Acta Chimica Sinica ›› 2024, Vol. 82 ›› Issue (5): 493-502.DOI: 10.6023/A23100474 Previous Articles     Next Articles

Article

氮改性ZnO-ZrO2/SBA-15催化剂的酸碱性与其催化乙醇合成1,3-丁二烯反应性能的关系

薛冰a, 关伟鑫a, 王鹏a, 侯少文a, 陈欣辉a, 王奕星a, 苟焕其a, 郭锋浩a, 王梦闯a, 王天姿a, 刘金德a, 郑洲b, 柴寿根b, 陈家锐b, 张建林c, 棘云飞c, 倪珺a,*()   

  1. a 绿色化学合成技术国家重点实验室培育基地 浙江工业大学 杭州 310014
    b 浙江普康化工有限公司 开化 324302
    c 嘉兴南洋万事兴化工有限公司 嘉兴 314201
  • 投稿日期:2023-10-28 发布日期:2024-04-02
  • 基金资助:
    国家自然科学基金(22078301); 国家自然科学基金(21875220)

Relationship between the Acid-base Properties of Nitrogen-modified ZnO-ZrO2/SBA-15 Catalysts and Their Catalytic Performance in the Synthesis of 1,3-Butadiene from Ethanol

Bing Xuea, Weixin Guana, Peng Wanga, Shaowen Houa, Xinhui Chena, Yixing Wanga, Huanqi Goua, Fenghao Guoa, Mengchuang Wanga, Tianzi Wanga, Jinde Liua, Zhou Zhengb, Shougen Chaib, Jiarui Chenb, Jianlin Zhangc, Yunfei Jic, Jun Nia()   

  1. a State Key Laboratory of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014
    b Zhejiang Bulk Chemical Co., LTD., Kaihua 324302
    c Jiaxing Nanyang Wanshixing Chemical Co., LTD., Jiaxing 314201
  • Received:2023-10-28 Published:2024-04-02
  • Contact: *E-mail: junni@zjut.edu.cn
  • Supported by:
    National Natural Science Foundation of China(22078301); National Natural Science Foundation of China(21875220)

1,3-Butadiene (hereinafter referred to as butadiene), as an important organic intermediate in the chemical industry, has a wide range of uses in the petroleum and rubber industries. Using ethanol as raw material to produce butadiene can solve the non-renewable problem of raw materials, so it has received more and more attention. In this paper, catalysts were hydrothermally synthesized by using SBA-15 as the support, nitrate as the oxide precursor, and nitrogen-containing organic compounds as the additive. And then, the relationship between catalytic performance (ethanol conversion and butadiene yield) and the acid-base properties of catalysts was explored in the synthesis of butadiene from ethanol. Specifically, we used melamine (M), cyanuric acid (Ma), 1,10-phenanthroline (Pm), imidazole (Im), and 1,3,5-triazine (St) as nitrogen-containing additives for the preparation of Zn-Zr/SBA-15+X catalysts. Through the activity evaluation of the catalysts, the activities of ethanol dehydrogenation and dehydration, acetaldehyde condensation, and Meerwein-Ponndorf-Verley (MPV) reactions were calculated. Then, by analyzing the dependence of these activities and butadiene yield on the acidity and basicity (the strength and number of acidic/basic sites) of catalysts, we found that appropriate amounts of weak acid (0.022 mmol·g−1), moderate acid (0.078 mmol·g−1), moderate base (0.055 mmol·g−1), and strong base (0.056 mmol·g−1) are helpful for the ethanol dehydrogenation, whereas excess amount of weak acid and moderate acid will lead to the ethanol dehydration. Appropriate amounts of moderate acid (0.078 mmol·g−1) and moderate base (0.055 mmol·g−1) will favor the acetaldehyde condensation and MPV reactions. The butadiene yield is closely related to the activities of acetaldehyde condensation and MPV. The melamine-modified catalyst (Zn-Zr/SBA-15+M) has the optimum amounts of weak acid, moderate acid, moderate base, and strong base in accordance with the above quantities, resulting in the best catalytic performance: 99.5% conversion of ethanol, 65.5% selectivity of butadiene, and 0.45 gBD·gcat−1·h−1 of butadiene productivity.

Key words: nitrogen modification, ZnO-ZrO2, acid-base property, ethanol, butadiene