Kinetics of the solvent-free hydrogenation of 2-methyl-3-butyn-2-ol over a structured Pd-based catalyst

Crespo‐Quesada, Micaela; Grasemann, Martin; Semagina, Natalia; Renken, Albert; Kiwi‐Minsker, Lioubov

doi:10.1016/j.cattod.2008.09.035

Cited by 65 publications

(80 citation statements)

References 30 publications

(60 reference statements)

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“…The increased selectivity by 1-2% in the diluted solutions when compared solvent-free operation agrees with the previous literature data [41,48]. The likely reason is that the increasing absolute concentrations of MBE that was formed under solvent-free conditions result in higher MBE adsorption on the catalyst surface and a higher rate of subsequent hydrogenation into MBA.…”

Section: Effect Of Liquid Flow Ratessupporting

confidence: 90%

“…The observed selectivity is notably higher than the one observed over the Pd catalysts supported on conventional supports, such as TiO2 or SiO2, where the selectivity reaches around 92% at a low conversion [24,49]. These data are in excellent agreement with the previous studies over Pd/ZnO catalysts [41,48] and are comparable to the best examples of MBY semihydrogenation reported in literature over more complex metal-poisoned bimetallic catalysts which show selectivity of in the range of 97-98% [28,32,36,[50][51][52].…”

Section: Effect Of Liquid Flow Ratessupporting

confidence: 89%

“…Also, a direct step of MBY to MBA hydrogenation is considered feasible, although the product distribution can often be accurately described when considering only the former two stages [25,28,44]. The formation of the C10 dimers is also a possible step, but selectivity towards dimers is generally below 0.1% [48]. Because of the low dimer quantities and the difficulty in identification, we did not perform the corresponding analyses.…”

Section: Effect Of Liquid Flow Ratesmentioning

confidence: 99%

“…The MBE selectivity decreased at a higher reaction pressure from 98% to below 92%. The observed phenomena can be explained considering the first order hydrogenation rates to hydrogen, as presented in Equation (1) [48,52,57,58],…”

Section: Effect Of Liquid Flow Ratesmentioning

confidence: 99%

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Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

2017

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Semihydrogenation of 2-methyl-3-butyn-2-ol (MBY) was studied in a 5 m tube reactor wall-coated with a 5 wt % Pd/ZnO catalyst. The system allowed for the excellent selectivity towards the intermediate alkene of 97.8 ± 0.2% at an ambient H 2 pressure and a MBY conversion below 90%. The maximum alkene yield reached 94.6% under solvent-free conditions and 96.0% in a 30 vol % MBY aqueous solution. The reactor stability was studied for 80 h on stream with a deactivation rate of only 0.07% per hour. Such a low deactivation rate provides a continuous operation of one month with only a two-fold decrease in catalyst activity and a metal leaching below 1 parts per billion (ppb). The excellent turn-over numbers (TON) of above 10 5 illustrates a very efficient utilisation of the noble metal inside catalyst-coated tube reactors. When compared to batch operation at 70 • C, the reaction rate in flow reactor can be increased by eight times at a higher reaction temperature, keeping the same product decomposition of about 1% in both cases.

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Section: Effect Of Liquid Flow Ratessupporting

confidence: 90%

Section: Effect Of Liquid Flow Ratessupporting

confidence: 89%

Section: Effect Of Liquid Flow Ratesmentioning

confidence: 99%

Section: Effect Of Liquid Flow Ratesmentioning

confidence: 99%

See 2 more Smart Citations

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

2017

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“…8). However, an increase in the hydrogenation reaction rate by a factor of 2.5 would be expected at 335 K as compared with 310 K, 54,55 which should lead to much higher conversion at a given liquid flow rate. This fact can be explained by a substantial decrease in the hydrogen partial pressure due to solvent evaporation and its diffusion to the gas phase (Fig.…”

Section: Semihydrogenation In the Capillary Reactormentioning

confidence: 99%

Novel synthesis of thick wall coatings of titania supported Bi poisoned Pd catalysts and application in selective hydrogenation of acetylene alcohols in capillary microreactors

2015

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Development of Novel Multiphase Microreactors: Recent Developments and Future Challenges

Rebrov

2019

Handbook of Green Chemistry

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Nowadays, one of the major challenges for the chemical industry is the development of innovative processes with less by‐product formation, improved product yields, and high‐energy efficiency. Microreactor technology provides unique solutions to meet these requirements. As an important means for process intensification, microchemical technology is expected to have a number of advantages for chemicals production. The high heat‐ and mass‐transfer rates in microreactors enable many highly exothermic, fast reactions to be operated under nearly isothermal conditions, thereby better selectivity or yield can be reached as compared to conventional reactors.This chapter is a summary of recent developments in microreactor technology for gas–liquid catalytic reactions that constitute up to 20% of all reactions used in fine chemicals industry. The fundamentals of design and operation of microreactors are explained. Various design concepts are discussed and key features are illustrated, and examples of successful applications are given.

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Kinetics of the solvent-free hydrogenation of 2-methyl-3-butyn-2-ol over a structured Pd-based catalyst

Cited by 65 publications

References 30 publications

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

Novel synthesis of thick wall coatings of titania supported Bi poisoned Pd catalysts and application in selective hydrogenation of acetylene alcohols in capillary microreactors

Development of Novel Multiphase Microreactors: Recent Developments and Future Challenges

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