Synthesis of alumina-nitrogen-doped carbon support for CoMo catalysts in hydrodesulfurization process

• 作者: Zhentao Chen Yaxin Liu Jian Chen Yang Zhao Tao Jiang Fangyu Zhao Jiahuan Yu Haoxuan Yang Fan Yang Chunming Xu
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Catalysis,Kinetics and Reaction Engineering
• 页码范围: 392-402
• 页数: 11页
• 语种: 英文

摘要

More stringent environmental legislation imposes severe requirements to reduce the sulfur content in diesel to ultra-low levels with high efficient catalysts.In this paper,a series of CoMo/NDC@alumina cat-alysts were synthesized by combination of the chemical vapor deposition of nitrogen-doped carbon(NDC) using 1,10-phenanthroline and co-impregnation of Mo and Co active components.The optimal cat-alyst with additive of 25％ 1,10-phenanthroline was screened by a series of property characterization and the hydrodesulfrization (HDS) active test.The amount of "CoMoS" active phase of the optimal CoMo/C3 catalyst increased 5.3％ as compared with the CoMo/γ-Al2O3.The introduction of NDC improved the sul-fidation degree of Mo by 21.8％ as compared to the CoMo/γ-Al2O3 catalyst,which was beneficial to form more active sites.The HDS conversion of the NDC supported catalysts are higher than CoMo/γ-Al2O3 whether for the dibenzothiophene (DBT) or 4,6-dimethyl dibenzothiophene (4,6-DMDBT).Further hydroprocessing evaluation with Dagang diesel revealed that the CoMo/C3 catalyst possessed higher HDS property and the removal rate of DBTs in the diesel increased by 4％-11％ as compared to the CoMo/γ-Al2O3 catalyst.