Gas phase glycerol oxidative dehydration over bifunctional V/H-zeolite catalysts with different zeolite topologies

Silva, Thamyris Q.; Santos, Maurício B. dos; Santiago, Alex A.C.; Santana, Danilo O.; Cruz, Fernanda Tátia; Andrade, Heloysa Martins Carvalho; Mascarenhas, Artur J.S.

doi:10.1016/j.cattod.2016.08.011

Cited by 21 publications

(13 citation statements)

References 34 publications

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“…In a detailed study, several zeolites with different textural properties were impregnated with vanadium (5 wt.%) by using NH 4 VO 3 solutions [ 80 ]. The use of N 2 /O 2 as the carrier gas led to a negligible deactivation, except for those catalysts with a higher microporosity, or a higher SiO 2 /Al 2 O 3 molar ratio, which suffered a slight deactivation after 10 h of TOS.…”

Section: Mesoporous Silica-based Catalysts Used In the Glycerol Dementioning

confidence: 99%

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

et al. 2018

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Increasing worldwide biodiesel production has led to the generation of an important glycerol surplus, which needs to be valorized in order to improve the economic and environmental sustainability of the biodiesel industry. In this context, glycerol dehydration to acrolein by acid catalysis appears to be a potential route of glycerol valorization, since acrolein is an important intermediate for many chemical industries. The main drawback of this catalytic process is catalyst deactivation. Different alternatives have been proposed for overcoming it, such as the use of mesoporous materials in order to facilitate the diffusion of glycerol and reaction products, thus minimizing deactivation. This review compiles the main achievements of the use of mesoporous silica-containing materials that have been deployed either as a catalyst or for support in glycerol dehydration to acrolein. Thus, the effect of mesoporosity on both catalytic performance and deactivation will be discussed, as well as the blocking of pores by coke deposition.

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Section: Mesoporous Silica-based Catalysts Used In the Glycerol Dementioning

confidence: 99%

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

et al. 2018

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“…307,348,374,[391][392][393][394][395][396][397][398][399][400][401][402][403][404]409,410 With these V-containing catalysts, some reports evidenced that the mechanism was of Mars-van Krevelen type, and involved V 5+ reduction into V 4+ during the acrolein oxidation process, followed by reoxidation to the initial oxidation state by molecular oxygen present in the reactant feed. 307,391,393,394,397,398,401,403,410 Consequently, catalyst deactivation was related in some cases to a decrease of the V 5+ /V 4+ ratio, as observed by comparison of the spent catalyst with the where deactivation was associated with the total oxidation of V 4+ into V 5+ . 400 These oxidized centers were highly active but unselective toward acrylic acid, leading to major CO x formation.…”

Section: Chemical Reviewsmentioning

confidence: 99%

“…Acrylic acid can be obtained by the dehydration and oxidation (oxidehydration) of glycerol, which stands as a sustainable alternative to the petro-based process . This consecutive two-step process involving the dehydration of glycerol into acrolein ( 52 ), followed by the aerobic oxidation of 52 into acrylic acid, was studied in fixed-bed flow reactors over single bifunctional catalysts (Figure ), ,,,,− or in telescoped continuous systems comprising two different beds, packed with a dehydration and an oxidation catalyst (Figure ). ,,,, For bifunctional catalysts, vanadium or iron was the most common element used as a redox active site to mediate the oxidation of acrolein into acrylic acid.…”

Section: Upgrading Of Polyolsmentioning

confidence: 99%

Continuous Flow Upgrading of Selected C₂–C₆Platform Chemicals Derived from Biomass

et al. 2020

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The ever increasing industrial production of commodity and specialty chemicals inexorably depletes the finite primary fossil resources available on Earth. The forecast of population growth over the next 3 decades is a very strong incentive for the identification of alternative primary resources other than petro-based ones. In contrast with fossil resources, renewable biomass is a virtually inexhaustible reservoir of chemical building blocks. Shifting the current industrial paradigm from almost exclusively petro-based resources to alternative bio-based raw materials requires more than vibrant political messages; it requires a profound revision of the concepts and technologies on which industrial chemical processes rely. Only a small fraction of molecules extracted from biomass bears significant chemical and commercial potentials to be considered as ubiquitous chemical platforms upon which a new, bio-based industry can thrive. Owing to its inherent assets in terms of unique process experience, scalability, and reduced environmental footprint, flow chemistry arguably has a major role to play in this context. This review covers a selection of C2 to C6 bio-based chemical platforms with existing commercial markets including polyols (ethylene glycol, 1,2-propanediol, 1,3-propanediol, glycerol, 1,4-butanediol, xylitol, and sorbitol), furanoids (furfural and 5-hydroxymethylfurfural) and carboxylic acids (lactic acid, succinic acid, fumaric acid, malic acid, itaconic acid, and levulinic acid). The aim of this review is to illustrate the various aspects of upgrading bio-based platform molecules toward commodity or specialty chemicals using new process concepts that fall under the umbrella of continuous flow technology and that could change the future perspectives of biorefineries.

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“…The selectivity of acrylic acid was related to the ability of each topology of stabilizing the redox pair V 5+ /V 4+ . The best performances were observed for zeolite catalysts with MWW, BEA, and MFI topologies ( Silva et al, 2017 ). The main advantage of these catalysts was that they present similar acrylic acid selectivity operating under more drastic conditions than those employed for the catalysts based on mixed oxides, the main disadvantage is still the deactivation by coke.…”

Section: Catalytic Processes With Transition Metals On Zeolitesmentioning

confidence: 99%

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

et al. 2021

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This article reviews the current state and development of thermal catalytic processes using transition metals (TM) supported on zeolites (TM/Z), as well as the contribution of theoretical studies to understand the details of the catalytic processes. Structural features inherent to zeolites, and their corresponding properties such as ion exchange capacity, stable and very regular microporosity, the ability to create additional mesoporosity, as well as the potential chemical modification of their properties by isomorphic substitution of tetrahedral atoms in the crystal framework, make them unique catalyst carriers. New methods that modify zeolites, including sequential ion exchange, multiple isomorphic substitution, and the creation of hierarchically porous structures both during synthesis and in subsequent stages of post-synthetic processing, continue to be discovered. TM/Z catalysts can be applied to new processes such as CO2 capture/conversion, methane activation/conversion, selective catalytic NOx reduction (SCR-deNOx), catalytic depolymerization, biomass conversion and H2 production/storage.

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Gas phase glycerol oxidative dehydration over bifunctional V/H-zeolite catalysts with different zeolite topologies

Cited by 21 publications

References 34 publications

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

Continuous Flow Upgrading of Selected C₂–C₆Platform Chemicals Derived from Biomass

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

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Gas phase glycerol oxidative dehydration over bifunctional V/H-zeolite catalysts with different zeolite topologies

Cited by 21 publications

References 34 publications

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

Continuous Flow Upgrading of Selected C2–C6Platform Chemicals Derived from Biomass

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

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Continuous Flow Upgrading of Selected C₂–C₆Platform Chemicals Derived from Biomass