Determination of different acid sites in Beta zeolite for anisole acylation with acetic anhydride

Wei, Huijuan; Liu, Kefeng; Xie, Sujuan; Xin, Wenjie; Li, Xiujie; Liu, Shenglin; Xu, Longya

doi:10.1016/j.jcat.2013.07.010

Cited by 37 publications

(10 citation statements)

References 37 publications

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“…A typical CLD‐TPD experiment was conducted by using the same thermogravimetric analysis instrument as IPA‐TPD, except CLD was used as the adsorbate. A larger basic molecule, TPP, was used to evaluate the acid sites on the external surface of BEA zeolite as suggested previously . 3DOm‐i BEA was first calcined at 823 K for 8 h in an air flow to remove the adsorbed impurities.…”

Section: Methodsmentioning

confidence: 99%

Effects of the Framework and Mesoporosity on the Catalytic Activity of Hierarchical Zeolite Catalysts in Benzyl Alcohol Conversion

Cho

Wang

et al. 2016

ChemCatChem

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The catalytic performance of three‐dimensionally ordered mesoporous imprinted (3DOm‐i) zeolite catalysts with different frameworks (3DOm‐i MFI, 3DOm‐i BEA, and 3DOm‐i LTA) were investigated by the liquid‐phase catalytic conversion of benzyl alcohol in mesitylene and compared to that of other microporous and mesoporous catalysts with a high external surface area, which included MCM‐22, 300 nm MFI, ITQ‐2, and Al‐MCM‐41. The mesoporosity in MFI and BEA zeolites can effectively enhance the catalytic performance of the zeolite catalysts for benzyl alcohol self‐etherification catalyzed by both the acid sites on the external and internal surface and the alkylation of mesitylene with benzyl alcohol catalyzed exclusively by the acid sites on the external surface. For 3DOm‐i LTA, MCM‐22, and Al‐MCM‐41, only the acid sites on the external surface can be utilized in the catalytic reactions. A distinct difference in the product selectivity was also observed for the microporous and mesoporous catalysts.

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Section: Methodsmentioning

confidence: 99%

Effects of the Framework and Mesoporosity on the Catalytic Activity of Hierarchical Zeolite Catalysts in Benzyl Alcohol Conversion

Cho

Wang

et al. 2016

ChemCatChem

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“…The Brønsted acid sites on the NB, AB and PdOAB materials were 2.89, 8.66 and 3.51 mmol g -1 , respectively, while Lewis acid sites were 4.08, 3.29 and 7.16 mmol g -1 , respectively. It was confirmed that the catalytic efficiency of AB is better than NB due to a high Brønsted acid sites, because the Friedel-Craft acylation required Brønsted acid sites for the formation of the acylium ion as the intermediate [15]. Even though, the Brønsted acid sites of the PdOAB decreased compared with AB catalyst, however, the catalytic activity was better.…”

Section: The Effect Of Catalyst Mass and Reaction Time Span Towards Tmentioning

confidence: 86%

“…From the SEM (Figure 2(f)) and XRD (Figure 3(c)) results, the tetragonal palladium oxide was located on the surface of the material, therefore increased the Lewis acid sites of the catalyst material. Many researchers reported that the catalyzed acylation reaction mechanism strongly depended on the acidity properties of the materials [15,35,37]. The AB material had higher Brønsted acid sites, therefore it showed a higher catalytic activity than the NB material and gave a higher yield toward Friedel-Craft acylation reaction.…”

Section: Hammet Analysis Of the Synthesis Of Acetophenone Reactionmentioning

confidence: 99%

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Preparation of PdO Doped on Bentonite as Catalyst for Friedel-Craft Acylation Reaction of Aromatic Compounds and the Investigation of the Reaction Mechanism

Kurniawan¹,

Imawan²,

Stansyah³

et al. 2018

Preprint

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Catalyst material plays a pivotal role in the pharmaceutical industry process. Among them, Friedel-Craft acylation reaction is a well-known reaction to synthesis acetophenone derivatives. However, Friedel-Craft acylation mostly used acetyl chloride as starting material with Lewis acid as homogeneous catalyst, which is nonenvironmental friendly process. In this work, a simple and efficient Friedel-Craft acylation reaction is reported by using the palladium oxide doped on activated bentonite (PdOAB) as the heterogeneous catalyst. The PdOAB catalyst material was characterized with scanning electron microscopy-energy dispersive X-ray (SEM-EDX), nitrogen isotherm adsorption, Fourier transform infrared (FTIR), X-ray powder diffraction (XRD), and thermogravimetric-differential thermal analysis (TG-DTA). The acetophenone derivatives with R = -H, -Cl, -CH3, -OCH3, -OH and -NH2 at para position were successfully synthesized from its corresponding aromatic compounds with glacial acetic acid in 86.6, 7.9, 91.7, 86.6, 82.7, and 78.9% yield, respectively. Therefore, a green method was established because the byproduct is water and the catalyst material can be recovered. Furthermore, the substituent (σ) constants were obtained by using Hammet equation, and the catalysis mechanism has been proposed.

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“…For 2,4-DMQ, as a bulky basic molecule, it can poison the acid sites irreversibly, and its molecule diameter is greater than the pore diameter of HZSM-5 catalyst. 11,12 Therefore, the external acid sites will be poisoned selectively when HZSM-5 catalyst is treated with 2,4-DMQ, whereas the internal acid sites will be kept intact. The molecular structure of 2,4-DMQ is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Reducing coke formation in the catalytic fast pyrolysis of bio-derived furan with surface modified HZSM-5 catalysts

et al. 2015

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In order to reduce coke yield during biomass catalytic fast pyrolysis process, MgO and 2,4-dimethylquinoline (2,4-DMQ) were selected to deposit the external acid sites of HZSM-5. Both MgO and 2,4-DMQ deposition could cause a reduction in total acid sites (both weak acid sites and strong acid sites) and external acid sites of HZSM-5.The modified catalysts were used for catalytic conversion of bio-derived furan. For MgO/HZSM-5 catalyst, the effects of deposited amount and deposited time were studied. The carbon yields of aromatics, C 2 -C 5 olefins, total chemicals, CO 2 and CO increased at first and then decreased slightly when deposited amount increased, while the carbon yield of coke decreased first and then increased gradually. Besides, with the deposited time increased, the carbon yields of petrochemicals, CO 2 and CO increased greatly, whereas that of coke decreased. For 2,4-DMQ/HZSM-5 catalyst, the effects of 2,4-DMQ treatment amount and treatment time were investigated. The experimental results illuminated that the increase in 2,4-DMQ treatment amount or treatment time could retard the generation of target products, CO 2 and CO but promote coke formation.

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Determination of different acid sites in Beta zeolite for anisole acylation with acetic anhydride

Cited by 37 publications

References 37 publications

Effects of the Framework and Mesoporosity on the Catalytic Activity of Hierarchical Zeolite Catalysts in Benzyl Alcohol Conversion

Effects of the Framework and Mesoporosity on the Catalytic Activity of Hierarchical Zeolite Catalysts in Benzyl Alcohol Conversion

Preparation of PdO Doped on Bentonite as Catalyst for Friedel-Craft Acylation Reaction of Aromatic Compounds and the Investigation of the Reaction Mechanism

Reducing coke formation in the catalytic fast pyrolysis of bio-derived furan with surface modified HZSM-5 catalysts

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