Green and efficient preparation of hollow titanium silicalite-1 by using recycled mother liquid

Liu, Meng; Wei, Huijuan; Li, Baojun; Song, Liya; Zhao, Songzhao; Niu, Congcong; Jia, Chengfei; Wang, Xiangyu; Wen, Yanwei

doi:10.1016/j.cej.2017.08.082

Cited by 61 publications

(35 citation statements)

References 70 publications

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“…This differs from the results obtained by TPAOH solution-treated [34][35][36] or EOA-treated microsized TS-1. [43,44] The absence of hollow confirms that the dissolution of [SiO 4 ] originates from the external surface. Furthermore, recrystallization of [SiO 4 ] rarely occurs, according to the gradual decreased RC and particle size.…”

Section: Treatment With Eoamentioning

confidence: 81%

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Role of Recrystallization in Alkaline Treatment on the Catalytic Activity of 1‐Butene Epoxidation

et al. 2020

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Two alkylol amines, which were ethanolamine (EOA) and triethanolamine (TEOA), were used to posttreat nanosized titanium silicalite‐1 (TS‐1) to improve its catalytic activity for 1‐butene epoxidation. Comparative studies were conducted to clarify the influences of the EOA and TEOA concentrations on the physicochemical properties through detailed characterization. EOA treatment can dissolve the framework Si, [SiO4], on the external surface of TS‐1, generating some macropores. TEOA serves as structure‐directing agent to form MFI topology other than the dissolution of [SiO4], and promotes the recrystallization of [SiO4], forming new TS‐1 particles over the external surface. The two treatments can both improve the catalytic activity of 1‐butene epoxidation, but the samples treated with TEOA exhibit better catalytic stability. This can be attributed to the characteristic recrystallization of [SiO4] in the case of TEOA treatment, stabilizing the structure of TS‐1 and maintaining more framework Ti and intercrystal space.

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Section: Treatment With Eoamentioning

confidence: 81%

“…Alternatively, the posttreatment of microsized TS-1 with EOA has a similar phenomenon to that with TPAOH. [43,44] Some hollows emerge in TS-1 crystals, which may enhance the diffusion property of substrates and improve the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Role of Recrystallization in Alkaline Treatment on the Catalytic Activity of 1‐Butene Epoxidation

et al. 2020

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“…Figure S3(B) shows the absorbance intensity ratio of the peak at 960 cm −1 to that around 800 cm −1 ( I 960 / I 800) of conventional TS‐1 zeolites prepared with a synthesis gel having Si/Ti ratio of 20, 33, 40, 50 and 80. The intensity ratio decreased with the Si/Ti ratio increased, indicated that I 960 / I 800 can represent the content of framework Ti in some degree ,. The relative absorbance intensity ratio ( I 960 / I 800) of the TS‐1‐m, s‐TS‐1‐m(0.1), s‐TS‐1‐m(0.2) and s‐TS‐1‐m(0.3) are 1.75, 2.27, 2.57 and 2.58, respectively.…”

Section: Resultsmentioning

confidence: 96%

“…The reason is that more desilication caused the loss of the neighboring Ti species from the framework of TS‐1 zeolites. Part of the leached framework Ti species would be incorporated into the zeolites framework, the other part would transform into anatase TiO 2 and amorphous Ti species ,, , . The Si/Ti ratios of HTS‐1‐m, s‐HTS‐1‐m(0.1, 0.45), s‐HTS‐1‐m(0.2, 0.45) and s‐TS‐1‐m(0.3, 0.45) measured by XRF are 42.42, 35.32, 33.58 and 32.30, respectively (Table ).…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Hierarchical Titanium‐Rich Titanium Silicalite‐1 Zeolites and the Highly Efficient Catalytic Performance for Hydroxylation of Phenol

et al. 2019

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Improving the framework titanium (Ti) of titanium silicalite-1 (TS-1) zeolites and creating inter-crystalline mesoporosity are two ways to enhance the catalytic properties of TS-1 for hydroxylation of phenol. Most researches only used one of the ways. In this study, we successfully synthesized of hierarchical Titanium-Rich (Ti-rich) TS-1. Ti-rich TS-1 was synthesized in the presence of ammonium carbonate ((NH 4 ) 2 CO 3 ). The framework Ti content of TS-1 zeolites synthesized by different content of (NH 4 ) 2 CO 3 was studied by X-ray fluorescence (XRF), Fourier transform infrared spectra (FTIR) and ultraviolet visible spectra, the framework Ti content was significantly increased by using (NH 4 ) 2 CO 3 as crystallization-mediating agent. The synthesized samples were evaluated in hydroxylation of phenol. When the molar ratio of ammonium carbonate and tetraethyl orthosilicate in the synthesis gel was 0.2, the molar ratio of Si/Ti reached 34.43 and the Ti-rich TS-1 shows the optimum catalytic activity in hydroxylation of phenol. The post-modification with aqueous solution of tetrapropylammonium hydroxide (TPAOH) was used to further improve the diffusion property. Compared with the parent TS-1, the secondary pore volume was all increased. The developed hierarchical Ti-rich TS-1 zeolites were also assessed in hydroxylation of phenol. It was confirmed that hierarchical Ti-rich titanium silicalite-1 zeolites can improve the catalytic activity in phenol conversion considerably.

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Highly stable monolithic titanium silicalite‐1 catalyst for 1‐butene epoxidation

Zuo

Zhang

et al. 2022

AIChE Journal

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A monolithic titanium silicalite-1 (TS-1) catalyst was prepared by coating TS-1 onto a specially designed stainless-steel support. The catalyst was used in 1-butene epoxidation, a strong exothermic reaction, to produce butene oxide in a fixed-bed reactor. Compared with the traditional extruded TS-1, the monolithic catalyst demonstrates excellent catalytic stability and reusability. To understand the reason for this performance, heat conduction behaviors of the monolithic and extruded catalysts were studied and compared. This was accomplished by firstly developing a kinetic model to determine reaction kinetic parameters, and then simulating the temperature distribution within the reactor. It revealed a much lower temperature-rise over the monolithic catalyst than over the extruded catalyst. This study demonstrates that the stainless-steel support of the monolithic catalyst is effective in dissipating high reaction heat of 1-butene epoxidation, thus limits local temperature-rise within the reactor. This inhibits the formation of channel-blocking byproducts and improves the catalytic stability.

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Green and efficient preparation of hollow titanium silicalite-1 by using recycled mother liquid

Cited by 61 publications

References 70 publications

Role of Recrystallization in Alkaline Treatment on the Catalytic Activity of 1‐Butene Epoxidation

Role of Recrystallization in Alkaline Treatment on the Catalytic Activity of 1‐Butene Epoxidation

Synthesis of Hierarchical Titanium‐Rich Titanium Silicalite‐1 Zeolites and the Highly Efficient Catalytic Performance for Hydroxylation of Phenol

Highly stable monolithic titanium silicalite‐1 catalyst for 1‐butene epoxidation

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