomerization of light paraffin over bifunctional catalysts at elevated pressures

Dao¹,

Luu

2016

Sci. Tech. Dev. J.

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“…The acidity of the catalysts was derived from the temperature-programmed desorption of NH 3 and expressed as the molar amount of NH 3 adsorbed per gram of catalyst (Table 2). It can be seen that the acidity of the monometallic Ni catalysts is lower than that of the support itself and is decreasing with the increase in the metal loading, which is related to the coverage of the acid sites of the support [56].…”

Section: Catalyst Characterizationmentioning

confidence: 96%

Ni-Pd/γ-Al2O3 Catalysts in the Hydrogenation of Levulinic Acid and Hydroxymethylfurfural towards Value Added Chemicals

et al. 2020

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γ-Al2O3 supported Ni-Pd catalysts with different Ni:Pd ratios were studied in the hydrogenation of two industrially-relevant platform molecules derived from biomass, namely levulinic acid and hydroxymethylfurfural. The bimetallic catalysts showed better performances in both processes in comparison to the monometallic counterparts, for which a too strong interaction with the alumina support reduced the activity. The behavior of the bimetallic catalysts was dependent on the Ni:Pd ratio, and interestingly also on the targeted hydrogenation reaction. The Pd-modified Ni-rich system behaves like pure Ni catalyst, but with a strongly boosted activity due to a higher number of Ni active sites available, Pd being considered as a spectator. This high activity was manifested in the levulinic acid hydrogenation with formic acid used as an internal hydrogen source. This behavior differs from the case of the Pd-rich system modified by Ni, which displayed a much higher Pd dispersion on the support compared to the monometallic Pd catalyst. The higher availability of the Pd active sites while maintaining a high surface acidity allows the catalyst to push the HMF hydrodeoxygenation reaction forward towards the green biopolymer precursor 2,5-bis(hydroxymethyl)-tetrahydrofuran, and in consequence to strongly modify the selectivity of the reaction. In that case, residual chlorine was proposed to play a significant role, while Ni was considered as a spectator.

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“…5) producing the final n-alkanes from the alkenes generated in intermediate steps. As Ni is known to have lower hydrogenating activity than noble metals such as Pt and Pd, Ni has been used primarily for hydroisomerization reactions [30], and mild hydrogenation, which do not require such high hydrogenation strength. Consequently, the present results are extremely promising, as Ni is a much less costly metal than Pt or Pd, a has a higher resistance to sulphur poisoning [31] and deactivation by other compounds that contain heteroatoms such as nitrogen [32].…”

Section: Catalytic Testing Resultsmentioning

confidence: 99%

High Performance Ni Based Catalyst for Toluene Hydrocracking

et al. 2009

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The one step hydrocracking of toluene to n-paraffins was successfully carried out using a Ni-based bifunctional catalyst supported on H-ZSM-5 zeolite. Two methods of catalyst preparation were compared and a quantifiable difference in selectivity was identified depending on the preparation method. Additionally, a high C 2? n-alkane selectivity of *75% was obtained with both catalysts, which is comparable to previous work using Pd. Both catalysts generated a toluene conversion of 100%.

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Activity and selectivity for hydroisomerisation of n-decane over Ni impregnated Pd/H-mordenite catalysts

Cited by 32 publications

References 36 publications

Study the hydro-isomerization of light paraffin over bifunctional catalysts at elevated pressures

Study the hydro-isomerization of light paraffin over bifunctional catalysts at elevated pressures

Ni-Pd/γ-Al2O3 Catalysts in the Hydrogenation of Levulinic Acid and Hydroxymethylfurfural towards Value Added Chemicals

High Performance Ni Based Catalyst for Toluene Hydrocracking

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