scholarly journals A Two-Dimensional ‘Zigzag’ Silica Polymorph on a Metal Support

2018 ◽  
Vol 140 (19) ◽  
pp. 6164-6168 ◽  
Author(s):  
David Kuhness ◽  
Hyun Jin Yang ◽  
Hagen W. Klemm ◽  
Mauricio Prieto ◽  
Gina Peschel ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Metal Support ◽  
Silica Polymorph

ChemInform Abstract: Synthesis and Structure of ITQ-3, the First Pure Silica Polymorph with a Two-Dimensional System of Straight Eight-Ring Channels.

ChemInform ◽  
2010 ◽  
Vol 29 (12) ◽  
pp. no-no
Author(s):  
M. A. CAMBLOR ◽  
A. CORMA ◽  
P. LIGHTFOOT ◽  
L. A. VILLAESCUSA ◽  
P. A. WRIGHT
Keyword(s):  
Dimensional System ◽  
Two Dimensional ◽  
Pure Silica ◽  
Two Dimensional System ◽  
Silica Polymorph

Synthesis and Structure of ITQ-3, the First Pure Silica Polymorph with a Two-Dimensional System of Straight Eight-Ring Channels

1997 ◽  
Vol 36 (23) ◽  
pp. 2659-2661 ◽  
Author(s):  
Miguel A. Camblor ◽  
Avelino Corma ◽  
Philip Lightfoot ◽  
Luis A. Villaescusa ◽  
Paul A. Wright
Keyword(s):  
Dimensional System ◽  
Two Dimensional ◽  
Pure Silica ◽  
Two Dimensional System ◽  
Silica Polymorph

scholarly journals Reversing sintering effect of Ni particles on γ-Mo2N via strong metal support interaction

2021 ◽  
Author(s):  
Lili Lin ◽  
Jinjia Liu ◽  
Xi Liu ◽  
Zirui Gao ◽  
Ning Rui ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Experimental Studies ◽  
Two Dimensional ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Ni Clusters ◽  
Strong Metal Support Interaction ◽  
Sintering Effect

Abstract The reverse sintering effect of Ni particles under thermal treatment has been observed in the Ni/γ-Mo2N catalysts. The ab initio molecular dynamic simulation has demonstrated the redispersion of metallic Ni particles into under-coordinated two-dimensional Ni clusters over γ-Mo2N is a thermodynamically favorable process. Utilizing pre-synthesized 4 nm Ni nanoparticles as the loaded particles, a Ni-4nm/γ-Mo2N model catalyst was synthesized and used to study the reverse sintering effect by the combination of multiple in-situ characterization methods, including in-situ quick XANES and EXAFS, ambient pressure XPS and environmental SE/STEM etc. The theoretical and experimental studies both confirmed the reverse sintering effect in the Ni-γ-Mo2N system is driven by the strong metal-support interaction between Ni and γ-Mo2N. The potential application of the reverse sintering effect in heterogeneous catalysis has been realized using the high temperature favored CO2 hydrogenation reaction. The under-coordinated two-dimensional layered Ni clusters on molybdenum nitride support generated from the Ni-4nm/γ-Mo2N has been demonstrated to be a thermally stable catalyst in 50 h stability test, and exhibits a remarkable catalytic selectivity reverse compared with traditional Ni based catalyst, leading to a chemo-specific CO2 hydrogenation to CO.

scholarly journals Reversing sintering effect of Ni particles on γ-Mo2N via strong metal support interaction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Lili Lin ◽  
Jinjia Liu ◽  
Xi Liu ◽  
Zirui Gao ◽  
Ning Rui ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Molybdenum Nitride ◽  
Two Dimensional ◽  
Characterization Methods ◽  
Metal Support Interaction ◽  
Structural And Electronic Properties ◽  
Metal Support ◽  
Ni Clusters ◽  
Sintering Effect

AbstractReversing the thermal induced sintering phenomenon and forming high temperature stable fine dispersed metallic centers with unique structural and electronic properties is one of the ever-lasting targets of heterogeneous catalysis. Here we report that the dispersion of metallic Ni particles into under-coordinated two-dimensional Ni clusters over γ-Mo2N is a thermodynamically favorable process based on the AIMD simulation. A Ni-4nm/γ-Mo2N model catalyst is synthesized and used to further study the reverse sintering effect by the combination of multiple in-situ characterization methods, including in-situ quick XANES and EXAFS, ambient pressure XPS and environmental SE/STEM etc. The under-coordinated two-dimensional layered Ni clusters on molybdenum nitride support generated from the Ni-4nm/γ-Mo2N has been demonstrated to be a thermally stable catalyst in 50 h stability test in CO2 hydrogenation, and exhibits a remarkable catalytic selectivity reverse compared with traditional Ni particles-based catalyst, leading to a chemo-specific CO2 hydrogenation to CO.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

Analysis of the 9th November 1990 flare

2000 ◽  
Vol 179 ◽  
pp. 229-232
Author(s):  
Anita Joshi ◽  
Wahab Uddin
Keyword(s):  
Image Processing ◽  
Two Dimensional ◽  
Temporal Behaviour ◽  
Contour Maps ◽  
Dimensional Measurements ◽  
Processing Software ◽  
Image Processing Software

AbstractIn this paper we present complete two-dimensional measurements of the observed brightness of the 9th November 1990Hαflare, using a PDS microdensitometer scanner and image processing software MIDAS. The resulting isophotal contour maps, were used to describe morphological-cum-temporal behaviour of the flare and also the kernels of the flare. Correlation of theHαflare with SXR and MW radiations were also studied.

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