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You searched for: Journal Journal of the American Chemical Society Remove constraint Journal: Journal of the American Chemical Society Publication Year 2017 Remove constraint Publication Year: 2017 Subject catalysts Remove constraint Subject: catalysts Subject methanol Remove constraint Subject: methanol Subject term catalysts Remove constraint Subject term: catalysts
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1. Catalysis and Inhibition in the Electrochemical Reduction of CO2 on Platinum in the Presence of Protonated Pyridine. New Insights into Mechanisms and Products

Author:
Dridi Hachem; Comminges Clément; Morais Claudia; Meledje Jean-Claude; Kokoh Kouakou Boniface; Costentin Cyrille; Savéant Jean-Michel
Source:
Journal of the American Chemical Society 2017 v.139 no.39 pp. 13922-13928
ISSN:
1520-5126
Subject:
adsorption; carbon dioxide; carbon monoxide; carbonic acid; catalysts; catalytic activity; electrochemistry; electrodes; electrolysis; energy; fuels; hydrogen production; infrared spectroscopy; methanol; platinum; pyridines
Abstract:
... In the framework of modern energy challenges, the reduction of CO₂ into fuels calls for electrogenerated low-valent transition metal complexes catalysts designed with considerable ingenuity and sophistication. For this reason, the report that a molecule as simple as protonated pyridine (PyH⁺) could catalyze the formation of methanol from the reduction of CO₂ on a platinum electrode triggered great ...
DOI:
10.1021/jacs.7b08028

2. Catalytic B–H Bond Insertion Reactions Using Alkynes as Carbene Precursors

Author:
Yang Ji-Min; Li Zi-Qi; Li Mao-Lin; He Qiao; Zhu Shou-Fei; Zhou Qi-Lin
Source:
Journal of the American Chemical Society 2017 v.139 no.10 pp. 3784-3789
ISSN:
1520-5126
Subject:
alkynes; boranes; borates; catalysts; copper; enantiomers; methanol; methodology
Abstract:
... Herein, we report transition-metal-catalyzed B–H bond insertion reactions between borane adducts and alkynes to afford organoboron compounds in excellent yields under mild reaction conditions. This successful use of alkynes as carbene precursors in these reactions constitutes a new route to organoboron compounds. The starting materials are safe and readily available, and the reaction exhibits 100% ...
DOI:
10.1021/jacs.6b13168

3. Confinement of Ultrasmall Cu/ZnOx Nanoparticles in Metal–Organic Frameworks for Selective Methanol Synthesis from Catalytic Hydrogenation of CO2

Author:
An Bing; Zhang Jingzheng; Cheng Kang; Ji Pengfei; Wang Cheng; Lin Wenbin
Source:
Journal of the American Chemical Society 2017 v.139 no.10 pp. 3834-3840
ISSN:
1520-5126
Subject:
carbon dioxide; catalysts; catalytic activity; coordination polymers; copper; hydrogenation; methanol; nanoparticles; separation; zinc oxide
Abstract:
... The interfaces of Cu/ZnO and Cu/ZrO₂ play vital roles in the hydrogenation of CO₂ to methanol by these composite catalysts. Surface structural reorganization and particle growth during catalysis deleteriously reduce these active interfaces, diminishing both catalytic activities and MeOH selectivities. Here we report the use of preassembled bpy and Zr₆(μ₃-O)₄(μ₃-OH)₄ sites in UiO-bpy metal–organic ...
DOI:
10.1021/jacs.7b00058

4. Discovery of Multicomponent Heterogeneous Catalysts via Admixture Screening: PdBiTe Catalysts for Aerobic Oxidative Esterification of Primary Alcohols

Author:
Mannel David S.; Ahmed Maaz S.; Root Thatcher W.; Stahl Shannon S.
Source:
Journal of the American Chemical Society 2017 v.139 no.4 pp. 1690-1698
ISSN:
1520-5126
Subject:
additives; catalysts; catalytic activity; charcoal; esterification; metalloids; methanol; oxidation; palladium; response surface methodology; screening; stoichiometry
Abstract:
... In the present study, we demonstrate the utility of “admixture screening” for the discovery of new multicomponent heterogeneous Pd catalyst compositions that are highly effective for aerobic oxidative methyl esterification of primary alcohols. The identification of possible catalysts for this reaction was initiated by the screening of simple binary and ternary admixtures of Pd/charcoal in combinat ...
DOI:
10.1021/jacs.6b12722

5. Enantioselective Formation of CF3-Bearing All-Carbon Quaternary Stereocenters via C–H Functionalization of Methanol: Iridium Catalyzed Allene Hydrohydroxymethylation

Author:
Michael Holmes; Khoa D. Nguyen; Leyah A. Schwartz; Tom Luong; Michael J. Krische
Source:
Journal of the American Chemical Society 2017 v.139 no.24 pp. 8114-8117
ISSN:
1520-5126
Subject:
allene; byproducts; carbon-hydrogen bond activation; catalysts; enantioselectivity; hydrogen; iridium; methanol; positional isomers
Abstract:
... Using an iridium catalyst modified by PhanePhos, CF₃-allenes react with methanol to form branched products of hydrohydroxymethylation as single regioisomers with excellent levels of enantiomeric enrichment. This hydrogen autotransfer process enables catalytic enantioselective formation of acyclic CF₃-bearing all-carbon quaternary stereocenters in the absence of stoichiometric metals or byproducts. ...
DOI:
10.1021/jacs.7b04374
PubMed:
28603973
PubMed Central:
PMC5651675

6. Methane Oxidation to Methanol Catalyzed by Cu-Oxo Clusters Stabilized in NU-1000 Metal–Organic Framework

Author:
Takaaki Ikuno; Jian Zheng; Aleksei Vjunov; Maricruz Sanchez-Sanchez; Manuel A. Ortuño; Dale R. Pahls; John L. Fulton; Donald M. Camaioni; Zhanyong Li; Debmalya Ray; B. Layla Mehdi; Nigel D. Browning; Omar K. Farha; Joseph T. Hupp; Christopher J. Cramer; Laura Gagliardi; Johannes A. Lercher
Source:
Journal of the American Chemical Society 2017 v.139 no.30 pp. 10294-10301
ISSN:
1520-5126
Subject:
X-ray absorption spectroscopy; carbon; carbon dioxide; catalysts; coordination polymers; cupric oxide; density functional theory; methane; methanol; oxidation
Abstract:
... Copper oxide clusters synthesized via atomic layer deposition on the nodes of the metal–organic framework (MOF) NU-1000 are active for oxidation of methane to methanol under mild reaction conditions. Analysis of chemical reactivity, in situ X-ray absorption spectroscopy, and density functional theory calculations are used to determine structure/activity relations in the Cu-NU-1000 catalytic system ...
DOI:
10.1021/jacs.7b02936

7. Remarkably Facile Borane-Promoted, Rhodium-Catalyzed Asymmetric Hydrogenation of Tri- and Tetrasubstituted Alkenes

Author:
Shoba Veronika M.; Takacs James M.
Source:
Journal of the American Chemical Society 2017 v.139 no.16 pp. 5740-5743
ISSN:
1520-5126
Subject:
alkenes; ambient temperature; catalysts; enantiomers; hydrogen; hydrogenation; methanol
Abstract:
... Oxime-directed catalytic asymmetric hydroboration is diverted to catalytic asymmetric hydrogenation (CAH) upon the addition of a proton source, such as MeOH, or by running the reaction under a hydrogen atmosphere. A borane (e.g., pinacolborane) is required to promote CAH. Tri- and tetrasubstituted alkenes, including the challenging all-alkyl tetrasubstituted alkenes, undergo CAH with enantiomer ra ...
DOI:
10.1021/jacs.7b02581
PubMed:
28394591
PubMed Central:
PMC5408738

8. Selective Activation of Methane on Single-Atom Catalyst of Rhodium Dispersed on Zirconia for Direct Conversion

Author:
Kwon Yongwoo; Kim Tae Yong; Kwon Gihun; Yi Jongheop; Lee Hyunjoo
Source:
Journal of the American Chemical Society 2017 v.139 no.48 pp. 17694-17699
ISSN:
1520-5126
Subject:
Fourier transform infrared spectroscopy; X-radiation; aqueous solutions; carbon dioxide; catalysts; chemical bonding; density functional theory; electron microscopy; ethane; gases; hydrogen peroxide; methane; methanol; models; nanoparticles; oxidants; oxygen; rhodium; temperature; value-added products; zirconium oxide
Abstract:
... Direct methane conversion into value-added products has become increasingly important. Because of inertness of methane, cleaving the first C–H bond has been very difficult, requiring high reaction temperature on the heterogeneous catalysts. Once the first C–H bond becomes activated, the remaining C–H bonds are successively dissociated on the metal surface, hindering the direct methane conversion i ...
DOI:
10.1021/jacs.7b11010

9. Spectro-Electrochemical Examination of the Formation of Dimethyl Carbonate from CO and Methanol at Different Electrode Materials

Author:
Figueiredo Marta C.; Trieu Vinh; Eiden Stefanie; Koper Marc T. M.
Source:
Journal of the American Chemical Society 2017 v.139 no.41 pp. 14693-14698
ISSN:
1520-5126
Subject:
additives; carbon monoxide; catalysts; electrochemistry; electrodes; electrosynthesis; gold; methanol; oxidation; palladium; platinum; reaction mechanisms; silver
Abstract:
... In this work, we report a fundamental mechanistic study of the electrochemical oxidative carbonylation of methanol with CO for the synthesis of dimethyl carbonate on metallic electrodes at low overpotentials. For the first time, the reaction was shown to take place on the metallic catalysts without need of oxidized metals or additives. Moreover, in-situ spectroelectrochemical techniques were appli ...
DOI:
10.1021/jacs.7b08208
PubMed:
28929754
PubMed Central:
PMC5677764

10. Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction

Author:
Qi Zhiyuan; Xiao Chaoxian; Liu Cong; Goh Tian Wei; Zhou Lin; Maligal-Ganesh Raghu; Pei Yuchen; Li Xinle; Curtiss Larry A.; Huang Wenyu
Source:
Journal of the American Chemical Society 2017 v.139 no.13 pp. 4762-4768
ISSN:
1520-5126
Subject:
carbon nanotubes; catalysts; fuel cells; hydroxyl radicals; methanol; methodology; nanoparticles; oxidation; porous media; prediction; silica; temperature; zinc
Abstract:
... Atomically ordered intermetallic nanoparticles (iNPs) have sparked considerable interest in fuel cell applications by virtue of their exceptional electronic and structural properties. However, the synthesis of small iNPs in a controllable manner remains a formidable challenge because of the high temperature generally required in the formation of intermetallic phases. Here we report a general metho ...
DOI:
10.1021/jacs.6b12780

11. Synthesis of Low Pt-Based Quaternary PtPdRuTe Nanotubes with Optimized Incorporation of Pd for Enhanced Electrocatalytic Activity

Author:
Ma Si-Yue; Li Hui-Hui; Hu Bi-Cheng; Cheng Xiang; Fu Qi-Qi; Yu Shu-Hong
Source:
Journal of the American Chemical Society 2017 v.139 no.16 pp. 5890-5895
ISSN:
1520-5126
Subject:
X-ray photoelectron spectroscopy; catalysts; chemical elements; electron transfer; methanol; nanotubes; nanowires; oxidation
Abstract:
... Improving heteroatomic interactions via alloying or forming heterogeneous catalysts is of importance to the enhancement in terms of electrocatalytic activity and stability. In this work, a simple galvanic replacement reaction was utilized to synthesize low Pt-based quaternary nanotubes (NTs). It is easy to obtain PtPdRuTe NTs with different composition and controlled shape using ultrathin Te nanow ...
DOI:
10.1021/jacs.7b01482

12. Tuning Selectivity of CO2 Hydrogenation Reactions at the Metal/Oxide Interface

Author:
Shyam Kattel; Ping Liu; Jingguang G. Chen
Source:
Journal of the American Chemical Society 2017 v.139 no.29 pp. 9739-9754
ISSN:
1520-5126
Subject:
active sites; carbon; carbon dioxide; carbon monoxide; catalysts; fuels; greenhouse gas emissions; hydrogenation; methane; methanol; nanoparticles
Abstract:
... The chemical transformation of CO₂ not only mitigates the anthropogenic CO₂ emission into the Earth’s atmosphere but also produces carbon compounds that can be used as precursors for the production of chemicals and fuels. The activation and conversion of CO₂ can be achieved on multifunctional catalytic sites available at the metal/oxide interface by taking advantage of the synergy between the meta ...
DOI:
10.1021/jacs.7b05362

13. Turning on the Protonation-First Pathway for Electrocatalytic CO2 Reduction by Manganese Bipyridyl Tricarbonyl Complexes

Author:
Ngo Ken T.; McKinnon Meaghan; Mahanti Bani; Narayanan Remya; Grills David C.; Ertem Mehmed Z.; Rochford Jonathan
Source:
Journal of the American Chemical Society 2017 v.139 no.7 pp. 2604-2618
ISSN:
1520-5126
Subject:
carbon dioxide; carbon monoxide; catalysts; dimerization; electrochemistry; electrolysis; hydrogen bonding; ligands; manganese; methanol; phenol; spectroscopy; thermodynamics
Abstract:
... Electrocatalytic reduction of CO₂ to CO is reported for the complex, {fac-Mnᴵ([(MeO)₂Ph]₂bpy)(CO)₃(CH₃CN)}(OTf), containing four pendant methoxy groups, where [(MeO)₂Ph]₂bpy = 6,6′-bis(2,6-dimethoxyphenyl)-2,2′-bipyridine. In addition to a steric influence similar to that previously established [Sampson, M. D. et al. J. Am. Chem. Soc. 2014, 136, 5460−5471] for the 6,6′-dimesityl-2,2′-bipyridine li ...
DOI:
10.1021/jacs.6b08776