Kinetic study of esterification over structured ZSM-5-coated catalysts based on fluid flow situations in macrocellular foam materials

Gao, Xin; Ding, Qiuyan; Wu, Yan; Jiao, Yilai; Zhang, Jinsong; Li, Xingang; Li, Hong

doi:10.1039/c9re00445a

Cited by 24 publications

(16 citation statements)

References 40 publications

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“…A circulating plug flow reactor with an inner diameter of 20 mm and a length of 370 mm was designed and set up, as shown in Figure 1, to conduct the experiments 31,32 . It is equipped with 7 sections of D = 20 mm, H = 50 mm structured ZSM-5@SiC catalyst as shown in Figure 1(d) (For details of ZSM-5@SiC, please refer to the work of Ding et al 31 ).…”

Section: Experimental Equipment and Processmentioning

confidence: 99%

Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM-5@SiC open-cell foam catalyst

Ping

Ding

Zou

et al. 2022

Preprint

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Chaotic flow inside porous media accelerates the transport, mixing, and reaction of molecules and particles in widespread natural and factitious processes. Current macroscopic models based on the average pore-scale variations show obvious limitations in the prediction of many chemical processes. In this paper, we reconstruct microscopic foam structures using Micro Computed Tomography to simulate fluid flow in structured ZSM-5@SiC foam catalyst. Moreover, we propose a conceptual model based on the microscopic mean square displacement theory to characterize the effective dispersion inside an open-cell foam. This model will explain the flow characteristics of confined fluid inside the porous media from fluid elements perspective. Particularly, dispersion factor and structure factor, as key parts of this model, perfectly interpret the driving characteristics of pressure drop, velocity different, and reaction in continuous foam media flow. This work also provides a unique means of predicting reaction kinetics of confined fluid in structured foam catalyst.

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Section: Experimental Equipment and Processmentioning

confidence: 99%

Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM-5@SiC open-cell foam catalyst

Ping

Ding

Zou

et al. 2022

Preprint

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“…More recently, Jiao's and Li's groups developed a structured catalyst taking advantage of a cylindrical SiC foam that they coated with ZSM-5 zeolite. 217 The authors investigated the activity of the as-prepared macroscopic catalytic system in the esterification of acetic acid with amyl alcohol and highlighted the primary role of the structured foam in controlling the kinetics of the process exhibiting a strong fluid flow characteristic dependence.…”

Section: Catalytic Applicationsmentioning

confidence: 99%

“…Moreover, they showed an excellent stability of their catalytic system throughout relatively long-term runs (up to 6 h) as well as the almost complete retaining of its pristine performance after 4 successive catalytic cycles. More recently, Jiao’s and Li’s groups developed a structured catalyst taking advantage of a cylindrical SiC foam that they coated with ZSM-5 zeolite . The authors investigated the activity of the as-prepared macroscopic catalytic system in the esterification of acetic acid with amyl alcohol and highlighted the primary role of the structured foam in controlling the kinetics of the process exhibiting a strong fluid flow characteristic dependence.…”

Section: Catalytic Applicationsmentioning

confidence: 99%

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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There is an obvious gap between efforts dedicated to the control of chemicophysical and morphological properties of catalyst active phases and the attention paid to the search of new materials to be employed as functional carriers in the upgrading of heterogeneous catalysts. Economic constraints and common habits in preparing heterogeneous catalysts have narrowed the selection of active-phase carriers to a handful of materials: oxide-based ceramics (e.g. Al2O3, SiO2, TiO2, and aluminosilicates–zeolites) and carbon. However, these carriers occasionally face chemicophysical constraints that limit their application in catalysis. For instance, oxides are easily corroded by acids or bases, and carbon is not resistant to oxidation. Therefore, these carriers cannot be recycled. Moreover, the poor thermal conductivity of metal oxide carriers often translates into permanent alterations of the catalyst active sites (i.e. metal active-phase sintering) that compromise the catalyst performance and its lifetime on run. Therefore, the development of new carriers for the design and synthesis of advanced functional catalytic materials and processes is an urgent priority for the heterogeneous catalysis of the future. Silicon carbide (SiC) is a non-oxide semiconductor with unique chemicophysical properties that make it highly attractive in several branches of catalysis. Accordingly, the past decade has witnessed a large increase of reports dedicated to the design of SiC-based catalysts, also in light of a steadily growing portfolio of porous SiC materials covering a wide range of well-controlled pore structure and surface properties. This review article provides a comprehensive overview on the synthesis and use of macro/mesoporous SiC materials in catalysis, stressing their unique features for the design of efficient, cost-effective, and easy to scale-up heterogeneous catalysts, outlining their success where other and more classical oxide-based supports failed. All applications of SiC in catalysis will be reviewed from the perspective of a given chemical reaction, highlighting all improvements rising from the use of SiC in terms of activity, selectivity, and process sustainability. We feel that the experienced viewpoint of SiC-based catalyst producers and end users (these authors) and their critical presentation of a comprehensive overview on the applications of SiC in catalysis will help the readership to create its own opinion on the central role of SiC for the future of heterogeneous catalysis.

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“…21 However, it is well-known that the reaction kinetics is affected by internal and external mass transfer resistances. 22 Therefore, the key challenge of the intrinsic kinetic model primarily depends on the reliability of experimental data in the absence of limitations of the mass-and heat-transfer regimes. 23 Due to the rate-limiting effects of the mass and heat transfer associated with standard thermogravimetric analysis (TGA) and xed bed reactors over the years, the Berty stationary basket catalyst reactor was investigated in this research.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic kinetic study of 1-butene isomerization over magnesium oxide catalyst via a Berty stationary catalyst basket reactor

et al. 2020

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Kinetic study of esterification over structured ZSM-5-coated catalysts based on fluid flow situations in macrocellular foam materials

Abstract: Kinetics on the structured catalysts exhibited strong dependency on a fluid flow characteristic (e.g., Re number). The results can guide the design of structured catalytic packing in the applications of the reaction distillation (RD) process.

Cited by 24 publications

References 40 publications

Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM-5@SiC open-cell foam catalyst

Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM-5@SiC open-cell foam catalyst

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

Intrinsic kinetic study of 1-butene isomerization over magnesium oxide catalyst via a Berty stationary catalyst basket reactor

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