Ce0·98Pd0·02O2-δ: Recyclable, ligand free palladium(II) catalyst for Heck reaction

Sanjaykumar, S. R.; Mukri, Bhaskar Devu; Patil, Satish; Madras, Giridhar; Hegde, M. S.

doi:10.1007/s12039-011-0103-6

Cited by 26 publications

(18 citation statements)

References 27 publications

(21 reference statements)

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“…Pd 2+ substituted in CeO 2 in the form of a Ce 0·98 Pd 0·02 O 1·98 solid solution is a new heterogeneous catalyst that exhibits high activity and 100% trans-selectivity for the Heck reactions of aryl bromides including heteroaryls with olefins. A recyclable Ce 0·98 Pd 0·02 O 1·98 catalyses the carbon-carbon cross coupling of substituted iodobenzene, substituted bromobenzenes and bromoheteroaryls with alkylacrylates and styrenes with good yields [102]. Observed turnover frequency (TOF) value for the reaction of iodobenzene and methyl acrylate is higher than other Pd substituted ligandless heterogeneous catalysts for C C cross coupling reactions reported in the literature.…”

Section: Catalytic Activities Of Noble Metal Ion Substituted Ceo 2 Camentioning

confidence: 96%

Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice

Hegde

Beraba

2015

Catalysis Today

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Section: Catalytic Activities Of Noble Metal Ion Substituted Ceo 2 Camentioning

confidence: 96%

Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice

Hegde

Beraba

2015

Catalysis Today

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“…163 Reprinted from [71] with permission of American Chemical Society and from [142] with permission of Elsevier B. V. Reprinted from [24] with permission of Elsevier B. V. and from [44] with permission of American Chemical Society. Reprinted from [192] with permission of Springer. Reprinted from [47] with permission of American Chemical Society and from [145] with permission of Springer.…”

Section: Ceomentioning

confidence: 99%

“…temperatures. Reprinted from [192] with permission of Springer. Reprinted from [71] with permission of American Chemical Society and from [142] with permission of Elsevier B. V. [24] with permission of Elsevier B. V. and from [44] with permission of American Chemical Society.…”

Section: Ceomentioning

confidence: 99%

Noble metal ions in CeO₂and TiO₂: synthesis, structure and catalytic properties

Bera

Hegde

2015

RSC Adv.

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In past four decades, CeO 2 has been recognized as an attractive material in the area of auto exhaust catalysis because of its unique redox properties. In presence of CeO 2 , catalytic activity of noble metals supported on Al 2 O 3 gets enhanced due to higher dispersion of noble metals in their ionic form. In last several years, we have been exploring an entirely new approach of dispersing noble metal ions on CeO 2 and TiO 2 matrices for redox catalysis. In this article, dispersing of noble metal ions by solution combustion as well as other methods over CeO 2 and TiO 2 resulting mainly in −δ (M = Pd, Pt, Rh and Ru) catalysts, structure of these materials, their catalytic properties toward different types of catalysis, structure−property relation and mechanism of catalytic reactions are reviewed. In these catalysts, noble metal ions are incorporated into substrate matrix to a certain limit in a solid solution form. Lower valent noble metal ion substitution in CeO 2 and TiO 2 creates noble metal ionic sites and oxide ion vacancies that act as adsorption sites for redox catalysis. It has been demonstrated that these new generation noble metal ionic catalysts (NMIC) have been found to be catalytically more active than conventional respective nano crystalline noble metal catalysts dispersed on oxide supports. 5 at.% and hence, substitution of only 1−2 at.% noble metal ion in CeO 2 is sufficient to develop a catalyst. The underlying principle of doping aliovalent metal ions into CeO 2 or TiO 2 lattice is to retain their parent structures. In this sense, new-age advanced catalysts such as Ce 1−x M x O 2−δ (M = Pd, Pt, Rh, Cu, Ag and Au), Ce 1−x−y A x M y O 2−δ (A = Ti, Zr, Sn and Fe; M = Pt and Pd) and Ti 1−x M x O 2−δ (M = Pd, Pt, Rh and Ru) retaining their parent fluorite and anatase structures have been prepared in our laboratory employing solution combustion method. 20−23 Thus, synthesis of these single phase oxides is a new conceptwhich is the basis of metal ion catalysts. In these catalysts, noble metal ions and corresponding oxide ion vacancies are supposed to be the active sites. Since, the adsorption sites in these catalysts are noble metal ions such as Pd 2+ , Pt 2+ , Rh 3+ and Ru 4+ , we have named these materials as noble metal ionic catalysts (NMIC). In last several years, we have been studying several exhaust catalytic reactions such as NO reduction, CO and hydrocarbon oxidation, selective catalytic reduction of NO, three-way catalytic reaction, water gas shift (WGS) reaction, preferential oxidation of CO (CO−PROX), H 2 + O 2 recombination reaction, hydrogenation and Heck reaction over these noble metal ionic catalysts and it has been demonstrated that these catalysts are much more active for several catalytic reactions compared to other conventional supported metal catalysts. In this review, at first, we mainly discuss about background, synthesis and characterization of these noble metal ionic catalysts (NMIC). Then we emphasize on our detailed work related to exhaust catalysis comparing activities with t...

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“…Additionally, palladium supported cerium-tin-oxides (general formula Ce x Sn y Pd 1-(x+y) O 2-δ ), that can be easily prepared via solution-combustion synthesis [3], have been established. The titanocenes are used for the production of chiral amines via hydrosilylation of imines [4], whereas the palladium compounds are used for Suzuki-Miyaura cross-coupling reactions [5,6].…”

Section: Continuous Processes For Api Productionmentioning

confidence: 99%

IPPE-TU Graz: green engineering inside and beyond the borders of process technology

Gruber‐Wölfler

Schnitzer

Narodoslawsky

et al. 2015

Green Processing and Synthesis

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Graz University of Technology consists of five independent research areas, each committed to high-level basic and applied research: -Pharmaceutical engineering and particle technology -Mechanical process engineering -Process evaluation -Energetic biomass utilization, and -Zero emissions techniques and systems.The research of these groups covers the areas of pharmaceutical product and process development, particle manufacturing and flow processes, sustainable regional development, thermal biomass utilization and sustainable energy on the basis of renewable resources. We see ourselves as the interface between nature, engineering sciences, society and economics and are very much aware of our responsibility for future generations -the human being is always in the focus of our research. Green process engineeringProcess engineering is arguably one of the disciplines that are at the frontline of human impact on the environment. Green process engineering is therefore one of the most important tasks of any process engineering research and development institutions. This mission is a major pillar of the activities of the IPPE.According to this mission, research at our institute focuses in part on chemical and pharmaceutical processes that are more intense, efficient and thus greener. One pathway followed here is the development and application of heterogeneous catalysis and micro-reactors that are capable of intensifying reactions considerably in order to achieve smaller footprints, to reduce costs, unwanted byproducts and energy consumption. Research at IPPE is, however, not restricted to the development of technologies that help to reduce the impact of process industries on the environment. IPPE also provides strategic decision support for industry to become greener. It also uses experiences and methods from chemical engineering to help beyond the confines of process engineering, providing innovative solutions for smart cities and regions.

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Ce0·98Pd0·02O2-δ: Recyclable, ligand free palladium(II) catalyst for Heck reaction

Cited by 26 publications

References 27 publications

Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice

Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice

Noble metal ions in CeO₂and TiO₂: synthesis, structure and catalytic properties

IPPE-TU Graz: green engineering inside and beyond the borders of process technology

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Ce0·98Pd0·02O2-δ: Recyclable, ligand free palladium(II) catalyst for Heck reaction

Cited by 26 publications

References 27 publications

Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice

Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice

Noble metal ions in CeO2and TiO2: synthesis, structure and catalytic properties

IPPE-TU Graz: green engineering inside and beyond the borders of process technology

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Product

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Noble metal ions in CeO₂and TiO₂: synthesis, structure and catalytic properties