Innovative sol-gel routes to mesoporous bifunctional catalysts for the upgrading of bioethanol to butadiene
(2022) Solgel2022 — Location: Lyon, France (24.July.2022)
Files
solgel2022-abstract-Dochain_Debecker.pdf
Open Access - Adobe PDF
- 243.79 KB
Details
- Authors
- Abstract
- Bioethanol production has been promoted by strong political and incentives and is technologically sound. In parallel, butadiene is one of the compounds that is expected to suffer future shortage due to the shift towards shale gas from the traditional steam cracking of naphtha. Therefore, intensive research is currently conducted towards the direct catalytic conversion of ethanol to butadiene. The reaction is long known, and consists of a complex network of dehydration and dehydrogenation reactions catalysed respectively by acid and redox active sites that must operate in a controlled and balanced fashion to maximize the butadiene yield.1 In the highly versatile toolbox of sol-gel chemistry, non-hydrolytic sol-gel (NHSG) is particularly effective to synthesize mesostructured materials with tailored properties (texture, homogeneity, surface chemistry) and has already shown its potential to obtain effective catalysts.2-4 Here, NHSG was used to prepare bifunctional Ta-Cu-SiO2 catalysts via the acetamide elimination route (“Ac”) and compare them with similar compositions obtained through the ether route (“Et”). Both pathways yielded mesoporous materials (Figure 1A; SSA≈600 m2 g–1; Vp≈0.1 mL g–1; Dp≈4.0 nm for the acetamide elimination route, SSA≈700 m2 g–1; Vp≈0.02 mL g–1; Dp≈7.0 nm for the ether route), with similar CuO crystallite size of around 20 nm. IR spectroscopy and XPS pointed to a successful Ta incorporation inside the silica matrix. The catalysts obtained through the acetamide elimination route perform systematically better than those synthesized by the ether route (Figure 1B). After optimization of the Cu and Ta loading, the best formulation (Ac-2Ta4Cu) reached an ethanol conversion of 75 % and a butadiene selectivity of 50 %.
- Affiliations
Citations
Dochain, D. D., Styskalik, A., & Debecker, D. (2022). Innovative sol-gel routes to mesoporous bifunctional catalysts for the upgrading of bioethanol to butadiene. Solgel2022, Lyon, France. https://hdl.handle.net/2078.5/25221