A Novel NiCl2-CuCl2/HMOR Catalyst for Direct Vapor-Phase Carbonylation of Methanol

2013 ◽  
Vol 316-317 ◽  
pp. 983-986 ◽  
Author(s):  
Hai Xia Wang ◽  
Wen Wen Guo ◽  
Ling Jun Zhu
Keyword(s):  
High Activity ◽  
Methyl Iodide ◽  
Vapor Phase ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Composite Catalyst ◽  
Reaction Conditions ◽  
Reaction Pressure ◽  
Methanol Carbonylation ◽  
Optimum Reaction

Direct vapor-phase methanol carbonylation, without any methyl iodide in the feed as a promoter, was carried out over NiCl2-CuCl2/HMOR catalysts. The results showed that NiCl2-CuCl2/HMOR catalysts exhibited high activity for methanol carbonylation. The optimum component of the composite catalyst was 5wt% NiCl2 and 15wt% CuCl2. In addition, the effects of reaction pressure and temperature on catalytic performance of 5%NiCl2-15%CuCl2/HMOR catalyst were investigated. It was revealed that methanol conversion of 84.2% and carbonylation selectivity of 73.5% could be obtained under the optimum reaction conditions of P=1.5MPa and T=623K.

scholarly journals Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

Catalysts ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 209 ◽  
Author(s):  
Almerinda Di Benedetto ◽  
Gianluca Landi ◽  
Luciana Lisi
Keyword(s):  
High Activity ◽  
Catalytic Performance ◽  
Oxidation Of Co ◽  
High Concentration ◽  
Reaction Conditions ◽  
Wet Impregnation ◽  
Preferential Oxidation Of Co ◽  
Icp Ms ◽  
Copper Sites ◽  
Temperature Programmed

Despite of the huge number of papers about the catalytic preferential oxidation of CO (CO-PROX) for the purification of H2 streams, there is still a need for more effective catalysts in order to reduce the large required catalyst volume of CO-PROX unity. In this work, large surface area nanometric ceria was used as support for CuO/CeO2 catalysts with CuO load up to 10 wt % easily dispersed by wet impregnation. Catalysts were characterized by ICP-MS, XRD, SEM/EDS, N2 physisorption, H2 temperature programmed reduction (TPR), and CO2 temperature programmed desorption (TPD) and tested under different reaction conditions (including under feed containing inhibiting species such as CO2 and H2O). Catalytic tests revealed that our samples show high activity and selectivity even under stringent reaction conditions; moreover, they result among the most active catalysts when compared to those reported in the scientific literature. The high activity can be related to the enhanced amount of highly dispersed copper sites in strong interaction with ceria related to the nature of the nanometric support, as evidenced by the characterization techniques. Despite the high concentration of active copper sites, catalytic performance is limited by CO2 desorption from ceria in the neighborhood of copper sites, which prevents a further improvement. This suggests that new catalyst formulations should also provide a lower affinity towards CO2.

The Preparation of Sugarcane Bagasse Microcrystaline Cellulose in Subcritical Water/CO2

2011 ◽  
Vol 396-398 ◽  
pp. 1769-1772
Author(s):  
Ke Lin Huang ◽  
Ben Wang ◽  
Xiao Yu Peng ◽  
Ze Fen Wang ◽  
Ke Xian Li ◽  
...  
Keyword(s):  
Reaction Time ◽  
Sugarcane Bagasse ◽  
Reaction Temperature ◽  
Subcritical Water ◽  
Reaction Conditions ◽  
Reaction Pressure ◽  
Good Thermal Stability ◽  
Solid Ratio ◽  
Optimum Reaction ◽  
Ft Ir

Sugarcane bagasse microcrystalline cellulose (SBMC) was first prepared under subcritical Water/CO2 by degradation of sugarcane bagasse cellulose (SBC). The obtained products were characterized by FT-IR, XRD and TGA and the results showed that the amorphous parts of SBC was easily decomposed, and yet the crystal parts kept a good form all along during the degradation, which demonstrated SBMC had good thermal stability. Furthermore, the reaction temperature, reaction time, reaction pressure and liquid-solid ratio were systematically investigated during the work. The optimum reaction conditions are as follows: the reaction temperature was 200°C; the reaction time was 60 min; the reaction pressure was 2 MPa and the liquid-solid ratio was 40:1.

scholarly journals Synthesis of Benzil by Air Oxidation of Benzoin and M(Salen) Catalyst

2019 ◽  
pp. 1-8 ◽  
Author(s):  
Qiuxin Shen ◽  
Liting Xu ◽  
Yiyan Jiang ◽  
Ran Zheng ◽  
Yiping Zhang
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
Low Cost ◽  
Catalytic Performance ◽  
Air Oxidation ◽  
Catalyst Recycling ◽  
Reaction Conditions ◽  
Salen Complex ◽  
1H Nuclear Magnetic Resonance ◽  
Optimum Reaction

Bis salicylaldehyde ethylenediamine Schiff base (Salen) and its complexes with three metal ions (Co2+, Ni2+, Zn2+) were prepared, and characterized by infrared spectroscopy(IR). Using air as oxygen source, the optimum reaction conditions for the catalytic oxidation of 0.05 mol benzoin by Co (Salen) were obtained by orthogonal test as follows: base KOH 2 g, catalyst 1.5 g, N, N-dimethylformamide(DMF) as solvent, reaction temperature 40 °C, reaction time 1 h. Under these conditions, the catalytic performances of different metal complexes were investigated. The catalytic activity of Co(Salen) was the best one, the yield of benzil was up to 93.6%, the number of Ni(Salen) and Zn(Salen) was 86.3% and 82.1%, respectively. The reused catalytic performance of M(Salen) complex was also studied. The catalytic activity of Co(Salen), Ni(Salen) and Zn(Salen) was stable after 4 times recycle, the yield of benzil was 71.4%, 63.3% and 57.4%, respectively, and it was easy for catalyst recycling. The oxidation product was certainly benzil with high purity according to the characterization results of melting point(MP), IR, high performance liquid chromatography(HPLC) and 1H nuclear magnetic resonance(1H NMR). Compared with the common synthetic method of benzil, this one has the advantages of friendly environment, low cost and easy operation. It is a simple and green way to synthesize benzoyl efficiently.

The Preparation of Micro-Molecular Dextran in Sub-Critical Water/CO2

2013 ◽  
Vol 712-715 ◽  
pp. 502-505
Author(s):  
Shu Qiong Liao ◽  
Xiao Yu Peng ◽  
Xue Wang Zhang ◽  
Ke Lin Huang ◽  
Ben Wang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Temperature Reaction ◽  
Liquid Ratio ◽  
Reaction Conditions ◽  
Reaction Pressure ◽  
Optimum Reaction ◽  
Ft Ir ◽  
Solid Liquid ◽  
Hydrolysis Of

Micro-molecular dextran was prepared in sub-critical water/CO2 by hydrolysis of dextran20. The obtained products were mainly characterized by FT-IR and GPC. Furthermore, the reaction temperature, reaction time, reaction pressure, solid-liquid radio and stirring speed were systematically investigated during the work. The optimum reaction conditions are as follows: the reaction temperature was 160°C; the reaction time was 60 min; the reaction pressure was 2.5MPa; the solid-liquid ratio was 0.6 and the stirring speed was 300r/min.

scholarly journals Rh Particles Supported on Sulfated g-C3N4: A Highly Efficient and Recyclable Heterogeneous Catalyst for Alkene Hydroformylation

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1359
Author(s):  
Yukun Shi ◽  
Yang Lu ◽  
Tongxin Ren ◽  
Jie Li ◽  
Qiqige Hu ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Large Scale ◽  
Oxygen Vacancies ◽  
Reduction Method ◽  
Nitrogen Adsorption ◽  
Catalytic Performance ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
The Stability ◽  
Recyclable Heterogeneous Catalyst

The hydroformylation of alkenes with CO and H2 to manufacture aldehydes is one of the most large-scale chemical reactions. However, an efficient and recyclable heterogeneous catalyst for alkene hydroformylation is extremely in demand in academia and industry. In this study, a sulfated carbon nitride supported rhodium particle catalyst (Rh/S-g-C3N4) was successfully synthesized via an impregnation-borohydride reduction method and applied in the hydroformylation of alkenes. The catalysts were characterized by XRD, FTIR, SEM, TEM, XPS, and nitrogen adsorption. The influence of the sulfate content, pressure of syngas, temperature, and reaction time, as well as the stability of Rh/S-g-C3N4, on the hydroformylation was examined in detail. The delocalized conjugated structure in g-C3N4 can lead to the formation of electron-deficient aromatic intermediates with alkenes. The sulphate g-C3N4 has a defected surface owing to the formation of oxygen vacancies, which increased the adsorption and dispersion of RhNPs on the surface of g-C3N4. Therefore, Rh/S-g-C3N4 exhibited an outstanding catalytic performance for styrene hydroformylation (TOF = 9000 h−1), the conversion of styrene could reach 99.9%, and the regioselectivity for the branched aldehyde was 52% under the optimized reaction conditions. The catalytic properties of Rh/S-g-C3N4 were also studied in the hydroformylation of various alkenes and displayed an excellent catalytic performance. Furthermore, the reuse of Rh/S-g-C3N4 was tested for five recycling processes, without an obvious decrease in the activity and selectivity under the optimum reaction conditions. These findings demonstrated that Rh/S-g-C3N4 is a potential catalyst for heterogeneous hydroformylation.

scholarly journals Microwave Assisted Hydrolysis of Holocellulose Catalyzed with Sulfonated Char Derived from Lignin-Rich Residue

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Kui Wang ◽  
Xinfeng Xie ◽  
Zhan Si ◽  
Jianchun Jiang ◽  
Jingxin Wang
Keyword(s):  
Dry Mass ◽  
Catalytic Performance ◽  
Hydrolysis Time ◽  
Reaction Conditions ◽  
Microwave Assisted ◽  
Dilute Sulfuric Acid ◽  
Hydrolysis Temperature ◽  
Optimum Reaction ◽  
Catalyst Content ◽  
Hydrolysis Of

A microwave assisted green process has been developed for production of sugars through liquefying holocellulose catalyzed with sulfonated char derived from the lignin-rich residue produced during pretreatment of lignocellulose. Various reaction parameters including the hydrolysis temperature, hydrolysis time, catalyst content, and the ratio of water to feedstock were evaluated. The maximum sugars yield of 82.6% (based on the dry mass of holocellulose) was obtained under the optimum reaction conditions. The sulfonated char showed superior catalytic performance to that of dilute sulfuric acid in converting holocellulose into sugars under microwave irradiation.

Study on the Synthesis of Isoamyl Acetate Catalyzed by Strong Acidic Cation Exchange Resin

2011 ◽  
Vol 396-398 ◽  
pp. 2411-2415 ◽  
Author(s):  
Ping Lan ◽  
Li Hong Lan ◽  
Tao Xie ◽  
An Ping Liao
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Cation Exchanger ◽  
Cation Exchange Resin ◽  
Isoamyl Acetate ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Reaction Conditions ◽  
Optimum Reaction

Isoamyl acetate was synthesized from isoamylol and glacial acetic acid with strong acidic cation exchanger as catalyst. The effects of reaction conditions such as acid-alcohol ratio, reaction time, catalyst dosage to esterification reaction have been investigated and the optimum reaction conditions can be concluded as: the molar ratio of acetic acid to isoamylol 0.8:1, reaction time 2h, 25 % of catalyst (quality of acetic acid as benchmark). The conversion rate can reach up to 75.46%. The catalytic ability didn’t reduce significantly after reusing 10 times and the results showed that the catalyst exhibited preferably catalytic activity and reusability.

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