Theoretical and experimental evaluation of mass transfer limitation in gas phase dehydration of glycerol to acrolein over supported HSiW catalyst

Talebian‐Kiakalaieh, Amin; Amin, Nor Aishah Saidina

doi:10.1016/j.jtice.2015.07.011

Cited by 12 publications

(4 citation statements)

References 36 publications

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“…Furthermore, some previous studies discuss the influence of transport phenomena involved in the glycerol dehydration reaction. [96][97][98] The studies are based on several tests via response surface methodology varying different reaction parameters such as glycerol feed, reaction temperature, carrier gas flow rate, catalyst mass, space velocity and mass transfer, which are represented through a response surface pointing to the best conditions to enhance the best conversion and selectivity.…”

Section: Structural Importance Of Oxides Used In Heterogeneous Cataly...mentioning

confidence: 99%

Catalytic Conversion of Glycerol to Acetol and Acrolein Using Metal Oxides: Surface Reactions, Prospects and Challenges

Barbosa

Braga

2022

ChemCatChem

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Glycerol dehydration to acetol and acrolein is an interesting reaction pathway for conversion of biomass‐derived products. However, they undergo extensive deactivation due to coke deposition and sintering, requiring the design of stable catalysts. The oxides stand out due to their natural abundance, simple synthesis, low cost and tunable acidic, basic and redox properties. The different studies apply these oxides as pure phase, supported, mixed or doped. However, it is observed that despite the large number of applied oxides in glycerol conversion, few works describe in detail about more complex oxides such as ferrites, hexaferrites, perovskites, among others. This review reports different acid oxides in the glycerol dehydration to acetol and acrolein as well as basic and redox oxides, describing a historical perspective, showing the most important theoretical foundations of heterogeneous catalysis to comprehend surface reactions and mentioning the different possibilities to understanding the different reactional pathway, highlighting the proposal mechanisms that explain the participation of the different active sites on the surface reactions. Furthermore, the sequence of reactions which show the origin of the coke deposited on catalyst surface was presented, emphasizing the main challenges. The role of the Lewis and Brønsted acid‐base sites present in the metal oxides and their interactions on glycerol dehydration were described, providing a direction to design catalysts for selective dehydration reactions resistant against coke deposition and sintering.

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Section: Structural Importance Of Oxides Used In Heterogeneous Cataly...mentioning

confidence: 99%

Catalytic Conversion of Glycerol to Acetol and Acrolein Using Metal Oxides: Surface Reactions, Prospects and Challenges

Barbosa

Braga

2022

ChemCatChem

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“…High Da-I values showed the potential to increase space velocity even at values higher than 140,000 NmL•g −1 •h −1 . This condition is necessary to ensure high reforming performances of the catalysts under investigation, while the influence of the external and internal mass transfer limitations was investigated by calculating the second Damköhler (Da-II) and the third Damköhler (Da-III) numbers, respectively [42,[71][72][73].…”

Section: Evaluation Of External and Internal Mass Transfer Limitationsmentioning

confidence: 99%

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

et al. 2018

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: The application of ceramic foams as structured catalyst supports is clearly expanding due to faster mass/heat transfer and higher contact efficiency than honeycomb monoliths and, mainly, packed beds. In this paper, alumina open-cell foams (OCFs) with different pore density (20, 30 and 40 ppi) were coated with Rh/CeO2 catalyst via a two steps synthesis method involving: (i) the solution combustion synthesis (SCS) to in-situ deposit the CeO2 carrier and (ii) the wet impregnation (WI) of the Rh active phase. The catalytic coatings were characterized in terms of morphology and adhesion properties by SEM/EDX analysis and ultrasounds test. Permeability and form coefficient were derived from pressure drop data. Catalytic performance was evaluated towards biogas Steam Reforming (SR) and Oxy-Steam Reforming (OSR) processes at atmospheric pressure by varying temperature (800–900 °C) and space velocity (35,000–140,000 NmL·g−1·h−1). Characteristics time analysis and dimensionless numbers were calculated to identify the controlling regime. Stability tests were performed for both SR and OSR over 200 h of time-on-stream (TOS) through consecutive start-up and shut-down cycles. As a result, homogenous, thin and high-resistance catalytic layers were in situ deposited on foam struts. All structured catalysts showed high activity, following the order 20 ppi < 30 ppi ≈ 40 ppi. External interphase (gas-solid) and external diffusion can be improved by reducing the pore diameter of the OCF structures. Anderson criterion revealed the absence of internal heat transfer resistances, as well as Damköhler and Weisz-Prater numbers excluded any internal mass transfer controlling regime, mainly due to thin coating thickness provided by the SCS method. Good stability was observed over 200 h of TOS for both SR and OSR processes.

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“…Therefore, to keep the retention time constant, Vcat must be varied. Consequently, if the glycerol conversion remains constant under different conditions, this shows that external diffusion did not limit the apparent reaction rate [59].…”

Section: External Diffusionmentioning

confidence: 91%

“…The gas mass feed flow rate (mg) and catalytic bed volume (Vcat) were also kept constant. Consequently, if the reaction conversion remains constant, this means that there is no internal diffusion to limit the reaction rate [59].…”

Section: Internal Diffusionmentioning

confidence: 99%

Coke-tolerant SiW20-Al/Zr10 catalyst for glycerol dehydration to acrolein

Talebian‐Kiakalaieh

Amin

2017

Chinese Journal of Catalysis

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Theoretical and experimental evaluation of mass transfer limitation in gas phase dehydration of glycerol to acrolein over supported HSiW catalyst

Cited by 12 publications

References 36 publications

Catalytic Conversion of Glycerol to Acetol and Acrolein Using Metal Oxides: Surface Reactions, Prospects and Challenges

Catalytic Conversion of Glycerol to Acetol and Acrolein Using Metal Oxides: Surface Reactions, Prospects and Challenges

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

Coke-tolerant SiW20-Al/Zr10 catalyst for glycerol dehydration to acrolein

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