Title

Selective Hydrogenation of Acetylene Over Modified Palladium Catalysts

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Chemistry

Date of Award

Summer 2016

Abstract

For the past decades, the polyethylene industry has been very important due to its growing use in everyday materials and devices. Selective hydrogenation of acetylene, which is found as an impurity in ethylene streams, is a crucial industrial process to remove traces of acetylene for the polyethylene industry. A series of modified catalysts were prepared on different supports and then were tested for selective hydrogenation reactions comparing to mono metallic Pd catalysts as the reference; the feed gas is ~1% acetylene in balance ethylene with additional hydrogen for a H2:C2H2 ratio of 3:1. Characterization techniques such as H2 – TPR, TGA – DTGA, HAADF – STEM, in – situ FTIR, UV – Vis spectroscopy as well as H2 pulse chemisorption techniques were applied to confirm the formation of single atom alloy catalysts and explaining the reaction results. In addition, alpha phase alumina (α – Al2O3), exhibited better conversion and selectivity over gamma alumina. Ceria promoted catalysts showed promising catalytic activity even though the loading of the promoter was very low.

Advisor

Ben W. - L Jang

Subject Categories

Chemistry | Physical Sciences and Mathematics

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