The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform
Suojiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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synthesis of porous and highly crystallinity vanadium Phosphorus Oxide catalysts by multifunctional biomass based deep eutectic solvents
Journal of Physical Chemistry B, 2020Co-Authors: Ting Zhang, Fei Dai, Ruixia Liu, Yanan Shi, Ruirui Zhang, Suojiang ZhangAbstract:Deep eutectic solvents (DES) as a novel class of ionic liquid analogues have been widely used in various fields. Herein, a multifunctional biomass-based DES composed of choline chloride (ChCl) and ...
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synthesis of vanadium Phosphorus Oxide catalysts assisted by deep eutectic solvents for n butane selective oxidation
Industrial & Engineering Chemistry Research, 2019Co-Authors: Huiling Zhang, Fei Dai, Ruixia Liu, Suojiang ZhangAbstract:The effects of choline chloride/oxalic acid deep eutectic solvents (ChCl/OA DES) as a green and effective promoter assisting the synthesis of vanadium Phosphorus Oxide (VPO) catalysts for the selec...
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synthesis of vanadium Phosphorus Oxide catalysts promoted by iron based ionic liquids and their catalytic performance in selective oxidation of n butane
Catalysis Science & Technology, 2018Co-Authors: Fei Dai, Ruixia Liu, Xuejing Chen, Suojiang ZhangAbstract:A series of vanadium Phosphorus Oxide (VPO) catalysts have been firstly synthesized using iron-based ionic liquids (ILs) as additives for selective oxidation of n-butane to maleic anhydride (MA) in this work. Meanwhile, VPO catalysts doped with inorganic iron salts were also prepared for comparison. The catalytic evaluation presented that iron-based IL modification remarkably enhanced the n-butane conversion and MA yield. A combination of techniques including XRD, Raman, TG, BET, SEM, TEM, XPS and H2-TPR was employed to investigate the intrinsic distinction among these catalysts. The results demonstrated that iron-based ILs notably change the morphology of the VPO catalyst from a plate-like structure into chrysanthemum-shape clusters, leading to a significant increase in the surface area of the catalyst, and largely promote the formation of (VO)2P2O7. All of these were closely associated with the synergistic effect existing between the structure-oriented cations and metal anions in ILs during the preparation of the VPO catalyst. In addition, the differences in the structure and redox properties of the catalysts studied were also discussed and compared with those doped with conventional inorganic salt additives.
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Effects of Support for Vanadium Phosphorus Oxide Catalysts on Vapor-Phase Aldol Condensation of Methyl Acetate with Formaldehyde
Industrial & Engineering Chemistry Research, 2016Co-Authors: Hui Zhao, Dan Yang, Chunshan Li, Suojiang ZhangAbstract:Vapor-phase aldol condensation of methyl acetate with formaldehyde over vanadium Phosphorus Oxide (VPO) deposited on SiO2, TiO2, ZrO2, Nb2O5, Sb2O3, γ-Al2O3, and n-γ-Al2O3 (γ-Al2O3 treated with H3PO4) for methyl acrylate production was developed. The VPO/n-γ-Al2O3 was found to have the best performance based on the evaluated experiments in a fixed-bed reactor. The physicochemical properties of the catalysts were investigated by different characterization methods such as the Brunauer–Emmett–Teller method, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, H2 temperature programmed reduction, Fourier transfrom infrared spectroscopy, and NH3- and CO2-temperature programmed desorption. The influence of P–OH intensity and acid strength on activity was obtained through systematic studies over the formation process of VPO phases and the acidity distribution. Preparation and reaction parameters were investigated and optimized.
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reaction of formalin with acetic acid over vanadium Phosphorus Oxide bifunctional catalyst
Industrial & Engineering Chemistry Research, 2015Co-Authors: Dan Yang, Haoyu Yao, Guoliang Zhang, Tiantian Jiao, Suojiang ZhangAbstract:A new route to synthesizing acrylic acid from acetic acid and formalin by one-step aldol condensation reaction was proposed and developed. V-P/SiO2 Oxide bifunctional catalysts were designed and prepared by ultrasonic impregnation method. The catalysts were characterized by XRD, BET, TEM, TG/DTA, and XPS, as well as NH3- and CO2-TPD and pyridine-FTIR methods. Catalytic performance wag evaluated using a fixed-bed tubular microreactor operating with a CH3COOH/HCHO (HAc/FA) molar ratio of 10 under atmospheric pressure. Influences of the balance between acidic and alkaline sites, as well as ratio of V4+ and V5+, on catalyst activity were further studied. Reaction parameters were systemically optimized. Through a series of comparisons, V-P/SiO2 binary Oxide catalyst with a bulk density ratio of 1:2 was selected.
Fei Dai - One of the best experts on this subject based on the ideXlab platform.
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synthesis of porous and highly crystallinity vanadium Phosphorus Oxide catalysts by multifunctional biomass based deep eutectic solvents
Journal of Physical Chemistry B, 2020Co-Authors: Ting Zhang, Fei Dai, Ruixia Liu, Yanan Shi, Ruirui Zhang, Suojiang ZhangAbstract:Deep eutectic solvents (DES) as a novel class of ionic liquid analogues have been widely used in various fields. Herein, a multifunctional biomass-based DES composed of choline chloride (ChCl) and ...
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synthesis of vanadium Phosphorus Oxide catalysts assisted by deep eutectic solvents for n butane selective oxidation
Industrial & Engineering Chemistry Research, 2019Co-Authors: Huiling Zhang, Fei Dai, Ruixia Liu, Suojiang ZhangAbstract:The effects of choline chloride/oxalic acid deep eutectic solvents (ChCl/OA DES) as a green and effective promoter assisting the synthesis of vanadium Phosphorus Oxide (VPO) catalysts for the selec...
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synthesis of vanadium Phosphorus Oxide catalysts promoted by iron based ionic liquids and their catalytic performance in selective oxidation of n butane
Catalysis Science & Technology, 2018Co-Authors: Fei Dai, Ruixia Liu, Xuejing Chen, Suojiang ZhangAbstract:A series of vanadium Phosphorus Oxide (VPO) catalysts have been firstly synthesized using iron-based ionic liquids (ILs) as additives for selective oxidation of n-butane to maleic anhydride (MA) in this work. Meanwhile, VPO catalysts doped with inorganic iron salts were also prepared for comparison. The catalytic evaluation presented that iron-based IL modification remarkably enhanced the n-butane conversion and MA yield. A combination of techniques including XRD, Raman, TG, BET, SEM, TEM, XPS and H2-TPR was employed to investigate the intrinsic distinction among these catalysts. The results demonstrated that iron-based ILs notably change the morphology of the VPO catalyst from a plate-like structure into chrysanthemum-shape clusters, leading to a significant increase in the surface area of the catalyst, and largely promote the formation of (VO)2P2O7. All of these were closely associated with the synergistic effect existing between the structure-oriented cations and metal anions in ILs during the preparation of the VPO catalyst. In addition, the differences in the structure and redox properties of the catalysts studied were also discussed and compared with those doped with conventional inorganic salt additives.
Ruixia Liu - One of the best experts on this subject based on the ideXlab platform.
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synthesis of porous and highly crystallinity vanadium Phosphorus Oxide catalysts by multifunctional biomass based deep eutectic solvents
Journal of Physical Chemistry B, 2020Co-Authors: Ting Zhang, Fei Dai, Ruixia Liu, Yanan Shi, Ruirui Zhang, Suojiang ZhangAbstract:Deep eutectic solvents (DES) as a novel class of ionic liquid analogues have been widely used in various fields. Herein, a multifunctional biomass-based DES composed of choline chloride (ChCl) and ...
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synthesis of vanadium Phosphorus Oxide catalysts assisted by deep eutectic solvents for n butane selective oxidation
Industrial & Engineering Chemistry Research, 2019Co-Authors: Huiling Zhang, Fei Dai, Ruixia Liu, Suojiang ZhangAbstract:The effects of choline chloride/oxalic acid deep eutectic solvents (ChCl/OA DES) as a green and effective promoter assisting the synthesis of vanadium Phosphorus Oxide (VPO) catalysts for the selec...
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synthesis of vanadium Phosphorus Oxide catalysts promoted by iron based ionic liquids and their catalytic performance in selective oxidation of n butane
Catalysis Science & Technology, 2018Co-Authors: Fei Dai, Ruixia Liu, Xuejing Chen, Suojiang ZhangAbstract:A series of vanadium Phosphorus Oxide (VPO) catalysts have been firstly synthesized using iron-based ionic liquids (ILs) as additives for selective oxidation of n-butane to maleic anhydride (MA) in this work. Meanwhile, VPO catalysts doped with inorganic iron salts were also prepared for comparison. The catalytic evaluation presented that iron-based IL modification remarkably enhanced the n-butane conversion and MA yield. A combination of techniques including XRD, Raman, TG, BET, SEM, TEM, XPS and H2-TPR was employed to investigate the intrinsic distinction among these catalysts. The results demonstrated that iron-based ILs notably change the morphology of the VPO catalyst from a plate-like structure into chrysanthemum-shape clusters, leading to a significant increase in the surface area of the catalyst, and largely promote the formation of (VO)2P2O7. All of these were closely associated with the synergistic effect existing between the structure-oriented cations and metal anions in ILs during the preparation of the VPO catalyst. In addition, the differences in the structure and redox properties of the catalysts studied were also discussed and compared with those doped with conventional inorganic salt additives.
Jean-claude Volta - One of the best experts on this subject based on the ideXlab platform.
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vanadium Phosphorus Oxides a reference catalyst for mild oxidation of light alkanes a review
Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule C-chimie, 2000Co-Authors: Jean-claude VoltaAbstract:Abstract Vanadium Phosphorus Oxides (VPO) are very promising materials for the mild oxidation of light alkanes. This is obvious from the considerable knowledge of the physicochemistry of the VPO catalytic system for which many complementary techniques have been used. The present state of the art and the possibilities for the development, in the future, of such a family of catalysts are discussed. It is highly possible that the discovery of new industrial processes for the oxidation of alkanes will stem from the improvement of vanadium Phosphorus Oxide catalysts.
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modifications of vanadium Phosphorus Oxides by aluminium phosphate for n butane oxidation to maleic anhydride
Studies in Surface Science and Catalysis, 2000Co-Authors: Steve Holmes, Andy Burrows, Louisa Sartoni, Christopher J. Kiely, V Martin, Graham John Hutchings, Jean-claude VoltaAbstract:Aluminium phosphate associated with vanadium Phosphorus Oxide is demonstrated in improving both the catalytic performance for the production of maleic anhydride from n-butane and the time of activation of the catalyst as compared to conventional vanadium Phosphorus Oxide catalysts. Aluminium phosphate is prepared at a fixed pH and then added during the preparation of the VOHPO 4 , 0.5 H 2 O precursor. The morphology of the VPO precursor is influenced by the nature of the A1PO material. The VPO-A1PO catalyst is then activated in situ under an-butane/air atmosphere. During the activation, (VO) 2 P 2 O 7 is formed and the original amorphous A1PO material crystallizes. No new ternary VA1PO phase is observed. The improvement in the catalytic properties of the mixed VPO-A1PO Oxide system cannot solely be explained in terms of a doped V(Al)P0 catalyst (Al/V= 1%) prepared independently, for which the catalytic performances are lower.
Vadim V Guliants - One of the best experts on this subject based on the ideXlab platform.
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phase transformations in mesostructured vanadium Phosphorus Oxides
Catalysis Today, 2003Co-Authors: Moises A Carreon, Vadim V GuliantsAbstract:Abstract Mesostructured lamellar, hexagonal and cubic vanadium–Phosphorus-Oxide (VPO) phases were prepared employing cationic, anionic and alkylamine surfactants under mild conditions and low pH. The obtained mesophases displayed desirable vanadium oxidation states (+3.8 to +4.3) and P/V molar ratios ∼1.0 for the partial oxidation of n-butane to maleic anhydride. As-synthesized mesostructured VPO underwent phase transformations to various mesostructured and dense VPO phases depending on the post-synthesis treatment. The phase transformations of mesostructured VPO during Soxhlet extraction and thermal treatment in N2 have been observed for the first time. These transformations were explained by the changes in the surfactant packing parameter, g. Calcination in air produced more disordered mesostructures and dense VPO phases such as γ-VOPO4 and (VO)2P2O7.