Conversion of organic oxygen compounds and their mixtures on H‐ZSM‐5

Fuhse, Jürgen; Bandermann, Friedhelm

doi:10.1002/ceat.270100139

Cited by 29 publications

(44 citation statements)

References 14 publications

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“…Deactivation of catalysts was fastest with mixture B. That is not surprising since we could show in a previous paper [4] that oxygen containing organic compounds with C/H ratios higher than 0.625 have a great tendency for coking of a catalyst and the C/H ratio of acetaldehyde, present in high concentration in mixture B, is 1 after elimination of oxygen in the form of water. To prevent coking by acetaldehyde, it is possible to hydrogenate this compound in the gas phase during the conversion of syngas reaction mixtures over a H-ZSM-5 loaded with Ru.…”

Section: Conversion Of Syngas Reaction Products Over H-zsm-5mentioning

confidence: 66%

“…The conversion of reaction solutions of ethanol production from synthesis gas over H-ZSM-5 leads to a severe loss of activity of the catalyst by coking, when side products like acetaldehyde and acetic acid with an unfavourable C/H ratio [4] are present. This means that organic oxygen compounds with high C/H ratios have to be separated from reaction mixtures of syngas conversion to ethanol before they are sent to a second reactor for the further conversion of ethanol to olefins.…”

Section: Discussionmentioning

confidence: 99%

“…13 gives the product spectra after 30 min time on stream, as compared to a pure ethanol feed. While mixture A showed no difference from pure ethanol as feed, mixture B delivered a high yield of propene and mixture C a high yield of aromatics due to the presence of higher alcohols with favourable C/H ratios [4]. Mixture D yielded mainly ethene and aromatics.…”

Section: Conversion Of Syngas Reaction Products Over H-zsm-5mentioning

confidence: 98%

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Conversion of ethanol over zeolite H‐ZSM‐5

Schulz¹,

Bandermann²

1994

Chem Eng & Technol

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The conversion of ethanol over H-ZSM-5 was studied as a function of ethanol partial pressure, reaction temperature, weight hourly space velocity and %/A1 ratio. The results obtained were in qualitative agreement with most of those in the literature. Combination with all published results to give a significant regression model was not possible due to the large scatter of the data from various scientific groups. In mechanistic investigations, temperature programmed reaction measurements of ethanol, diethyl ether and ethene were performed. The formation of ethene from ethanol via direct elimination or from diethyl ether as intermediate could be confirmed. In the conversion of ethanol/water mixtures, the product distribution did not change significantly up to a water content of 60 wt%. Then, a pronounced increase of ethene formation and a considerable decrease of the yields of, aromatics was observed. When several reaction mixtures from syngas conversion to ethanol were converted over H-ZSM-5, the coking rate depended on the product distribution in the feed. Product mixtures from processes with higher amounts of compounds having an unfavourable C/H ratio led to rapid deactivation of the zeolite.

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Section: Conversion Of Syngas Reaction Products Over H-zsm-5mentioning

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Conversion Of Syngas Reaction Products Over H-zsm-5mentioning

confidence: 98%

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Conversion of ethanol over zeolite H‐ZSM‐5

Schulz¹,

Bandermann²

1994

Chem Eng & Technol

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“…The transformation of acetic acid into acetone on HZSM-5 zeolite takes place mainly by decarboxylation, but dehydration is less favoured and decarbonylation even less so. 21,27 The level of conversion of acetone at 673 K agrees with that corresponding to this oxygenate when it is fed diluted with water at 50% by volume. Figure 4 shows the scheme of reaction for the transformation of acetone.…”

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confidence: 67%

Undesired components in the transformation of biomass pyrolysis oil into hydrocarbons on an HZSM‐5 zeolite catalyst

Gayubo¹,

Aguayo²,

Atutxa³

et al. 2005

J of Chemical Tech & Biotech

149

101

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Abstract:The results of the catalytic transformation on HZSM-5 zeolite of mixtures of components of biomass pyrolysis oil in the 673-723 K temperature range are evidence of the need for previously separating certain components (aldehydes, oxyphenols and furfural) that undergo severe thermal degradation by forming carbonaceous deposits at the reactor inlet ducts and on the catalyst itself. The deactivation of the catalyst is a consequence of the deposition of two different types of coke: one of catalytic origin (similar to that generated in the transformation of methanol and bioethanol) and the other of thermal origin, which is produced by the aforementioned degradation. The remaining oxygenate components react to each other with synergistic effect, which means that their reactivity is higher than that of the pure components. The results show that the aqueous fraction of biomass pyrolysis oil may be transformed into hydrocarbons on acid catalysts similarly to the more familiar transformation of methanol and bioethanol.

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“…The compounds were easily converted to hydrocarbons when the carbon to hydrogen (C/H) ratio of the molecule fragment, remaining after eliminating oxygen as water, is less than 0.62. 19 Oxygenated compounds derived from biomass were also studied over zeolites. The catalytic transformation of bioethanol to ethene (BETE) and bioethanol to gasoline (BETG) has been studied because sugarcane and bioethanol production has increased since 1950, especially in Brazil and India.…”

Section: Introductionmentioning

confidence: 99%

Conversion of isopropanol and mixed alcohols to hydrocarbons using HZSM‐5 Catalyst in the MixAlco™ process

Taco-Vasquez

Holtzapple

2013

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com) HZSM-5 (SiO 2 /Al 2 O 3 5280 mol/mol) is used to produce hydrocarbons from reagent-grade isopropanol and mixed alcohols made from lignocellulosic biomass (waste office paper and chicken manure) using the MixAlco TM process. All studies were performed at 101 kPa (abs). The experiments were conducted in two sets: (1) vary temperature (300-T max C) at weight hourly space velocity (WHSV)51.31 h -1 , and (2) vary WHSV (0.5-11.5 h -1 ) at T5370 C. For isopropanol, T max 5450 C and for mixed alcohols T max 5520 C. For isopropanol, higher temperatures produced more gaseous products and more aromatics. High WHSV gives high concentration of C61 olefins, whereas low WHSV gives high concentrations of C9 aromatics. For mixed alcohols, changes in temperature affected the product distribution similar to isopropanol. In contrast, WHSV did not affect the concentration of reaction products; only dehydration products were observed.

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Conversion of organic oxygen compounds and their mixtures on H‐ZSM‐5

Cited by 29 publications

References 14 publications

Conversion of ethanol over zeolite H‐ZSM‐5

Conversion of ethanol over zeolite H‐ZSM‐5

Undesired components in the transformation of biomass pyrolysis oil into hydrocarbons on an HZSM‐5 zeolite catalyst

Conversion of isopropanol and mixed alcohols to hydrocarbons using HZSM‐5 Catalyst in the MixAlco™ process

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