A5091005428- Zeolite Catalysis and Synthesis
- Catalysis for Biomass Conversion
- Catalytic Processes in Materials Science
- Catalysis and Hydrodesulfurization Studies
- Catalysis and Oxidation Reactions
- Mesoporous Materials and Catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Chemical Synthesis and Characterization
- Carbon dioxide utilization in catalysis
- Nanomaterials for catalytic reactions
- Advanced NMR Techniques and Applications
- Chemical Synthesis and Reactions
- Advanced Photocatalysis Techniques
- Ammonia Synthesis and Nitrogen Reduction
- Asymmetric Hydrogenation and Catalysis
- Catalysts for Methane Reforming
- Polyoxometalates: Synthesis and Applications
- CO2 Reduction Techniques and Catalysts
- Advancements in Battery Materials
- Electrocatalysts for Energy Conversion
- TiO2 Photocatalysis and Solar Cells
- Radioactive element chemistry and processing
- Gas Sensing Nanomaterials and Sensors
- Graphene research and applications
- Advanced Nanomaterials in Catalysis
Nankai University
2016-2025
Nanchang Hangkong University
2017-2022
University of Stuttgart
2011-2019
Stuttgart Observatory
2018
Collaborative Innovation Center of Chemical Science and Engineering Tianjin
2014-2016
Ministry of Education of the People's Republic of China
2015
Institute of Chemical Technology
2012
The University of Sydney
2011
Substoichiometric tungsten oxide single-crystal nanosheets are successfully prepared via the exfoliation of layered tungstic acid and subsequent introduction oxygen vacancies. The combination different strategies, i.e., 2D-structure construction, surface vacancies, creation localized plasmon resonance can promote light-harvesting performance through accumulative synergistic effects.
Nanocrystalline Sn-Beta zeolites have been successfully prepared via an improved two-step postsynthesis strategy, which consists of creating vacant T sites with associated silanol groups by dealumination parent H-Beta and subsequent dry impregnation the resulting Si-Beta organometallic dimethyltin dichloride. Characterization results from UV–vis, XPS, Raman, 119Sn solid-state MAS NMR reveal that most Sn species incorporated into framework Beta zeolite through process exist as isolated...
ConspectusZeolites, accompanied by their initial discovery as natural mines and the subsequent large-scale commercial production, have played indispensable roles in various fields such petroleum refining chemical industry. Understanding characteristics of zeolites, contrast to counterparts with similar compositions origin thereof, is always a hot challenging topic. Zeolites are known intrinsic confined systems ordered channels on molecular scale, structural confinement has been proposed...
SAPO-34 materials with comparable Brønsted acid site density but different crystal sizes were applied as methanol-to-olefin (MTO) catalysts to elucidate the effect of size on their deactivation behaviors. 13C HPDEC MAS NMR, FTIR, and UV/vis spectroscopy employed monitor formation nature organic deposits, densities accessible sites active hydrocarbon-pool species studied a function time-on-stream (TOS) by 1H NMR spectroscopy. The above-mentioned spectroscopic methods gave very complex picture...
Little is known on the early stages of methanol-to-olefin (MTO) conversion over H-SAPO-34, before steady-state with highly active polymethylbenzenium cations as most important intermediates reached. In this work, formation and evolution carbenium ions during MTO a H-SAPO-34 model catalyst were clarified via 1H MAS NMR 13C NMR. Several initial species (i.e., three-ring compounds, dienes, polymethylcyclopentenyl, polymethylcyclohexenyl cations) were, for first time, directly verified...
Mesoporous Zr-Beta exhibits a remarkable catalytic activity and regio-selectivity to β-amino alcohols in epoxide aminolysis. Intra-crystalline mesopores greatly promote the reaction through enhanced mass transfer suppress deactivation.
The selective hydrogenation of alkynes to alkenes is an important type organic transformation with large-scale industrial applications. This requires efficient catalysts precise selectivity control, and palladium-based metallic are currently employed. Here we show that four-coordinated cationic nickel(II) confined in zeolite can efficiently catalyze the acetylene ethylene, a key process for trace removal prior polymerization process. Under optimized conditions, 100% conversion ethylene up...
Understanding the unique behaviors of atomically dispersed catalysts and origin thereof is a challenging topic. Herein, we demonstrate facile strategy to encapsulate Ptδ+ species within Y zeolite reveal nature selective hydrogenation over Pt@Y model catalyst. The configuration Pt@Y, namely stabilized by surrounding oxygen atoms six-membered rings shared sodalite cages supercages, enables exclusive heterolytic activation dihydrogen Ptδ+···O2- units, resembling well-known classical Lewis...
Ti-Beta zeolite prepared <italic>via</italic> a reproducible and scalable two-step post-synthesis strategy is robust catalyst for the epoxidation of unsaturated ketones with hydrogen peroxide.
Silicoaluminophosphates (SAPO) with different framework structures and amounts of Brønsted acid sites, that is, SAPO-34, SAPO-41, SAPO-11, SAPO-46, were synthesized studied as catalysts for the methanol-to-olefin (MTO) conversion. Besides well-known SAPO-34 catalyst, also SAPO-41 exhibits a good MTO performance methanol conversion 100% selectivity to light olefins about 70% at reaction temperature 723 K, which maintains up time-on-stream 10 h. The sites silicoaluminophosphate employed in...
Metal nanoparticles encapsulated in zeolite have been recently developed as a special type of catalyst that shows significant advantages activity, shape-selectivity, and stability over conventional supported catalysts. The selectivity modulation nanoparticle catalysis by the microenvironment is theoretically possible but not addressed yet. Here, we report situ encapsulation sub-nanometric palladium species within MFI-type zeolites, which exhibit high activity good hydroconversion furfural...
Bifunctional Zn–Y/Beta catalyst was applied in the reaction mechanism study of ethanol to butadiene conversion clarify roles Zn and Y functional sites each individual step. According results several complementary methods, i.e., temperature-programmed desorption (TPD), surface (TPSR), situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), network consisting key steps, dehydrogenation, acetaldehyde aldol condensation, crotonaldehyde reduction, elucidated. An enolization...
The one-pot conversion of ethanol to butadiene is a promising route for production; however, simultaneous attainment high productivity and selectivity challenging. Here, zeolite-confined bicomponent Zn–Y clusters were constructed applied as robust catalysts ethanol-to-butadiene with state-of-the-art 2.33 gBD/gcat/h ∼63%. Structural confinement effects are responsible the enhanced production efficiency via multiple-step cascade reaction.
Ga-modified nano H-ZSM-5 zeolites with different Ga contents were prepared and applied as methanol-to-aromatics (MTA) catalysts. The introduction can strongly increase the selectivity to aromatics but also decrease catalyst lifetime simultaneously. Upon cofeeding of n-butanol methanol, a significant prolongation from 18 ca. 50 h be achieved. According several spectroscopic results, e.g., TGA, GC–MS, in situ UV/vis, solid-state MAS NMR spectroscopy, addition during MTA conversion shows no...
We report a heterogeneous catalysis strategy to the sustainable hydration of epoxides by designing robust Lewis acid catalysts confined in zeolite cages as natural shape-selective nanoreactors. In case ethylene oxide hydration, Sn-H-SSZ-13 exhibits remarkable catalytic performance, with an conversion above 99% and monoethylene glycol selectivity 99%, at approaching stoichiometric water/ethylene ratios near-ambient reaction temperatures. It is revealed theoretical studies that partially...
A variety of Sn-containing Beta zeolites possessing framework or extraframework Sn sites were prepared by a two-step postsynthesis procedure. The nature these species was systematically investigated several approaches, including DRIFT, XPS, UV–vis, and solid-state 119Sn MAS NMR spectroscopy. subtle distinctions the Lewis acidic features between identified via acetone-2-13C, TMPO, NH3 adsorption, studied 13C, 31P, 1H spectroscopy, respectively. Two types acid (LAS) have been observed...
The formation of the initial carbon–carbon (C–C) bonds in methanol-to-hydrocarbon (MTH) conversion on acidic zeolite has been hotly debated for decades. Recently, surface-bound acetyl groups involving C–C during period MTH disclosed. Understanding exact bond-containing intermediates triggering and critical roadmap is essential further development this important reaction. Herein, acetaldehyde from hydrogenation species was identified to be responsible H-ZSM-5 zeolite. By combining kinetic...
Abstract As a commercial MTO catalyst, SAPO-34 zeolite exhibits excellent recyclability probably due to its intrinsic good hydrothermal stability. However, the structural dynamic changes of catalyst induced by hydrocarbon pool (HP) species and water formed during conversion as well long-term stability after continuous regenerations are rarely investigated poorly understood. Herein, framework were identified 1D 27 Al, 31 P MAS NMR, 2D P- Al HETCOR NMR spectroscopy. The breakage T-O-T bonds in...