Effect of ammonium salt on the distribution of titanium species in  the synthesis of TS-1 zeolites

SHE Hao-hao; DING Guo-qiang; LI Xian-qing; WANG Hong-xing; CAO Dong-bo; ZHU Yu-lei; LI Yong-wang

doi:10.1016/S1872-5813(21)60071-3

Volume 49 Issue 8

Aug. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(8): 1148-1160

SHE Hao-hao, DING Guo-qiang, LI Xian-qing, WANG Hong-xing, CAO Dong-bo, ZHU Yu-lei, LI Yong-wang. Effect of ammonium salt on the distribution of titanium species in the synthesis of TS-1 zeolites[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1148-1160. doi: 10.1016/S1872-5813(21)60071-3

Citation:

SHE Hao-hao, DING Guo-qiang, LI Xian-qing, WANG Hong-xing, CAO Dong-bo, ZHU Yu-lei, LI Yong-wang. Effect of ammonium salt on the distribution of titanium species in the synthesis of TS-1 zeolites[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1148-1160. doi: 10.1016/S1872-5813(21)60071-3

Citation:

SHE Hao-hao, DING Guo-qiang, LI Xian-qing, WANG Hong-xing, CAO Dong-bo, ZHU Yu-lei, LI Yong-wang. Effect of ammonium salt on the distribution of titanium species in the synthesis of TS-1 zeolites[J]. Journal of Fuel Chemistry and Technology, 2021, 49(8): 1148-1160. doi: 10.1016/S1872-5813(21)60071-3

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Effect of ammonium salt on the distribution of titanium species in the synthesis of TS-1 zeolites

doi: 10.1016/S1872-5813(21)60071-3

SHE Hao-hao^{1, 2
,},
DING Guo-qiang³,
LI Xian-qing³,
WANG Hong-xing^{1, 2},
CAO Dong-bo^{1, 3},
ZHU Yu-lei^{1, 3
,
,},
LI Yong-wang^{1, 3}

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.
Synfuels China Co. Ltd, Beijing 101407, China

Funds: The project was supported by the National Key Research and Development Program of China (2018YFB1501602)

Received Date: 2021-01-25
Rev Recd Date: 2021-03-03

Available Online: 2021-03-25

Publish Date: 2021-08-31

Abstract

Abstract

Titanium silicalite (TS-1) zeolites with different distribution of Ti species were synthesized through altering different amounts of (NH₄)₂SO₄ as crystallization-mediating agent. The distribution of titanium species of TS-1-X samples (X represents the molar ratio of (NH₄)₂SO₄ to SiO₂) was systematically investigated via ICP-AES, FT-IR, UV-Vis, UV-Raman and other techniques. The TS-1-X zeolite samples were applied in the epoxidation of 1-hexene reaction. It was found that the appropriate amount of ammonium salt not only facilitated the enrichment of titanium species from liquid phase to solid phase and promoted the incorporation of Ti into the MFI skeleton, but also resulted in the formation of uniformly small TS-1 crystals due to the inhibition of rapid growth of crystals. However, much more amounts of (NH₄)₂SO₄ led to the formation of extra-framework Ti, including anatase TiO₂ and amorphous Ti species. Meanwhile it promoted the rapid growth of grain resulting in larger TS-1 crystals. Ti-rich TS-1 sample synthesized with molar ratio of (NH₄)₂SO₄ to SiO₂of 0.2 exhibited higher conversion of 1-hexene (42 %) and effective utilization of H₂O₂ (81.8 %). In addition, the effect of ammonium salt’s composition on the properties of TS-1 was investigated by experiments and characterizations. It was found that ammonium salt could regulate the process of crystallization through its own anion and changing PH of the synthesis gel.
- α-olefin,
- titanosilicate zeolites,
- 1-hexene,
- epoxidation

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References(38)

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