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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Photochemical cyclodehydrogenation reactions / by C.P. Joshua.

Joshua, Chittoor Philip January 1967 (has links)
Typescript / 127 leaves, 3 reprints : ill. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / The photochemical reactions of benzalaniline and other substituted Schiff bases in 98% sulphuric acid were examined. Benzalaniline was found to undergo photochemical cyclohydrogenation to phenanthridine and simultaneous reduction to N-benzylaniline. Substituted Schiff bases, however, did not undergo photochemical cyclization; and possible causes of the photochemical stability of these compunds are discussed. / Thesis (Ph.D.)--University of Adelaide, Dept. of Organic Chemistry, 1967

Study of catalytic alcohol dehydration

Wach, Steven Thaddeus 05 1900 (has links)
No description available.

Characterization of a catalyst regeneration process for metals fouled CoMo/Al[subscript]2O[subscript]3 catalysts

Hiltzik, Laurence Howard 05 1900 (has links)
No description available.

The catalytic dehydrogenation of butane in fluidized beds

Bracale, Sergio 08 1900 (has links)
No description available.

Catalytic dehydrogenation of butenes in the presence of steam

Beckberger, L. H. January 1946 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1946. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 241-243).

Kinetics of catalytic dehydrogenation of normal butane

Hummel, Harry H. January 1948 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1948. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [103]-104).

Catalytic dehydrogenation of n-butane

Dodd, Robert Henry, January 1945 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1945. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 159-160).

Variables affecting activity of molybdena-alumina hydroforming catalyst in aromatization of cyclohexane

Rudershausen, Charles Gerald Joseph, January 1952 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1952. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [152]-154).

Vapour phase dehydrogenation of cyclohexane on microstructured reactors

Mpuhlu, Batsho January 2012 (has links)
The work that is described in this thesis forms part of the research and development projects at InnoVenton: NMMU Institute of Chemical Technology in collaboration with Sasol Technologies. The broader view of the project was testing on the so-called “Small Production Platforms” (SPP’s). In particular the main aim of this study was to investigate the effect of micro-structuring on the heterogeneous catalysed, vapour-phase oxidative dehydrogenation of cyclohexane in the presence of air. Ground work studies were done to provide a proper comparison of the micro-structured reactor with a traditional fixed-bed reactor. These included evaluation of a proper vanadium pyrophosphate catalyst for the reaction, testing of reaction parameters for the oxidative dehydrogenation reaction on a fixed-bed reactor and lastly comparing the performance of the micro-structured reactor to that of the fixed-bed reactor Various vanadium pyrophosphate catalysts that were tested for activity included: bulk (VO)2P2O7, bulk (VO)2P2O7 promoted with Fe, (VO)2P2O7 supported on -Al2O3 and Fe promoted (VO)2P2O7 supported on -Al2O3. These catalysts showed significant differences in TOF, however it was not conclusive from the results whether these differences may be traced to increased activity for dehydrogenation for different catalysts since all reactions were run under conditions of oxygen deficiency. It is, however, clear that Fe promotion significantly increase activity, irrespective of the relative degrees of oxidative dehydrogenation and normal dehydrogenation. The Fe promoted catalyst was further tested for long term stability in-view of using it as the catalyst in the micro-structured reactor. These studies showed the catalyst to have a high degree of stability with minimal structural changes under the reaction conditions used. Various response surface models describing the variation in each of the cyclohexane conversion, cyclohexene selectivity, and benzene selectivity, respectively when changing reaction condition, were derived by means of multiple regression. To obtain some idea of the degree and nature of the normal dehydrogenation reaction, the amount of deficit oxygen was estimated from the measured results for cyclohexane conversion and cyclohexene and benzene selectivities. These estimated values were also modelled as described above. The regression models were used to interpret specific trends in the responses for the oxidative dehydrogenation of cyclohexane and account for the oxygen deficit in the system. The performance of a fixed bed tubular reactor (FBR) and micro-structured sandwich reactor (MSSR) were compared over an Fe promoted vanadium pyrophosphate. Reactor performance was evaluated by varying specific reaction conditions (temperature and space velocity). Subsequently the turn-over frequencies, conversion and selectivities from the two reactors were compared. The conversion achieved in the micro-structured reactor was observed to be significantly higher than that achieved in the fixed-bed reactor at all reaction parameters. This is despite the fact that the total amount of catalyst in the micro-structured reactor is approximately 5 times less than that used in the fixed bed reactor. In addition, the contact time (1/MHSV) in the micro-structured reactor is also significantly shorter than in the fixed-bed reactor.

Preparation and characterization of halide-doped perovskite-type catalysts for oxidative dehydrogenation of ethane.

January 2001 (has links)
by Chan Ying. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references. / Abstracts in English and Chinese. / Abstract --- p.i / 摘要 --- p.iii / Acknowledgements --- p.iv / Table of contents --- p.v / List of Tables --- p.ix / List of Figures --- p.xii / Chapter Chapter 1 --- Introduction / Chapter 1.1 --- Introduction --- p.1 / Chapter 1.2 --- Literature review of the ODE reaction over different catalysts --- p.4 / Chapter 1.2.1 --- The alkali metal and the alkaline earth metal oxide catalysts --- p.4 / Chapter 1.2.2 --- Rare earth oxide catalysts --- p.5 / Chapter 1.2.3 --- Transition metal oxide catalysts --- p.6 / Chapter 1.3 --- Perovskite-type oxide catalysts --- p.7 / Chapter 1.3.1 --- The structure of perovskites oxide --- p.7 / Chapter 1.3.2 --- Preparation method of perovskites oxide --- p.8 / Chapter 1.3.3 --- Literature review of perovskites oxide catalysts --- p.9 / Chapter 1.4 --- ODE mechanism --- p.11 / Chapter 1.5 --- Factors affecting the catalytic performance of catalysts --- p.12 / Chapter 1.6 --- surface and bulk characterization of perovskites-type oxide catalysts --- p.13 / Chapter 1.7 --- Objective of this research project --- p.15 / Reference --- p.15 / Chapter Chapter 2 --- Instrumentation / Chapter 2.1 --- Introduction --- p.20 / Chapter 2.2 --- Assessment catalytic performance --- p.20 / Chapter 2.3 --- "Brunauer, Emmett and Teller (BET)" --- p.23 / Chapter 2.3.1 --- Theory --- p.23 / Chapter 2.3.2 --- Experimental --- p.25 / Chapter 2.4 --- X-ray Diffraction (XRD) --- p.25 / Chapter 2.4.1 --- Theory --- p.25 / Chapter 2.4.2 --- Instrumentation --- p.26 / Chapter 2.5 --- X-ray Photoelectron Spectroscopy (XPS) --- p.28 / Chapter 2.5.1 --- Basic principles --- p.28 / Chapter 2.5.2 --- Qualitative analysis --- p.29 / Chapter --- Chemical shift peaks --- p.29 / Chapter --- Auger peaks --- p.30 / Chapter --- Shake-up satellites --- p.30 / Chapter 2.5.3 --- Quantitative analysis --- p.31 / Chapter --- Surface sensitivity and sampling depth --- p.31 / Chapter --- Atomic concentration determination --- p.31 / Chapter 2.5.4. --- Instrumentation --- p.32 / Chapter --- Ultra-high Vacuum --- p.32 / Chapter --- Sample Introduction System --- p.33 / Chapter --- X-ray Source --- p.33 / Chapter --- Data processing --- p.34 / Chapter 2.6 --- O2-Temperature Programmed Desorption (02-TPD) --- p.37 / Chapter 2.7. --- Halogen Analysis --- p.37 / Chapter 2.7.1 --- The Determination of Chloride by Fajans Method --- p.37 / Chapter 2.7.2. --- The Determination of Fluoride Content by ISE Fluoride Electrode --- p.38 / Chapter 2.8. --- The Determination of Mn Concentration --- p.38 / Reference --- p.39

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