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Influence of Structure and Electronic Properties of Ni-Zn Bimetallic Catalysts for Acetylene Semi-Hydrogenation
| Content Provider | Semantic Scholar |
|---|---|
| Author | Spanjers, C. |
| Copyright Year | 2013 |
| Abstract | The catalytic semi-hydrogenation of acetylene to produce ethylene is a common method for the removal of trace acetylene (~1%) in ethylene feed streams destined for ethylene polymerization. Acetylene impurities in ethylene produced from naphtha can cause deactivation of the polymerization catalyst if not removed from ethylene prior to polymerization. An effective catalyst for this reaction converts all of the acetylene to ethylene without further converting any ethylene to ethane such that there is a net increase in the amount of ethylene. Well-dispersed Pd supported on metal oxides exhibits high activity for acetylene removal, but limited selectivity and long-term stability. Pd-Ag alloys, and more recently, intermetallic Pd-Ga compounds 1 , demonstrate high selectivity towards ethylene and long-term stability. Improved selectivity is a result of isolation of active Pd hydrogenation sites which reduces the ability of the catalyst to over hydrogenate to form ethane, produce oligomerization products, and form coke on the catalyst surface. Recent efforts have demonstrated that intermetallic NiZn may be a suitable replacement for Pd-based catalysts based on DFT calculations and experimental validation. 2 Replacing precious metal Pd-based catalysts with base metal Ni-based catalysts would be highly beneficial in terms of cost. We report on the catalytic selectivity of unsupported bulk intermetallic Ni-Zn catalysts for acetylene semihydrogenation. Bulk intermetallic Ni-Zn catalysts contain little structural and compositional variance, a property that is not easily attainable with supported catalysts. Co-impregnation synthesis of Ni-Zn catalysts using nickel and zinc nitrates results in the formation of ZnO, which remains after hydrogen treatment at 450°C. There are no reports that demonstrate intermetallic NiZn formation using a co-impregnation technique. Thus, we provide the first report on the catalytic properties of intermetallic NiZn for acetylene semi-hydrogenation though the use of a bulk synthesis technique. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://nam.confex.com/data/extendedabstract/nam/2013/Paper_9081_extendedabstract_2201_0.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
