Positron annihilation study of chitosan and its derived carbon/pillared montmorillonite clay stabilized Pd species nanocomposites

Chen, Yuli; Yang, Shuai; Zhang, Taojun; Xu, Minghan; Zhao, Jing; Zeng, Minfeng; Sun, Kailang; Yang, Ruokun Feng Zhen; Zhang, Peng; Wang, Baoyi; Cao, Xingzhong

doi:10.1016/j.polymertesting.2022.107689

Cited by 6 publications

(3 citation statements)

References 58 publications

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“…The yields of the reaction were measured by GC/MS quantitative analysis based on peak-area of the coupling products and unreacted aryl halide reactant using normalization method. All the structure information was in good agreement with our recent works [16,33,34]. The recycling experiments of Pd heterogeneous catalysts were performed using the model coupling reaction of iodo benzene and phenyl acetylene.…”

Section: Catalyst Performancessupporting

confidence: 85%

Modification of Pillared Intercalated Montmorillonite Clay as Heterogeneous Pd Catalyst Supports

Sun,

Liu,

Zhang

et al. 2023

Molecules

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Montmorillonite clay was modified by pillaring with AlMn oxides in different Al/Mn ratios and intercalation of two kinds of N-containing polymers (i.e., chitosan (CS) and polyvinyl pyrrolidinone (PVP)) chains. The modified pillared montmorillonite clay (PM) showed a rich two-dimensional layered porous structure with tunable parameters, such as large interlayer spacing, high specific area, and large porous volume. They were then used as supports for Pd nanoparticles. As applied in coupling reactions of aryl halides with terminal alkynes, Pd@CS/AlMn-PM showed better comprehensive catalytic performance than Pd@PVP/AlMn-PM. This was mainly attributed to its higher specific area, stronger chelation to Pd species, and better solvent resistance.

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Section: Catalyst Performancessupporting

confidence: 85%

Modification of Pillared Intercalated Montmorillonite Clay as Heterogeneous Pd Catalyst Supports

Sun,

Liu,

Zhang

et al. 2023

Molecules

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“…Utilizing the electrostatic interaction between the negative charges between the layers of clay and the positive charges of cationic molecules, organic polymer‐inorganic (clay) hybrids can be fabricated by intercalating cationic monomers or polymers such as aniline, chitosan, poly(1‐methyl‐4‐vinylpyridinium), and polyethyleneimine (PEI) [27–30] . Amine groups can interact with the metal ions; previously, utilizing the chitosan or chitosan‐derived carbon, Pd or Co/clay/chitosan or chitosan‐derived carbon composites were developed [31–33] . PEI, which has a higher proportion of N atoms in the polymer framework than chitosan, has been also used for developing the metal/clay composites.…”

Section: Introductionmentioning

confidence: 99%

“…[27][28][29][30] Amine groups can interact with the metal ions; previously, utilizing the chitosan or chitosan-derived carbon, Pd or Co/clay/chitosan or chitosanderived carbon composites were developed. [31][32][33] PEI, which has a higher proportion of N atoms in the polymer framework than chitosan, has been also used for developing the metal/clay composites. Cu/PEI/clay and Au/PEI/clay composites were fabricated by introducing PEI-capped Cu nanoparticles between clay nanosheets and reducing the gold ions on PEI-intercalated clay, respectively.…”

Section: Introductionmentioning

confidence: 99%

Polymer Template Synthesis of CuO_x/Clay Nanocomposites with Controllable CuO_x Formation

Takeuchi,

Ohkubo

2023

ChemistrySelect

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Metal oxides have the excellent functions including high thermal stability, electrical properties, catalytic performance, and adsorption properties of acid gases such as CO2 via the acid‐base interactions. However, they suffer from low reserves, porosity control, and low adsorption efficiency per weight compared with lightweight materials including carbon and silica. To solve these issues, various methods for supporting metal oxides on porous carriers, such as decomposition‐precipitation and impregnation, have been investigated, but controlling the formation of metal oxide on clay nanosheets remains as a challenge. Herein, we developed a soft‐template method for supporting metal oxide (CuOx) nanoparticles on activated clay nanosheets. The intercalation of polyethyleneimine (PEI)−Cu2+ complexes between the layers of clay nanosheets followed by calcination to construct CuOx and remove the PEI templates afforded CuOx/clay nanocomposites. The constructed CuOx/clay nanocomposites had the close porosity to that of clay. Tuning the Cu2+/PEI ratio in PEI−Cu2+ complex allowed to control CuOx states (loadings, particle sizes, etc.). Tuning of the supporting conditions allowed constructing a structure suitable for CO2 uptake. These findings will contribute to the development of the material science of metal oxide nanoparticles and their hybrid materials in diverse fields including CO2 adsorbents, energy devices, and catalysts.

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Functionalization of the magnetic chitosan support with dipyridylamine as a nitrogen-rich pincer ligand for Pd immobilization and investigation of catalytic efficiency in Sonogashira coupling

Rafiee

Rezaee

2022

Polym. Bull.

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Positron annihilation study of chitosan and its derived carbon/pillared montmorillonite clay stabilized Pd species nanocomposites

Cited by 6 publications

References 58 publications

Modification of Pillared Intercalated Montmorillonite Clay as Heterogeneous Pd Catalyst Supports

Modification of Pillared Intercalated Montmorillonite Clay as Heterogeneous Pd Catalyst Supports

Polymer Template Synthesis of CuO_x/Clay Nanocomposites with Controllable CuO_x Formation

Functionalization of the magnetic chitosan support with dipyridylamine as a nitrogen-rich pincer ligand for Pd immobilization and investigation of catalytic efficiency in Sonogashira coupling

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Positron annihilation study of chitosan and its derived carbon/pillared montmorillonite clay stabilized Pd species nanocomposites

Cited by 6 publications

References 58 publications

Modification of Pillared Intercalated Montmorillonite Clay as Heterogeneous Pd Catalyst Supports

Modification of Pillared Intercalated Montmorillonite Clay as Heterogeneous Pd Catalyst Supports

Polymer Template Synthesis of CuOx/Clay Nanocomposites with Controllable CuOx Formation

Functionalization of the magnetic chitosan support with dipyridylamine as a nitrogen-rich pincer ligand for Pd immobilization and investigation of catalytic efficiency in Sonogashira coupling

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Polymer Template Synthesis of CuO_x/Clay Nanocomposites with Controllable CuO_x Formation