Influence of binder on the acidity and performance of H-Gallosilicate (MFI) zeolite in propane aromatization

Choudhary, Vasant R.; Devadas, P.; Kinage, Anil K.; Guisnet, M.

doi:10.1016/s0926-860x(97)00100-2

Cited by 66 publications

(44 citation statements)

References 25 publications

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“…Due to the small amount of catalyst there is some uncertainty in the measurements but the results show highest coke formation over HZSM-5/Al 2 O 3 and lowest over HZSM-5/clay. The higher coke formation with HZSM-5/Al 2 O 3 is consistent with several studies reporting high coke yields with alumina [30,31] and also with higher coking rate for gallosilicates with alumina binder than with kaolin or silica binder [22,26]. Acid sites in general promote coke formation.…”

Section: Hzsm-5/al2o3supporting

confidence: 90%

“…The low hydrocarbon yields, deoxygenation, and high coke formation are in accordance with several studies on alumina as a catalyst for pyrolysis vapor upgrading [26][27][28][29][30][31] and also on the impact of alumina binder on methanol-to-gasoline over HZSM- [52] [3] and on propane aromatization over HZSM-5-type gallosilicates [22]. However, the low yields with alumina binder are in contrast to the results of Zhang et al [33] who found physical mixtures of HZSM-5 and 10 % alumina to increase aromatic formation.…”

Section: Hzsm-5/al2o3supporting

confidence: 88%

“…The binders may modify catalyst porosity, acid site characteristics, thermal properties, and catalyst coking characteristics. Binders may reduce catalyst deactivation by coke by trapping coke precursors but they may also increase coke formation [22]. Several studies have reported the impact of binders on HZSM-5 [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Among silica, alumina, and kaolin as binders for Ni/HZSM-5, alumina gave the highest acidity and largest mesopore volume, which translated into highest cyclopentenone hydrodeoxygenation [25]. Choudhary et al [22] compared the impact of kaolin and alumina as binders for H-gallosilicate, a zeolite with HZSM-5 structure. Kaolin decreased both the intracrystalline (inside zeolite crystals) and intercrystalline (on the exterior surface of the crystals) acidity whereas alumina had little impact on the intracrystalline acidity but increased the intercrystalline acidity.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Pyrolysis of Pine Over HZSM-5 with Different Binders

et al. 2015

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Three HZSM-5 catalysts with different binders (alumina, silica, and clay) were evaluated for upgrading of pine pyrolysis vapors. All catalysts were based on the same HZSM-5 with silica to alumina molar ratio of 30. Experiments in micro-scale analytical Py-GCMS/FID showed that fresh catalysts with silica and clay produced predominantly aromatic hydrocarbons at similar carbon yields. The catalyst with alumina gave lower vapor yields and produced both hydrocarbons and partially deoxygenated products, in particular furans. The catalyst with alumina also gave higher coke yields and exhibited faster deactivation than the catalysts with clay and silica binders. The low hydrocarbon yields and coke formation were attributed to the acidic sites provided by alumina and blocking of the zeolite sites. The catalysts with silica and clay as binders were further tested in a 2-inch fluidized bed system for ex situ catalytic pyrolysis of pine. Similar oils were produced over both catalysts with carbon yields of approximately 23 % and oxygen contents of 20-21 %.

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Section: Hzsm-5/al2o3supporting

confidence: 90%

Section: Hzsm-5/al2o3supporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Catalytic Pyrolysis of Pine Over HZSM-5 with Different Binders

et al. 2015

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“…However, binders can affect the physicochemical properties of catalyst and these changes can have a strong influence on the catalytic activity and selectivity [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Catalyst Binders on the Acidity and Catalytic Performance of HZSM-5 Zeolites for Methanol-to-Propylene (MTP) Process: Single and Binary Binder System

Lee

Ihm

2009

Top Catal

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The effect of the binders, such as silica, alumina, and aluminum phosphate solution (APS), was studied on the acidity and catalytic performance of HZSM-5 zeolite (SiO 2 /Al 2 O 3 = 80) in methanol-to-propylene (MTP) process. The strong acidity of catalyst increased slightly with alumina binder but decreased with silica and APS binders. It is noted that the catalyst with APS binder showed the highest bulk crush strength. Catalytic performance of the alumina or silica bound catalyst was comparable to that of pure HZSM-5 catalyst while that of APS bound catalyst was completely different depending on the binder content. Low content (10 wt%) of APS resulted in a dramatically enhanced propylene selectivity ([40 C mol%) due to the decrease in strong acidity. On the other hand with high content ([20 wt%) of APS, methanol was mostly dehydrated into dimethylether without further transformation into hydrocarbons even if the mechanical strength was significantly improved. The binary binder system was proposed not only to improve the mechanical strength of catalyst with small amount of APS binder but also to keep a high propylene selectivity. The catalyst bound with APS-and-alumina or APS-and-silica showed a comparable propylene selectivity to that of HZSM-5 with the 10 wt% of APS single binder while demonstrated much higher bulk crush strengths.

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Aromatization of Light Alkanes

O’Connor

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Thermodynamics of Alkane Aromatization Catalysts Ga / HZSM ‐5 Pt / KL Other Catalysts for Alkane Aromatization Aromatization of Alkanes in the Range C 3  C 8 Aromatization of Propane Aromatization of Ethane Aromatization of Butane Aromatization of Hexane Aromatization of Pentanes, Heptanes and Octanes Commercial Applications of Aromatization of Light Alkanes Conclusion

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Influence of binder on the acidity and performance of H-Gallosilicate (MFI) zeolite in propane aromatization

Cited by 66 publications

References 25 publications

Catalytic Pyrolysis of Pine Over HZSM-5 with Different Binders

Catalytic Pyrolysis of Pine Over HZSM-5 with Different Binders

Influence of Catalyst Binders on the Acidity and Catalytic Performance of HZSM-5 Zeolites for Methanol-to-Propylene (MTP) Process: Single and Binary Binder System

Aromatization of Light Alkanes

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