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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.