对酸盐在固态体内融入酸盐的计算研究 (II) 乙酸盐到酸盐β的计算研究
Owain T Beynon1, Alun Owens1, Giulia Tarantino2
1Cardiff Catalysis Institute, Cardiff University, Park Place, Cardiff CF10 3AT, Wales, U.K.
概括
这项研究揭示了使用计算方法将锡 (Sn) 插入β (β) 化物中的机制. 它显示了酸如何转化为活跃的酸位,对于可持续的催化是至关重要的,氧气显著帮助了这个过程.
科学领域:
- 计算化学计算化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 添加的焦化物 (Sn-β) 是绿色化学中的有效的易斯酸催化剂.
- 目前的Sn-β合成方法缓慢,需要恶劣的条件,阻碍了工业应用.
- 固态合并 (SSI) 为Sn-β合成提供了一个更快,无溶剂的替代方案.
研究的目的:
- 通过SSI阐明Sn通过β热带石框架的结合的机械步骤.
- 为了研究从Sn(II) 前体中形成活性Sn(IV) 位点的形成.
- 了解反应条件 (如氧和水) 在SSI过程中的作用.
主要方法:
- 采用 ab initio 计算研究,结合周期密度函数理论 (DFT).
- 使用高级嵌入式集群量子/分子力学 (QM/MM) 方法.
- 分析了关键机械步骤的动力障碍,包括连接物转移,化和氧化.
主要成果:
- 从Sn (II) 乙酸前体中识别了容易的转移和连接物解离.
- 乙酸在Sn (II) 上转化为CO2和乙的化发生在低屏障 (1.03 eV) 的情况下.
- 通过H2O2中间体,与H2O介导途径相比,Sn (II) 到Sn (IV) 的氧化受到O2 (0.25和0.26 eV的障碍物) 的显著促进.
结论:
- 这项研究提供了详细的机械洞察力,了解Sn-β热质的SSI合成期间的Sn插入.
- 氧气在有效氧化Sn (II) 到活性Sn (IV) 催化部位中起着至关重要的作用.
- 研究结果支持计算方法的潜力,以指导和优化金属插入热石的自上而下的合成.
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