A5006846101- Zeolite Catalysis and Synthesis
- Mesoporous Materials and Catalysis
- Polyoxometalates: Synthesis and Applications
- Catalytic Processes in Materials Science
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysis for Biomass Conversion
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Chemical Synthesis and Reactions
- Microplastics and Plastic Pollution
- Chemical Synthesis and Characterization
- RFID technology advancements
- Asymmetric Hydrogenation and Catalysis
- Sulfur-Based Synthesis Techniques
- Membrane Separation Technologies
- Nanomaterials for catalytic reactions
- Membrane Separation and Gas Transport
Sinopec (China)
2015-2024
Institute of Petroleum Chemistry
2016-2020
State Council of the People's Republic of China
2020
Hierarchical TS-1 with intracrystalline voids could be synthesized by post-modification tetrapropyl ammonium hydroxide (TPAOH), however the process was supposed to restrained charge balance effect.
Titanium silicalite-1 (TS-1) has been shown to be a heterogeneous catalyst with remarkable efficiency and selectivity; however, the nature of active Ti site in MFI framework remains elusive. Here we report combined experimental theoretical research on distribution 12 crystallographically distinct T sites high-Ti-loaded TS-1 (2.7 wt % TiO2). Using multishell fit extended X-ray absorption fine structure, show that T4 is most populated site, marked contrast preferential substitution definitely...
It is of great importance to design heterogeneous catalysts for aldol condensation methyl acetate and formaldehyde realize the green sustainable production acrylate. Herein, Cs-based via incipient wetness impregnation were optimized through enhanced interaction between supports (amorphous SiO2, silicalite-1, TS-1) Cs sites. By various characterization techniques such as IR–OH 133Cs magic angle spinning NMR, it was proven that Cs/TS-1 exhibited strongest TS-1 species with lowest preservation...
Tetrapropylammonium hydroxide (TPAOH) as an organic structure directing agent (OSDA) is of great importance for the preparation titanium silicalite-1 (TS-1) zeolite. In this paper, we employed a new OSDA, allyltripropylammonium (ATPAOH), in synthesis process and successfully synthesized ATS-1 zeolite (MFI type). Compared with traditional OSDA TPAOH, one TPAOH's propyl groups substituted by allyl group, which endows ATPAOH unique properties. On hand, accelerates crystallization rate...
This work not only provides an efficient and green epoxidation route over robust catalysts with easily available O 2 as the oxidant, but also systematically reveals understanding of corresponding structure–activity relationship for ROS transformation.
Vapor-phase Beckmann rearrangement of cyclohexanone oxime (CHO) to ε-caprolactam (CPL) is still difficult commercialize at the industrial scale due its relatively low catalytic activity and poor lifetime. Herein, we synthesized a series pure-silicon zeolites (including MFI, MEL, -SVR) with three-dimensional 10-member-ring topolgies, diverse silanol status, hierarchical porosity investigate synergistic effects inner diffusivity reactivity. S-1 zeolite MFI-type topology plentiful nests...
Silanization is an effective approach for the hydrothermal synthesis of hierarchical zeolite. However, secondary porosity created subject to organosilane size. Herein, inert silanes and surfactant were introduced intensify interactions between hydrophobic group active organosilane, TS-1 (HTS) with more supermicropores (1–2 nm) mesopores (2–4 prepared. More importantly, modified silanization process beneficial titanium incorporation. Consequently, although there silicon on surface HTS...
A novel chlorohydrination process of allyl chloride with HCl and H<sub>2</sub>O<sub>2</sub> catalyzed by hollow titanium silicate zeolite has been developed, overcoming the significant drawbacks traditional Cl<sub>2</sub>-based route.
The liquid–solid postsynthetic method is commonly used in the preparation of metal-containing zeolites, for example, Ti-β (BEA) zeolite. This paper reports a facile and Ti incorporation improved impregnation zeolite by incorporating unique precursor, namely, partially ethoxylated chlorotitanate (Ti(Cl)4–n(OEt)n), into defects dealuminated β precursor was prepared from reaction TiCl4 ethanol, its structure determined visible Raman spectroscopy. species coordination state distribution...
Titanium silicalite-1 (TS-1) is an important catalyst for alkene epoxidation, but the crystalline micropore too small some alkenes. Although diffusion limitation would be relieved by intracrystalline mesopores, catalytic performance should further improved, considering conversion. Herein, molybdenum encapsulation was achieved during a silanization process hierarchical TS-1 synthesis. relative crystallinity decreased, more supermicropores of about 1.2–1.8 nm and mesopores in 2–4 range have...
Proposed “dissolve and precipitate” reaction mechanism of WO 3 –STS catalyzed MO oxidative cleavage reaction.
An efficient regeneration method to encapsulate the poisonous amorphous TiO2-SiO2 nanoparticles within zeolite crystal via post-synthesis has been developed. It is demonstrated that encapsulation of Ti-rich can reduce accessibility H2O2 molecules acid sites nanoparticles, thus lowering inefficient decomposition oxidant during catalytic reactions. Furthermore, regenerated HTS smaller particle size than conventional TS-1 due existence deactivated as seed hydrothermal synthesis. Consequently,...
The oxidative coupling of imines to ketazine with molecular oxygen is a green process towards the synthesis hydrazine or hydrate, which could efficiently address economic and environmental issues traditional Raschig peroxide-ketazine process. Herein, we developed an efficient heterogeneous base-free benzophenone imine route O2 catalyzed by Cu/CuO x /carbon materials derived from MOFs under mild conditions. Under optimized conditions, conversion BI up 98.2% selectivity ketamine 94.9%. This...