Hydrogenation Catalysts From Intermetallic Compounds
DOWNLOAD
Download Hydrogenation Catalysts From Intermetallic Compounds PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Hydrogenation Catalysts From Intermetallic Compounds book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Hydrogenation Catalysts From Intermetallic Compounds
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1982
Hydrogenation Catalysts From Intermetallic Compounds written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Catalysts categories.
Hydrogenation Catalysts From Intermetallic Compounds
DOWNLOAD
Author : Gary B. Atkinson
language : en
Publisher:
Release Date : 1982
Hydrogenation Catalysts From Intermetallic Compounds written by Gary B. Atkinson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
A Knowledge Based Approach
DOWNLOAD
Author : Marc Armbrüster
language : en
Publisher:
Release Date : 2012
A Knowledge Based Approach written by Marc Armbrüster and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
A Study Of Some Intermetallic Compounds In Connection With The Catalytic Hydrogenation Of Carbon Monoxide
DOWNLOAD
Author : John Earl France
language : en
Publisher:
Release Date : 1982
A Study Of Some Intermetallic Compounds In Connection With The Catalytic Hydrogenation Of Carbon Monoxide written by John Earl France and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Carbon monoxide categories.
Synthesis Characterization And Catalytic Testing Of Palladium And Nickel Based Intermetallic Compounds For Acetylene Semi Hydrogenation
DOWNLOAD
Author : Anish Dasgupta
language : en
Publisher:
Release Date : 2019
Synthesis Characterization And Catalytic Testing Of Palladium And Nickel Based Intermetallic Compounds For Acetylene Semi Hydrogenation written by Anish Dasgupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Intermetallic compounds often offer opportunities for synthesis of site isolated catalysts having precise active site coordination and morphology. They are also resistant to segregation effects (compared to random alloys) because of the high heat of formation of their unique electronically stabilized crystal structures. Due to predictable, periodic and easily reproducible nature of the isolated active sites, suitably chosen intermetallic compounds can act as excellent model systems for studying catalytic structure function correlation in different small molecule chemistries. In the current dissertation I utilized H2-D2 exchange in addition to ethylene and acetylene hydrogenation as the probe reactions of choice. My ultimate target is to understand and quantify the effect of active site (transition metal) isolation during the semi-hydrogenation of acetylene in an ethylene rich stream, which is a key step in industrial polyethylene synthesisa multi-hundred-billion-dollar industry. I studied two different classes of catalysts for this chemistry: Pd-(M)-Zn (M=Cu, Ag, Au) -brass intermetallics and Ni-Ga intermetallics. I used micron scale bulk materials as model catalysts because they provide greater compositional control and allows for studying the intrinsic catalytic property of the intermetallic, free from support and ligand effects.A significant part of the text is dedicated to the synthesis, characterization and catalytic study of the bulk Pd-(M)-Zn ternary -brass phase materials because of its unique adaptability in terms of developing a family of closely related model catalysts having Pd-M-Pd active sites (M=Pd, Zn, Au, Cu and Ag) which can change the semi-hydrogenation activity and selectivity by two orders of magnitude even when only one atom is changed per 52 atom unit cell. As an extension of this project I also report several Pd-Ni-Zn and Pd-Pt-Zn ternary -brass phases and determine their atomic site occupancy factors.During the course of my research I realized there were no reported methods for synthesizing Pd-Zn and Ni-Zn -brass intermetallics as catalytically relevant supported nano-particles (NPs). I developed and optimized a hybrid generalized synthesis approach for SiO2 supported Pd-Zn, Ni-Zn and Cu-Zn -brass NPs. I also provide preliminary evidence that this approach can be easily extended to the synthesis of ternary NPs as well.In the case of Ni-Ga intermetallics, I tried to understand the role of Ga in controlling acetylene semi-hydrogenation. I observed a reversal in the ethylene selectivity trend with Ga content between 85 C and 160 C which is unexpected based on published DFT calculations. Previously, it has been suggested that Ga simply acts as a spacer for isolating Ni/Pd active sites much like Zn in the case of Ni-Zn catalysts (studied by Charles Spanjers from our research group). However, Ga has a higher affinity to hydrogen compared to Zn and I attempted to investigate if Ga may have a weak but non-negligible catalytic contribution towards hydrogenation which has typically not been previously considered in any detail in the case of acetylene semi-hydrogenation on metallic catalysts. Additionally, I provide understanding behind the high acetylene semi-hydrogenation selectivity of Ni5Zn21 catalyst which was originally reported by Spanjers et al. (J. Catal. 2014). This involved identifying the site occupation factor of Ni and Zn in the -brass lattice for materials having greater than 15.4 at% Ni. It is determined that (unlike Pd-Zn -brass) exactly single atom Ni1 active sites are exposed on the surface irrespective of the Ni concentration (even though Ni3 clusters are present in the bulk) which explains the suppression of over-hydrogenation and oligomerization on this catalyst, resulting in the high ethylene selectivity reported by Spanjers et al.
Rare Earth Intermetallic Compounds As Catalysts For The Hydrogenation Of Carbon Monoxide
DOWNLOAD
Author : Victoria Tan Coon
language : en
Publisher:
Release Date : 1977
Rare Earth Intermetallic Compounds As Catalysts For The Hydrogenation Of Carbon Monoxide written by Victoria Tan Coon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Platinum Intermetallic Compounds As Heterogeneous Catalysts For The Hydrogenation Of Unsaturated Aldehydes
DOWNLOAD
Author : E. Galloway
language : en
Publisher:
Release Date : 2009
Platinum Intermetallic Compounds As Heterogeneous Catalysts For The Hydrogenation Of Unsaturated Aldehydes written by E. Galloway and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Rare Earth Intermetallic Compounds As Catalysts For The Hydrogenation Of Carbon Monoixde
DOWNLOAD
Author : Victoria Tan Coon
language : en
Publisher:
Release Date : 1977
Rare Earth Intermetallic Compounds As Catalysts For The Hydrogenation Of Carbon Monoixde written by Victoria Tan Coon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
I Intermetallic Compounds Of Alkali Metals With Noble Metals
DOWNLOAD
Author : Franklin Maurice Boyden
language : en
Publisher:
Release Date : 1962
I Intermetallic Compounds Of Alkali Metals With Noble Metals written by Franklin Maurice Boyden and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with categories.
Nickel Zinc Intermetallic Catalysts For Acetylene Semi Hydrogenation And X Ray Absorption Spectroscopy Techniques For Catalyst Characterization
DOWNLOAD
Author : Charles Spanjers
language : en
Publisher:
Release Date : 2015
Nickel Zinc Intermetallic Catalysts For Acetylene Semi Hydrogenation And X Ray Absorption Spectroscopy Techniques For Catalyst Characterization written by Charles Spanjers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The development of new catalytic materials to improve the activity and selectivity of catalytic reactions is an ongoing task for researchers due to the continual demand for cheaper, more energy efficient methods to produce both new and existing products. This dissertation focuses on developing base-metal catalysts for selective hydrogenation reactions. In particular, Ni-Zn intermetallic compounds (which are ordered arrangements of these two elements) are utilized for the selective semi-hydrogenation of acetylene, which is a high-volume industrial reaction that currently requires the use of precious metal catalysts. The poor catalytic properties of pure Ni are greatly improved through the addition of a second base metal, Zn, making the Ni-based catalysts behave more like precious metals. While we cannot perform alchemy, turning two base metals into an intermetallic material that behaves like a precious metal might be the closest we can come. The synthesis of well-defined materials and corresponding kinetic measurements utilizing isotopic labeling are combined with density functional theory calculations to highlight the reasons for the enhanced selectivity of Ni-Zn intermetallic catalysts. In situ structure-determination during catalyst synthesis helps to lay the framework for future intermetallic catalyst development. Developing new catalytic materials requires detailed knowledge of catalyst structure, because structure is related to function. New characterization methods that have the ability to provide better descriptions of catalysts have the potential to be used in many sub-fields of catalysis. To address this need, this dissertation also focuses on new catalyst characterization techniques using X-ray absorption spectroscopy. We use differential X-ray absorption fine structure to monitor the Ar-induced surface restructuring of Pd nanoclusters at 77 K, highlighting the ability of this technique to probe surface atoms of Pd nanoclusters. Furthermore, we use X-ray absorption near edge structure to identify second-shell coordination in Ti-based transition metal complexes.