Reactions on ZSM-5-type zeolite catalysts

Anderson, John R.

doi:10.1016/0021-9517(79)90250-1

Cited by 293 publications

(25 citation statements)

References 9 publications

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“…It is structurally identical with ZSMJ, which has been extensively used in industry as a catalyst for many types of reactions (Anderson et al, 1979;Young et al, 1982). The difference between the two solids lies in the absence of exchangeable cations in silicalite.…”

Section: Characterization Of the Adsorbents And Adsorbatesmentioning

confidence: 98%

Chromatographic study of alkanes in silicalite: Equilibrium properties

Hufton

Danner

1993

AIChE Journal

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Variations of perturbation chromatography were used to measure Henry's constants and equilibrium isotherms of various gases on silicalite. Three dgferent adsorbent samples were analyzed ( commercial powder and extruded pellets, and laboratory-synthesized crystals), and no discernable differences among the measured parameters were noted. Henry's constants for the linear alkanes were determined from isobaric and nonisobaric chromatography experiments. They were correlated successfully with temperature and the number of carbon atoms per adsorbate molecule. Isotherms were measured from concentration pulse or tracer/concentration pulse chromatography techniques. The Flory-Huggins version of the vacancy solution model was used to correlate pure gas isotherms and predict binary behavior successfully.

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Section: Characterization Of the Adsorbents And Adsorbatesmentioning

confidence: 98%

Chromatographic study of alkanes in silicalite: Equilibrium properties

Hufton

Danner

1993

AIChE Journal

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“…This zone is formed due to the presence of sodium ions, which act as compensation cations and ammonia adsorption sites. The NaZSM-5 zeolite typically forms a single shoulder of ammonia desorption (Anderson et al 1979;Topsøe et al 1981). Conversely, HZSM-5(60) zeolite shows the formation of two well-resolved shoulders of ammonia desorption that indicate the presence of two types of acid sites with different strengths.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Producing gasoline-like hydrocarbons by cracking crude soybean oil: tuning the NaZSM-5 zeolite’s acidity for increasing the catalyst lifetime

Ortiz-Bravo

Zandonai

Scaliante

et al. 2020

Braz. J. Chem. Eng.

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This work investigates the effect of NaZSM-5 zeolite's acid properties on the catalytic cracking of crude soybean to produce gasoline-like hydrocarbons. We modified both the acid concentration and the acid strength of the NaZSM-5(60) zeolite (where 60 denotes the SiO 2 /Al 2 O 3 molar ratio) either by varying the SiO 2 /Al 2 O 3 ratio (i.e., 30, and 90) or by exchanging the compensation cation (i.e., from Na + to H +). Given the ammonia temperature-programmed desorption and temperatureprogrammed oxidation tests, we observed that the acid strength of the catalyst is associated not only with the distribution of the cracking products, but also with the nature of the carbonaceous deposits formed during the reaction. Weak, medium, and strong acidity were associated with the formation of heavy hydrocarbon species, soft, and hard coke, respectively. The NaZSM-5 zeolites exhibited weak and medium acidity, while the HZSM-5(60) zeolite exhibited weak and strong acidity. Although both NaZSM-5(30) and HZSM-5(60) zeolites delivered higher gasoline yield than the NaZSM-5(60) zeolite due to its higher acid concentration, the HZSM-5(60) zeolite formed carbonaceous deposits with lower reactivity (i.e., hard coke). Therefore, low values of SiO 2 /Al 2 O 3 ratio in the NaZSM-5 zeolite drive the reaction products towards gasoline-like hydrocarbons and favor the catalyst reactivation through the formation of more reactive carbonaceous deposits.

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“…[1990] also show that in their studies the LTD peak and HTD peak of NHa fall between those of Py. Anderson et a/. [1979] reported that the desorption of M0-4 from ZSM-5 was extremely slow under reaction conditions at 450 °C.…”

Section: 3 the Effects Of Adsorption/evacuation Temperature And Evacmentioning

confidence: 99%

The characterization and elimination of the external acidity of ZSM-5

Weber

Fletcher

Möller

et al. 1996

Microporous Materials

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It has been a great pleasure to work with all the guys and girls in the group because of the ambience that exists in the group, allowing us to enjoy the student-life we love to live. Salutations to James and Miles, who were always willing to share their wisdom and experience, either academically or socially. Thanks to Klaus, for his invaluable suggestions when all else failed. Thanks to Connie, Leslie and Pam, without whom all the things we take for granted would never get done. Without the technical support of Tony Barker, Rob Senekal and Charlie Ledger, I would not have had the equipment which by now has become one of my closest friends and greatest enemies. A special thanks to my parents, Ton and Ank, for their unassuming belief in me, and to Marc and Marjolijn, who've had to put up with me for over two decades.

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Reactions on ZSM-5-type zeolite catalysts

Cited by 293 publications

References 9 publications

Chromatographic study of alkanes in silicalite: Equilibrium properties

Chromatographic study of alkanes in silicalite: Equilibrium properties

Producing gasoline-like hydrocarbons by cracking crude soybean oil: tuning the NaZSM-5 zeolite’s acidity for increasing the catalyst lifetime

The characterization and elimination of the external acidity of ZSM-5

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