High-precision synthesis of α-MnO2 nanowires with controllable crystal facets for propane oxidation

CrystEngComm ◽  
2021 ◽  
Author(s):  
Chao Feng ◽  
Gaoyan Xiong ◽  
Yaping Li ◽  
Qianqian Gao ◽  
Yuan Pan ◽  
...  
Keyword(s):  
High Precision ◽  
Propane Oxidation ◽  
Oxidation Catalyst ◽  
Crystal Facet ◽  
Reaction Performance ◽  
Precision Synthesis ◽  
Mno2 Nanowires

Determining the effect of crystal facet on the reaction performance is essential for designing an efficient propane oxidation catalyst. Herein, α-MnO2 nanowires with exposed (110), (211), (310) and (200) facets...

scholarly journals The impact of steam on the electronic structure of the selective propane oxidation catalyst MoVTeNb oxide (orthorhombic M1 phase)

2015 ◽  
Vol 17 (14) ◽  
pp. 8983-8993 ◽  
Author(s):  
Christian Heine ◽  
Michael Hävecker ◽  
Annette Trunschke ◽  
Robert Schlögl ◽  
Maik Eichelbaum
Keyword(s):  
Electronic Structure ◽  
Acrylic Acid ◽  
Surface Structure ◽  
Propane Oxidation ◽  
Oxidation Catalyst ◽  
M1 Phase ◽  
The Impact

Steam modifies the surface structure of the propane oxidation catalyst MoVTeNbOx and increases the selectivity to the product acrylic acid.

High Precision Synthesis of a Richards Immittance Via Parametric Approach

2014 ◽  
Vol 61 (4) ◽  
pp. 1055-1067 ◽  
Author(s):  
Binboga Siddik Yarman ◽  
Ramazan Kopru ◽  
Narendra Kumar ◽  
Chacko Prakash
Keyword(s):  
High Precision ◽  
Parametric Approach ◽  
Precision Synthesis

scholarly journals Facile Fabrication of Macroscopic Self-Standing Ni or Co-doped MnO2 Architectures as Catalysts for Propane Oxidation

Technologies ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 81 ◽  
Author(s):  
Long Chen ◽  
Xiping Song
Keyword(s):  
Hydrothermal Reaction ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Propane Oxidation ◽  
Practical Applications ◽  
Catalytic Activities ◽  
Co Doping ◽  
Facile Fabrication ◽  
Co Doped ◽  
Mno2 Nanowires

The fabrication of macroscopic self-standing architectures plays a key role in the practical applications of nanomaterials. A facile strategy to assemble MnO2 nanowires into macroscopic self-standing architectures via hydrothermal reaction followed by ambient pressure drying was developed. The obtained sample was robust and showed excellent mechanical strength with a Young’s modulus of 127 MPa, which had the possibility for practical applications. In order to promote the catalytic activity for propane oxidation, Ni or Co doping into MnO2 was studied. The results showed that the obtained macroscopic self-standing Ni-MnO2 and Co-MnO2 architectures exhibited enhanced catalytic activities for propane oxidation. Specifically, the conversions of propane over Co-MnO2 and Ni-MnO2 samples at 400 °C were 27.3% and 25.7% higher than that over pristine MnO2 sample.

STEM HAADF Image Simulation of the Orthorhombic M1 Phase in the Mo-V-Nb-Te-O Propane Oxidation Catalyst

ChemCatChem ◽  
2011 ◽  
Vol 3 (6) ◽  
pp. 1028-1033 ◽  
Author(s):  
Douglas A. Blom ◽  
Xin Li ◽  
Sonali Mitra ◽  
Thomas Vogt ◽  
Douglas J. Buttrey
Keyword(s):  
Propane Oxidation ◽  
Oxidation Catalyst ◽  
Image Simulation ◽  
M1 Phase ◽  
Haadf Image

scholarly journals Macromolecular Design via an Organocatalytic, Monomer-Specific and Temperature-Dependent “On/Off Switch”. High Precision Synthesis of Polyester/Polycarbonate Multiblock Copolymers

2015 ◽  
Vol 48 (6) ◽  
pp. 1703-1710 ◽  
Author(s):  
Peter Olsén ◽  
Karin Odelius ◽  
Helmut Keul ◽  
Ann-Christine Albertsson
Keyword(s):  
High Precision ◽  
Multiblock Copolymers ◽  
Temperature Dependent ◽  
Precision Synthesis

scholarly journals Performance modulation of α-MnO2 nanowires by crystal facet engineering

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Wenxian Li ◽  
Xiangyuan Cui ◽  
Rong Zeng ◽  
Guodong Du ◽  
Ziqi Sun ◽  
...  
Keyword(s):  
Crystal Facet ◽  
Mno2 Nanowires

Development of high throughput, high precision synthesis platforms and characterization methodologies for toxicological studies of nanocellulose

Cellulose ◽  
2018 ◽  
Vol 25 (4) ◽  
pp. 2303-2319 ◽  
Author(s):  
Georgios Pyrgiotakis ◽  
Wing Luu ◽  
Zhenyuan Zhang ◽  
Nachiket Vaze ◽  
Glen DeLoid ◽  
...  
Keyword(s):  
High Precision ◽  
High Throughput ◽  
Toxicological Studies ◽  
Precision Synthesis

Automatic measurement of SAED patterns from asbestos minerals

1988 ◽  
Vol 46 ◽  
pp. 846-847
Author(s):  
J. C. Russ ◽  
T. Taguchi ◽  
P. M. Peters ◽  
E. Chatfield ◽  
J. C. Russ ◽  
...  
Keyword(s):  
Diffraction Pattern ◽  
High Precision ◽  
Diffraction Data ◽  
Automatic Measurement ◽  
Automatic Method ◽  
Important Method ◽  
X Ray ◽  
Integrated Intensity ◽  
Asbestiform Minerals ◽  
True Center

Conventional SAD patterns as obtained in the TEM present difficulties for identification of materials such as asbestiform minerals, although diffraction data is considered to be an important method for making this purpose. The preferred orientation of the fibers and the spotty patterns that are obtained do not readily lend themselves to measurement of the integrated intensity values for each d-spacing, and even the d-spacings may be hard to determine precisely because the true center location for the broken rings requires estimation. We have implemented an automatic method for diffraction pattern measurement to overcome these problems. It automatically locates the center of patterns with high precision, measures the radius of each ring of spots in the pattern, and integrates the density of spots in that ring. The resulting spectrum of intensity vs. radius is then used just as a conventional X-ray diffractometer scan would be, to locate peaks and produce a list of d,I values suitable for search/match comparison to known or expected phases.

On effects of non-systematic reflections on weak-beam images of partial dislocations

1991 ◽  
Vol 49 ◽  
pp. 688-689
Author(s):  
K. Z. Botros ◽  
S. S. Sheinin
Keyword(s):  
High Precision ◽  
Stacking Fault ◽  
Important Application ◽  
Stacking Fault Energy ◽  
Sharp Peak ◽  
Weak Beam ◽  
Partial Dislocations ◽  
Deviation Parameter ◽  
Beam Diffraction

The main features of weak beam images of dislocations were first described by Cockayne et al. using calculations of intensity profiles based on the kinematical and two beam dynamical theories. The feature of weak beam images which is of particular interest in this investigation is that intensity profiles exhibit a sharp peak located at a position very close to the position of the dislocation in the crystal. This property of weak beam images of dislocations has an important application in the determination of stacking fault energy of crystals. This can easily be done since the separation of the partial dislocations bounding a stacking fault ribbon can be measured with high precision, assuming of course that the weak beam relationship between the positions of the image and the dislocation is valid. In order to carry out measurements such as these in practice the specimen must be tilted to "good" weak beam diffraction conditions, which implies utilizing high values of the deviation parameter Sg.

Digital differential hysteresis iimage processing displays what the microscope acquires but the eye can't see

1995 ◽  
Vol 53 ◽  
pp. 642-643
Author(s):  
Klaus-Ruediger Peters
Keyword(s):  
Image Processing ◽  
Visual System ◽  
High Precision ◽  
Image Data ◽  
Processing Technology ◽  
Output Data ◽  
Contrast Resolution ◽  
Pixel Intensity ◽  
Data Reading ◽  
Hysteresis Properties

Differential hysteresis processing is a new image processing technology that provides a tool for the display of image data information at any level of differential contrast resolution. This includes the maximum contrast resolution of the acquisition system which may be 1,000-times higher than that of the visual system (16 bit versus 6 bit). All microscopes acquire high precision contrasts at a level of <0.01-25% of the acquisition range in 16-bit - 8-bit data, but these contrasts are mostly invisible or only partially visible even in conventionally enhanced images. The processing principle of the differential hysteresis tool is based on hysteresis properties of intensity variations within an image.Differential hysteresis image processing moves a cursor of selected intensity range (hysteresis range) along lines through the image data reading each successive pixel intensity. The midpoint of the cursor provides the output data. If the intensity value of the following pixel falls outside of the actual cursor endpoint values, then the cursor follows the data either with its top or with its bottom, but if the pixels' intensity value falls within the cursor range, then the cursor maintains its intensity value.

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