Efficient synthesis of 5-hydroxymethylfurfural from mannose with a reusable MCM-41-supported tin catalyst

2018 ◽  
Vol 8 (21) ◽  
pp. 5526-5534 ◽  
Author(s):  
Songyan Jia ◽  
Xinjun He ◽  
Jiao Ma ◽  
Kangjun Wang ◽  
Zhanwei Xu ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Significant Loss ◽  
Efficient Synthesis ◽  
Tin Catalyst ◽  
Mcm 41

The Sn/MCM-41 catalyst was demonstrated to be effective for the conversion of mannose into 5-HMF, with comparable performances to those of reported heterogeneous catalysts. The Sn/MCM-41 catalyst was reusable without significant loss of activity after eight consecutive runs.

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

An Efficient Synthesis of Heterogeneous and Hard Bound Ti IV ‐MCM‐41 Catalyzed Mannich Bases and π‐Conjugated Imines

2021 ◽  
Vol 6 (48) ◽  
pp. 14071-14076
Author(s):  
Shenbagapushpam Muthumanickam ◽  
Muthukumar Thennila ◽  
Paneerselvam Yuvaraj ◽  
Kanthapalam Arun Prasath Lingam ◽  
Kodirajan Selvakumar
Keyword(s):  
Mannich Bases ◽  
Efficient Synthesis ◽  
Mcm 41

Functionalized Mesoporous MCM-41 as a Hybrid Catalyst for the Efficient Synthesis of Chromene and Mono/Bis Phthalazine-Trione Derivatives

2021 ◽  
pp. 1-14
Author(s):  
Mohammad Ali Bodaghifard ◽  
Mojgan Zendehdel ◽  
Mahdia Hamidinasab ◽  
Najmieh Ahadi ◽  
Raziyeh Zandi
Keyword(s):  
Efficient Synthesis ◽  
Hybrid Catalyst ◽  
Mcm 41

scholarly journals Advanced Oxidation Process for Degradation of Carbamazepine from Aqueous Solution: Influence of Metal Modified Microporous, Mesoporous Catalysts on the Ozonation Process

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 90 ◽  
Author(s):  
Soudabeh Saeid ◽  
Matilda Kråkström ◽  
Pasi Tolvanen ◽  
Narendra Kumar ◽  
Kari Eränen ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Advanced Oxidation Process ◽  
Degradation Products ◽  
Degradation Kinetics ◽  
Removal Rate ◽  
Influence Of Temperature On ◽  
Two Temperatures ◽  
Kinetics Of ◽  
Ozonation Process ◽  
Mcm 41

Carbamazepine (CBZ), a widely used pharmaceutical compound, is one of the most detected drugs in surface waters. The purpose of this work was to identify an active and durable catalyst, which, in combination with an ozonation process, could be used to remove CBZ and its degradation products. It was found that the CBZ was completely transformed after ozonation within the first minutes of the treatment. However, the resulting degradation products, 1-(2-benzaldehyde)-4-hydro-(1H,3H)-quinazoline-2-one (BQM) and 1-(2-benzaldehyde)-(1H,3H)-quinazoline-2,4-dione (BQD), were more resistant during the ozonation process. The formation and degradation of these products were studied in more detail and a thorough catalytic screening was conducted to reveal the reaction kinetics of both the CBZ and its degradation products. The work was performed by non-catalytic ozonation and with six different heterogeneous catalysts (Pt-MCM-41-IS, Ru-MCM-41-IS, Pd-H-Y-12-EIM, Pt-H-Y-12-EIM, Pd-H-Beta-300-EIM and Cu-MCM-41-A-EIM) operating at two temperatures 20 °C and 50 °C. The influence of temperature on degradation kinetics of CBZ, BQM and BQD was studied. The results exhibited a notable difference in the catalytic behavior by varying temperature. The higher reactor temperature (50 °C) showed a higher activity of the catalysts but a lower concentration of dissolved ozone. Most of the catalysts exhibited higher removal rate for BQM and BQD compared to non-catalytic experiments in both temperatures. The Pd-H-Y-12-EIM catalyst illustrated a higher degradation rate of by-products at 50 °C compared to other catalysts.

Bis-ammonium immobilized polystyrenes with co-catalyzing functional end groups as efficient and reusable heterogeneous catalysts for synthesis of cyclic carbonate from CO2 and epoxides

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2217-2224 ◽  
Author(s):  
Qingyuan Deng ◽  
Gaohong He ◽  
Yu Pan ◽  
Xuehua Ruan ◽  
Wenji Zheng ◽  
...  
Keyword(s):  
Functional Groups ◽  
Heterogeneous Catalysts ◽  
Cyclic Carbonate ◽  
Efficient Synthesis ◽  
End Groups

Novel bis-ammonium immobilized polystyrenes with co-catalyzing functional groups were prepared for efficient synthesis of cyclic carbonate from CO2 and epoxides.

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