Characterization of the Li1-xHxAlO2 system; 0.00 ≤x ≤ 0.90

D. C. Tomczak; S. H. Thong; Kenneth R Poeppelmeier

doi:10.1007/BF00767196

Characterization of the Li_1-xH_xAlO₂ system; 0.00 ≤x ≤ 0.90

D. C. Tomczak, S. H. Thong, Kenneth R Poeppelmeier

Northwestern University

Research output: Contribution to journal › Article

4 Citations (Scopus)

Abstract

The mechanism of cation replacement in the Li_1-xH_xAlO₂; 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 {Mathematical expression} 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 Li_1-xH_xAlO₂;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.

Original language	English
Pages (from-to)	139-146
Number of pages	8
Journal	Catalysis Letters
Volume	12
Issue number	1-3
DOIs	https://doi.org/10.1007/BF00767196
Publication status	Published - Mar 1992

Keywords

Catalysis by LiHAlO
reactions of 2-propanol on LiHAlO
structure of LiHAlO catalyst

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Catalysis

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10.1007/BF00767196

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Tomczak, D. C., Thong, S. H., & Poeppelmeier, K. R. (1992). Characterization of the Li_1-xH_xAlO₂ system; 0.00 ≤x ≤ 0.90. Catalysis Letters, 12(1-3), 139-146. https://doi.org/10.1007/BF00767196

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abstract = "The mechanism of cation replacement in the Li1-xHxAlO2; 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 {Mathematical expression} 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-xHxAlO2;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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AU - Tomczak, D. C.

AU - Thong, S. H.

AU - Poeppelmeier, Kenneth R

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N2 - The mechanism of cation replacement in the Li1-xHxAlO2; 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 {Mathematical expression} 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-xHxAlO2;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.

AB - The mechanism of cation replacement in the Li1-xHxAlO2; 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 {Mathematical expression} 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-xHxAlO2;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.

KW - Catalysis by LiHAlO

KW - reactions of 2-propanol on LiHAlO

KW - structure of LiHAlO catalyst

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