Improving the performance of TS-1 catalysts for continuous cyclohexanone ammoximation through controlment of active species distribution

Xue, Yan; Xie, Yu; Wei, Huijuan; Wen, Yanwei; Wang, Xiangyu; Li, Baojun

doi:10.1039/c4nj00455h

Cited by 29 publications

(14 citation statements)

References 43 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Actually, the chemical reactions that may occur in this benign process are complicated, such as cyclohexanone ammoximation, summarized in Scheme 1. Thus, for the purpose of constructing more efficient ammoximation processes, numerous efforts have been made, which mainly focus on reaction mechanisms [4][5][6], reaction parameters optimization [4,6,7], preparation and post-treatment of titanosilicates [8,9], and the deactivation and regeneration of catalysts [10][11][12][13]. As a matter of fact, clean production of oxime requires a catalytic system that not only exhibits excellent catalytic activity for ammoximation but also, more importantly, can suppress the undesired reaction pathways simultaneously, as the formation of by-products can strongly affect oxime purity, even in very small quantities.…”

Section: Introductionmentioning

confidence: 99%

Insights into the key to highly selective synthesis of oxime via ammoximation over titanosilicates

Zhuo

Wang

Zhang

et al. 2015

Journal of Catalysis

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Insights into the key to highly selective synthesis of oxime via ammoximation over titanosilicates

Zhuo

Wang

Zhang

et al. 2015

Journal of Catalysis

View full text Add to dashboard Cite

“…The process was similar to that reported in our early work. 26 TS-1 was posttreated according to the report. 26 The powders were modied with EA and TPAB, and 1.0 g of TS-1 raw powder was dispersed in EA and TPAB solution (molar composition of the solution was 1EA : 0.2TPAB : 50H 2 O, 12 mL).…”

Section: Synthesismentioning

confidence: 99%

“…26 TS-1 was posttreated according to the report. 26 The powders were modied with EA and TPAB, and 1.0 g of TS-1 raw powder was dispersed in EA and TPAB solution (molar composition of the solution was 1EA : 0.2TPAB : 50H 2 O, 12 mL). Moreover, two types of zeolites of pure silicon and aluminosilicate with the MFI structure were selected as seeds: nano S-1 (n-S-1) and micro S-1 (m-S-1) and nano ZSM-5 (n-ZSM-5) and micro ZSM-5 (m-ZSM-5).…”

Section: Synthesismentioning

confidence: 99%

“…[23][24][25] However, in our previous study, aer a 420 h continuous reaction for cyclohexanone ammoximation, many defects and caves were found on the surface of the big TS-1 particle, and some amorphous particles appeared on the outside of the TS-1 particles. 26 The dissolution of Si in the basic reaction medium led to a decrease in the catalytic stability. 27 It is still our pursuit to prepare the rather thick TS-1 with high catalytic performances and higher stability.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…high temperature and pressure. Xiangyu Wang [36] also a method that after being modified by ethanolamine, TS-1 exhibited excellent catalytic activity and stability in the continuous cyclohexanone ammoximation. Xiangyu Wang [36] also a method that after being modified by ethanolamine, TS-1 exhibited excellent catalytic activity and stability in the continuous cyclohexanone ammoximation.…”

mentioning

confidence: 99%

Surface-modified TS-1 with enhanced activity for cyclohexanone ammoximation in a Pickering emulsion and increased stability in hot aqueous ammonia

Shen

et al. 2015

RSC Adv.

View full text Add to dashboard Cite

Functional TS-1, partially hydrophobilized with organosilanes, was found more active and stable in Pickering emulsion system. In this work, TS-1 behaved simultaneously as a catalyst and solid emulsifier favoring cyclohexanone ammoximation reaction in organic solvent-free condition. The composition, structure, formed emulsion morphology, surface morphology were characterized by Fourier-transform infrared (FT-IR) spectroscopy, conductometer, optical microscope with high speed CCD camera, Brunauer-Emmett-Teller (BET)，X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It indicated that hydrophobilization provided TS-1 a moderate wettability, allowing the formation of 2 stable Pickering emulsion, thus promoting the performence in catalyzing cyclohexanone/H 2 O 2 /NH 3 •H 2 O reaction system in the absence of organic solvent.What is more, due to alkyl groups grafted to TS-1, the zeolites were comparatively exclusive to aqueous phase and they are more capable to endure severe environment, ie., 200 ºC, under autogenic pressure. 3 ago, has been widely studied for water/oil and oil/water systems [11] . It has a variety use in functional materials, such as capsules [12,13] , Janus particles [14,15] , composite particles [16,17] , and emulsion assemblies [18,19] . The solid particles used in Pickering emulsion formation are multitudinous, such as SiO 2 [20] , Fe 3 O 4 [21] , Polyoxometalate nanoparticles [22] , and kaolin [23] . Things could also happen to catalyst TS-1.Titanium silicate-1 (TS-1) is the preferred catalyst used in ammoximation of cyclohexanone for its orderly channel and unique shape-selective catalytic function.TS-1, first synthesized by Taramosso et al. [24] in 1983, is a typical environmental friendly catalyst. After 1983, TS-1 is synthesize through many ways [25,26] , derived from the classic method of Taramosso's. It is an important catalyst for selective oxidation of a large number of organic substrates, for instance, alkanes, alkenes, alcohols, aromatics and phenol [27][28][29][30][31][32][33] . TS-1 has the potential to act as solid emulsifier, as well, only if it has a moderate wettability.The stability of zeolite plays an extreme important role in catalyst system, however, according to work of Florian's [34] , the framework structure Si-O-Si could been hydrolyzed by hydroxyl ions, especially in harsh environment, e.g. high temperature and pressure. It has been reported that referentially anchoring hydrophobic functionalities on the external surface can effectively prevent direct contact between bulk liquid water and the zeolite, thus preventing the collapse of the framework in hot water [35] . Xiangyu Wang [36] also a method that after being modified by ethanolamine, TS-1 exhibited excellent catalytic activity and stability in the continuous cyclohexanone ammoximation. 7 Modification with OTSIR spectrum is one of the classical methods for structure determination due to its sensitivity to the chemical composition and architecture of molecules. In t...

show abstract

Improving the performance of TS-1 catalysts for continuous cyclohexanone ammoximation through controlment of active species distribution

Cited by 29 publications

References 43 publications

Insights into the key to highly selective synthesis of oxime via ammoximation over titanosilicates

Insights into the key to highly selective synthesis of oxime via ammoximation over titanosilicates

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

Surface-modified TS-1 with enhanced activity for cyclohexanone ammoximation in a Pickering emulsion and increased stability in hot aqueous ammonia

Contact Info

Product

Resources

About