Effect of calcination temperature on the properties of the mixed TiO<sub>2</sub>-ZrO<sub>2</sub> oxides and their performance in the dehydration of octadecanol to octadecene

DUAN Ting-ming; XIAO Yong; ZHANG Guo-quan; JIA Li-tao; HOU Bo; LI De-bao

Volume 48 Issue 5

May 2020

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Article Navigation > Journal of Fuel Chemistry and Technology > 2020 > 48(5): 626-631

DUAN Ting-ming, XIAO Yong, ZHANG Guo-quan, JIA Li-tao, HOU Bo, LI De-bao. Effect of calcination temperature on the properties of the mixed TiO2-ZrO2 oxides and their performance in the dehydration of octadecanol to octadecene[J]. Journal of Fuel Chemistry and Technology, 2020, 48(5): 626-631.

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DUAN Ting-ming, XIAO Yong, ZHANG Guo-quan, JIA Li-tao, HOU Bo, LI De-bao. Effect of calcination temperature on the properties of the mixed TiO₂-ZrO₂ oxides and their performance in the dehydration of octadecanol to octadecene[J]. Journal of Fuel Chemistry and Technology, 2020, 48(5): 626-631.

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Effect of calcination temperature on the properties of the mixed TiO₂-ZrO₂ oxides and their performance in the dehydration of octadecanol to octadecene

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2020-01-17
Rev Recd Date: 2020-03-19

Available Online: 2021-01-23

Publish Date: 2020-05-10

Abstract

Abstract

A series of mixed TiO₂-ZrO₂ oxide catalysts used for the dehydration of octadecanol to octadecene were prepared by doping TiO₂ in ZrO₂ and calcining at 350-500 ℃. With the increase of calcination temperature, the amount of Lewis acid sites on the catalyst surface gradually increases. The amount of Lewis acid sites on the catalyst calcined at 450 ℃ is the most, and when the calcination temperature is over 450 ℃, the amount of Lewis acid sites decreases. No Brønsted acid sites are found on the catalysts. The mixed TiO₂-ZrO₂ oxides calcined at temperature below 400 ℃ contain Ti-O-Zr bonds and amorphous structure. The mixed TiO₂-ZrO₂ oxides with calcination temperature above 400 ℃ show monoclinic and tetragonal phases of ZrO₂. The crystalline phase of the metal oxides and amount of the acid sites simultaneously affect the performance of the catalysts. The acid sites on the mixed TiO₂-ZrO₂ oxides with amorphous structure have much higher dehydration activity than those with monoclinic and tetragonal zirconia crystalline phases. The catalyst calcined at 400 ℃ has the highest yield of 1-octadecene.
- fatty alcohol dehydration,
- TiO₂-ZrO₂ mixed oxides,
- α-olefins,
- acid sites

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