Title

Synthesis, Modification and Characterization of Supported Gold Catalysts for Selective Hydrogenation of Acetylene in Presence of Ethylene

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Chemistry

Date of Award

Fall 2014

Abstract

The selective hydrogenation of acetylene is an industrial process to remove traces of acetylene in ethylene stream for polyethylene production. Titania supported gold catalysts are prepared by two different methods: impregnation (IM) and deposition precipitation with urea (DPU). 5%Au/TiO2 catalysts are obtained by IM, DPU (W) and DPU (S) respectively and tested for selective hydrogenation of acetylene in presence of large excess of ethylene. The activity of supported gold catalysts depends on method of preparation. Catalysts prepared by IM post washed with NH3 have shown higher acetylene conversion, selectivity and yield when compared to catalysts prepared by DPU (W) and DPU(S). However, IM method involves controlling the halide impurities during the preparation. Non- thermal RF plasma is an effective way to modify and enhance the activity of the catalysts. Catalysts prepared by IM, DPU (W) and DPU (S) have shown increase in activity when treated with H2 plasma. Pulse CO chemisorption measurements are performed on gold catalysts which are prepared by IM and DPU methods with different pretreatment conditions. The results of CO chemisorption of the catalysts are related with the activity of the catalysts.

Advisor

Ben W. L. Jang

Subject Categories

Chemistry | Physical Sciences and Mathematics

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