Selective Hydrogenation of Acetylene Using a Ag/Pd Zeolite During the Conversion of Methane in a DC Plasma Reactor PDF Download
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Author: Christopher L. Gordon
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :
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Author: Christopher L. Gordon
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :
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Author: American Chemical Society. Committee on Professional Training
Publisher:
ISBN:
Category : Biochemistry
Languages : en
Pages : 1932
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Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.
Author: Christopher Lynn Gordon
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 418
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Author: Wei Huang
Publisher: ProQuest
ISBN: 9780549408819
Category : Acetylene
Languages : en
Pages :
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Author: Wei Huang
Publisher:
ISBN: 9780542458330
Category : Hydrogenation
Languages : en
Pages :
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New catalysts have been developed by combining Pd-based bimetallic catalysts and zeolite supports to achieve higher selectivity for the selective hydrogenation of acetylene in a stream containing excess ethylene at relatively low temperatures (300-339K). Low-temperature hydrogenation offers the opportunity of using competitive adsorption to achieve preferential hydrogenation of acetylene. Previous work for this has found that bimetallic catalysts favor low temperature hydrogenation. Results from many other groups have also shown that Pd is a good catalyst for the selective hydrogenation of alkynes in excess ethylene. Therefore the strategy of the present work was to modify Pd catalysts and embed bimetallic particles in an environment that is highly selective for acetylene hydrogenation. Cation-pi interaction offers the potential for selective adsorption of acetylene. We used the ion-exchanged zeolite for the support of the bimetallic catalysts. The zeolite structure should have multiple dimensions and contain large pores, in order to house the bimetallic particles inside the pores. In this work, we focus on beta-type zeolites. Flow reactor studies using GC, batch reactor studies using FTIR, and TPR evaluation have been utilized for this project. It was found that the Pd-Ag bimetallic catalyst had a much higher selectivity for acetylene hydrogenation in excess ethylene than either Pd or Ag, while the Pd-Ni bimetallic catalyst behaved similarly to the Pd catalyst. Modeling of reactions in FTIR also showed that there was a small difference in the rate constant and equilibrium constant of Pd/beta-zeolite and Pd-Ni/beta-zeolite. The zeolite support also exhibited enhanced activity for the low temperature hydrogenation of acetylene.
Author: Stephen Claude LeViness
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 500
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Author: Ying Ji
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 94
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Author: Kornthape Prasirtsiriphan
Publisher:
ISBN: 9789746384704
Category :
Languages : en
Pages : 68
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Author: Michael Walker
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages :
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The removal of trace amounts of acetylene in ethylene streams is a high-volume industrial process that must possess high selectivity of alkyne hydrogenation over hydrogenation of alkenes. Current technology uses metallic nanoparticles, typically palladium or platinum, for acetylene removal. However, problems arise due to the deactivation of the catalysts at high temperatures as well as low selectivities at high conversions. Pore expanded MCM-41 is synthesized via a two-step strategy in which MCM-41 was prepared via cetyltrimethylammonium bromide (CTMABr) followed by the hydrothermal treatment with N,N-dimethyldecylamine (DMDA). This material was washed with ethanol to remove DMDA, or calcined to remove both surfactants. PE-MCM-41 based materials were impregnated with palladium, gold, and palladium-gold nanoparticles. The removal of DMDA had an effect on both the conversion and selectivity, in which they were found to drop significantly. However, by using the bimetallic PdAu catalysts, higher selectivity could be achieved due to increased electron density.
Author: Vinayan Nair
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 404
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