Sustainable short-chain olefin production through simultaneous dehydration of mixtures of 1-butanol and ethanol over HZSM-5 and γ-Al2O3

Reviere, Arno de; Gunst, Dieter; Sabbe, Maarten; Verberckmoes, An

doi:10.1016/j.jiec.2020.05.022

Cited by 33 publications

(21 citation statements)

References 68 publications

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“…At higher conversion, the partial pressure of n-butanol decreases, allowing isomerization of the butenes, leading to a lower 1-butene selectivity. For n-HZSM-5 and c-HZSM-5, the selectivity toward 1-butene is identical and corresponds well with the literature [30,31,38].…”

Section: Selectivity Analysissupporting

confidence: 88%

“…The high surface coverage by dibutyl ether decreases the activity as the alternative reaction pathways (e.g., direct dehydration from n-butanol to 1-butene) are suppressed. In our previous work, we showed that dibutyl ether is the main product over γ-Al2O3 below conversions of 0.6 mol mol −1 [38]. This can implicate that if the γ-Al2O3 significantly contributes during the dehydration reaction and mainly forms dibutyl ether, the activity of the nano-HZSM-5 is lowered because of the poisoning by dibutyl ether.…”

Section: Activity Analysismentioning

confidence: 94%

“…To compare the activity of the catalysts, the n-butanol dehydration was performed at a single temperature of 513 K, as γ-Al2O3 and HZSM-5 display some activity for the dehydration of n-butanol at this temperature [38], see Figure 5. For the dehydration of n-butanol, the order of activity is c-HZSM-5 > n-HZSM-5 > Hybrid-50/50 > PM-50/50 >> γ-Al2O3.…”

Section: Activity Analysismentioning

confidence: 99%

“…Of all studied catalysts, only γ-Al 2 O 3 does not actively catalyze the isomerization of the butenes. In earlier work, it is reported that both the butenes and dibutyl ether (DBE) are primary products over HZSM-5, whilst for γ-Al 2 O 3 , only 1-butene and dibutyl ether are directly formed [31,38].…”

Section: Selectivity Analysismentioning

confidence: 99%

“…For the dehydration of bio-alcohols, HZSM-5 typically has a very high activity and selectivity to the corresponding olefins; however, the stability is poor due to coking [37]. Furthermore, beyond full conversion, secondary reactions are also catalyzed [38]. For γ-Al 2 O 3 , it is the opposite: It has a low activity, requiring higher temperatures; moreover, a high selectivity toward olefins also requires sufficiently high temperatures [32].…”

Section: Introductionmentioning

confidence: 99%

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Renewable Butene Production through Dehydration Reactions over Nano-HZSM-5/γ-Al2O3 Hybrid Catalysts

et al. 2020

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The development of new, improved zeolitic materials is of prime importance to progress heterogeneous catalysis and adsorption technologies. The zeolite HZSM-5 and metal oxide γ-Al2O3 are key materials for processing bio-alcohols, but both have some limitations, i.e., HZSM-5 has a high activity but low catalytic stability, and vice versa for γ-Al2O3. To combine their advantages and suppress their disadvantages, this study reports the synthesis, characterization, and catalytic results of a hybrid nano-HZSM-5/γ-Al2O3 catalyst for the dehydration of n-butanol to butenes. The hybrid catalyst is prepared by the in-situ hydrothermal synthesis of nano-HZSM-5 onto γ-Al2O3. This catalyst combines mesoporosity, related to the γ-Al2O3 support, and microporosity due to the nano-HZSM-5 crystals dispersed on the γ-Al2O3. HZSM-5 and γ-Al2O3 being in one hybrid catalyst leads to a different acid strength distribution and outperforms both single materials as it shows increased activity (compared to γ-Al2O3) and a high selectivity to olefins, even at low conversion and a higher stability (compared to HZSM-5). The hybrid catalyst also outperforms a physical mixture of nano-HZSM-5 and γ-Al2O3, indicating a truly synergistic effect in the hybrid catalyst.

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Section: Selectivity Analysissupporting

confidence: 88%

Section: Activity Analysismentioning

confidence: 94%

Section: Activity Analysismentioning

confidence: 99%

Section: Selectivity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Renewable Butene Production through Dehydration Reactions over Nano-HZSM-5/γ-Al2O3 Hybrid Catalysts

et al. 2020

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Influence of Acid‐Base Characteristics of Different Structural‐Type Zeolites (FER, MFI, FAU, BEA) on Their Activity and Selectivity in Isobutanol Dehydration

Zikrata,

Larina,

Balakin

et al. 2024

ChemCatChem

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The different structural‐type zeolites (FER, MFI, FAU, BEA) are investigated as catalysts in (bio)isobutanol conversion into linear butenes. The zeolites’ structure and morphology are confirmed by XRD, N2 (77 K) ad(de)sorption, SEM, EDX, XPS, and 27Al, 29Si, 1H MAS NMR, 1H‐29Si CP MAS NMR. The nature and strength of acid‐base sites are determined by FTIR spectroscopy of adsorbed pyridine, potentiometric titration, and TPD of NH3/CO2/H2O with MS control. The acid‐base properties of the zeolites' surfaces influence their catalytic properties in the target process. The higher selectivity towards linear butene isomers achieved over FER and MFI can be explained by the high strength and density of Brønsted acid sites (over 90% of the total surface acidity). MFI might be regarded as a potential material for the creation of novel catalysts for isobutanol conversion into linear butenes at moderate temperatures (448‐473 K) since it offers greater operating stability throughout the process.

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Synthesis of alumina/ferric oxide nanofibers and application to catalysts for ethanol dehydration reaction by adding palladium oxide

Masamura,

Hossain,

Nakane

2024

J. Korean Ceram. Soc.

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Alumina/ferric oxide (Al₂O₃/Fe₂O₃) composite nanofibers were fabricated via electrospinning followed by heat treatment. Structural characterization revealed mesoporous morphology with high porosity and surface area and uniform dispersion of catalytically active Fe₂O₃ nanoparticles. Catalytic evaluation for ethanol dehydration demonstrated superior performance for nanofibers containing 5 wt% Fe₂O₃, attributed to their unique structural features. Further enhancement was achieved by incorporating palladium oxide (PdO), resulting in improved catalytic activity, particularly in ethylene productivity. Surface acid properties were altered with PdO addition, suggesting a role of Lewis acid sites in augmenting catalytic performance. The developed PdO/Al₂O₃/Fe₂O₃ nanofibers exhibit stable performance over multiple cycles, offering promising prospects for efficient ethanol dehydration catalysts.

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Sustainable short-chain olefin production through simultaneous dehydration of mixtures of 1-butanol and ethanol over HZSM-5 and γ-Al2O3

Cited by 33 publications

References 68 publications

Renewable Butene Production through Dehydration Reactions over Nano-HZSM-5/γ-Al2O3 Hybrid Catalysts

Renewable Butene Production through Dehydration Reactions over Nano-HZSM-5/γ-Al2O3 Hybrid Catalysts

Influence of Acid‐Base Characteristics of Different Structural‐Type Zeolites (FER, MFI, FAU, BEA) on Their Activity and Selectivity in Isobutanol Dehydration

Synthesis of alumina/ferric oxide nanofibers and application to catalysts for ethanol dehydration reaction by adding palladium oxide

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