A5030322536- Catalytic Processes in Materials Science
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Electrocatalysts for Energy Conversion
- Zeolite Catalysis and Synthesis
- Catalysis and Hydrodesulfurization Studies
- Molecular Spectroscopy and Structure
- Ammonia Synthesis and Nitrogen Reduction
- Polymer Nanocomposite Synthesis and Irradiation
- Atmospheric Ozone and Climate
- Advanced Chemical Physics Studies
- Polymer Nanocomposites and Properties
- Lubricants and Their Additives
Shanghai Research Institute of Chemical Industry
2018-2024
Lanzhou University
2024
State Key Laboratory of Chemical Engineering
2012-2019
East China University of Science and Technology
2012-2019
Sinopec (China)
2019
Qingdao University of Science and Technology
2015
Abstract Direct synthesis of light olefins from syngas (STO) using a bifunctional catalyst composed oxide and zeolite has attracted extensive attention in both academia industry. It is highly desirable to develop robust catalysts that could enhance the CO conversion while simultaneously maintain high selectivity C2-C4 olefins. Herein, we report consisting ZnCr binary (ZnCrO x ) low-Si AlPO-18 zeolite, showing satisfying 45.0% (86.7%, 2 free) olefin/paraffin ratio 29.9 at 25.2% under mild...
Operando and kinetic studies of lean-burn methane combustion were preformed on a Pd(3.3 wt %)/γ-Al2O3 catalyst in low temperature range 473–673 K. The reaction order with respect to oxygen decreased temperature, the remained constant. working is characterized using operando Raman spectroscopy situ diffuse reflectance infrared Fourier transform CO adsorption (DRIFTS), Pd chemical states measured X-ray photoelectron (XPS). Partial oxidation atoms during was identified by XPS spectroscopies. In...
Abstract The direct synthesis of light olefins from syngas over a bifunctional catalyst containing an oxide and zeolite has been proven to be promising strategy. Nevertheless, unclear reaction network hinders any further enhancement in catalytic performance, such as increasing the conversion CO. We herein report novel composed InZr binary SAPO‐34 displaying superior CO (27.7 %) with selectivity (73.6 at 400 °C, 2.0 MPa. demonstrate that Zr‐doped body‐centered cubic In 2 O 3 phase, exhibiting...
CeO2 nanorods supported Co–CoOx catalysts showed high selectivity for higher alcohol synthesis (HAS) from syngas. The has found to increase with lowering the Co loadings, and value over Co1/CeO2 (19.86%) is twice than that Co5/CeO2 (8.67%). active sites at interfaces between Co0 CoOx, or say, pairs, have evidenced be responsible HAS. strong metal–support interactions retard reduction of CoOx stabilize intermediates such as CO–Coδ+. Likely, CO favors dissociating on metallic surface form CHx...
One-step conversion of syngas to aromatics (STA) over an oxide–zeolite bifunctional catalyst is promising as alternative route for aromatic production. Control distribution and enhancement benzene, toluene, xylene (BTX) selectivity are still a big challenge. Decoupling the complex reaction network, relative activity aromatization alkylation on ZSM-5 determines distribution. Herein, STA was studied Cr2O3/ZSM-5 reveal influence zeolite morphology parameters Using "substitution ratio ring"...
Higher alcohol synthesis (HAS) directly from syngas is one of the most promising approaches for utilizing nonoil resources cleanly and efficiently. A series bimetallic CoCu catalysts with different Co/Cu ratios were prepared using a SiO 2 support. The structure Cu modified Co was characterized HRTEM, in/ex situ X‐ray diffraction, temperature‐programmed reduction. It evidenced that nanoscale metal particles formed reduction oxide at above 673 K. Meanwhile, interaction between on surface...
Abstract By using operando Raman spectroscopy (ORS), we investigated the panoramic structure evolution of an iron oxide (α‐Fe 2 O 3 ) catalyst, which is used for production olefins via Fischer–Tropsch (FTO). During activation in different atmospheres and reaction at 260 °C 3.0 MPa, α‐Fe was only partially transformed into γ‐Fe by H pretreatment; meanwhile, a transformation →γ‐Fe →Fe 4 5 C observed both CO syngas (H /CO). Combining with other techniques such as XRD, TEM, XPS TPSR, reveal that...
Controlling the formation, diffusion, and conversion of bridging intermediate is important for improving performance a tandem reaction over multi-component catalyst. However, it remains highly challenging because random distribution catalytic components via conventional mechanical combination usually endows nondirectional resulting in an obvious decrease performance. Here, we report recrystallization methodology dealing with extruded Cr2O3/ZSM-5 bifunctional catalyst to distribute oxide on...
Density functional theory (DFT) calculations were used to study C2 oxygenate from syngas over bimetallic Co/Cu catalysts. The thermodynamics and kinetics for all possible elementary steps involved in the formation of have been investigated on both pure Cu-doped Co(0001) surfaces. By comparing results two surfaces, role copper improving selectivity toward oxygenates has identified as aspects: (1) controlling Co ensemble size blocking active sites C–O bond cleavage, which inhibition CHx...
The migration of bridging intermediates (methanol) from oxides to zeolites is crucial in the direct conversion syngas light olefins via tandem process. As initiation step this migration, adsorption and desorption effect methanol on oxide components remains elusive. Herein, we systematically compared catalytic performances a series ZnAlOx with different Zn/Al ratios corresponding bi-component catalysts integrated AlPO-18 zeolite component. structures surface acidity were characterized by...
Direct conversion of syngas to light olefins using bifunctional catalysts containing both oxides and zeolites represents a promising alternative in comparison with Fischer-Tropsch synthesis. It is still great challenge achieve highly selective production ethylene propylene at satisfying CO for potentially industrial applications. Here, we report that high selectivity can be achieved by tailoring silicoaluminophosphate zeolite structure acid site strength. By comparing composed ZnCr oxide...
The development of the global economy leads to a rising demand for light olefins, which are basic chemical raw materials. Recently, series bifunctional catalysts consisting metal oxide and zeolite have been reported perform excellent olefin selectivity from syngas attract much attention. In this article, new sulfide (MoS2)–zeolite (SAPO-34) composite catalyst was studied conversion olefins. It found that side reaction methanation hydrogenation olefins paraffins suppressed by introduction...
Direct synthesis of aromatics from syngas (STA) over an oxide–zeolite bifunctional catalyst is promising as a petroleum alternative route. Aromatics space-time yield (STY) key parameter for measuring the production capacity in industrial process. However, it still great challenge to achieve high STY applications. Herein, we synthesized series CeMnOx catalysts with self-cleaning effect. The structures and reduction process were thoroughly characterized by X-ray absorption fine structure situ...
A liquid-seed assisted synthesis method was developed to prepare nano-sized lamellar SAPO-n zeolite. The aging of results in the dissolution solid-seed particles and thus adjusts ability direct zeolite crystallization. Lamellar SAPO-34 with thickness about 50 nm well-controlled acidity synthesized yield reaches 80% (SiO2/Al2O3 = 0.4, TEA/Al2O3 1.6, contents 3.35%). bifunctional catalyst consisting above prepared ZnCrOx oxide shows a high space-time (STY) light olefins reaching 212 g•kg−1•h−1...
ABSTRACT We substituted the small molecular model compound α-pinene of butyl rubber (IIR) to simulate reaction between sodium hydride (NaH) and isoprene structural unit IIR. Meanwhile, we provided reference data on mechanism degree for modified IIR with an active carboanion-based center. In this way, possible chemically pathways were studied. 1H nuclear magnetic resonance results showed that have a very high similarity. NaH can not only produce substitution in allylic position α-pinene, but...
Direct synthesis of light olefins from syngas over a bifunctional catalyst containing oxides and zeolites is one the best choices for clean efficient utilization coal resources. InZr/SAPO-34 considered as promising Cr-free STO reaction; however, selectivity paraffin increased obviously at high CO conversion. Hence, inhibition production on strongly desired to further enhance catalytic performance. Herein, we attempt modify properties InZr with K modulate hydrogenation process. The structures...
The pure rotational and rovibrational spectra of the ν27 –NH2 torsion cyclopropylamine (CPA) in far-infrared region were measured with a high-resolution Fourier transform infrared coupled to synchrotron. complex reflect presence both trans gauche conformers. Analysis (34–64 cm−1) yielded accurate centrifugal distortion constants ground first two torsional excited states trans-CPA. fundamental, hot bands weak overtones identified assigned 200–550 cm−1 range. Global analysis over 19 000...