scholarly journals Base-free conversion of glycerol to methyl lactate using a multifunctional catalytic system consisting of Au–Pd nanoparticles on carbon nanotubes and Sn-MCM-41-XS

2019 ◽  
Vol 21 (15) ◽  
pp. 4115-4126 ◽  
Author(s):  
Zhenchen Tang ◽  
Dina G. Boer ◽  
Ali Syariati ◽  
Mihaela Enache ◽  
Petra Rudolf ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic System ◽  
Pd Nanoparticles ◽  
Catalytic Systems ◽  
Methyl Lactate ◽  
Efficient Conversion ◽  
Highly Efficient ◽  
Mcm 41

Base-free, multifunctional heterogenous catalytic systems for the highly efficient conversion of glycerol into methyl lactate.

Synergetic combination of a mesoporous polymeric acid and a base enables highly efficient heterogeneous catalytic one-pot conversion of crude Jatropha oil into biodiesel

2020 ◽  
Vol 22 (5) ◽  
pp. 1698-1709 ◽  
Author(s):  
Hu Pan ◽  
Yanan Liu ◽  
Qineng Xia ◽  
Heng Zhang ◽  
Li Guo ◽  
...  
Keyword(s):  
Catalytic System ◽  
Jatropha Oil ◽  
One Pot ◽  
Heterogeneous Catalytic ◽  
Mild Conditions ◽  
Efficient Conversion ◽  
Highly Efficient ◽  
Polymeric Acid

Highly efficient conversion of crude Jatropha oil to biodiesel was realized under mild conditions via a synergistic catalytic system consisting of acid (MICPHPW) and base (MICPOH) catalysts using a ‘one-pot, two-step’ strategy.

Metal-functionalized carbon nanotubes for biomass conversion: base-free highly efficient and recyclable catalysts for aerobic oxidation of 5-hydroxymethylfurfural

2019 ◽  
Vol 43 (26) ◽  
pp. 10601-10609 ◽  
Author(s):  
Poonam Sharma ◽  
Mohit Solanki ◽  
Rakesh K. Sharma
Keyword(s):  
Carbon Nanotubes ◽  
Selective Oxidation ◽  
Noble Metal ◽  
Catalytic System ◽  
Biomass Conversion ◽  
Aerobic Oxidation ◽  
Functionalized Carbon Nanotubes ◽  
Highly Efficient ◽  
Recyclable Catalysts ◽  
Furandicarboxylic Acid

A noble and non-noble metal-confined CNT-based catalytic system was developed for the base-free selective oxidation of 5-hydroxymethylfurfural to produce 2,5-furandicarboxylic acid and 2,5-diformylfurane.

scholarly journals Highly Efficient N-Heterocyclic Carbene/Ruthenium Catalytic Systems for the Acceptorless Dehydrogenation of Alcohols to Carboxylic Acids: Effects of Ancillary and Additional Ligands

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 10 ◽  
Author(s):  
Wan-Qiang Wang ◽  
Hua Cheng ◽  
Ye Yuan ◽  
Yu-Qing He ◽  
Hua-Jing Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Carboxylic Acids ◽  
Catalytic System ◽  
Efficient Manner ◽  
Catalytic Systems ◽  
Highly Efficient ◽  
Highly Active ◽  
Ru Complexes ◽  
Alcohol Dehydrogenation ◽  
Metal Catalyzed

The transition-metal-catalyzed alcohol dehydrogenation to carboxylic acids has been identified as an atom-economical and attractive process. Among various catalytic systems, Ru-based systems have been the most accessed and investigated ones. With our growing interest in the discovery of new Ru catalysts comprising N-heterocyclic carbene (NHC) ligands for the dehydrogenative reactions of alcohols, we designed and prepared five NHC/Ru complexes ([Ru]-1–[Ru]-5) bearing different ancillary NHC ligands. Moreover, the effects of ancillary and additional ligands on the alcohol dehydrogenation with KOH were thoroughly explored, followed by the screening of other parameters. Accordingly, a highly active catalytic system, which is composed of [Ru]-5 combined with an additional NHC precursor L5, was discovered, affording a variety of acid products in a highly efficient manner. Gratifyingly, an extremely low Ru loading (125 ppm) and the maximum TOF value until now (4800) were obtained.

Poly(ethylene glycol) based bis-diol as a functional medium for highly efficient conversion of urea and methanol to dimethyl carbonate

2016 ◽  
Vol 18 (3) ◽  
pp. 798-801 ◽  
Author(s):  
Zhaofu Zhang ◽  
Lujun Zhang ◽  
Congyi Wu ◽  
Qingli Qian ◽  
Qinggong Zhu ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Conventional Method ◽  
Catalytic System ◽  
Dimethyl Carbonate ◽  
Poly Ethylene Glycol ◽  
Efficient Conversion ◽  
Highly Efficient ◽  
Equilibrium Yield ◽  
Poly Ethylene

Poly(ethylene glycol) based bis-diol/ZnO is an excellent catalytic system for the reaction of urea and methanol to produce DMC. The equilibrium yield of DMC in the reaction can be ten times higher than that of the conventional method.

Conversion of Biomass-Derived Carbohydrates to Methyl Lactate Using Sn-MCM-41 and SnO2/SiO2

2013 ◽  
Vol 33 (10) ◽  
pp. 1696-1705
Author(s):  
Zhen LIU ◽  
Gang FENG ◽  
Chunyan PAN ◽  
Wang LI ◽  
Ping CHEN ◽  
...  
Keyword(s):  
Methyl Lactate ◽  
Mcm 41

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.

scholarly journals Mini-Review on the Synthesis of Furfural and Levulinic Acid from Lignocellulosic Biomass

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1234
Author(s):  
Zhiwei Jiang ◽  
Di Hu ◽  
Zhiyue Zhao ◽  
Zixiao Yi ◽  
Zuo Chen ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Lignocellulosic Biomass ◽  
Catalytic System ◽  
Levulinic Acid ◽  
Value Added ◽  
Environmental Issues ◽  
Alternative Route ◽  
Catalytic Systems ◽  
Renewable Biomass ◽  
Platform Chemicals

Efficient conversion of renewable biomass into value-added chemicals and biofuels is regarded as an alternative route to reduce our high dependence on fossil resources and the associated environmental issues. In this context, biomass-based furfural and levulinic acid (LA) platform chemicals are frequently utilized to synthesize various valuable chemicals and biofuels. In this review, the reaction mechanism and catalytic system developed for the generation of furfural and levulinic acid are summarized and compared. Special efforts are focused on the different catalytic systems for the synthesis of furfural and levulinic acid. The corresponding challenges and outlooks are also observed.

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