Multiphase catalytic reactors: a perspective on current knowledge and future trends

Duduković, Milorad P.; Larachi, Faı̈çal; Mills, Patrick L.

doi:10.1081/cr-120001460

Cited by 318 publications

(200 citation statements)

References 458 publications

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“…For instance, the rate of carbon combustion was greatly enhanced in the liquid phase. Also, HPLC analysis of phenol CWAO samples detected up to 60 minor peaks [196] revealing a much more complex reaction mechanism than that proposed for the ODH of Ethylbenzene.…”

Section: Catalystmentioning

confidence: 99%

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Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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Section: Catalystmentioning

confidence: 99%

“…Four main categories of gas-liquid-solid catalytic reactors can be considered: mechanically agitated slurry CSTR reactor, SBC, FBR and finally fixed bed reactors [196]. A common characteristic of the former three reactor configurations is the substantially lower catalyst to liquid ratio compared to the fixed bed reactor.…”

Section: Reactor Type and Operationmentioning

confidence: 99%

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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“…Thus, we attempt to quantify the rates of events on the molecular scale, i.e., the kinetic rates of molecular interactions at prescribed temperature and composition conditions unhindered by transport effects, the micro intra-phase and interphase transport rates on the scale of a single catalyst particle or a single turbulent eddy, and reactor-scale phase contacting and flow pattern distributions and exchange rates in addition to heat transfer rates. Understanding these multi-scale transport kinetic interactions is the key to the selection of the best reactor type and operating conditions for a given chemistry and to successful scaleup of bench-scale demonstrations of novel molecular scale discoveries to commercial practice (Krishna and Sie, 1994;Dudukovic et al, 1995Dudukovic et al, , 2002Lerou and Ng, 1996). The level of implementation in industrial practice of CRE methodology in the past depended on the type of industry and production rates.…”

Section: Multiphase Reaction Engineeringmentioning

confidence: 99%

“…On the technical side further improvements in our ability to quantify kinetic transport interactions are needed, and this requires further advances in CRE methodology (Dudukovic et al, , 2002.…”

Section: Multiphase Reaction Engineeringmentioning

confidence: 99%

Challenges and Innovations in Reaction Engineering

Duduković

2008

Chemical Engineering Communications

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The importance of reaction engineering in generating a myriad of products on which developed societies depend is outlined. The challenges of a political, economic, and technical nature that need to be addressed in rendering conversion of raw materials into desired products that are more environmentally friendly and sustainable are briefly discussed. It is shown that multiphase reactors are prevalent in all applications, and improvements in the reactor material and energy efficiencies lead to more environmentally benign processes. This requires, in addition to the selection of green process chemistry, systematic implementation of the multi-scale reaction engineering methodology to accomplish proper reactor type selection and scaleup for commercial applications. It is also illustrated that recent innovations in multiphase reaction engineering basically utilize two key concepts: process intensification (e.g., enhancement in mass and heat transfer rates) and simultaneous reaction and separation. Examples of these are discussed, such as micro-reactors, reactive distillation, etc. It is also shown that commercialization of bench-scale discoveries requires either scaleup in parallel or vertical scaleup. New tools for visualization of opaque multiphase flows and development of appropriate rational phenomenological multiphase reactor models for scaleup and design are also briefly discussed.

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“…The diversity of catalytic hydrogenations and their complexity lead to a multitude of multiphase reactor designs summarized by Dudukovic et al in a recent review. 2 In three-phase reaction engineering, one of the main problems to overcome is avoiding internal and external mass-transfer limitations and to attain high selectivity. Therefore, catalyst particles of small diameter are required.…”

Section: Introductionmentioning

confidence: 99%

Solvent-Free Selective Hydrogenation of 2-Butyne-1,4-diol over Structured Palladium Catalyst

Kiwi‐Minsker

Joannet

Renken

2005

Ind. Eng. Chem. Res.

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Hydrogenation of 2-butyne-1,4-diol catalyzed by Pd nanoparticles on activated carbon fibers (ACFs) was studied. The ACF support in the form of woven fabrics provides the basis for structured catalytic fixed beds. In the present study, this catalyst was integrated in the stirrer of an autoclave. Hydrogenations were carried out in pure, solvent-free butynediol at temperatures from 352 to 392 K and hydrogen pressures of 1-2 MPa. The results were compared to those obtained for aqueous solutions at different pH's and temperatures of 293-333 K. High selectivities of g98% toward 2-butene-1,4-diol at conversions of e90% were attained in both systems. Turnover frequencies had comparable values at the same temperature. The activation energy of 30 kJ/mol was determined from initial reaction rates. Because this value is identical for the aqueous solution and the solvent-free system, mass-transfer limitations can be excluded for both systems. Concentration-time profiles were quantitatively predicted assuming the Langmuir-Hinshelwood kinetics with weak hydrogen adsorption. Estimated kinetic parameters allow a coherent interpretation of the experimental observations. Catalyst reactivation and multiple reuses were demonstrated.

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Multiphase catalytic reactors: a perspective on current knowledge and future trends

Cited by 318 publications

References 458 publications

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Challenges and Innovations in Reaction Engineering

Solvent-Free Selective Hydrogenation of 2-Butyne-1,4-diol over Structured Palladium Catalyst

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