Thermoresponsive self-assembled cyclodextrin-end-decorated PNIPAM for aqueous catalysis

2015 ◽  
Vol 51 (12) ◽  
pp. 2328-2330 ◽  
Author(s):  
J. Potier ◽  
S. Menuel ◽  
J. Lyskawa ◽  
D. Fournier ◽  
F. Stoffelbach ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Terminal Position ◽  
Self Assembled ◽  
Aqueous Catalysis ◽  
Higher Olefins

The catalytic performance of thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) functionalized at the terminal position with randomly methylated β-cyclodextrin was demonstrated by the aqueous Rh-catalysed hydroformylation of higher olefins.

Self-Assembled Enzymatic Nanowires with a “Dry and Wet” Interface Improve the Catalytic Performance of Januvia Transaminase in Organic Solvents

ACS Catalysis ◽  
2021 ◽  
pp. 372-382
Author(s):  
Cuihua Wei ◽  
Juan Zhou ◽  
Tiangang Liu ◽  
Wanqi Zhao ◽  
Xian-En Zhang ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Catalytic Performance ◽  
Self Assembled

scholarly journals Composite Nanostructure of Manganese Cluster and CHA-Type Silicoaluminaphosphates: Enhanced Catalytic Performance in Dimethylether to Light Olefins Conversion

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 24
Author(s):  
Guichen Ping ◽  
Kai Zheng ◽  
Qihua Fang ◽  
Gao Li
Keyword(s):  
Physical Adsorption ◽  
Strong Acid ◽  
Catalytic Performance ◽  
Light Olefins ◽  
Acidic Property ◽  
One Pot ◽  
Icp Ms ◽  
27Al Mas Nmr ◽  
Increasing Demand ◽  
Higher Olefins

Light olefins, especially ethylene and propylene, are important chemicals in petrochemical industries with an increasing demand and play an essential role in the global consumption. In this regard, there have been extensive studies to design efficient catalysts for the light olefins productions. In this study, we report a new protocol to induce Mn nanoclusters (MnNC) into the mesopore of a CHA-type silicoaluminaphosphates via a one-pot synthesis of MnNC@SAPO-34 catalysts. The catalysts are characterized by a series of technology, such as TEM, XRD, NH3-TPD, 27Al MAS NMR, ICP-MS, XPS, and as well as N2-physical adsorption methods. The Mn nanoclusters of Mn2O3 and MnO2 species are well dispersed in the framework of the SAPO-34 silicoaluminaphosphates, modifying the porosity and acidic property of the SAPO-34: Giving rise to more mesoporous and improving the acid density. The MnNC@SAPO-34 catalysts exhibit decent 100% conversion and 92.2% olefins selectivity in the dimethyl ether to olefins (DTO) reactions, which is considerably higher than that for SAPO-34 silicoaluminaphosphates (79.6% olefins selectivity). The higher olefins selectivity over the MnNC@SAPO-34 is deemed to associate with the strong acid density and intensity of the silicoaluminaphosphates. Further, the Mn particles largely improve silicoaluminaphosphates’s durability.

scholarly journals Self-assembled palladium nanoflowers supported on fullerene: Electrochemical catalytic performance for the reduction of 4-nitrophenol

2019 ◽  
Vol 104 ◽  
pp. 106484 ◽  
Author(s):  
Zhongping Li ◽  
Yuxin Zhang ◽  
Ruiqi Zhu ◽  
Guangming Wen ◽  
Chuan Dong ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Self Assembled

scholarly journals Accelerated Reaction Rates within Self-Assembled Polymer Nanoreactors with Tunable Hydrophobic Microenvironments

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1774
Author(s):  
Andrew Harrison ◽  
Michael P. Zeevi ◽  
Christopher L. Vasey ◽  
Matthew D. Nguyen ◽  
Christina Tang
Keyword(s):  
Self Assembly ◽  
Noncovalent Interactions ◽  
Hydrophobic Effect ◽  
Hierarchical Structures ◽  
Reaction Rates ◽  
Catalytic Performance ◽  
Polymer Micelle ◽  
Amphiphilic Macromolecules ◽  
Multiple Reactions ◽  
Self Assembled

Performing reactions in the presence of self-assembled hierarchical structures of amphiphilic macromolecules can accelerate reactions while using water as the bulk solvent due to the hydrophobic effect. We leveraged non-covalent interactions to self-assemble filled-polymer micelle nanoreactors (NR) incorporating gold nanoparticle catalysts into various amphiphilic polymer nanostructures with comparable hydrodynamic nanoreactor size and gold concentration in the nanoreactor dispersion. We systematically studied the effect of the hydrophobic co-precipitant on self-assembly and catalytic performance. We observed that co-precipitants that interact with gold are beneficial for improving incorporation efficiency of the gold nanoparticles into the nanocomposite nanoreactor during self-assembly but decrease catalytic performance. Hierarchical assemblies with co-precipitants that leverage noncovalent interactions could enhance catalytic performance. For the co-precipitants that do not interact strongly with gold, the catalytic performance was strongly affected by the hydrophobic microenvironment of the co-precipitant. Specifically, the apparent reaction rate per surface area using castor oil (CO) was over 8-fold greater than polystyrene (750 g/mol, PS 750); the turnover frequency was higher than previously reported self-assembled polymer systems. The increase in apparent catalytic performance could be attributed to differences in reactant solubility rather than differences in mass transfer or intrinsic kinetics; higher reactant solubility enhances apparent reaction rates. Full conversion of 4-nitrophenol was achieved within three minutes for at least 10 sequential reactions demonstrating that the nanoreactors could be used for multiple reactions.

Embedding of a ruthenium(ii) water oxidation catalyst into nanofibers via self-assembly

2015 ◽  
Vol 51 (2) ◽  
pp. 290-293 ◽  
Author(s):  
Valentin Kunz ◽  
Vladimir Stepanenko ◽  
Frank Würthner
Keyword(s):  
Water Splitting ◽  
Self Assembly ◽  
Water Oxidation ◽  
Catalytic Performance ◽  
Oxidation Catalyst ◽  
Self Assembled

Self-assembled nanofibers of a ruthenium(ii)–PBI complex exhibited an appreciable catalytic performance in the oxidative water splitting reaction.

Study of the effect of polymorphism on the self-assembly and catalytic performance of an l-proline based molecular hydrogelator

2015 ◽  
Vol 39 (5) ◽  
pp. 3785-3791 ◽  
Author(s):  
Santiago Díaz-Oltra ◽  
Cristina Berdugo ◽  
Juan F. Miravet ◽  
Beatriu Escuder
Keyword(s):  
Self Assembly ◽  
Aldol Reaction ◽  
Catalytic Performance ◽  
The Self ◽  
Direct Aldol Reaction ◽  
Self Assembled

Polymorphs of a self-assembled proline-based catalyst lead to different catalytic results in a direct aldol reaction.

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