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Richard G. Finke - One of the best experts on this subject based on the ideXlab platform.
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Quantitative 1,10-Phenanthroline Catalyst-Poisoning Kinetic Studies of Rh(0) Nanoparticle and Rh4 Cluster Benzene Hydrogenation Catalysts: Estimates of the Poison Kassociation Binding Constants, of the Equivalents of Poison Bound and of the Number of
ACS Catalysis, 2012Co-Authors: Ercan Bayram, Richard G. FinkeAbstract:Quantitative Catalyst Poisoning studies are of fundamental interest and importance because (a) knowledge of the number of true active sites is required for calculation of the true turnover frequency = (moles of product)/(moles of actual active sites)(time), and because (b) quantitative Catalyst Poisoning is proving to be a key, required piece of data en route to distinguishing single metal (M1), small metal cluster (e.g., M4), or metal nanoparticle (Mn) catalysis. In evidence of the latter point, quantitative Catalyst Poisoning experiments using 1,10-phenanthroline as the poison proved to be crucial in the recent identification of Rh4 subnanometer clusters as the true benzene hydrogenation Catalyst in a system beginning with [RhCp*Cl2]2 (Cp*: (η5-C5(CH3)5)) at 100 °C and 50 atm initial H2 pressure (Bayram et al. J. Am. Chem. Soc.2011, 133, 18889). However and despite the success of those quantitative Poisoning studies, five questions about such Poisoning studies remained unanswered, questions posed and th...
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Nanoclusters in catalysis: A comparison of CS2 Catalyst Poisoning of polyoxoanion- and tetrabutylammonium-stabilized 40 ′ 6 a Rh(0) nanoclusters to 5% Rh/Al2O3, including an analysis of the literature related to the CS2 to metal stoichiometry issue
Inorganic chemistry, 2002Co-Authors: Brooks J. Hornstein, John Davis Aiken, Richard G. FinkeAbstract:It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms × time)); (ii) to know for certain whether a (quantitatively) better Catalyst has been madeon a per-active-metal-atom basis; (iii) to know the amount of active sites remaining in a deactivated Catalyst; and (iv) to know how many active sites have been regenerated in a reactivated Catalyst. For this reason, herein we report the first quantitative, more complete and fundamental study of nanocluster Catalyst Poisoning using the preferred CS2 method with polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters; 5% Rh/Al2O3 is also examined as a valuable comparison point. Both Catalysts are examined under essentially identical conditions and while catalyzing a prototype reaction, cyclohexene hydrogenation. A number of control studies are also reported to be ...
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nanoclusters in catalysis a comparison of cs2 Catalyst Poisoning of polyoxoanion and tetrabutylammonium stabilized 40 6 a rh 0 nanoclusters to 5 rh al2o3 including an analysis of the literature related to the cs2 to metal stoichiometry issue
Inorganic Chemistry, 2002Co-Authors: Brooks J. Hornstein, John Davis Aiken, Richard G. FinkeAbstract:It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms × time)); (ii) to know for certain whether a (quantitatively) better Catalyst has been madeon a per-active-metal-atom basis; (iii) to know the amount of active sites remaining in a deactivated Catalyst; and (iv) to know how many active sites have been regenerated in a reactivated Catalyst. For this reason, herein we report the first quantitative, more complete and fundamental study of nanocluster Catalyst Poisoning using the preferred CS2 method with polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters; 5% Rh/Al2O3 is also examined as a valuable comparison point. Both Catalysts are examined under essentially identical conditions and while catalyzing a prototype reaction, cyclohexene hydrogenation. A number of control studies are also reported to be ...
Brooks J. Hornstein - One of the best experts on this subject based on the ideXlab platform.
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Nanoclusters in catalysis: A comparison of CS2 Catalyst Poisoning of polyoxoanion- and tetrabutylammonium-stabilized 40 ′ 6 a Rh(0) nanoclusters to 5% Rh/Al2O3, including an analysis of the literature related to the CS2 to metal stoichiometry issue
Inorganic chemistry, 2002Co-Authors: Brooks J. Hornstein, John Davis Aiken, Richard G. FinkeAbstract:It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms × time)); (ii) to know for certain whether a (quantitatively) better Catalyst has been madeon a per-active-metal-atom basis; (iii) to know the amount of active sites remaining in a deactivated Catalyst; and (iv) to know how many active sites have been regenerated in a reactivated Catalyst. For this reason, herein we report the first quantitative, more complete and fundamental study of nanocluster Catalyst Poisoning using the preferred CS2 method with polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters; 5% Rh/Al2O3 is also examined as a valuable comparison point. Both Catalysts are examined under essentially identical conditions and while catalyzing a prototype reaction, cyclohexene hydrogenation. A number of control studies are also reported to be ...
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nanoclusters in catalysis a comparison of cs2 Catalyst Poisoning of polyoxoanion and tetrabutylammonium stabilized 40 6 a rh 0 nanoclusters to 5 rh al2o3 including an analysis of the literature related to the cs2 to metal stoichiometry issue
Inorganic Chemistry, 2002Co-Authors: Brooks J. Hornstein, John Davis Aiken, Richard G. FinkeAbstract:It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms × time)); (ii) to know for certain whether a (quantitatively) better Catalyst has been madeon a per-active-metal-atom basis; (iii) to know the amount of active sites remaining in a deactivated Catalyst; and (iv) to know how many active sites have been regenerated in a reactivated Catalyst. For this reason, herein we report the first quantitative, more complete and fundamental study of nanocluster Catalyst Poisoning using the preferred CS2 method with polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters; 5% Rh/Al2O3 is also examined as a valuable comparison point. Both Catalysts are examined under essentially identical conditions and while catalyzing a prototype reaction, cyclohexene hydrogenation. A number of control studies are also reported to be ...
Martin D Smith - One of the best experts on this subject based on the ideXlab platform.
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heterogeneous or homogeneous a case study involving palladium containing perovskites in the suzuki reaction
Advanced Synthesis & Catalysis, 2005Co-Authors: Stephen P Andrews, Antonia F Stepan, Hirohisa Tanaka, Martin D SmithAbstract:The utility of a series of palladium-containing perovskite Catalysts in the Suzuki reaction is described; turnover numbers of up to 400,000 are reported. A detailed investigation into the mode of action of these Catalysts encompassing kinetic studies, Catalyst Poisoning, microscopy and three-phase tests demonstrate that these heterogeneous materials are pre-Catalysts that operate by a solution-phase mechanism
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Heterogeneous or Homogeneous? A Case Study Involving Palladium‐Containing Perovskites in the Suzuki Reaction
Advanced Synthesis & Catalysis, 2005Co-Authors: Stephen P Andrews, Antonia F Stepan, Hirohisa Tanaka, Martin D Smith, Steven V. LeyAbstract:The utility of a series of palladium-containing perovskite Catalysts in the Suzuki reaction is described; turnover numbers of up to 400,000 are reported. A detailed investigation into the mode of action of these Catalysts encompassing kinetic studies, Catalyst Poisoning, microscopy and three-phase tests demonstrate that these heterogeneous materials are pre-Catalysts that operate by a solution-phase mechanism
John Davis Aiken - One of the best experts on this subject based on the ideXlab platform.
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Nanoclusters in catalysis: A comparison of CS2 Catalyst Poisoning of polyoxoanion- and tetrabutylammonium-stabilized 40 ′ 6 a Rh(0) nanoclusters to 5% Rh/Al2O3, including an analysis of the literature related to the CS2 to metal stoichiometry issue
Inorganic chemistry, 2002Co-Authors: Brooks J. Hornstein, John Davis Aiken, Richard G. FinkeAbstract:It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms × time)); (ii) to know for certain whether a (quantitatively) better Catalyst has been madeon a per-active-metal-atom basis; (iii) to know the amount of active sites remaining in a deactivated Catalyst; and (iv) to know how many active sites have been regenerated in a reactivated Catalyst. For this reason, herein we report the first quantitative, more complete and fundamental study of nanocluster Catalyst Poisoning using the preferred CS2 method with polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters; 5% Rh/Al2O3 is also examined as a valuable comparison point. Both Catalysts are examined under essentially identical conditions and while catalyzing a prototype reaction, cyclohexene hydrogenation. A number of control studies are also reported to be ...
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nanoclusters in catalysis a comparison of cs2 Catalyst Poisoning of polyoxoanion and tetrabutylammonium stabilized 40 6 a rh 0 nanoclusters to 5 rh al2o3 including an analysis of the literature related to the cs2 to metal stoichiometry issue
Inorganic Chemistry, 2002Co-Authors: Brooks J. Hornstein, John Davis Aiken, Richard G. FinkeAbstract:It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms × time)); (ii) to know for certain whether a (quantitatively) better Catalyst has been madeon a per-active-metal-atom basis; (iii) to know the amount of active sites remaining in a deactivated Catalyst; and (iv) to know how many active sites have been regenerated in a reactivated Catalyst. For this reason, herein we report the first quantitative, more complete and fundamental study of nanocluster Catalyst Poisoning using the preferred CS2 method with polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters; 5% Rh/Al2O3 is also examined as a valuable comparison point. Both Catalysts are examined under essentially identical conditions and while catalyzing a prototype reaction, cyclohexene hydrogenation. A number of control studies are also reported to be ...
Stephen P Andrews - One of the best experts on this subject based on the ideXlab platform.
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heterogeneous or homogeneous a case study involving palladium containing perovskites in the suzuki reaction
Advanced Synthesis & Catalysis, 2005Co-Authors: Stephen P Andrews, Antonia F Stepan, Hirohisa Tanaka, Martin D SmithAbstract:The utility of a series of palladium-containing perovskite Catalysts in the Suzuki reaction is described; turnover numbers of up to 400,000 are reported. A detailed investigation into the mode of action of these Catalysts encompassing kinetic studies, Catalyst Poisoning, microscopy and three-phase tests demonstrate that these heterogeneous materials are pre-Catalysts that operate by a solution-phase mechanism
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Heterogeneous or Homogeneous? A Case Study Involving Palladium‐Containing Perovskites in the Suzuki Reaction
Advanced Synthesis & Catalysis, 2005Co-Authors: Stephen P Andrews, Antonia F Stepan, Hirohisa Tanaka, Martin D Smith, Steven V. LeyAbstract:The utility of a series of palladium-containing perovskite Catalysts in the Suzuki reaction is described; turnover numbers of up to 400,000 are reported. A detailed investigation into the mode of action of these Catalysts encompassing kinetic studies, Catalyst Poisoning, microscopy and three-phase tests demonstrate that these heterogeneous materials are pre-Catalysts that operate by a solution-phase mechanism