Kinetics of liquid‐phase hydrogenation of isooctenes on a Pd/γ‐alumina catalyst

Sarkar, A.; Seth, Deepyaman; Ng, Flora T. T.; Rempel, Garry L.

doi:10.1002/aic.10722

Cited by 12 publications

(7 citation statements)

References 21 publications

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“…Samples were withdrawn at regular time intervals and analyzed by GC to study the kinetics of the system. Although the reaction is clean and no side products have been reported in the literature, − we confirmed through independent experiments that TMPs alone, when heated in the presence of the catalyst under similar operating conditions but in the absence of hydrogen, do not form higher oligomers.…”

Section: Resultssupporting

confidence: 74%

“…2, 3 The terminal double bond in TMP-1 gets hydrogenated substantially more quickly than the internal double bond in TMP-2 (see Figure 1), 4,5 and therefore, the isomerization of TMP-2 to TMP-1 is essential to achieve higher rates and yields of hydrogenation. In prior work, the hydrogenations of isooctenes were carried out on Ni/Al 2 O 3 , 4 Co/SiO 2 , 5 and supported Pd catalyst; 6,7 however, these studies did not show any significant isomerization compared to hydrogenation.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Hydrogenation and Isomerization of Diisobutylenes over Pd-Doped Ion-Exchange Resin Catalyst

Talwalkar

Thotla

Sundmacher

et al. 2009

Ind. Eng. Chem. Res.

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The present work evaluates the applicability of a bifunctional ion-exchange-resin catalyst for the effective hydrogenation of diisobutylene, which is generally available as an equilibrium mixture of its isomers, mainly 2,4,4-trimethylpent-1-ene and 2,4,4-trimethylpent-2-ene. The terminal double bond in 2,4,4-trimethylpent-1ene gets hydrogenated substantially more quickly than the relatively stable internal double bond in 2,4,4trimethylpent-2-ene under relatively mild reaction conditions. Therefore, there is a need for a catalyst that is active for hydrogenation as well as simultaneous isomerization of 2,4,4-trimethylpent-2-ene to 2,4,4trimethylpent-1-ene under mild reaction conditions. The present catalyst was found to be capable of performing simultaneous hydrogenation and isomerization, thereby increasing the reaction rate. The effects of various operating parameters were studied, and a kinetic model is proposed to explain the observed reaction rates.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Simultaneous Hydrogenation and Isomerization of Diisobutylenes over Pd-Doped Ion-Exchange Resin Catalyst

Talwalkar

Thotla

Sundmacher

et al. 2009

Ind. Eng. Chem. Res.

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“…The solutions for the model equations were obtained using the method described in ref . The mass balance of each component in the liquid phase is coupled with the mass balance equation in the catalyst phase through the term N i at z = 0.…”

Section: Methodsmentioning

confidence: 99%

“…The reactor model used for analysis was similar to the model published previously for the liquid-phase hydrogenation of isooctene in a semibatch reactor. 44 A schematic of the reaction system used for the model development is shown in Figure 6.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Selective Oligomerization of Isobutene on Lewis Acid Catalyst: Kinetic Modeling

Sarkar

Seth

et al. 2014

Ind. Eng. Chem. Res.

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The kinetics of oligomerization of isobutene was studied on a NiSO4/γ-alumina catalyst in a stirred batch autoclave at temperatures of 50–90 °C and a pressure of 2170 kPa with different concentrations of isobutene. Experimental results revealed that the catalyst has high dimer selectivity and did not show any significant deactivation during the reaction. A generalized kinetic model based on a Langmuir–Hinshelwood (LH)-type reaction sequence was developed. The intraparticle diffusion effects inside the catalyst particle were correlated to the reaction rates and mass-transfer rate between the catalyst particle and liquid phase. The developed intrinsic kinetic model with estimated model parameters was found to describe the experimental data accurately. The magnitude of the activation energies was found to be in the range of 13–27 kJ mol–1, which suggests that the oligomerization reaction proceeds via surface rearrangement, as considered in the present LH-type kinetic model.

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“…However, kinetic data for liquid-phase hydrogenation are rare [4]. Moreover, most of the published liquid-phase kinetic measurements were carried out in the presence of a solvent [5][6][7][8]. The influence of solvent on the obtained kinetics is well documented in the literature [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Micro Kinetics of Hydrogenation in Liquid Phase Using Raman Spectroscopy

2016

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Hydrogenation of liquid organic hydrogen carriers is usually carried out in liquid phase. To measure the kinetics of this hydrogenation, an experimental setup using in situ Raman spectroscopy for analysis of the reaction mixture is proposed. With this setup it is possible to perform hydrogenation reactions at temperatures of up to 573 K and pressures up to 25 MPa. For validation of the experimental setup the hydrogenation of 1-octene was measured in liquid phase. The reaction progress can be monitored in detail by Raman spectroscopy. To determine kinetic parameters from the experimental data, two modeling approaches were applied: a classic kinetic model and a thermodynamic kinetic model. The results were compared to literature data.

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Kinetics of liquid‐phase hydrogenation of isooctenes on a Pd/γ‐alumina catalyst

Cited by 12 publications

References 21 publications

Simultaneous Hydrogenation and Isomerization of Diisobutylenes over Pd-Doped Ion-Exchange Resin Catalyst

Simultaneous Hydrogenation and Isomerization of Diisobutylenes over Pd-Doped Ion-Exchange Resin Catalyst

Selective Oligomerization of Isobutene on Lewis Acid Catalyst: Kinetic Modeling

Measurement of Micro Kinetics of Hydrogenation in Liquid Phase Using Raman Spectroscopy

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