Nickel Complexes Immobilized in Modified Ionic Liquids Anchored in Structured Materials for Ethylene Oligomerization
| Autor: | Roberto F. de Souza, Marcelo Luis Mignoni, Camila A. Busatta, Katia Bernardo-Gusmão |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Ethylene
β-zeolite Inorganic chemistry MCM-41 010402 general chemistry lcsh:Technology 01 natural sciences oligomerization Catalysis lcsh:Chemistry nickel chemistry.chemical_compound β-diimine Adsorption Desorption General Materials Science ionic liquid heterogenized lcsh:QH301-705.5 Instrumentation Fluid Flow and Transfer Processes Mobil Composition of Matter lcsh:T 010405 organic chemistry Process Chemistry and Technology General Engineering lcsh:QC1-999 0104 chemical sciences Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 chemistry lcsh:TA1-2040 Ionic liquid lcsh:Engineering (General). Civil engineering (General) Selectivity lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 8, Iss 5, p 717 (2018) Applied Sciences; Volume 8; Issue 5; Pages: 717 |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app8050717 |
| Popis: | This work describes the study of ethylene oligomerization reactions catalyzed by nickel-β-diimine complexes immobilized on β-zeolite, [Si]-MCM-41 (Mobil Composition of Matter 41) and [Si,Al]-MCM-41 modified with an ionic liquid. XRD and N2 adsorption and desorption analyses were used to characterize the modified supports—namely, IL-Zeoβ, IL-MCM-41 and IL-Al-MCM-41—and the data showed that material organization remained intact even after incorporation of ionic liquid. N2 adsorption and desorption analyses suggested that ionic liquid can be confined in pores of support materials. Catalytic properties of synthesized materials were tested under different conditions. The following parameters were varied: Al/Ni molar ratio, temperature, pressure and catalyst loading. The homogeneous catalysts were more active but less selective in ethylene oligomerization, relative to heterogeneous ones, which can be attributed to the effect of confinement suffered by catalyst within channels of the support materials. NiIL-Zeoβ complexes were active, with activities greater than 23 s−1 and selectivities higher than 80% for butenes, including more than 85% of 1-butene. On the other hand, the NiIL-MCM-41 system was less active than NiIL-Zeoβ complexes, with activities above 1 s−1 with 100% selectivity for butenes (96% in 1-butene). NiIL-Al-MCM-41 system was more active than NiIL-MCM-41 system and showed an activity of 2.3 s−1 with 90% selectivity in 1-butenes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|