Application of Conjugated Polymer–Platinum Group Metal Composites as Heterogeneous Catalysts

Abstract

Composites of polyaniline (PANI) or polypyrrole (PPy) doped with chloride ions and Pt or Rh particles were prepared by chemical reduction of metal ions conducted in the presence of the polymers. Based on X-ray diffraction studies it was established that the composites contained metal nanoparticles (5-9 in size). However, according to SEM investigations metal particles were agglomerated (40 nm-1.1 lm in size). Redox activity of the composites in the catalytic isopropyl alcohol conversion was ca. ten times higher than the acid-base one. Pt dispersed in polymer matrices showed higher catalytic activity than Rh. PPy doped with chloride ions had a promoting effect on the activity of Pt catalysts.

Synthesis, self‐assembly, fluorescence, and thermosensitive properties of star‐shaped amphiphilic copolymers with porphyrin core

“…To obtain more properties such as fluorescence, [45][46][47] molecule recognizability, [48][49][50] catalytic capability, 51,52 therapy capability, 53,54 and so forth, we conjugated porphyrin as the core of the star-shaped polymers. Compared with other star polymers with core molecules including trimethylolpropane, calixarenes, cyclodextrins and so on, 44,[55][56][57][58] porphyrin, as one of the important photosensitizers, was attractive because of its promising photoelectric functions for various applications containing light-harvesting materials, 59,60 optoelectronic devices, 61 but also its novel therapeutic capacities such as tumor targeting and photodynamic therapy 62,63 for biomedical application.…”

‘Dip Catalysts’ Based on Polymer‐Metal Nanocomposite Thin Films: Combining Soft‐Chemical Fabrication with Efficient Application and Monitoring

“…Catalytic applications of polymer‐metal nanocomposites, especially in the colloidal form, are well‐known; combination of the catalytic properties of metal nanoparticles and the unique characteristics of polymers have found use in a variety of reactions including hydrogenation of olefins, dehydration of isopropyl alcohol, methanol oxidation, hydrogenation of aromatic nitro compounds and Suzuki‐Miyaura coupling ,. Polymer‐metal core‐shell structures have been shown to be efficient catalysts for hydrogenation of 4‐nitrophenol and quinoline, and aerobic oxidation of alcohol; specific examples include Pt nanoparticles on a resin layer formed on solid silica spheres, hollow polymer nanoshells with Pt nanoparticles on the surface, and Au and Ag−Au nanoparticles loaded on polymer microspheres .…”

Nanopartículas catalíticas… ¿polvo mágico?

“…Pt/poliaril éter dendrímero de amin diacético ácido Hidrogenación de derivados de nitrobenceno Yang et al, 2006 Hidrogenación de fenil aldehídos Du et al, 2006 Pt-SiO 2 /PAMAM como plantilla, diferentes tamaños Hidrogenación de etileno y pirrol Huang et al, 2008 Hidrogenación de tolueno, oxidación de CO Lang et al, 2003 Pt/PPI and PAMAM Reducción de 4-nitrofenol Esumi et al, 2004 Pt/PAMAM Reducción electrocatalítico de oxígeno Crooks et al, 2007 Pt/poliestireno hipercruzado y cinconidina como modificador quiral Hidrogenación enantioselectiva de etilpiruvato Bykov et al, 2009 Pt/hiperramificado poli(amidoamina) Hidrogenación de isoforona Marty et al, 2008 Pt/MWCNT/PBI Oxidación de metanol Okamoto et al, 2009 Pt/MWCNT/PANI Oxidación electroquímica de ácido fórmico Zhu et al, 2008 Pt/fibras de negro de carbono o SWCNT Celdas de combustible PEM Taylor et al, 2008 Pt/PPy o PANI Conversión de alcohol isopropílico Hasik et al, 2009 Pt/Al 2 O 3 y ácido poliacrílico como agente encapsulador Hidrogenación de propeno Yoo et al, 2002 Pt/cetonas y/o polímeros como plantilla, cinconidina o cinconina como modificador quiral Hidrogenación enantioselectiva de etil piruvato Collier et al, 1999 Pt/PVP Deshalogenación e hidrodearomatización de monoclorobenceno Pt-MCM-41/PVP como plantilla Hidrogenación de ácido cinámico Lin et al, 2004 Pt/nanoalambres de PPy Oxidación electroquímica de metanol y reducción de oxígeno Pt/silsesquioxanos de octa(aminofenilo diacético)…”