合成气制富含异构烷烃的掺杂分子筛钴基催化剂开发研究  

Development of Zeolite Doped Cobalt Based Catalysts for Producing Isoparaffins from Syngas

作　　者：曹素红 袁坤 Cao Suhong;Yuan Kun(Shanghai Pudong New District Zhouqiao Occupational Safety and Health Office,Shanghai 200120,China)

机构地区：[1]上海浦东新区舟桥职业安全健康事务所,上海200120

出　　处：《山东化工》2024年第18期66-68,80,共4页Shandong Chemical Industry

摘　　要：采用共沉淀法先制备出Co/ZrO_(2)催化剂前驱体。经喷雾干燥成型后,再利用水热法将高水热稳定性的H-ZSM-5分子筛原位生长在球形Co/ZrO_(2)催化剂前驱体上,制备出掺杂分子筛Co/ZrO_(2)-H-ZSM-5催化剂。XRD表征显示掺杂分子筛后,Co_(3)O_(4)的特征峰仍然保留且晶粒尺寸并未因掺杂而变化,并出现明显的H-ZSM-5特征峰。BET测试显示由于掺杂分子筛,其比较面积随掺杂量增加而提高。HRTEM表征结果显示规则晶体形貌的H-ZSM-5分子筛吸附在Co/ZrO_(2)催化剂上。H_(2)-TPR与NH_(3)-TPD测试结果则显示,由于掺杂H-ZSM-5分子筛,导致还原度小幅降低,但是提高了催化剂酸性位强度。固定床费托合成催化性能评价结果也显示,由于掺杂酸性H-ZSM-5分子筛,CO加氢生成的长链碳氢化合物会在分子筛上裂解,异构化,进而提高异构烷烃的选择性。Co/ZrO_(2)catalyst precursor was prepared by coprecipitation method.After spray drying,stable H-ZSM-5 zeolite was grown on the spherical Co/ZrO_(2)catalyst precursor by hydrothermal method,and Co/ZrO_(2)-H-ZSM-5 catalyst was prepared after calcination.XRD characterizations showed that the characteristic peak of Co_(3)O_(4)remain and the particle size did not change after doping,and the characteristic peak of H-ZSM-5 appeared obviously.BET characterization showed that surface area increased with the increase of doped zeolite content.HRTEM results illuminated that H-ZSM-5 zeolite with regular morphology adsorbed on Co/ZrO_(2)catalysts.Testing results of H2-TPR and NH_(3)-TPD showed that doped H-ZSM-5 zeolite resulted in a slight reduction in the reducibility but an increase in the acid site strength of the catalyst.The results of catalytic performance evaluation of Fischer-Tropsch synthesis in the fixed-bed reactor also showed that the longer chain hydrocarbons produced by CO hydrogenation was cracked and isomerized in the acidic H-ZSM-5 zeolite,and thus improved the selectivity of isoparaffins.

关 键 词：费托合成 钴基催化剂 异构烷烃 选择性 

分 类 号：TQ529.2[化学工程—煤化学工程]