Citation: FENG Ru, GAO Xiu-juan, YANG Qi, LI Ming-jie, ZHANG Jun-feng, SONG Fa-en, ZHANG Qing-de, HAN Yi-zhuo, TAN Yi-sheng. Effects of calcination temperature on the catalytic performance of Ti(SO₄)₂/CS for DME direct oxidation to polyoxymethylene dimethyl ethers[J]. Journal of Fuel Chemistry and Technology, ;2021, 49(1): 72-79. doi: 10.1016/S1872-5813(21)60004-X shu

Effects of calcination temperature on the catalytic performance of Ti(SO₄)₂/CS for DME direct oxidation to polyoxymethylene dimethyl ethers

FENG Ru ^1,2 ,
GAO Xiu-juan ^1,2 ,
YANG Qi ^1,2 ,
LI Ming-jie ^1,2 ,
ZHANG Jun-feng ¹ ,
SONG Fa-en ¹ ,
ZHANG Qing-de ^1,3,, ,
HAN Yi-zhuo ¹ ,
TAN Yi-sheng ¹

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
3.
Dalian National Laboratory for Clean Energy, Dalian 116023, China

Corresponding author: ZHANG Qing-de, qdzhang@sxicc.ac.cn
Received Date: 1 August 2020
Revised Date: 1 September 2020

Fund Project: The project was supported by the National Natural Science Foundation of China (21773283, 21373253), CAS Interdisciplinary Innovation Team (BK2018001), the Dalian National Laboratory For Clean Energy (DNL) Cooperation Found, CAS (DNL 201903), the Youth Innovation Promotion Association CAS (2014155) and the Open Project Program of State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University (201624)

Figures(6)

A series of Ti(SO₄)₂/activated carbon spheres (CS) bifunctional catalysts were designed and prepared by impregnation method, and the effect of calcination temperature of the catalysts on direct oxidation of dimethyl ether (DME) to polyoxymethylene dimethyl ethers (DMM_x) was investigated. The results showed that the performance of Ti(SO₄)₂/CS catalysts was closely related to the calcination temperature. The 30% Ti(SO₄)₂/CS catalyst calcined under O₂ atmosphere at 280 ℃ exhibited excellent activity over which the conversion of DME reached 11.7% with the selectivity of DMM₁₋₃ up to 75.8%, wherein, the selectivity of DMM₂₋₃ was over 30%. The texture and surface properties of the catalysts were characterized by SEM, XRD, Raman, TG, NH₃-TPD and XPS. The suitable amount of weak acid sites and redox sites of the Ti(SO₄)₂/CS were beneficial to the direct oxidation of DME to DMM_x. The calcination temperature changed the distribution of functional groups on the surface of CS which then affected the dispersion form of Ti(SO₄)₂. The type and amount of acid centers especially the ratio of weak acid and medium strong acid could also be adjusted, which can lead to different gradients of the surface acidity of the catalyst. The reasonable matching of the acidic and redox sites on the catalyst can evidently promote the growth of C−O chain.
- dimethyl ether,
- direct oxidation,
- polyoxymethylene dimethyl ethers,
- calcination temperature,
- Ti(SO₄)₂/CS
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Effects of calcination temperature on the catalytic performance of Ti(SO4)2/CS for DME direct oxidation to polyoxymethylene dimethyl ethers

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Effects of calcination temperature on the catalytic performance of Ti(SO₄)₂/CS for DME direct oxidation to polyoxymethylene dimethyl ethers