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Characterization of the Li1−x H x AlO2 system; 0.00 ⩽x ⩽ 0.90

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Abstract

The mechanism of cation replacement in the Li1−x H x AlO2; 0.00 ⩽x ⩽ 0.90 system was investigated with XRD. Examination of the peak position and intensity associated with the 018 and 110 Bragg reflections\((R\bar 3m)\) in a series of partially replaced samples showed that the cation replacement process proceeded by a two phase mechanism. Catalytic characterization of αLiAlO2 with the 2-propanol probe reaction revealed the formation of the condensation products methyl-cyclopentene, 4-methyl-2-pentanone, and 4-methyl-2-pentanol. These products were seen in addition to propylene and acetone. Catalytic characterization of Li1−x H x AlO2;x = 0.90 with 2-propanol showed a significant decrease in condensation activity and no change in the propylene/acetone ratio relative to αLiAlO2. This suggests that the decrease in the amount of lithium eliminated the basic sites necessary for the condensation reactions.

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Authors and Affiliations

  1. Department of Chemistry and Ipatieff Catalytic Laboratory, Northwestern University, 60208, Evanston, IL, USA

    D. C. Tomczak, S. H. Thong & K. R. Poeppelmeier

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  1. D. C. Tomczak
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  2. S. H. Thong
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  3. K. R. Poeppelmeier
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Tomczak, D.C., Thong, S.H. & Poeppelmeier, K.R. Characterization of the Li1−x H x AlO2 system; 0.00 ⩽x ⩽ 0.90. Catal Lett 12, 139–146 (1992). https://doi.org/10.1007/BF00767196

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