Limits...
The superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet.

Li Y, Sun Q - Sci Rep (2014)

Bottom Line: Two-dimensional organometallic sheets containing regularly and separately distributed transition atoms (TMs) have received tremendous attentions due to their flexibility in synthesis, well-defined geometry and the promising applications in hydrogen storage, electronic circuits, quantum Hall effect, and spintronics.Here for the first time we present a study on the superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet proceeding first via Langmuir-Hinshelwood (LH) mechanism and then via Eley-Rideal (ER) mechanism.Compared to the noble metal based catalysts or graphene supported catalysts, our studied system has following unique features: without poisoning effect and clustering problem, having comparable reaction energy barrier for low-temperature oxidation, and low cost for large-scale catalytic CO oxidation in industry.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.

ABSTRACT
Two-dimensional organometallic sheets containing regularly and separately distributed transition atoms (TMs) have received tremendous attentions due to their flexibility in synthesis, well-defined geometry and the promising applications in hydrogen storage, electronic circuits, quantum Hall effect, and spintronics. Here for the first time we present a study on the superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet proceeding first via Langmuir-Hinshelwood (LH) mechanism and then via Eley-Rideal (ER) mechanism. Compared to the noble metal based catalysts or graphene supported catalysts, our studied system has following unique features: without poisoning effect and clustering problem, having comparable reaction energy barrier for low-temperature oxidation, and low cost for large-scale catalytic CO oxidation in industry.

No MeSH data available.


Related in: MedlinePlus

Schematic illustration of 2D TMPc sheet and its catalytic behavior toward CO oxidation.The highlighted areas denote the most catalytically active sites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3924217&req=5

f1: Schematic illustration of 2D TMPc sheet and its catalytic behavior toward CO oxidation.The highlighted areas denote the most catalytically active sites.

Mentions: The recent success in embedding Fe atoms into a 2D polymeric phthalocyanine (Pc) sheet18 inspired us to employ metal-phthalocyanine-based sheets as the candidates of low-temperature CO oxidation catalysts. Indeed, various experimental192021222324 and theoretical252627 efforts have been devoted to unveil the observed catalytic activities of molecular transition metal phthalocyanine compounds towards oxygen reduction reaction and CO2 reduction reaction. The 2D Pc sheets, as illustrated in Figure 1, are superior to defected graphene/CNTs based systems due to the following reasons: First, the synthesis procedure of 2D FePc framework is flexible for other TM elements, indicating that other 2D TMPc sheets are able to be synthesized in the future. Second, the structural motif of 2D FePc framework highly resembles biological metalloporphyrin systems such as hemoglobin, where the kernel of hemoglobin possesses strong binding affinity to CO and O228. Therefore, it seems plausible to assume that certain kinds of 2D TMPc sheets can also reversibly bind CO and O2 ligands, which acts as an indispensible prerequisite in the whole catalytic CO oxidation process. Third, the electronic states of TM atoms can be effectively tuned by the Pc square planar ligand field and by varying the metal atom at the Pc center29, enabling us to systematically investigate the catalytic behavior of various 2D TMPc sheets. Although the basic magnetic properties, intrinsic magnetic couplings and gas storage properties of 2D TMPc frameworks have been thoroughly investigated303132333435, the possibility of such systems for catalyzing CO oxidation and their corresponding reaction mechanisms have not been well addressed yet.


The superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet.

Li Y, Sun Q - Sci Rep (2014)

Schematic illustration of 2D TMPc sheet and its catalytic behavior toward CO oxidation.The highlighted areas denote the most catalytically active sites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3924217&req=5

f1: Schematic illustration of 2D TMPc sheet and its catalytic behavior toward CO oxidation.The highlighted areas denote the most catalytically active sites.
Mentions: The recent success in embedding Fe atoms into a 2D polymeric phthalocyanine (Pc) sheet18 inspired us to employ metal-phthalocyanine-based sheets as the candidates of low-temperature CO oxidation catalysts. Indeed, various experimental192021222324 and theoretical252627 efforts have been devoted to unveil the observed catalytic activities of molecular transition metal phthalocyanine compounds towards oxygen reduction reaction and CO2 reduction reaction. The 2D Pc sheets, as illustrated in Figure 1, are superior to defected graphene/CNTs based systems due to the following reasons: First, the synthesis procedure of 2D FePc framework is flexible for other TM elements, indicating that other 2D TMPc sheets are able to be synthesized in the future. Second, the structural motif of 2D FePc framework highly resembles biological metalloporphyrin systems such as hemoglobin, where the kernel of hemoglobin possesses strong binding affinity to CO and O228. Therefore, it seems plausible to assume that certain kinds of 2D TMPc sheets can also reversibly bind CO and O2 ligands, which acts as an indispensible prerequisite in the whole catalytic CO oxidation process. Third, the electronic states of TM atoms can be effectively tuned by the Pc square planar ligand field and by varying the metal atom at the Pc center29, enabling us to systematically investigate the catalytic behavior of various 2D TMPc sheets. Although the basic magnetic properties, intrinsic magnetic couplings and gas storage properties of 2D TMPc frameworks have been thoroughly investigated303132333435, the possibility of such systems for catalyzing CO oxidation and their corresponding reaction mechanisms have not been well addressed yet.

Bottom Line: Two-dimensional organometallic sheets containing regularly and separately distributed transition atoms (TMs) have received tremendous attentions due to their flexibility in synthesis, well-defined geometry and the promising applications in hydrogen storage, electronic circuits, quantum Hall effect, and spintronics.Here for the first time we present a study on the superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet proceeding first via Langmuir-Hinshelwood (LH) mechanism and then via Eley-Rideal (ER) mechanism.Compared to the noble metal based catalysts or graphene supported catalysts, our studied system has following unique features: without poisoning effect and clustering problem, having comparable reaction energy barrier for low-temperature oxidation, and low cost for large-scale catalytic CO oxidation in industry.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.

ABSTRACT
Two-dimensional organometallic sheets containing regularly and separately distributed transition atoms (TMs) have received tremendous attentions due to their flexibility in synthesis, well-defined geometry and the promising applications in hydrogen storage, electronic circuits, quantum Hall effect, and spintronics. Here for the first time we present a study on the superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet proceeding first via Langmuir-Hinshelwood (LH) mechanism and then via Eley-Rideal (ER) mechanism. Compared to the noble metal based catalysts or graphene supported catalysts, our studied system has following unique features: without poisoning effect and clustering problem, having comparable reaction energy barrier for low-temperature oxidation, and low cost for large-scale catalytic CO oxidation in industry.

No MeSH data available.


Related in: MedlinePlus