The effect of zeolite pore size and channel dimensionality on the selective acylation of naphthalene with acetic anhydride

Čejka, Jiřı́; Prokešová, Pavla; Červený, Libor; Mikulcová, Kateřina

doi:10.1016/s0167-2991(02)80082-9

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…At lower Si/Al ratios a rapid deactivation of zeolite Beta was observed, on the other hand, at Si/Al ratios higher than 60 the naphthalene conversion was very low owing to the lowest concentration of active sites available 22. The selectivity to the desired 2‐acetylnaphthalene was about 80 % over zeolite Beta with a Si/Al ratio of 37 61. No substantial change in selectivity to 2‐acylnaphthalene was observed for zeolite Beta differing in Si/Al ratio (Table 5).…”

Section: Acylation Of Naphthalene and 2‐methoxynaphthalenementioning

confidence: 99%

Acylation Reactions over Zeolites and Mesoporous Catalysts

2009

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Molecular sieves are highly active and selective catalysts with industrial potential for acylation reactions. Zeolites are the catalysts of choice when shape selectivity influences the preferential formation of some products, while high conversions are achieved over mesoporous catalysts with enhanced diffusion rates of reactants and products. In this Minireview, we focus on the understanding of the relationship among the structure of molecular sieve, type and concentration of acid sites and activity/selectivity in various acylations of aromatic and olefinic hydrocarbons. The products of these acylation reactions are important compounds for the pharmaceutical industry, fragrance and flavor materials, dyes, polymers, agrochemicals, and other applications.

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Section: Acylation Of Naphthalene and 2‐methoxynaphthalenementioning

confidence: 99%

Acylation Reactions over Zeolites and Mesoporous Catalysts

2009

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“…Various three-dimensional solid acid catalysts such as mesoporous silica, − heteropolyacids, , H-MFI, H-FAU, H-BEA, − and H-MOR , have been extensively examined for catalytic activity studies on acylation of anisole under various ranges of process parameters in the batch reactor. Among the solid acid catalysts mentioned above, zeolite beta (BEA) is considered as a prominent catalyst for the acylation of anisole because of its divertive strong acidity originating from a structural framework constituted by two polymorphs and interconnecting channels with a high concentration of structural defects, − which provides a higher level of anisole conversion, and also its pore topology oriented toward the regioselective formation of 4-MAP. − Synthesis of organic compounds over solid acid catalysts often suffers from rapid catalytic deactivation because of their strong interaction with oxygenated products, dealumination, and trapping of heavier molecular weight products in micropores/mesopores or on the intercrystalline surfaces because of their diffusion limitation. ,,,− A deactivated catalyst always needs to undergo catalyst regeneration, which triggers an increase in the process economics and yield loss and imposes technical complexities.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystallite Zeolite BEA for Regioselective and Continuous Acetyl Functionalization of Anisole Using Acetic Anhydride: Catalyst Deactivation Studies

Naresh,

Madhu Krushna,

Kondaiah

et al. 2023

ACS Omega

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Ultrasonic pretreatment of gel composition followed by hydrothermal synthesis produces the nanocrystallite zeolite beta (ZB) with crystal sizes of 10.3, 22.6, and 9.1 nm for ZB-1, ZB-2, and ZB-3, respectively. The effect of ultrasonic pretreatment and the (SiO2/Al2O3) ratio of gel composition on physical, textural properties, and also on the catalytic activity of ZB catalysts with increasing time on stream (TOS) was investigated. The specific surface area and mesopore volume for ZB-1, ZB-2, and ZB-3 are 438, 380, and 429 m2/g and 0.17, 0.05, and 0.14 cm3/g, respectively. The activity studies of ZB-1 and ZB-3 catalysts were confirmed that the anisole conversion initially increased with TOS until it attained the maximum value and then started decreasing further with TOS due to the deactivation of the catalyst caused by the strong interaction of the product with the acidic sites in the mesopore region. However, in the case of ZB-2, the anisole conversion (>45%) was sustained for a longer TOS due to its smaller particle size, low mesopore volume, and more acidic sites in the micropore volume that are inclusively made for retardation in the catlytic deactivation rate. The CHNS and TGA analysis of the spent catalysts confirm that ZB-1 and ZB-3 catalysts are susceptible for a significant coke formation attributed due to strong product retention in their large mesopore volume, which lead to the catalytic deactivation.

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Effect of the activation temperature on the catalytic activity of clinoptilolite for the benzoylation of biphenyl

Akgül

2011

Reac Kinet Mech Cat

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The effect of zeolite pore size and channel dimensionality on the selective acylation of naphthalene with acetic anhydride

Cited by 7 publications

References 7 publications

Acylation Reactions over Zeolites and Mesoporous Catalysts

Acylation Reactions over Zeolites and Mesoporous Catalysts

Nanocrystallite Zeolite BEA for Regioselective and Continuous Acetyl Functionalization of Anisole Using Acetic Anhydride: Catalyst Deactivation Studies

Effect of the activation temperature on the catalytic activity of clinoptilolite for the benzoylation of biphenyl

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