Zeolite Pore Entrance Effect on Shape Selectivity in Naphthalene Isopropylation

Brzozowski, R; Skupiński, Wincenty

doi:10.1006/jcat.2002.3702

Cited by 35 publications

(14 citation statements)

References 12 publications

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“…The main products were α,β-DIPN at lower temperatures; however, they were decreased with increasing the temperature accompanying concomitant increase in the formation of β,β-DIPN. The similar low selectivities for 2,6-and 2,7-DIPN can be found in previous papers over large pore zeolites such as FAU and BEA [21][22][23][24][25][26][27][28] and over ordered mesoporous metallosilicates [41][42][43][44][45].…”

Section: Isopropylation Of Np Over Mor [22/22]supporting

confidence: 82%

The isopropylation of naphthalene with propene over H-mordenite: The catalysis at the internal and external acid sites

Sugi

Anand

Subramaniam

et al. 2014

Journal of Molecular Catalysis A: Chemical

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Section: Isopropylation Of Np Over Mor [22/22]supporting

confidence: 82%

The isopropylation of naphthalene with propene over H-mordenite: The catalysis at the internal and external acid sites

Sugi

Anand

Subramaniam

et al. 2014

Journal of Molecular Catalysis A: Chemical

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“…The catalyses over MOR exclude the bulky transition states by steric interaction with the channels, resulting in predominant formation of the least bulky 2,6-DIPN. In contrast, the catalyses over zeolites such as H-Y zeolite (FAU) and H-Beta zeolite (BEA) [12][13][14][15][16][17][18][19][20], and mesoporous materials such as MCM-41, MCM-48, and SBA-1 [19,[21][22][23] with large pores and channels, were nonselective against 2,6-DIPN because their pores and channels are too large to exclude the bulky DIPN isomers. The catalyses over these zeolites and mesoporous materials occur under kinetic control and/or under thermodynamic control depending on the reaction conditions [2,16].…”

Section: Introductionmentioning

confidence: 88%

“…Steric restriction of the transition state of the products is an important factor in determining the products in these catalyses. Among the zeolites, H-mordenite (MOR) gives the highest selectivities for 2,6-diisopropylnaphalene (2,6-DIPN) [3][4][5][6][7][8][9][10][11][12][13][14]. The catalyses over MOR exclude the bulky transition states by steric interaction with the channels, resulting in predominant formation of the least bulky 2,6-DIPN.…”

Section: Introductionmentioning

confidence: 99%

Isopropylation of naphthalene over H-mordenite, H-Y, and H-beta zeolites: Roles of isopropylnaphthalene isomers

Sugi

Hasegawa

Tamada

et al. 2011

Korean J. Chem. Eng.

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Isopropylation of naphthalene (NP) was examined over H-mordenite (MOR), H-Y zeolite (FAU), and HBeta zeolite (BEA) in order to elucidate roles of isopropylnaphthalene (IPN) isomers during the catalysis. 2-IPN was the predominant isomer over MOR and works as a precursor for the selective formation of β,β-DIPN, particularly, 2,6-DIPN. In contrast, 1-IPN was predominant (with 2-IPN as a minor isomer) over FAU and BEA at low temperatures; dialkylation accompanied by the consumption of 1-and 2-IPN led to predominant formation of α,α-and α,β-DIPN. The formation of β,β-DIPN from 2-IPN was enhanced at higher temperatures. Bulky transition states of 1-IPN in IPN isomers and α,α-and α,β-DIPN among DIPN isomers were hindered by the interaction with MOR channels, resulting in the selective formation of β,β-DIPN, particularly 2,6-DIPN through the less bulky 2-IPN. FAU and BEA allow the formation of α,α-and α,β-DIPN from both of 1-and 2-IPN isomers because their channels are too large to exclude bulky transition states. The catalysis over FAU and BEA occurred under kinetic control at lower temperatures, and thermodynamic control also participates at higher temperatures.

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“…Values in parentheses in the names of catalyst samples denote the n Si /n Ga , n Si /n Al or n Si /n Fe ratios, respectively. More details on their properties can be found elsewhere [12,14,15].…”

Section: Methodsmentioning

confidence: 99%

Alkylation of Naphthalene Over Mesoporous Ga-SBA-1 Catalysts

Brzozowski

Vinu

2009

Top Catal

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Alkylation of naphthalene with propylene to diisopropylnaphthalenes (DIPN) for the use as a highquality solvent was carried out over Ga-SBA-1 mesoporous catalysts. The Ga-SBA-1 catalysts were very active in the alkylation even at 120°C and the activity increased with amount of Ga incorporated into the framework (n Si /n Ga ratio in the range of 17-140). Ga-SBA-1 catalysts showed a rather low isomerization activity and as a result low 2,6-DIPN selectivity. These two peculiarities of Ga-SBA-1 catalysts cause they are promising catalysts for DIPN solvent synthesis.

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Zeolite Pore Entrance Effect on Shape Selectivity in Naphthalene Isopropylation

Cited by 35 publications

References 12 publications

The isopropylation of naphthalene with propene over H-mordenite: The catalysis at the internal and external acid sites

The isopropylation of naphthalene with propene over H-mordenite: The catalysis at the internal and external acid sites

Isopropylation of naphthalene over H-mordenite, H-Y, and H-beta zeolites: Roles of isopropylnaphthalene isomers

Alkylation of Naphthalene Over Mesoporous Ga-SBA-1 Catalysts

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