Abstract: The application results of the second and third generation RHT series catalysts in the 4th -6th run of the RDS unit in Hainan Refining & Chemcial Co., Ltd. were introduced. The third generation RHT series catalysts show its good abilities and stability to remove impurities and carbon residues during 412-day long-term operation. Comparison the results in the fourth, fifth and sixth cycle with the imported catalysts reveals the better activity and stability of the second generation and third generation RHT series residue hydrotreating catalysts.

Key words: residue hydrotreating, RHT series catalyst, carbon residue , desulfurization