Modification of Fe species in FeNaY zeolite by NaCl treatment

Nováková, J.; Kubelková, Ludmila; Dolejšek, Z.; Wichterlová, Blanka; Kolihová, D.; Anděra, V.

doi:10.1007/bf02070624

Cited by 7 publications

(13 citation statements)

References 8 publications

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“…Above 250 "C lower oligomerization products of ethene could be observed. These results are in agreement with the literature [14,43,47,481. The TPR spectrum of diethyl ether was similar to that of ethanol (Fig.…”

supporting

confidence: 96%

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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supporting

confidence: 96%

Conversion of ethanol over zeolite H‐ZSM‐5

Schulz¹,

Bandermann²

1994

Chem Eng & Technol

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“…In MTH chemistry, an acetal typically symbolizes the presence of dimethoxymethane (DMM, CH 3 O-CH 2 -OCH 3 , an acetal of formaldehyde). 56,58,[73][74][75][76][77][78] Interestingly, methylene (-CH 2 -) in the post-MTH reacted unmodied zeolite ZSM-5 trapped DMM exhibits a twin signal (98.5 and 101.1 ppm), that shows an interchange of cross-peaks with each other. 21 This is a typical signature of exchange between two anomeric DMM structures (trans,trans and gauche,gauche, see Fig.…”

Section: Resultsmentioning

confidence: 99%

Surface enhanced dynamic nuclear polarization solid-state NMR spectroscopy sheds light on Brønsted–Lewis acid synergy during the zeolite catalyzed methanol-to-hydrocarbon process

et al. 2019

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“…The TPSR studies compliment the earlier NMR [9] and IR [4] spectroscopic studies. In contrast to these experiments which probe the reactants, intermediates and products in the adsorbed state, within the cavities and channels of the zeolite, the TPSR experiment probes these molecules as they exit from the zeolite channel [17].…”

Section: Introductionmentioning

confidence: 85%

Temperature Programmed Surface Reaction Studies of the Methanol to Gasoline (MTG) Conversion over ZSM‐5

Jayamurthy

Vasudevan

1995

Ber Bunsenges Phys Chem

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The~ethanol to gasoline conversion over ZSM-5 has been studied by the Temperature Programmed Surface Reaction (TP~R) technique. The technique is able to delineate the two steps in the process: the dehydration of methanol to dimethyl ether and the subsequent conversion of dimethyl ether to hydrocarbons. The activation barr~ers associated with each step was evaluated from the TPSR profiles and are 108 kJ/mol and 195 kJ/mol respectively, The methanol desorption profile shows considerable change with the amount of methanol molecules adsorbed per Bronsted site of the zeolite. The energy associated with the desorption process (CH OH) H + -ZSM-.-H 30H)n_t H -ZSM-5 + CH 30H, shows a spectrum of values depending on n. The spectrum is not connnuous and has a gap for n = 1. The trend is similar to that for the corresponding gas-phase reaction, (CH30H)nH+-(CH30H)n_IH+ +CH 30H. The present investigation highlights the importance of the prot~nated methanol cluster, (CH30H)nH + -ZSM-5, in the primary step of the MTG process, the formation of dimethyl ether. The reaction is compared with the corresponding gas phase ion-molecule reaction of CH 30H{ .

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Modification of Fe species in FeNaY zeolite by NaCl treatment

Cited by 7 publications

References 8 publications

Conversion of ethanol over zeolite H‐ZSM‐5

Conversion of ethanol over zeolite H‐ZSM‐5

Surface enhanced dynamic nuclear polarization solid-state NMR spectroscopy sheds light on Brønsted–Lewis acid synergy during the zeolite catalyzed methanol-to-hydrocarbon process

Temperature Programmed Surface Reaction Studies of the Methanol to Gasoline (MTG) Conversion over ZSM‐5

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