Development of sol-gel catalysts by use of fast combinatorial synthesis and high throughput testing techniques for catalytic oxidation of propylene to propylene oxide

Download

index.pdf

Date

2010

Author

Düzenli, Derya

Metadata

Show full item record

Item Usage Stats

284
views

96
downloads

Propylene oxide (PO) is an important raw material for the chemical industry, which is produced commercially by the chlorohydrin process and hydroperoxide process. However the deficiencies in these processes have given rise to considerable interest in the development of a direct route to PO that does not produce by-products or coproducts. The development of novel, active and selective catalysts for gas phase oxidation of propylene using molecular oxygen were studied via testing a large number of catalysts by high-throughput screening method over combinatorially prepared different catalytic system in this study. v The promoted and un-promoted silver (Ag), copper (Cu), manganese (Mn) mono and bimetallic catalytic system over high and low surface area silica, alumina, titanium oxide and titanium-silicate supports were prepared by single step sol-gel method and by incipient wetness method. The study to determine the most effective catalyst and promoter in the epoxidation reaction with different reaction conditions, showed that potassium (K)- promoted Cu metal supported over high surface area silica favored the PO production at a high reaction temperature (350 °C) and oxygen rich atmosphere (C3H6/O2=1.0). The catalyst showed high and low propylene oxide productivity was investigated by some of the characterization techniques. The highlydispersed copper particle over silica support was determined by XRD, TEM and XPS techniques. The only change between promoted and un-promoted catalyst was found out in the temperature dependence of propylene consumption and PO production rate. It was inferred that potassium (K) only neutralizes the acid sites of silica.

Subject Keywords

Propylene oxide., Chemical kinetics.

URI

http://etd.lib.metu.edu.tr/upload/12612675/index.pdf
https://hdl.handle.net/11511/20051

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Application of density functional theory to propylene to propylene oxide catalytic reaction Onay, Deniz; Önal, Işık; Fellah, Mehmet Ferdi; Department of Chemical Engineering (2015) Current propylene oxide production highly relies on costly and environmentally disadvantageous processes. Direct propylene epoxidation on heterogeneous surface is desired to replace these processes. With this ultimate goal in mind, propylene epoxidation has been investigated on Cu2O(001) and RuO2(110) surfaces. Different elementary steps of the reaction mechanism that result in propylene oxide formation are analyzed on these catalytic models by using Density Functional Theory (DFT) calculations via Vienna A...
Development of a synthetic strategy for Water soluble tripodal receptors: Two novel fluorescent receptors for highly selective and sensitive detections of Fe3+ and Cu2+ ions and biological evaluation USLU, AYLİN; Ozcan, Elif; TÜMAY, SÜREYYA OĞUZ; Kazan, Hasan Huseyin; YEŞİLOT, SERKAN (Elsevier BV, 2020-04-01) A general synthetic strategy is developed to synthesize water soluble receptors by employing tripodal system based on a cyclotriphosphaze platform. The developed model is successfully synthesized and characterized by using elemental analysis, FT-IR, MALDI-TOF, H-1 NMR, C-13 NMR and P-31 NMR techniques. The fluorescence sensing performance of prepared water soluble tripodal systems were evaluated by UV/Vis and fluorescence spectroscopies. According to obtained results, two novel water-soluble sensing platfor...
Dissolution of colemanite and crystallization of gypsum during boric acid production in a batch reactor Erdoğdu, Anıl; Eroğlu, İnci; Department of Chemical Engineering (2004) One of the most commonly used boron compounds, boric acid, is produced by dissolving colemanite (2CaO₉3B2O3₉5H2O) in aqueous sulfuric acid whereby gypsum (CaSO4₉2H2O) is formed as a byproduct and must be separated from the main product. This process consists of two steps, dissolution of colemanite and formation of gypsum. The amount of boric acid formed depends on the first step, dissolution of colemanite. In the latter step, gypsum crystals are formed and stay in the reaction mixture to grow up to a size l...
Study of adsorption characteristics of long chain alkyl amine and petroleum sulfonate on silicates by electrokinetic potential, microflotation, FTIR, and AFM analyses ÖZÜN, Savaş; Atalay, M. Umit; Demirci, Şahinde (Informa UK Limited, 2019-05-19) The long-chain alkyl amines and petroleum sulfonates are mostly used to remove unwanted minerals from feldspar ores in acidic pHs. In this study, their adsorption characteristics on pure albite and quartz were investigated by electrokinetic potential measurements, microflotation tests, Fourier transform infrared spectroscopy, and atomic force microscopy studies. According to the results, amine had strong influence on zeta potentials of both albite and quartz turning them positive and resulting over 90% flot...
Propylene epoxidation on CoO and Li promoted CoO catalysts: a density functional theory study Gezer, Miray; Önal, Işık; Department of Chemical Engineering (2014) Propylene oxide is a significant intermediate chemical which has many derivatives used as raw materials in many industries such as automobile, cosmetic, medicine etc. However, its current production methods, chlorohydrin process and hydroperoxide process, are not preferred since they are economically and environmentally disadvantageous. Considering these negative effects, heterogeneous catalyst for direct propylene epoxidation is still being investigated. With an objective of filling this catalyst gap in th...

Citation Formats

D. Düzenli, “Development of sol-gel catalysts by use of fast combinatorial synthesis and high throughput testing techniques for catalytic oxidation of propylene to propylene oxide,” Ph.D. - Doctoral Program, Middle East Technical University, 2010.