Page 133 - 《精细化工》2022年第2期
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第 39 卷第 2 期                             精   细   化   工                                  Vol.39, No.2
             2022 年 2 月                              FINE CHEMICALS                                  Feb.  2022


              催化与分离提纯技术
                             金属掺杂 TiO 催化剂制备及其催化
                                                     2

                                          合成 N-甲基氧化吗啉



                                                   2
                                                               2
                           李永威       1,2 ,刘建伟 ,李玉波 ,刘   丹                   1,3 ,桂建舟      1,4*
                 (1.  分离膜与膜过程省部共建国家重点实验室,天津市绿色化工过程工程重点实验室,天津工业大学  材
                 料科学与工程学院,天津   300387;2.  山东金英利新材料科技股份有限公司,山东  潍坊  262714;3.  天
                 津工业大学  化学学院,天津  300387;4.  天津工业大学  化学工程与技术学院,天津  300387)


                 摘要:以 H 2 Ti 3 O 7 纳米线为前驱体,通过简单的离子交换和高温焙烧两步制备了具有不同金属掺杂的 yM/TiO 2
                 催化剂(M=Fe、Co、Ni,y=0.25%、0.75%、1.25%、1.75%、2.25%,y 表示金属 M 的质量百分比)。通过 XRD、
                 SEM、TEM、XPS 对催化剂进行了表征,考察了 yM/TiO 2 催化剂在以 H 2 O 2 为氧化剂催化氧化 N-甲基吗啉(NMM)
                 合成 N-甲基氧化吗啉(NMMO)反应中的催化性能。结果显示,掺杂的金属元素均匀分散在制备的 TiO 2 纳米
                 线基体表面,yM/TiO 2 催化剂形貌为纳米线/纳米棒。当掺杂的金属 Fe 含量为 1.75%时,催化剂表面缺陷氧含量
                 高达 16.86%,催化性能最佳,在反应温度为 35 ℃、反应 3 h 后 NMMO 产率达到 97.5%,表明金属离子的掺入
                 造成 TiO 2 晶体结构中局部晶格扭曲,导致催化剂表面形成较多的氧空位,提升了催化活性。
                 关键词:yM/TiO 2 ;掺杂;N-甲基氧化吗啉;催化氧化;选择性;催化技术
                 中图分类号:TQ032.4      文献标识码:A      文章编号:1003-5214 (2022) 02-0337-08



                      Preparation of metal-doped TiO 2 catalysts and their application
                                  in synthesis of N-methylmorpholine-N-oxide


                                                      2
                                         1,2
                                                               2
                                                                         1,3
                              LI Yongwei , LIU Jianwei , LI Yubo , LIU Dan , GUI Jianzhou 1,4*
                 (1. State Key Laboratory of Separation Membranes  &  Membrane Processes,  Tianjin Key Laboratory of Green
                 Chemical  Technology and Process Engineering, School of Material Science and Engineering, Tiangong University,
                 Tianjin 300387, China; 2. Shandong Jinyingli New Material Technology Co., Ltd., Weifang 262714, Shandong, China; 3.
                 School of Chemistry, Tiangong University, Tianjin 300387, China; 4. School of Chemical Engineering and Technology,
                 TianGong University, Tianjin 300387, China)
                 Abstract: yM/TiO 2 catalysts (M=Fe, Co, Ni, y = 0.25%, 0.75%, 1.25%, 1.75%, 2.25%, y is mass percent of
                 metal M) with different metal-doped were prepared using H 2Ti 3O 7 nanowires as precursors by simple ion
                 exchange and high temperature calcination, and characterized by XRD, SEM, TEM and XPS. The catalytic
                 performance of  yM/TiO 2 catalysts in the  synthesis  of  N-methylmorpholine (NMM) to
                 N-methylmorpholine-N-oxide (NMMO). The results showed that  the doped metal elements were evenly
                 dispersed on the surface of the prepared TiO 2 nanowire matrix. yM/TiO 2 catalysts were in the forms of
                 nanowire/nanorod morphology. When the doped metal Fe content was 1.75%, the surface defect oxygen
                 content of the catalyst was as high as 16.86%, and the catalytic performance was the best. The yield of
                 NMMO reached 97.5% after reaction at 35 ℃  for 3 h, indicating that the doping of metal ions caused the
                 distortion of local lattice in the TiO 2 crystal structure, resulting in the formation of more oxygen vacancies
                 on the catalyst surface and improved the catalytic activity.
                 Key words: yM/TiO 2; doping; NMMO; catalytic oxidation; selectivity; catalysis technology


                 收稿日期:2021-10-09;  定用日期:2021-12-02; DOI: 10.13550/j.jxhg.20211023
                 基金项目:国家自然科学基金项目(21576211);天津市科技发展计划项目(21ZYJDJC00100)
                 作者简介:李永威(1984—),男,博士生,E-mail:lyw1102@126.com。联系人:桂建舟(1973—),男,教授,E-mail:
                 guijianzhou@tiangong.edu.cn。
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