Catalytic performance of silicoaluminophosphate (SAPO) molecular sieves in the isopropylation of biphenyl

Bandyopadhyay, Mahuya; Bandyopadhyay, Rajib; Tawada, Shogo; Kubota, Yoshihiro; Sugi, Yoshihiro

doi:10.1016/s0926-860x(01)00738-4

Cited by 47 publications

(35 citation statements)

References 27 publications

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“…[245] Ceria thereby prevents non-regio-selective reaction on external surfaces with improvement of the selectivity. Similar results were observed over various SAPO for the isopropylation of biphenyl to produce 4,4'-diisopropylbiphenyl, [247] over H-ZSM-5 zeolite for the ethylation of ethylbenzene to 1,4-diethylbenzene [249] and over H-mordenite zeolite for the tert-butylation of toluene to 4-tert-butyltoluene. [250,251] Ce-Al-MCM-41-type mesoporous silicate materials was found to exhibit catalytic activities for isopropylation of naphthalene [252] and benzylation of toluene.…”

Section: Alkylation Of Aromatic Compoundssupporting

confidence: 73%

“…[244] Elsewhere, alkylation of aromatics compounds with alcohols or alkenes was performed over cerium modified microporous materials such as zeolites or silicoaluminophosphate (SAPO). [245][246][247][248][249][250][251] The impregnation of cerium leads to the deactivation of external acid sites of H-mordenite: the selectivity of 2,6-diisopropylnaphthalene in the isopropylation of naphthalene was enhanced without significant decrease of catalytic activity. [245] Ceria thereby prevents non-regio-selective reaction on external surfaces with improvement of the selectivity.…”

Section: Alkylation Of Aromatic Compoundsmentioning

confidence: 99%

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Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

362

244

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Ceria has been the subject of thorough investigations, mainly because of its use as an active component of catalytic converters for the treatment of exhaust gases. However, ceria‐based catalysts have also been developed for different applications in organic chemistry. The redox and acid–base properties of ceria, either alone or in the presence of transition metals, are important parameters that allow to activate complex organic molecules and to selectively orient their transformation. Pure ceria is used in several organic reactions, such as the dehydration of alcohols, the alkylation of aromatic compounds, ketone formation, and aldolization, and in redox reactions. Ceria‐supported metal catalysts allow the hydrogenation of many unsaturated compounds. They can also be used for coupling or ring‐opening reactions. Cerium atoms can be added as dopants to catalytic system or impregnated onto zeolites and mesoporous catalyst materials to improve their performances. This Review demonstrates that the exceptional surface (and sometimes bulk) properties of ceria make cerium‐based catalysts very effective for a broad range of organic reactions.

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Section: Alkylation Of Aromatic Compoundssupporting

confidence: 73%

Section: Alkylation Of Aromatic Compoundsmentioning

confidence: 99%

Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

362

244

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“…Similar level of the selectivities was observed in the other series of microporous materials, aluminophosphates (MAPO) and aluminosilicates with AFI and ATS topologies: 60-80% for SSZ-24, 34,35) SAPO-5, 22,27) and MAPO-5 (M: Mg, Ca, Sr, and Ba) 21) and 30-40% for MgAPO-36 19) and SSZ-55. 36) These results show that the shape-selective characters of these microporous materials are due to their topologies because pore structure of microporous materials was decided by the oxygen atom in the ring.…”

Section: 4supporting

confidence: 76%

“…Some one-dimensional molecular sieves with straight channel also enhanced the shape-selective isopropylation of BP. 20,21,27,[33][34][35] Here, the isopropylation of BP were examined over ZnAPO-5 and ZnAPO-36 in order to elucidate the shape-selective nature of pores of AFI and ATS topologies. Figure 14 shows effects of the temperature on the isopropylation of BP over ZnAPO-5 (Table 1, entry 5).…”

Section: 4mentioning

confidence: 99%

Zincoaluminophosphate Molecular Sieves with AFI and ATS Topologies: Synthesis by Dry-Gel Conversion Methods and Their Catalytic Properties in the Isopropylation of Biphenyl

et al. 2005

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Zincoaluminophosphates, ZnAPO-5 and ZnAPO-36 with AFI and ATS topologies, were successfully synthesized by dry-gel conversion (DGC) method: vapor-phase transport (VPT) and steam-assisted conversion (SAC) methods. ZnAPO-5 was synthesized successfully at 175 C by VPT and SAC methods using Et 3 N as structure directing agent (SDA). ZnAPO-36 was also obtained by VPT and SAC methods using Pr 3 N as SDA. The heating protocol was a key factor for the crystallization in the synthesis of ZnAPO-36: the best result was obtained by heating at 140 C for 1 d after aging of the gel at 105 C for 2 d. Calcination procedure is important to get microporous molecular sieves. ZnAPO-5 by VPT method calcined at 550 C gave clear XRD with high microporosity. Highly microporous ZnAPO-36 by VPT method was obtained by careful calcination. Characterization of these zincoaluminophosphates was performed by XRD, NH 3 -TPD, TG, SEM, N 2 adsorption, and ICP analysis. ZnAPO-5 and ZnAPO-36 have the Brønsted acidic characters by the substitution of a part of aluminum with zinc.The isopropylation of biphenyl (BP) over these molecular sieves gave different level of the selectivities for 4,4 0 -DIPB: 60-75% for ZnAPO-5 and 35-45% for ZnAPO-36: these selectivities are in the similar level to corresponding magnesioaluminophosphates corresponding magnesioaluminophosphates. These differences of in the selectivity are due to the pore structure: ZnAPO-5 has onedimensional straight channel; however, ZnAPO-36 has one-dimensional channel with side pocket. The steric restriction by ZnAPO-5 effectively controls the transition state to differentiate the slim isomers from others; however, pores of ZnAPO-36 cannot differentiate effectively the isomers because of their side pockets.

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“…According to the reference materials (Zhang et al, 2007;Chao et al, 2000;Bandyopadhyay et al, 2002), the physicochemical properties of the investigated molecular sieves are summarized in Table 1. The BET surface area and the pore volume of SAPO-11, SAPO-5 and Mordenite molecular sieves are determined by N2 adsorption-desorption measurement.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Synthesis of 2,6-Dimethylnaphthalene Over Sapo-11, Sapo-5 and Mordenite Molecular Sieves

Wang

Liu

Wei

et al. 2017

Braz. J. Chem. Eng.

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-Shape-selective methylation of naphthalene over SAPO-11, SAPO-5 and mordenite molecular sieves were carried out in a fixed-bed flow reactor under atmospheric pressure. Methanol and mesitylene were used as methylation and solvent agents. The experiment results showed that SAPO-11 exhibited higher stability, higher selectivity of 2,6-dimethylnaphthalene (2,6-DMN) and higher 2,6-/2,7-DMN ratio than SAPO-5 and mordenite molecular sieves. The catalytic performances for the methylation of naphthalene were mainly related to the pore structure of the catalysts. The comparison of the spent SAPO-11 with fresh SAPO-11 suggested that structure collapse of the SAPO-11 by dealumination was occurred during the methylation of naphthalene with methanol, which may have been caused by high temperature steam from water produced in the reaction or by high temperature methanol vapor.

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Catalytic performance of silicoaluminophosphate (SAPO) molecular sieves in the isopropylation of biphenyl

Cited by 47 publications

References 27 publications

Ceria‐Based Solid Catalysts for Organic Chemistry

Ceria‐Based Solid Catalysts for Organic Chemistry

Zincoaluminophosphate Molecular Sieves with AFI and ATS Topologies: Synthesis by Dry-Gel Conversion Methods and Their Catalytic Properties in the Isopropylation of Biphenyl

Synthesis of 2,6-Dimethylnaphthalene Over Sapo-11, Sapo-5 and Mordenite Molecular Sieves

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