对催化剂浸过程的磁共振成像研究:在毫米尺寸的玛-Al2O3催化剂体内区分金属离子复合物
Leticia Espinosa-Alonso1, Anna A Lysova, Peter de Peinder
1Inorganic Chemistry and Catalysis group, Department of Chemistry, Faculty of Science, Utrecht University, Sorbonnelaan 16, 3508 TB Utrecht, The Netherlands.
Journal of the American Chemical Society
|April 24, 2009
概括
磁共振成像 (MRI) 在催化剂制备过程中可视化了 (Ni) 前体协调. 这揭示了不同的复合物如何影响化催化剂的马-23的分布.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 分析化学 分析化学
背景情况:
- 基催化剂 (Ni) 在- (gamma-Al(2) O(3) 上对于化反应至关重要.
- 了解前体浸步骤对于控制催化剂性能至关重要.
- 离子协调会影响其在催化剂制备过程中的行为.
研究的目的:
- 通过使用MRI来研究Ni/gamma-Al(2) O(3) 催化剂制备中的浸步骤.
- 为了区分和量化非屏蔽 ([Ni((H(2) O) ((6)) ((2+)) 和屏蔽 ([Ni(edtaH(x)))) ((((2-x) -)) 物种.
- 为了将的物种化与其在催化剂支内的分布相关联.
主要方法:
- 磁共振成像 (MRI) 使用T(2) 和T(1) 对比,可视化不同的物种.
- 定量核磁共振 (MRI) 用于确定[Ni(H(2) O) ((6))) ((2+) 的度分布.
- 结合MRI与紫外线微光谱学进行动态和吸附/脱附分析.
主要成果:
- 磁力共振成像成功地根据其动态区分了非屏蔽和屏蔽复合物.
- [Ni(H(2) O) ((6))) ((2+) 和[Ni(edtaH(x)))) ((2-x)-) 种分别表现出不同的T(2) 和T(1) 放松行为.
- 该研究显示,在玛-Al2O3催化剂体内的分布不均,原因是吸附/脱附现象.
结论:
- 核磁共振是一个强大的工具,用于研究异质催化中的前体浸.
- 的特异性显著影响其分布,导致对工业应用具有潜在优势的不均性.
- 结合MRI和UV视微光谱的方法为催化剂制备过程提供了全面的见解.
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