1. (Al1−xCrx)4B6O15 (0.08≤x≤0.14): Metal borates catalyze the dehydration of methanol into dimethyl ether
- Author
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Wei Yin, Tao Yang, Rihong Cong, Qiaoqi Li, Guangjia Wang, Jia Xiang, Jing Ju, and Wenliang Gao
- Subjects
Mechanical Engineering ,Inorganic chemistry ,chemistry.chemical_element ,Condensed Matter Physics ,medicine.disease ,Catalysis ,Metal ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,medicine ,General Materials Science ,Thermal stability ,Dimethyl ether ,Methanol ,Dehydration ,Boron ,Space velocity - Abstract
PKU-5 (Al 4 B 6 O 15 ) is potentially a solid acid catalyst, and it possesses an interesting open-framework composed of [AlO 6 ] and [B 2 O 5 ] groups. PKU-5 shows a high thermal stability, while no physical and chemical properties were investigated thus far, because of the difficulty in its synthesis. Cr-stabilized PKU-5 with the formula (Al 1− x Cr x ) 4 B 6 O 15 (0.08 ≤ x ≤ 0.14) can be easily prepared by annealing Cr-doped PKU-1 precursors. XRD and TEM experiments demonstrate Cr 3+ has been successively incorporated into the framework of PKU-5. NH 3 -TPD measurements indicate that the partial substitution of Al 3+ by Cr 3+ leads to a small change of acid sites in total amounts and distributions. Cr-PKU-5 shows a good catalytic activity for methanol dehydration from 300 to 450 °C. Other operation conditions, such as the Cr 3+ content, space velocity of methanol were also discussed in detail to evaluate its catalytic performance.
- Published
- 2015
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