Pd/ZSM-5/MCM-41催化剂加氢脱硫性能研究

doi:10.6023/A17010031

化学学报 ›› 2017, Vol. 75 ›› Issue (5): 479-484.DOI: 10.6023/A17010031 上一篇下一篇

研究论文

Pd/ZSM-5/MCM-41催化剂加氢脱硫性能研究

杨晓东^a, 王新苗^a, 高善彬^a,b, 王安杰^c

a. 中国石油石油化工研究院大庆 163714;
b. 中国石油大学理学院重质油加工国家重点实验室北京 102249;
c. 大连理工大学精细化工国家重点实验室大连 116012

投稿日期:2017-01-20 发布日期:2017-02-23
通讯作者: 杨晓东 E-mail:xiaodongyang1983@126.com
基金资助:
项目受中国石油天然气股份公司基金项目（Nos.2013E-1502，2014B-2508）资助.

Hydrodesulfurization Performances of Pd Catalysts Supported on ZSM-5/MCM-41 Composite Zeolite

Yang Xiaodong^a, Wang Xinmiao^a, Gao Shanbin^a,b, Wang Anjie^c

a. Petrochemical Research Institute, CNPC, Daqing 163714, China;
b. College of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing, Beijing 102249, China;
c. State Key Laboratory of Fine Chemical, Dalian University of Technology, Dalian 116012, China

Received:2017-01-20 Published:2017-02-23
Contact: 10.6023/A17010031 E-mail:xiaodongyang1983@126.com
Supported by:
Project supported by the China National Petroleum Corporation Fund (Nos. 2013E-1502, 2014B-2508).

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摘要/Abstract

本工作将三种材料：全硅MCM-41 （Si-MCM-41）、通过机械混合Si-MCM-41和HZSM-5得到的Z-MCM-41-M、通过在HZSM-5外部包覆Si-MCM-41制备得到的Z-MCM-41，采用XRD、N₂吸附-脱附、NH₃-TPD、Py-IR手段进行了表征.分别以这些材料为载体，制备出负载型贵金属Pd催化剂，以二苯并噻吩（DBT）为模型化合物，在固定床反应器上进行加氢脱硫（HDS）性能考察.反应结果表明，载体的表面积或分散程度并不是影响负载型Pd催化剂HDS性能的关键性因素，催化剂的HDS性能受到载体的孔尺寸和载体的酸性双重影响.负载在酸性载体上表现出较好的HDS性能和加氢选择性，与溢流氢有关.其中，在三种催化剂中，Pd/Z-MCM-41催化剂表现出最高的HDS活性和优异的加氢活性，说明在载体的介孔孔道结构中引入微孔的酸中心对提高加氢脱硫活性有重要影响，仅靠机械混合方式制备的载体不能将介孔的孔道优势与微孔的酸性优势表现出来，不能产生较好的协同催化作用，具有介孔孔道结构和适中酸性的Z-MCM-41复合材料是潜在的贵金属加氢脱硫催化剂载体.

关键词: MCM-41, ZSM-5, 复合分子筛, Pd, 加氢脱硫

Siliceous MCM-41 (Si-MCM-41), two micro-mesoporous materials obtained either by physically mixing Si-MCM-41 with HZSM-5 zeolite (Z-MCM-41-M) or by coating Si-MCM-41 over HZSM-5 zeolite particles (Z-MCM-41), were prepared and characterized by means of XRD, N₂ adsorption-desorption, pyridine adsorbed FT-IR. The hydrodesulfurization (HDS) performances of the supported Pd catalysts thereof, were evaluated with dibenzothiophene (DBT) as the model sulfur-containing molecule. The close relationship between the surface area of the support and the HDS performance for the supported Pd catalysts was not observed. The result indicated that the surface area of the support or the dispersion of the catalyst might not be the key parameter affecting the HDS performance of the supported Pd catalyst. However, the HDS performances of Pd catalysts were significantly influenced by the pore structures and acid properties of the supports. Pd catalysts supported on the acidic supports showed the enhancement of HDS and hydrogenation activities that was thought to be the effect of hydrogen spillover. Among the catalysts studied, Pd/Z-MCM-41 exhibited the highest HDS activity and excellent hydrogenation activities. The results demonstrated that mesoporous materials introducing to microporous zeolite was beneficial to the improvement of HDS activities, but only physically mixing Si-MCM-41 with HZSM-5 zeolite couldn't show the combination advantage of pore of mesoporous materials and acid properties of microporous zeolite, and further generate better synergistic catalytic action. Z-MCM-41 composite material with the regular structure and uniform distribution acidity was potential carriers for precious metal catalysts.

Key words: MCM-41, ZSM-5, composite zeolite, Pd, hydrodesulfurization

引用此文

杨晓东, 王新苗, 高善彬, 王安杰. Pd/ZSM-5/MCM-41催化剂加氢脱硫性能研究[J]. 化学学报, 2017, 75(5): 479-484.

Yang Xiaodong, Wang Xinmiao, Gao Shanbin, Wang Anjie. Hydrodesulfurization Performances of Pd Catalysts Supported on ZSM-5/MCM-41 Composite Zeolite[J]. Acta Chim. Sinica, 2017, 75(5): 479-484.

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Pd/ZSM-5/MCM-41催化剂加氢脱硫性能研究

Hydrodesulfurization Performances of Pd Catalysts Supported on ZSM-5/MCM-41 Composite Zeolite

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