Platinum embedded within carbon nanospheres for shape selective liquid phase hydrogenation

Maryam Peer, Ali Qajar, Billy Paul Matthew Holbrook, Ramakrishnan Rajagopalan, Henry C. Foley

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Reactant shape selective catalysis occurs when substrates of different sizes and shapes are consumed at different rates over catalysts that combine molecular sieving transport processes with reaction. By contrast the same substrates react at nearly equivalent rates over catalysts that have large, open pores that do not induce any form of molecular sieving. Here we describe the design and synthesis of reactant shape selective catalysts for liquid phase hydrogenation reactions. Using an emulsion polymerization of furfuryl alcohol, we have made catalysts that consist of microporous carbon nanospheres within which are embedded platinum nanoparticles. The porosity of the carbon spheres was found to be a key parameter affecting catalyst activity and selectivity; porosity was varied by adding pore forming agents, such as polyethylene glycol with different molecular weights, during synthesis, or by mild oxidation of the as-synthesized catalyst using carbon dioxide. In addition to increasing porosity to reduce mass transfer limitations, a synthesis of smaller carbon spheres (<200 nm) was devised to reduce the micropore diffusion length. Decreasing the particle size of the catalyst by adjusting the surfactant composition during polymerization, improved the effectiveness factor by approximately one order of magnitude making it as active as a comparable standard metal catalyst.

Original languageEnglish (US)
Pages (from-to)485-497
Number of pages13
JournalCarbon
Volume57
DOIs
StatePublished - Jan 1 2013

Fingerprint

Nanospheres
Platinum
Hydrogenation
Carbon
Catalysts
Liquids
Porosity
Catalyst selectivity
Emulsion polymerization
Substrates
Carbon Dioxide
Surface-Active Agents
Catalysis
Polyethylene glycols
Catalyst activity
Carbon dioxide
Alcohols
Surface active agents
Mass transfer
Metals

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Peer, Maryam ; Qajar, Ali ; Holbrook, Billy Paul Matthew ; Rajagopalan, Ramakrishnan ; Foley, Henry C. / Platinum embedded within carbon nanospheres for shape selective liquid phase hydrogenation. In: Carbon. 2013 ; Vol. 57. pp. 485-497.
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Platinum embedded within carbon nanospheres for shape selective liquid phase hydrogenation. / Peer, Maryam; Qajar, Ali; Holbrook, Billy Paul Matthew; Rajagopalan, Ramakrishnan; Foley, Henry C.

In: Carbon, Vol. 57, 01.01.2013, p. 485-497.

Research output: Contribution to journalArticle

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