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Effect of aluminum on the mesoporous materials support of heterogenized Nickel β-diimine in oligomerization reactions
Molecular Catalysis ( IF 4.6 ) Pub Date : 2018-06-02 , DOI: 10.1016/j.mcat.2018.05.026
Enéderson Rossetto , Tatiana Zanette , Rafael Silva da Rocha , Bruna Pes Nicola , Sibele B.C. Pergher , Katia Bernardo-Gusmão

The β-diimine ligand 2-(phenyl)amine-4-(phenyl)imine-2-pentene was combined with the alkoxysilane group CPTMS, covalently anchored to the mesoporous supports (Al-MCM-41 (Si/Al = 15) and Al-SBA-15 (Si/Al = 15) and (Si/Al = 5)) by interaction with the silanol groups of the silica matrix, then complexed with nickel bromide. The Ni-β-diimine/Al-mesoporous materials complexes were synthesized for application in olefin oligomerization reactions, and the results were compared to those obtained of complexes obtained using the mesoporous materials Si-MCM-41 and Si-SBA-15. To confirm the success of the synthesis, the materials were characterized through several techniques such as 1H, 13C and 29Si NMR, small angle XRD, elemental analysis, N2 adsorption and desorption isotherms, transmission electron microscopy and flame atomic absorption spectroscopy. The Ni-β-diimine/Al-MCM-41 complexes are active and selective for ethylene and propylene oligomerization reactions, also showed to be more active for usage in oligomerization reactions of both olefins when compared to complexes obtained using Si-MCM-41. Ni-β-diimine/SBA-15 complexes obtained using pure silica SBA-15, Al-SBA-15 (Si/Al = 15) or Al-SBA-15 (Si/Al = 5) were also applied on ethylene oligomerization reactions. It was observed a significant rise in the catalytic activity with increase of aluminum content. The higher activity was followed by a greater selectivity for short chain oligomers, in this case butenes (mainly 1-butene).



中文翻译:

铝对低聚反应中异质化镍β-二亚胺介孔材料支撑的影响

将β-二亚胺配体2-(苯基)胺-4-(苯基)亚胺-2-戊烯与烷氧基硅烷基CPTMS结合,共价锚定在介孔载体(Al-MCM-41(Si / Al = 15)和Al-SBA-15(Si / Al = 15)和(Si / Al = 5))与二氧化硅基体的硅烷醇基相互作用,然后与溴化镍络合。合成了Ni-β-二亚胺/ Al介孔材料配合物用于烯烃低聚反应,并将结果与​​使用介孔材料Si-MCM-41和Si-SBA-15获得的配合物进行了比较。为了确认合成的成功,通过几种技术对材料进行了表征,例如1 H,13 C和29 Si NMR,小角XRD,元素分析,N 2吸附和解吸等温线,透射电子显微镜和火焰原子吸收光谱。Ni-β-二亚胺/ Al-MCM-41配合物对乙烯和丙烯的低聚反应具有活性和选择性,与使用Si-MCM-41获得的配合物相比,在两种烯烃的低聚反应中也显示出更高的活性。使用纯二氧化硅SBA-15,Al-SBA-15(Si / Al = 15)或Al-SBA-15(Si / Al = 5)获得的Ni-β-二亚胺/ SBA-15配合物也用于乙烯低聚反应。观察到随着铝含量的增加,催化活性显着提高。较高的活性之后是对短链低聚物(在这种情况下为丁烯(主要为1-丁烯))的更大选择性。

更新日期:2018-06-02
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