成因对吉布斯特热转化和水热转化制备的勃姆石的机械化学活化和反应活性的影响

Georg Greifzu, Thomas C. Alex, Ansu J. Kailath, Mamoru Senna, Michael Stelter, Rakesh Kumar
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摘要

本文的重点是通过热转化(B-TH)和水热转化(B-HT)合成的勃姆石(γ-AlOOH)的机械活化和反应性。其核心思想是强调样品成因的作用。所使用的样品具有相似的尺寸分布,但在 BET 表面积上存在很大差异,B-TH 和 B-HT 的 BET 表面积分别为 264 和 2.98 m2/g。使用行星磨进行了不同时间的机械活化,最长达 240 分钟。在研磨过程中,B-TH 与 B-HT 的理化性质,即几何比表面积、BET 比表面积、非晶化程度、微晶尺寸和宏观应变(AlO4(OH)2 八面体层的〈020〉/堆积方向)的变化跨度更大。文献中报道的 B-TH 的 BET 表面积异常减小在 B-HT 中没有观察到。孔径分布随研磨时间变化的性质为 BET 表面积的对比变化提供了一个合理的解释。样品的宏观应变也显示出相反的符号;B-TH 为负号,其特点是层间结合相对较弱。根据碱的浸出性和波美度降低到 γ-Al2O3 转化温度的情况,对样品的反应性进行了评估。一般来说,B-TH 的反应活性高于 B-HT。反应性与物理化学变化相关。尽管反应性差异很大,但反应性的变化可以用相关系数很高的简单多元方程来表示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Influence of Genesis on Mechanochemical Activation and Reactivity of Boehmite Prepared by Thermal and Hydrothermal Transformation of Gibbsite

The focus of this paper is on the mechanical activation and reactivity of boehmite (γ-AlOOH) synthesized by thermal transformation (B-TH) and hydrothermal transformation (B-HT) of the same gibbsite (Al2O3·3H2O) precursor. The central idea is to emphasize the role of sample genesis. The samples used had similar size distribution and largely differed in their BET surface area, 264 and 2.98 m2/g for B-TH and B-HT, respectively. Mechanical activation was carried out for different durations, up to 240 minutes, using a planetary mill. On milling, the span of change in physicochemical properties, namely geometric specific surface area, BET specific surface area, degree of amorphization, microcrystalline dimension, and macro strain (in 〈020〉/stacking direction of AlO4(OH)2 octahedra layers) was more for B-TH vis-à-vis B-HT. The anomalous decrease in the BET surface area reported in the literature for B-TH is not observed in B-HT. The nature of alteration in pore size distributions with milling time is used to present a plausible explanation for the contrasting change in BET surface area. The samples also showed the opposite sign for macro strain; a negative sign for B-TH which was characterized by a relatively weaker interlayer bonding. The reactivity of the samples was evaluated in terms of leachability in alkali and the lowering of boehmite to γ-Al2O3 transformation temperature. In general, higher reactivity was observed for B-TH vis-à-vis B-HT. The reactivity was correlated with physicochemical changes. Despite wide differences in reactivity, the change in reactivity could be expressed in terms of simple multivariate equations with high correlation coefficients.

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