Effect of acidity in TS-1 zeolites on product distribution of the styrene oxidation reaction

Zhuang, Jing; Ma, Ding; Yan, Zhimin; Liu, Xiumei; Han, Xiuwen; Bao, Xinhe; Zhang, Yihua; Guo, Xinwen; Wang, Xiangsheng

doi:10.1016/j.apcata.2003.06.002

Cited by 56 publications

(14 citation statements)

References 23 publications

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“…The peak reveals the proof of isolated Ti 4+ species . Generally, it comes from the electronic transfer between isolated tetrahedral-coordinated Ti 4+ cations and oxygen anions . The peak at 250–280 nm is usually assigned to the formation of extra-framework titanium species .…”

Section: Resultsmentioning

confidence: 99%

Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H₂ and O₂

Yuan

Song

Dong

et al. 2021

ACS Appl. Mater. Interfaces

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Hierarchical TS-1 has attracted enormous attention from both academia and industry due to its remarkable catalytic performance in epoxidation reactions. However, sustainable synthesis of hierarchical-nanosized TS-1 without mesoporogens is still challenging. In this work, we report a facile and mesoporogen-free strategy to simultaneously manipulate pore structure and particle size of TS-1 employing the concentrated system. Taking advantage of the suspended nuclei in the concentrated system as confirmed by the DLS-PSD and atomic force microscopy, the novel TS-1 is demonstrated to have higher Ti concentration on surface, higher surface area (539 m 2 /g), abundant mesopores, and reduced crystal size (ca. 150 nm). Moreover, this Au−Ti bifunctional catalyst shows a good PO formation rate with enhanced catalytic stability due to the hierarchical structure. This strategy opens a novel way for the green synthesis of hierarchical-nanosized TS-1 and facilitates industrial development of the Au/TS-1 catalyst for propene epoxidation.

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Section: Resultsmentioning

confidence: 99%

Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H₂ and O₂

Yuan

Song

Dong

et al. 2021

ACS Appl. Mater. Interfaces

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“…This result is in line with the research of Nur et al, (2004) which states that the FTIR-pyridine peak for TS-1 and SO4/TS-1 only appears at the Lewis acid site. The Lewis acid site in TS-1 appeared due to the presence of a tetrahedrally coordinated titanium atom in the TS-1 lattice structure (Nur et al, 2004) and (Zhuang et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Effect of Ag addition into the Activity of Titanium Silicate-1 Catalyst in Cyclohexanone Reaction

Fitasari

Prasetyoko

Suprapto

2021

WJC

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Titanium Silicate-1 (TS-1) has been successfully modified by combining Silver (Ag) metals. In this study, the preparation of Ag/TS-1 was carried out by impregnation method using a solution of silver nitrate (AgNO3) as a precursor to TS-1 with a loading variation of 0.5%, 1%, 2%, and 4%. Impregnation carried out on TS-1 aims to disperse Ag (1) only attached to the surface of TS-1 particles (before calcination/TK) and (2) on the entire surface of TS-1 particles (after calcination/K). The synthesized catalyst was then characterized by X-ray diffraction, infrared spectroscopy, and pyridine adsorption techniques. The XRD pattern shows that all the catalysts have high crystallinity with MFI structure, and there is no other crystalline phase. The infrared spectra showed that the titanium tetrahedral in TS-1 remained after Ag impregnation. The TS-1 and Ag/TS-1 catalysts were analyzed for their surface acidity using pyridine adsorption on the sample. The pyridine adsorption technique showed the presence of Lewis sites on Ag/TS-1. In this study, the presence of Ag loading on the Ag/TS-1 catalyst affected the TS-1 catalytic activity. The amount of cyclohexanone oxime product produced in XAg/TS-1 was more than in Ag/TS-1.

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“…The products separation from the catalyst is a common problem. Thus, it is important to develop heterogeneous catalysts, including molecular sieves doped with transition metals like Ti, Co, V [7][8][9][10][11]. These catalysts can be easily separated from the reaction medium and reused, due to their stability compared to the homogeneous catalysts.…”

Section: Introductionmentioning

confidence: 99%

Study of Two Catalyst Configurations under Microwave Irradiation for the Selective Benzaldehyde Production over Co-ZSM-11 and Fe-ZSM-11

Jury¹,

Polaert

Pierella³

et al. 2015

International Journal of Chemical Reactor Engineering

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Intensification process by the use of microwave heating was investigated by testing two catalyst configurations on the selective styrene oxidation for benzaldehyde production. The oxidation reaction was studied over Co-ZSM-11 and Fe-ZSM-11 catalysts. Their catalytic activity was evaluated by using these catalysts in two different forms: compacted pellets and fine particles. Thus, two reaction systems were studied under microwave: a batch system with fine particles in suspension (system 1) and a recirculating batch liquid through a fixed bed system comprising the compact catalyst pellets (system 2). Despite a better microwave interaction with the catalyst in the pellet form, the fixed bed configuration did not lead to a significant intensification of the process. At 60°C, the styrene molar conversions by using Co-ZSM-11 catalyst were found to be 33% and 3% for systems 1 and 2, respectively. With fine particles, the catalytic activity was higher since the styrene oxidation was able to occur without significant internal diffusional resistance of the reagents toward the active acid sites of the zeolite structure.

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Effect of acidity in TS-1 zeolites on product distribution of the styrene oxidation reaction

Cited by 56 publications

References 23 publications

Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H₂ and O₂

Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H₂ and O₂

Effect of Ag addition into the Activity of Titanium Silicate-1 Catalyst in Cyclohexanone Reaction

Study of Two Catalyst Configurations under Microwave Irradiation for the Selective Benzaldehyde Production over Co-ZSM-11 and Fe-ZSM-11

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Effect of acidity in TS-1 zeolites on product distribution of the styrene oxidation reaction

Cited by 56 publications

References 23 publications

Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H2 and O2

Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H2 and O2

Effect of Ag addition into the Activity of Titanium Silicate-1 Catalyst in Cyclohexanone Reaction

Study of Two Catalyst Configurations under Microwave Irradiation for the Selective Benzaldehyde Production over Co-ZSM-11 and Fe-ZSM-11

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Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H₂ and O₂

Mesoporogen-Free Strategy to Construct Hierarchical TS-1 in a Highly Concentrated System for Gas-Phase Propene Epoxidation with H₂ and O₂