Phase transformation optimization from boehmite to γ-Al2O3 and duplex microstructure: γ-/δ-Al2O3 to enhance the catalytic applications of 3D-printed scaffolds
Year: 2025
Type: article
Abstract: Direct Ink Writing (DIW) was used to fabricate ceramic scaffolds with tailored geometries and porosity for catalytic applications. The thermal conversion of boehmite (AlOOH) to γ -alumina ( γ -Al₂O₃) was studied to optimize sintering for a γ -/ δ -Al₂O₃ duplex microstructure. Ceramic inks (20–35 wt.% solids) with Pluronic F-127® were 3D-printed and treated at 450-600 °C. Complete AlOOH-to- γ -Al₂O₃ transformation occurred at 450 ºC with structural integrity. Scaffolds showed 10-12% shrinkage, porosity, and mechanical properties comparable to Cold Isostatic Pressing. In ethanol dehydration, γ -/ δ -Al₂O₃ scaffolds sintered at 600 ºC achieved ~95% ethanol conversion and higher ethylene yield versus ~10% for γ -Al₂O₃-only scaffolds at 450 ºC.
Source: Journal of Alloys and Compounds
Authors: G. Cruz, F. Quirós, I. Serrano, L. Franco, G. Fargas, J. Llorca, J.J. Roa
Institution: Universitat Politècnica de Catalunya
Language: English
Subfield: Automotive Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,660
Awards: G183288693, G354759427, G3976838300, G523076202
OpenAlex ID: W4413919045