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Framework Reduction of GeO2 Zeolites During Calcination
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-10-07 00:00:00 , DOI: 10.1021/acs.chemmater.6b03682
Luis A. Villaescusa 1, 2 , Miguel A. Camblor 3
Affiliation  

Calcination in air of GeO2 zeolites with AST-topology causes reduction of the framework, hence structural destruction, in a notable extension. This is due to the impossibility for the organic cation occluded inside to react with ambient oxygen. As the temperature increases, reoxidation in air of the reduced framework causes episodes of weight-gain. When calcination is carried out in N2, weight losses close to 70% imply a loss of Ge due to sublimation of germanium monoxide, GeO. The nature of the organic cation occluded determines the nature and oxidation state of the final residue after calcination in N2: for tetramethylammonium the residue is GeO2 while trimethyl-terc-butylammonium, thanks to its larger C content, yields metallic Ge. Framework organoreduction is not unique to GeO2-AST zeolites but also occurs during the calcination in air of other germanium-containing zeolites with larger pore openings.

中文翻译:

煅烧过程中GeO 2沸石的骨架还原

具有AST拓扑结构的GeO 2沸石在空气中煅烧会导致构架的减少,从而导致结构破坏,并具有显着的扩展性。这是由于内部的有机阳离子不可能与周围的氧气反应的缘故。随着温度升高,还原后的骨架在空气中的再氧化会导致体重增加。当在N 2中进行煅烧时,重量损失接近70%,这意味着由于一氧化锗GeO的升华,Ge的损失。在N 2中煅烧后,所包含的有机阳离子的性质决定了最终残留物的性质和氧化态:对于四甲基铵,残留物为GeO 2,而三甲基叔丁基为GeO 2。丁铵由于其较高的C含量,可产生金属Ge。骨架有机还原不是GeO 2 -AST沸石所独有的,而是在空气中煅烧其他具有较大开孔的含锗沸石的过程中发生的。
更新日期:2016-10-07
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