A Study on the Effects of Additives on Selective Hydrogenation of Trace Acetylene Over Palladium Catalysts
Title | A Study on the Effects of Additives on Selective Hydrogenation of Trace Acetylene Over Palladium Catalysts PDF eBook |
Author | Yeung Ho Park |
Publisher | |
Pages | 410 |
Release | 1991 |
Genre | Acetylene |
ISBN |
Selective Hydrogenation of Trace Acetylene in Ethylene Over Pd-Cu Alumina Catalysts
Title | Selective Hydrogenation of Trace Acetylene in Ethylene Over Pd-Cu Alumina Catalysts PDF eBook |
Author | Vinayan Nair |
Publisher | |
Pages | 404 |
Release | 1983 |
Genre | Acetylene |
ISBN |
Selective Hydrogenation of Acetylene Over Pd, Au, and PdAu Supported Nanoparticles
Title | Selective Hydrogenation of Acetylene Over Pd, Au, and PdAu Supported Nanoparticles PDF eBook |
Author | Michael Walker |
Publisher | |
Pages | |
Release | 2013 |
Genre | University of Ottawa theses |
ISBN |
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.
Selective Hydrogenation of Acetylene Over Modified Palladium Catalysts
Title | Selective Hydrogenation of Acetylene Over Modified Palladium Catalysts PDF eBook |
Author | Arash Mirjalili |
Publisher | |
Pages | 196 |
Release | 2016 |
Genre | Acetylene |
ISBN |
Selective Hydrogenation of Acetylene in the Presence of Ethylene Over Supported Pd and Pd-Mg Catalysts
Title | Selective Hydrogenation of Acetylene in the Presence of Ethylene Over Supported Pd and Pd-Mg Catalysts PDF eBook |
Author | Ying Ji |
Publisher | |
Pages | 94 |
Release | 2009 |
Genre | Acetylene |
ISBN |
Effect of Alumina Grinding on the Properties of Alumina Supported Palladium Catalysts in Selective Hydrogenation of Acetylene
Title | Effect of Alumina Grinding on the Properties of Alumina Supported Palladium Catalysts in Selective Hydrogenation of Acetylene PDF eBook |
Author | |
Publisher | |
Pages | 190 |
Release | 2008 |
Genre | Acetylene |
ISBN |
In this study, the effects of alumina grinding and mixed oxides (ZnO-Al2O3 and NiO-Al2O3) grinding with various Zn/Al and Ni/Al molar ratios (0.1 and 0.5) prepared by an attrition ball mill on catalytic performance of alumina supported Pd catalysts for selective hydrogenation of acetylene were investigated. It was found that catalytic performances of the Pd catalyst supported on Al2O3 milled for 12 h were superior compared to those of Pd-supported on the unmilled Al2O3. However, all the catalysts prepared from milled mixed oxides presented lower acetylene conversion and ethylene selectivity than that of the catalyst prepared from alumina milled for 12 h. From X-ray diffraction, it was suggested that varying milling time directly affected the crystallite size, surface area and acidity of alumina supports. As revealed by CO chemisorption, milling of Al2O3 supports could increase metal active sites of Pd/Al2O3 catalysts without change in the interaction between Pd and the alumina support so that the catalysts exhibited higher acetylene activity and ethylene selectivity. Moreover, increasing of acidity affected coke formation on the catalysts.
Selective Hydrogenation of Acetylene Over Palladium on Ionic Liquid Loaded Silica Support
Title | Selective Hydrogenation of Acetylene Over Palladium on Ionic Liquid Loaded Silica Support PDF eBook |
Author | Ting Zhou |
Publisher | |
Pages | 164 |
Release | 2012 |
Genre | Acetylene |
ISBN |