在MTO过程中CNT对SAPO-34的结构性质的影响:实验和分子模拟研究
Saeedeh Soheili1, Ali Nakhaei Pour1, Ali Mohammadi1
1Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran.
Journal of molecular graphics & modelling
|June 22, 2023
概括
与碳纳米管 (CNT) 合成的等级氨酸 (SAPO-34) 催化剂显示了改进的甲醇到烯酸 (MTO) 性能. 采用CNT模板的SAPO-34催化剂实现了高乙烯和的选择性和增强的稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 氨酸 (SAPO-34) 是甲醇转化为烯酸 (MTO) 的关键催化剂.
- 优化SAPO-34结构对于提高MTO性能和选择性至关重要.
- 层次结构提供了更好的质量运输特性.
研究的目的:
- 使用混合结构指导剂 (SDA) 系统与碳纳米管 (CNT) 作为二级模板合成分层的SAPO-34催化剂.
- 研究CNT结合对SAPO-34的结构,纹理和催化性能的影响.
- 评估合成的催化剂的MTO性能,重点关注氨酸的选择性和稳定性.
主要方法:
- 使用二甲基胺 (D) 和丁胺 (B) 作为SDAs的热水合成,用CNT作为次要模板.
- 鉴定技术:FT-IR,XRD,FESEM,TEM,EDX,N2物理吸收和NH3-TPD. 这些技术是最重要的.
- 在MTO过程中的催化评估,包括选择性和稳定性测试.
- 吸附同热度和扩散性的理论研究.
主要成果:
- 纳入CNT改善了SAPO-34的层次结构,增加了外部表面积和中等度,同时减少了颗粒大小.
- 采用CNT模板的SAPO-34催化剂表现出增强的MTO性能.
- 用三元模板 (CNT-B-D) 合成的催化剂实现了对乙烯 (49%) 和烯 (34%) 的最高选择性.
- 加CNT改善了SAPO-34样本的催化稳定性.
- 理论研究表明,较高的乙烯扩散率有利于MTO中基于芳香的循环.
结论:
- 碳纳米管有效地作为二级模板来创建分层的SAPO-34结构.
- 与CNT合成的分层SAPO-34催化剂在MTO过程中表现出卓越的性能,特别是在olefin选择性和稳定性方面.
- 了解扩散机制对于优化MTO催化剂设计和预测产品选择性至关重要.
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