Seed-assisted synthesis of TS-1 crystals containing Al with high catalytic performances in cyclohexanone ammoximation

Xue, Yan; Zuo, Guangling; Wen, Yanwei; Wei, Huijuan; Liu, Meng; Wang, Xiangyu; Li, Baojun

doi:10.1039/c8ra10104c

Cited by 19 publications

(6 citation statements)

References 50 publications

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“…Conventionally, TS-1 zeolite (TS-1) has been used as an industrial catalyst to promote the selective oxidation of some organic compounds, such as the hydroxylation of aromatic hydrocarbons [11], the ammoxidation of ketones [12,13], the epoxidation of olefins [14], and the oxidation of saturated alkanes [15]. Recently, TS-1 has been confirmed as a promising photocatalyst in degradation of organic dye contaminants and selective conversion of propylene [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Yang¹,

Zhu

Peng

et al. 2020

Nanomaterials

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TS-1/C 3 N 4 composites were prepared by calcining the precursors with cooling crystallization method and were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), UV-Vis diffuse reflection spectrum (DRS) and nitrogen adsorption-desorption isotherm. The photocatalytic performance of TS-1/C 3 N 4 composites was investigated to degrade Rhodamine B (RhB) under visible light irradiation. The results showed that all composites exhibited better photocatalytic performance than pristine TS-1 and C 3 N 4 ; TS-1/C 3 N 4 -B composite (the measured mass ratio of TS-1 to C 3 N 4 is 1:4) had best performance, with a rate constant of 0.04166 min −1 , which is about two and ten times higher than those of C 3 N 4 and TS-1, respectively. We attributed the enhanced photocatalytic performance of TC-B to the optimized heterostructure formed by TS-1 and C 3 N 4 with proper proportion. From the results of photoluminescence spectra (PL) and the enhanced photocurrent, it is concluded that photogenerated electrons and holes were separated more effectively in TS-1/C 3 N 4 composites. The contribution of the three main active species for photocatalytic degradation followed a decreasing order of ·O 2 − , ·OH and h + . The degradation products of RhB were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS), and the possible photocatalytic degradation pathways were proposed.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Yang¹,

Zhu

Peng

et al. 2020

Nanomaterials

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“…Due to the excellent catalytic oxidation performance with H 2 O 2 under mild conditions, TS-1 attracted much attention in the last three decades. TS-1-catalyzed reactions include alkene epoxidation, [2][3][4][5][6][7][8] aromatics hydroxylation, [9,10] ketone ammoximation, [11][12][13] alkane oxidation, [14,15] and other oxidative reactions. [16][17][18][19] Tetrahedrally coordinated Ti (framework Ti, [TiO 4 ]) is the main active center for selective oxidation in TS-1.…”

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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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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“…Nevertheless, excessive template material is still required, which is difficult to recycle owing to its thermal decomposition (Zhai et al, 2006). Other alternative approaches are based on the use of inexpensive raw materials (Zhou and Wang, 2000;Wang et al, 2012;Xue et al, 2019). As a cheap template, tetrapropylammonium bromide (TPABr) has been widely used in the synthesis of TS-1 zeolite because of its good thermal stability and low price which is only about one third of that of TPAOH.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

et al. 2021

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Developing an effective and low-cost system to synthesize titanium silicalite-1 (TS-1) zeolite is desirable for a range of industrial applications. To date, the poor catalytic activity of the synthesized zeolite due to the low amount of framework titanium and large crystal size is the main obstacle limiting the widespread application of this material. Moreover, a large amount of wastewater is often produced by the existing synthesis process. Herein, a green and sustainable route for synthesizing small-crystal TS-1 with a high fraction of framework Ti was demonstrated via a seed-assisted method using a tetrapropylammonium bromide (TPABr)-ethanolamine hydrothermal system. The influence of the synthesis conditions on the physicochemical properties and catalytic activities of TS-1 was investigated. With the assistance of nanosized S-1 seeds, the incorporation of Ti into the framework of TS-1 was promoted, and the crystallization rate was effectively accelerated. After alkaline etching, the obtained hierarchical TS-1 had higher catalytic activity towards propylene epoxidation with an extremely high turnover frequency of 1,650 h−1. Furthermore, the mother liquid during the hydrothermal reaction could be reused for the next synthesis procedure. Consequently, utilization ratios of both ethanolamine and TPABr exceeding 95% were achieved by recycling the mother liquid. This low-cost approach for reducing wastewater could be easily scaled up to provide a promising synthesis method for the industrial production of TS-1 and other topological zeolites.

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Seed-assisted synthesis of TS-1 crystals containing Al with high catalytic performances in cyclohexanone ammoximation

Abstract: Using aluminosilicate zeolites seeds, Al atoms are introduced into the TS-1 crystals, resulting in high Lbvalue and more acid sites, which improve the catalytic activity in cyclohexanone ammoximation.

Cited by 19 publications

References 50 publications

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C3N4 Composite under Visible Light

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

Synthesis of Low Cost Titanium Silicalite-1 Zeolite for Highly Efficient Propylene Epoxidation

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