Facile Preparation and Promising Hydrothermal Stability of Spherical γ-Alumina Support with High Specific Surface Area

Abstract

It is of great importance to develop a spherical γ-alumina support with high hydrothermal stability to be used in platinum reforming catalyst processes. The porous pseudo-boehmite powder with a high surface area was first synthesized via a simple separate nucleation and aging steps method, and was then used as a precursor to produce a spherical γ-Al2O3 support via an oil–ammonia column method. The as-synthesized pseudo-boehmite has a substantially greater specific surface area of 336.0 m2·g−1 in comparison with the commercial Sasol boehmite powder (293.0 m2·g−1) from Sasol Chemicals. In addition, the as-prepared spherical γ-Al2O3 support derived from the as-synthesized pseudo-boehmite also possesses a higher specific surface area of 280.0 m2·g−1 compared to the corresponding Sasol sample. Moreover, the as-prepared spherical γ-Al2O3 balls demonstrate a much higher specific surface area of 185.0 m2·g−1 compared with the Sasol sample of 142.0 m2·g−1 after hydrothermal tests at 600 °C, suggesting its promising application in the chemical industry.

Optimization of 3D Printing Parameters for Alumina Ceramic Based on the Orthogonal Test

“…Pseudoboehmite exhibits several unique properties, such as large specific surface area, large pores, a spatial network structure, and the ability to transform into viscous colloids under acidic conditions. Shaping is a crucial step in the preparation of catalysts at the industrial scale, and the shaping processes utilized for pseudoboehmite primarily include kneading-extrusion, drop-solidification, − and rotational granulation . However, the catalyst carriers produced through these shaping methods typically exhibit conventional morphologies such as strips, spheres, rings, trilobes, and honeycombs.…”