Nitridation of BaO supported on mesoporous materials: Basicity characterization and catalytic properties

Wu, Guangjun; Jiang, Shaoliang; Li, Landong; Guan, Naijia

doi:10.1016/j.apcata.2010.07.033

Cited by 26 publications

(13 citation statements)

References 50 publications

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“…The basic species vary from single-to multi-component metal oxides. 159,189 As a result, a series of mesoporous solid bases were fabricated by post-synthetic modification. 188 Besides, alkaline earth metal oxides-modified mesoporous silica were further subjected to nitridation to tailor the surface properties of solid bases.…”

Section: Post-synthetic Modificationmentioning

confidence: 99%

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Design and fabrication of mesoporous heterogeneous basic catalysts

2015

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Mesoporous solid bases are extremely desirable in green catalytic processes, due to their advantages of accelerated mass transport, negligible corrosion, and easy separation. Great progress has been made in mesoporous solid bases in the last decade. In addition to their wide applications in the catalytic synthesis of organics and fine chemicals, mesoporous solid bases have also been used in the field of energy and environmental catalysis. Development of mesoporous solid bases is therefore of significant importance from both academic and practical points of view. In this review, we provide an overview of the recent advances in mesoporous solid bases, which is basically grouped by the support type and each category is illustrated with typical examples. Cooperative catalysts derived from the incorporation of additional functionalities (i.e. acid and metal) into mesoporous solid bases are also included. The fundamental principles of how to design and fabricate basic materials with mesostructure are highlighted. The mechanism of the formation of basic sites in different mesoporous systems is discussed as well.

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Section: Post-synthetic Modificationmentioning

confidence: 99%

“…189 Furthermore, the abundant hydroxyl groups on the surface of mesoporous silica will bring many by-products in base-catalyzed reactions. However, the base strength of these materials may decrease due to the interaction of basic oxides with siliceous supports as reported by Guan's group.…”

Section: Post-synthetic Modificationmentioning

confidence: 99%

Design and fabrication of mesoporous heterogeneous basic catalysts

2015

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“…This suggests that the amine-terminated CDs with stronger basicity exhibited higher catalytic activities in Knoevenagel reactions. [21] To extend the substrate scope,several benzaldehyde derivatives were used to react with malononitrile under the same conditions.E xcept 4-fluorobenzaldehyde,m edium (71.5 %) to excellent (95.0 %) yields were obtained (Supporting Information, Table S2, entries [1][2][3][4][5][6]. Compared to other carbon nanomaterials, [22] the amineterminated CDs exhibited superior catalytic activities for the Knoevenagel reaction.…”

Section: Angewandte Chemiementioning

confidence: 99%

“…After recycling six times,its yield still reached to 93.7 %(Supporting Information, Figure S30). [21] To extend the substrate scope,several benzaldehyde derivatives were used to react with malononitrile under the same conditions.E xcept 4-fluorobenzaldehyde,m edium (71.5 %) to excellent (95.0 %) yields were obtained (Supporting Information, Table S2, entries 1-6 and 8, and Figures S31-S36). This suggests that the amine-terminated CDs with stronger basicity exhibited higher catalytic activities in Knoevenagel reactions.…”

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confidence: 99%

Reversible Phase Transfer of Carbon Dots between an Organic Phase and Aqueous Solution Triggered by CO₂

et al. 2018

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Carbon dots (CDs) have attracted increasing attention in applications such as bio-imaging,sensors,catalysis, and drug delivery.H owever,u nlike metallic and semiconductor nanoparticles,the transfer of CDs between polar and nonpolar phases is little understood. Ac lass of amine-terminated CDs is developed and their phase transfer behavior has been investigated. It is found that these CDs can reversibly transfer between aqueous and organic solvents by alternatively bubbling and removing CO 2 at atmospheric pressure.T he mechanism of such CO 2 -switched phase transfer involves reversible acid-base reaction of amine-terminated CDs with CO 2 and the reversible formation of hydrophilic ammonium salts.Byusing the CDs as catalysts,the phase transfer is applied in the Knoevenagel reaction for efficient homogeneous reaction, heterogeneous separation, and recycling of the catalysts.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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“…Neutralization and disposal of these acidic aqueous wastes environmentally and economically is very challenging. Replacement of sulphuric acid by solid acid catalysts is considered to be the most effective way to overcome the above problems of the mixed‐acid process . The present work is concerned with the selective synthesis of mononitrotoluenes with eco‐friendly solid acid catalysts.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of solid acids catalysed nitration of toluene: Change in selectivity by triphase (liquid–liquid–solid) catalysis

Jeeru

Pradhan

Kundu³

et al. 2017

Asia-Pacific J Chem Eng

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Nitrotoluenes are precursors to a variety of commercially important products such as dyes, pharmaceuticals, and plastics. The protonated form of Y, ZSM-5, and mordenite zeolites as well as strongly acidic cation exchange resin (Amberlite IR-120) were examined as triphase catalyst (liquid-liquid-solid) for the nitration of toluene to produce mainly mononitrotoluenes. Among the solid acid catalysts tested, zeolites were found to be more active than cation exchange resin with highest activity for H-mordenite followed by HZSM-5 and HY zeolites. The reaction was found to be free from external diffusional resistance. The effects of other parameters (temperature, catalyst loading, and nitric acid concentration) on the rate of toluene nitration over H-mordenite catalyst were also investigated. The selectivity for p-nitrotoluene increases with temperature but decreases with increase in nitric acid concentration. The acidity level of the catalyst determines the product distribution; the stronger the acidity, the lower the ortho/para ratio is in the product mixture. The triphasic nitration reaction is kinetically controlled with an activation energy of 24.24 kJ/mol. The catalyst could be reused for several cycles with negligible loss in activity.

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Nitridation of BaO supported on mesoporous materials: Basicity characterization and catalytic properties

Cited by 26 publications

References 50 publications

Design and fabrication of mesoporous heterogeneous basic catalysts

Design and fabrication of mesoporous heterogeneous basic catalysts

Reversible Phase Transfer of Carbon Dots between an Organic Phase and Aqueous Solution Triggered by CO₂

Kinetics of solid acids catalysed nitration of toluene: Change in selectivity by triphase (liquid–liquid–solid) catalysis

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Nitridation of BaO supported on mesoporous materials: Basicity characterization and catalytic properties

Cited by 26 publications

References 50 publications

Design and fabrication of mesoporous heterogeneous basic catalysts

Design and fabrication of mesoporous heterogeneous basic catalysts

Reversible Phase Transfer of Carbon Dots between an Organic Phase and Aqueous Solution Triggered by CO2

Kinetics of solid acids catalysed nitration of toluene: Change in selectivity by triphase (liquid–liquid–solid) catalysis

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Reversible Phase Transfer of Carbon Dots between an Organic Phase and Aqueous Solution Triggered by CO₂