Tuning Catalytic Selectivity of Oxidative Catalysis through Deposition of Nonmetallic Atoms in Surface Lattice of Metal Oxide

ACS Catalysis ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 4218-4228 ◽  
Author(s):  
Juanjuan Liu ◽  
Shiran Zhang ◽  
Yan Zhou ◽  
Victor Fung ◽  
Luan Nguyen ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Catalytic Selectivity ◽  
Surface Lattice ◽  
Oxidative Catalysis

Promotion of catalytic selectivity on transition metal oxide through restructuring surface lattice

2018 ◽  
Vol 237 ◽  
pp. 957-969 ◽  
Author(s):  
Juanjuan Liu ◽  
Victor Fung ◽  
Yong Wang ◽  
Kaimin Du ◽  
Shiran Zhang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Transition Metal Oxide ◽  
Catalytic Selectivity ◽  
Surface Lattice

scholarly journals Controlling hot electron flux and catalytic selectivity with nanoscale metal-oxide interfaces

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Si Woo Lee ◽  
Jong Min Kim ◽  
Woonghyeon Park ◽  
Hyosun Lee ◽  
Gyu Rac Lee ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Methanol Oxidation ◽  
Methyl Formate ◽  
Electron Flow ◽  
Nanowire Arrays ◽  
Methanol Oxidation Reaction ◽  
Hot Electron ◽  
Oxide Interface ◽  
Oxide Interfaces ◽  
Catalytic Selectivity

AbstractInteraction between metal and oxides is an important molecular-level factor that influences the selectivity of a desirable reaction. Therefore, designing a heterogeneous catalyst where metal-oxide interfaces are well-formed is important for understanding selectivity and surface electronic excitation at the interface. Here, we utilized a nanoscale catalytic Schottky diode from Pt nanowire arrays on TiO2 that forms a nanoscale Pt-TiO2 interface to determine the influence of the metal-oxide interface on catalytic selectivity, thereby affecting hot electron excitation; this demonstrated the real-time detection of hot electron flow generated under an exothermic methanol oxidation reaction. The selectivity to methyl formate and hot electron generation was obtained on nanoscale Pt nanowires/TiO2, which exhibited ~2 times higher partial oxidation selectivity and ~3 times higher chemicurrent yield compared to a diode based on Pt film. By utilizing various Pt/TiO2 nanostructures, we found that the ratio of interface to metal sites significantly affects the selectivity, thereby enhancing chemicurrent yield in methanol oxidation. Density function theory (DFT) calculations show that formation of the Pt-TiO2 interface showed that selectivity to methyl formate formation was much larger in Pt nanowire arrays than in Pt films because of the different reaction mechanism.

Existence of Cubic ZrO2 at 300°C on Bulk Zirconium

1969 ◽  
Vol 27 ◽  
pp. 166-167
Author(s):  
R.A. Ploc
Keyword(s):  
Metal Oxide ◽  
Metal Substrate ◽  
Preferred Orientation ◽  
Monoclinic Zirconia ◽  
Epitaxial Relationship

The manner in which ZrO2 forms on zirconium at 300°C in air has been discussed in the first reference. In short, monoclinic zirconia nucleates and grows with a preferred orientation relative to the metal substrate. The mode of growth is not well understood since an epitaxial relationship which gives minimum misfit between the zirconium ions in the metal/oxide combination is not realized. The reason may be associated with a thin cubic or tetragonal layer of ZrO2 between the inner oxygen saturated metal and the outer monoclinic zirconia.

Observations of Frozen-Hydrated Microtubules

1990 ◽  
Vol 48 (1) ◽  
pp. 504-505
Author(s):  
D. Chrétien ◽  
D. Job ◽  
R.H. Wade
Keyword(s):  
Fourier Transforms ◽  
Structural Complexity ◽  
Image Contrast ◽  
Phase Behaviour ◽  
Experimental Conditions ◽  
Thin Sections ◽  
Surface Lattice ◽  
Cilia And Flagella ◽  
Outstanding Question

Microtubules are filamentary structures found in the cytoplasm of eukaryotic cells, where, together with actin and intermediate filaments, they form the components of the cytoskeleton. They have many functions and show various levels of structural complexity as witnessed by the singlet, doublet and triplet structures involved in the architecture of centrioles, basal bodies, cilia and flagella. The accepted microtubule model consists of a 25 nm diameter hollow tube with a wall made up of 13 paraxial protofilaments (pf). Each pf is a string of aligned tubulin dimers. Some results have suggested that the pfs follow a superhelix. To understand how microtubules function in the cell an accurate model of the surface lattice is one of the requirements. For example the 9x2 architecture of the axoneme will depend on the organisation of its component microtubules. We should also note that microtubules with different numbers of pfs have been observed in thin sections of cellular and of in-vitro material. An outstanding question is how does the surface lattice adjust to these different pf numbers?We have been using cryo-electron microscopy of frozen-hydrated samples to study in-vitro assembled microtubules. The experimental conditions are described in detail in this reference. The results obtained in conjunction with thin sections of similar specimens and with axoneme outer doublet fragments have already allowed us to characterise the image contrast of 13, 14 and 15 pf microtubules on the basis of the measured image widths, of the the image contrast symmetry and of the amplitude and phase behaviour along the equator in the computed Fourier transforms. The contrast variations along individual microtubule images can be interpreted in terms of the geometry of the microtubule surface lattice. We can extend these results and make some reasonable predictions about the probable surface lattices in the case of other pf numbers, see Table 1. Figure 1 shows observed images with which these predictions can be compared.

Recent advancement in the electrocatalytic synthesis of ammonia

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8065-8094 ◽  
Author(s):  
Xudong Wen ◽  
Jingqi Guan
Keyword(s):  
Metal Oxide ◽  
Oxide Catalysts ◽  
Single Atom ◽  
Metal Oxide Catalysts ◽  
Metal Free ◽  
Recent Advancement ◽  
Nanocomposite Catalysts

Different kinds of electrocatalysts used in NRR electrocatalysis (including single atom catalysts, metal oxide catalysts, nanocomposite catalysts, and metal free catalysts) are introduced.

Routes of metal oxide formation from metal β-diketonates used as CVD precursors

1999 ◽  
Vol 09 (PR8) ◽  
pp. Pr8-65-Pr8-72 ◽  
Author(s):  
A. E. Turgambaeva ◽  
V. V. Krisyuk ◽  
A. F. Bykov ◽  
I. K. Igumenov
Keyword(s):  
Metal Oxide ◽  
Oxide Formation

STRUCTURE OF METAL-OXIDE INTERFACES

1985 ◽  
Vol 46 (C4) ◽  
pp. C4-135-C4-140 ◽  
Author(s):  
M. Leseur ◽  
B. Pieraggi
Keyword(s):  
Metal Oxide ◽  
Oxide Interfaces ◽  
Structure Of Metal

METAL-OXIDE INTERFACES OBTAINED BY SELECTIVE CHEMICAL REDUCTION OF LAMELLAR OXIDE-OXIDE EUTECTIC STRUCTURES

1990 ◽  
Vol 51 (C1) ◽  
pp. C1-781-C1-787
Author(s):  
B. BONVALOT ◽  
G. DHALENNE ◽  
F. MILLOT ◽  
A. REVCOLEVSCHI
Keyword(s):  
Metal Oxide ◽  
Chemical Reduction ◽  
Oxide Interfaces ◽  
Selective Chemical
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