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Dissertations / Theses on the topic 'Heteropoly Acid'

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Published: 4 June 2021
Last updated: 26 July 2025

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1

Llewelyn, Peter William. "Supported heteropoly acids for acid catalysed reactions." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/54120/.

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2

Devassy, B. M. "Acid catalysis using zirconia-supported Keggin heteropoly acids." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2005. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2465.

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3

Kaur, Jaspalne. "Friedel-Crafts acylation catalysed by heteropoly acids." Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272747.

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4

Alsalme, Ali Mohammed. "Solid acid catalysts based on heteropoly acids for conversion of renewable feedstocks." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539488.

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The aim of this work is to investigate homogeneous and heterogeneous catalysis by HPAs for the conversion of renewable feedstocks. This includes the preparation, characterisation and testing of a range of acidic solid materials such as bulk HPAs, CS2.sHo.sPW12040and the acidic composites comprising H3PW12040 (HPW) supported on Nb20s, Zr02 and Ti02. The HPW supported on Ti02, Zr02 and Nb20s were prepared by impregnation method and then characterised regarding their acid properties and the chemical structure of HPA on the catalyst surface, compared to "standard" HPA catalysts such as bulk and si
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5

Obali, Zeynep. "Heteropolyacid Catalysts For Etherification Of Isoolefins." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1134923/index.pdf.

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Due to the water pollution problems created by MTBE, significant research was focused on the production of alternative oxygenates, such as ethyl tert-butyl ether (ETBE), tert-amyl-methyl-ether (TAME) and tert-amyl-ethyl-ether (TAEE) as octane enhancing gasoline blending components. These oxygenates are expected to improve the burning characteristics of gasoline and reduce exhaust emissions of CO and hydrocarbons. Generally, macroreticular acidic resin catalysts (Amberlyst-15) are used for the etherification reactions between C5 iso-olefins (2M1B/2M2B) and alcohols (ethanol/methanol). But in re
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6

Alharbi, W. N. "Dehydration of methanol and ethanol in the gas phase over heteropoly acid catalysts." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3011109/.

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The aim of this thesis is to investigate heterogeneous catalysis for the dehydration of methanol and ethanol at a gas-solid interface over a wide range of solid Brønsted acid catalysts based on Keggin-type heteropoly acids (HPAs), focussing on the formation of dimethyl ether (DME) and diethyl ether (DEE), respectively. The dehydration of methanol to dimethyl ether (DME) was studied over a wide range of bulk and supported HPAs and was compared with the reaction over HZSM-5 zeolites (Si/Al = 10−120). Turnover rates for these catalysts were measured under zero-order reaction conditions. The HPA c
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7

Dailo, Mark Paul Jimena. "Catalytic Activity of Heteropoly Tungstophosphoric Acid supported on Partially Reduced Graphene Oxide Prepared by Laser and Microwave Irradiation." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3671.

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The solid acid catalyst of the Keggin-type 12-tungstophosphoric acid (H3PW12O40, HPW) is supported on partially reduced graphene oxide (PRGO) nanosheets for acid-catalyzed reactions. HPW is a new class of catalyst with a good thermal stability and high Bronsted acidity in order to replace common mineral acids. However, it has low specific surface area (1-5 m2/g). Therefore, the possibility of PRGO as a catalytic support for HPW is investigated due to its high surface area (2630 m2/g) and good thermal stability. The synthesis of HPW-GO catalyst is prepared using microwave and laser irradiation
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8

Varisli, Dilek. "Kinetic Studies For Dimethyl Ether And Diethyl Ether Production." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608731/index.pdf.

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Fast depletion of oil reserves necessitates the development of novel alternative motor vehicle fuels. Global warming problems also initiated new research to develop new fuels creating less CO2 emission. Nowadays, dimethyl ether (DME) and diethyl ether (DEE) are considered as important alternative clean energy sources. These valuable ethers are produced by the dehydration reaction of methanol and ethanol, respectively, in the presence of acidic catalysts. Besides DEE, ethylene which is very important in petrochemical industry, can also be produced by ethanol dehydration reaction. In the first p
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9

Kozhevnikova, Elena Fedorovna. "Heteropoly acids as catalysts for Fries reaction." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408540.

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10

Alekar, N. "Catalytic studies involving heteropoly acids and related compounds." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2000. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2283.

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11

Schrotter, Bengü Bozkaya. "The use of heteropoly acids in separation and catalysis." Thesis, University of Bath, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423494.

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12

Rafeletos, Georgios. "Structural and synthetic properties of selected heteropoly acids of molybdenum." Thesis, University of Kent, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324662.

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13

Benaissa, Hacib. "Heteropoly compounds as catalysts for the selective hydrogenation of carboxylic acids to corresponding aldehydes." Thesis, University of Liverpool, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433026.

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14

Oguzer, Ozge. "Screening And Characterization Of Catalytic Composite Membranes For Ethyllactate Production." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605363/index.pdf.

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In this research, molybdophosphoric acid (PMo) was blended with polysulfone polymer (PSF) and form a film catalyst by using a common solvent dimethylformamide (DMF). Kinetic and mass transfer parameters were evaluated for catalytic films in ethanol lactic acid esterification reaction as film surface area, film thickness and catalyst loading were varied at 50&amp<br>#61616<br>C, 1 atm and 1:1 ethyl alcohol to lactic acid mole ratio conditions. Also prepared films were characterized by DSC, TGA, FTIR, X-ray and SEM analysis. It was observed that the catalytic films showed higher activities wit
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15

Vaughan, James Stuart. "Synthesis, characterization and high pressure propene oligomerization over heteropoly acids, SAPO-11 molecular sieves and MeAPSO-11 molecular sieves." Doctoral thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/21991.

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Bibliography: pages 219-232.<br>Heteropoly acids, HPAs, and SAPO-11 and MeAPSO-11 molecular sieves have been proposed to be active for the oligomerization of propene to high quality distillate fuels. In this study these catalysts have been synthesized, characterized, modified and screened for the oligomerization of propene to distillate fuels. Heteropoly acids consist of high molecular weight poly-oxoanions, counter cations and water of hydration and are strongly acidic. The following salts of 12-tungstophosphoric acid, a 12-type HPA with the Keggin anion structure, were synthesized: AI, Fe, C
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16

Zhang, Jizhe. "Biomass Conversion over Heteropoly Acid Catalysts." Diss., 2015. http://hdl.handle.net/10754/552692.

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Biomass is a natural resource that is both abundant and sustainable. Its efficient utilization has long been the focus of research and development efforts with the aim to substitute it for fossil-based feedstock. In addition to the production of biofuels (e.g., ethanol) from biomass, which has been to some degree successful, its conversion to high value-added chemicals is equally important. Among various biomass conversion pathways, catalytic conversion is usually preferred, as it provides a cost-effective and eco-benign route to the desired products with high selectivities. The research of t
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17

You, Wei-Jhu, and 尤偉竹. "Studies on Friedel–Crafts Acylation by Supported Heteropoly Acid Catalysts." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/88776300245375457226.

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碩士<br>龍華科技大學<br>工程技術研究所<br>97<br>Currently among the heterogeneous catalysts used in Friedel-Crafts acylation reactions, the heteropoly acids supported by zeolite or some highly stabe metal oxides are often used. But current methods of preparing supported heteropoly acid catalysts are rather complicated and time-consuming; that is why the supported heteropoly acid catalysts have not been widely used in the industry. In this study, we use the Dry Gel Conversion (DGC) technique combined with the Steam Assisted Conversion (SAC) technique to prepare a series of HPW/SiO2 catalysts by changing prepa
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18

Yu, Chao-Ching, and 游朝晴. "Infrared Spectroscopic Studies of Heteropoly Acid Catalysts and Their Application to Acid Catalyzed Reactions." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/97516962294962858366.

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19

Hou, Chi-Lin, and 侯琦琳. "Simultaneous Determination of Arsenite and Arsenate by Ion Chromatogray with Luminol-Heteropoly Acid." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/55485344055256707378.

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碩士<br>中原大學<br>化學研究所<br>100<br>Arsenic is an element found in the nature and commonly known as a metalloid element. Its common form in the nature is salts with oxidation states of +3 and +5. Despite its toxicity, arsenic is an essential element in our body, whereas in the environment, arsenic is considered a toxic metal and its presence, especially in drinking water, is closely monitored via methods such as inductively-coupled plasma — mass spectrometry detection (ICP-MSD) or atomic absorption spectroscopy (AAS) with hydride generation detection. The goal of this research is to develop a simpl
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20

SUNG, TZU-SHING, and 宋慈馨. "Preparation of Heteropoly acid / Sulfonated Poly(arylene ether sulfone)s Composites Proton Exchange Membranes for Application in Fuel Cell." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/26m774.

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碩士<br>國立雲林科技大學<br>化學工程與材料工程系<br>106<br>In this study, firstly, poly(arylene ether sulfone)s was sulfonated by using fuming sulfuric acid. Secondly, sulfonated poly(arylene ether sulfone)s (SPAES) was prepared by aromatic nucleophilic substitution （SNAr） polycondensation. The degree of sulfonation was controlled by adjusting the percentage of monomers. Then, phosphotungstic acid and tungstosilicic acid were added into SPAES solution in order to synthesize proton exchange membrane by casting. The HPA/SPAES composites membranes possess excellent dimensional stability and high proton conductivity.
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