Olefin oligomerisation over nanocrystalline MFI-based micro/mesoporous zeotypes synthesised via bottom-up approaches

RENEWABLE ENERGY

卷:138

Article

Silva, Andreia F.¹  Fernandes, Auguste²  Antunes, Margarida M.¹  Ribeiro, Maria F.²  Silva, Carlos M.¹  Valente, Anabela A.¹ 

[1] Univ Aveiro, Dept Chem, CICECO Aveiro Inst Mat, Campus Univ Santiago, P-3810193 Aveiro, Portugal

[2] Inst Super Tecn, Ctr Biol & Chem Engn, Inst Biotechnol & Bioengn, Ave Rovisco Pais, P-1049001 Lisbon, Portugal

关键词: 1-Butene;    Oligomerisation;    Continuous-flow;    MFI topology;    Hierarchical zeotypes;    Hydrothermal synthesis;   

DOI  :  10.1016/j.renene.2019.02.019

来源: Elsevier

【 摘 要 】

The oligomerisation of 1-butene was studied under high-pressure continuous-flow conditions (200-250 degrees C, 30-40 bar), in the presence of micro/mesoporous zeotypes based on the MFI topology, which were prepared via different non-destructive bottom-up strategies: crystallization of silanized protozeolitic units; co-templating with a dual function (polymeric) template; and using a sole structure directing agent (non-surfactant and non-polymeric) to generate mesoporosity. The synthesis method influenced the material properties and consequently the catalytic performance. In targeting hydrocarbons with boiling point ranges characteristics of diesel, the zeotypes benefited from regular morphology, reduced crystallite size, mesoporosity and enhanced molar ratio of Lewis (L) to Bronsted (B) acid sites (L/B). In general, the zeotypes outperformed commercial zeolite ZSM-5. The best-performing zeotype was prepared according to the Serrano strategy based on the crystallization of silanized zeolitic seeds, and led to 97% conversion and an average space-time yield of liquid products of 1077 mg g(cat)(-1) h(-1), at 250 degrees C, 40 bar. The zeotypes seemed more stable than the commercial zeolite, based on molecular level characterization studies of the used/regenerated catalysts, with some differences in catalytic activity. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

Free