Hierarchical silica monoliths with submicron macropores as continuous-flow microreactors for reaction kinetic and mechanistic studies in heterogeneous catalysis

2018 ◽  
Vol 3 (3) ◽  
pp. 353-364 ◽  
Author(s):  
Richard Kohns ◽  
Christian P. Haas ◽  
Alexandra Höltzel ◽  
Christian Splith ◽  
Dirk Enke ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Continuous Flow ◽  
Reaction Kinetic ◽  
Kinetic Studies ◽  
Mechanistic Studies ◽  
Silica Monoliths ◽  
Flow Microreactors

The proposed scheme enables academic laboratories to prepare hierarchical silica monoliths as continuous-flow microreactors for kinetic studies in heterogeneous catalysis.

scholarly journals Selective Reduction of Ketones and Aldehydes in Continuous-Flow Microreactor—Kinetic Studies

Catalysts ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 221 ◽  
Author(s):  
Katarzyna Maresz ◽  
Agnieszka Ciemięga ◽  
Julita Mrowiec-Białoń
Keyword(s):  
Continuous Flow ◽  
Flow Reactor ◽  
Flow Characteristics ◽  
Selective Reduction ◽  
Kinetic Studies ◽  
Attractive Alternative ◽  
Batch Reactors ◽  
Flow Process ◽  
Micro Flow ◽  
Flow Microreactors

In this work, the kinetics of Meerwein–Ponndorf–Verley chemoselective reduction of carbonyl compounds was studied in monolithic continuous-flow microreactors. To the best of our knowledge, this is the first report on the MPV reaction kinetics performed in a flow process. The microreactors are a very attractive alternative to the batch reactors conventionally used in this process. The proposed micro-flow system for synthesis of unsaturated secondary alcohols proved to be very efficient and easily controlled. The microreactors had reactive cores made of zirconium-functionalized silica monoliths of excellent catalytic properties and flow characteristics. The catalytic experiments were carried out with the use of 2-butanol as a hydrogen donor. Herein, we present the kinetic parameters of cyclohexanone reduction in a flow reactor and data on the reaction rate for several important ketones and aldehydes. The lack of diffusion constraints in the microreactors was demonstrated. Our results were compared with those from other authors and demonstrate the great potential of microreactor applications in fine chemical and complex intermediate manufacturing.

scholarly journals Lipase immobilised on silica monoliths as continuous-flow microreactors for triglyceride transesterification

2018 ◽  
Vol 3 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Mohammed Alotaibi ◽  
Jinesh C. Manayil ◽  
Gillian M. Greenway ◽  
Stephen J. Haswell ◽  
Stephen M. Kelly ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Silica Monoliths ◽  
Bio Oil ◽  
Flow Microreactors

Lipase immobilised on silica monoliths has been prepared and applied as biocatalytic continuous-flow microreactors for the transesterification of tributyrin as a model bio-oil component.

Heterogeneous catalysis with continuous flow microreactors

2012 ◽  
Vol 2 (10) ◽  
pp. 2134 ◽  
Author(s):  
Xiaoying Liu ◽  
Barış Ünal ◽  
Klavs F. Jensen
Keyword(s):  
Heterogeneous Catalysis ◽  
Continuous Flow ◽  
Flow Microreactors

Heterogeneous catalysis in continuous flow microreactors: A review of methods and applications

2017 ◽  
Vol 327 ◽  
pp. 792-821 ◽  
Author(s):  
Abdulkadir Tanimu ◽  
Stephan Jaenicke ◽  
Khalid Alhooshani
Keyword(s):  
Heterogeneous Catalysis ◽  
Continuous Flow ◽  
Flow Microreactors

Facile synthesis of gemini surface-active ATRP initiator and its use in soap-free AGET ATRP mini-emulsion polymerisation

2013 ◽  
Vol 67 (3) ◽  
Author(s):  
Chuan Cheng ◽  
Quan Fu ◽  
Xiong Bai ◽  
Shao Liu ◽  
Liang Shen ◽  
...  
Keyword(s):  
Gemini Surfactant ◽  
Reaction Kinetic ◽  
Total Yield ◽  
Kinetic Studies ◽  
Facile Synthesis ◽  
Aget Atrp ◽  
Cationic Gemini Surfactant ◽  
Emulsion Polymerisation ◽  
Radical Polymerisation ◽  
Surface Active

AbstractA novel cationic gemini surfactant has been readily synthesised in 70 % total yield. The functional gemini surfactant can act both as an emulsifier and an atom transfer radical polymerisation (ATRP) initiator in mini-emulsion polymerisation of methyl methacrylate (MMA), in which no other emulsifier was required. 1-(Dimethylamino)dodecane (N,N-dimethyldodecylamine, DMDA) was found to be a good ligand in the activator generated by electron transfer (AGET) ATRP reaction. Kinetic studies indicated that the polymerisation featured controlled/living radical polymerisation.

Photocatalytic Degradation of Methyl Orange by TiO2/Schorl Photocatalyst: Kinetics and Thermodynamics

2015 ◽  
Vol 713-715 ◽  
pp. 2789-2792
Author(s):  
Huan Yan Xu ◽  
Xue Li ◽  
Yan Li ◽  
Ping Li ◽  
Wei Chao Liu
Keyword(s):  
Methyl Orange ◽  
Reaction Rate ◽  
Reaction Kinetic ◽  
Kinetic Studies ◽  
Reaction Rate Constant ◽  
Order Reaction ◽  
Solution Ph ◽  
Kinetics And Thermodynamics ◽  
Hoff Equation ◽  
Degradation Of Methyl Orange

An active dye, Methyl Orange (MO) was employed as the target pollutant to evaluate the photocatalytic activity of TiO2/schorl composite and the kinetics and thermodynamics of this process was emphasized in this work. Langmuir–Hinshelwood kinetic model was employed for the kinetic studies and the results revealed that the process of MO photocatalytic discoloration by TiO2/schorl composite followed one order reaction kinetic equation under different conditions. The reaction rate constant (k) increased with initial MO concentration decreasing. When the catalyst dosage or solution pH increased,kvalues increased and then decreased. The possible reasons for these phenomena were discussed. Finally, the thermodynamic parameters ΔG, ΔH, ΔSwere obtained by the classical Van't Hoff equation.

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