Hydrotalcite as Active and Selective Catalyst for Synthesis of Dehydrozingerone from Vanillin and Acetone: Effect of Catalyst Composition and Calcination Temperature on Activity and Selectivity

2017 ◽  
Vol 6 (2) ◽  
pp. 105-114 ◽  
Author(s):  
Shivaji Bhanawase ◽  
Ganapati Yadav
Keyword(s):  
Calcination Temperature ◽  
Selective Catalyst ◽  
Catalyst Composition

scholarly journals Effects of Composition and Calcination Temperature on Photocatalytic Evolution over from Glycerol and Water Mixture

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Cancan Fan ◽  
Xitao Wang ◽  
Huanxin Sang ◽  
Fen Wang
Keyword(s):  
Solid Solution ◽  
Hydrogen Production ◽  
Calcination Temperature ◽  
Uv Light ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Glycerol Solution ◽  
Water Mixture ◽  
Impregnation Method ◽  
Catalyst Composition

A series of sulfide coupled semiconductors supported on SiO2, (), was prepared by incipient wet impregnation method. The photocatalysts were characterized by XRD, XPS, TPR, and UV/Vis DRS. Characterization results show that the chemical actions between ZnS and CdS resulted in the formation of solid solutions on the surface of the support and the formation of them is affected by the molar ratio of ZnS/CdS and calcination temperature. Performance of photocatalysts was tested in the home made reactor under both UV light and solar-simulated light irradiation by detecting the rate of the photocatalytic H2evolution from glycerol solution. The hydrogen production rates are related to the catalyst composition, surface structure, photoabsorption property, as well as the amount of solid solution. The maximum rate of hydrogen production, 550 μmol·h−1under UV light irradiation and 210 μmol·h−1under solar-simulated light irradiation, was obtained over Cd0.8Zn0.2S/SiO2solid solution calcined at 723 K.

scholarly journals Catalytic Properties of Pure and K+-Doped CuO/MgO System Towards 2-Propanol Conversion

2017 ◽  
Vol 57 (1) ◽  
Author(s):  
Sahar A. El-Molla ◽  
Gamil A. El-Shobaky ◽  
Nabil H. Amin ◽  
Mohamed N. Hammed ◽  
Sahar N. Sultan
Keyword(s):  
Catalytic Activity ◽  
Calcination Temperature ◽  
Isopropyl Alcohol ◽  
Catalytic Properties ◽  
Impregnation Method ◽  
Minor Phase ◽  
Selective Catalyst ◽  
Surface Areas ◽  
Mgo Support ◽  
Adsorption Of N2

CuO/MgO system having different compositions was prepared by impregnation method followed by calcination at 400-900 °C. The effect of CuO content, calcination temperature and doping with small amounts of K<sup>+</sup> species (1-3 mol %) on physicochemical, surface and catalytic properties of the system were investigated using XRD, adsorption of N2 at -196 °C, and conversion of isopropyl alcohol at 150-400 °C using a flow technique. The results revealed that the solids having the formulae 0.2 and 0.3 CuO/MgO calcined at 400 °C consisted of nanosized MgO and CuO as major phases together with Cu<sub>2</sub>O as minor phase. The BET-surface areas of different adsorbents are decreased by increasing CuO content, calcination temperature and K<sup>+</sup>- doping. MgO-support material showed very small catalytic activity in 2-propanol conversion. The investigated system behaved as selective catalyst for dehydrogenation of 2-propanol with selectivity &gt; 80%. The catalytic activity increased by increasing CuO content and decreased by increasing the calcination temperature within 400-900 °C. K<sup>+</sup> - doping increased the catalytic activity and catalytic durability.

Influence of Calcination Temperature on Nano-TiO$lt;inf$gt;2$lt;/inf$gt; Photocatalyst Synthesized by Gliding Arc Plasma

2015 ◽  
Vol 30 (2) ◽  
pp. 189
Author(s):  
LIU Shi-Xin ◽  
LI Xiao-Song ◽  
DENG Xiao-Qing ◽  
SUN Zhi-Guang ◽  
ZHU Ai-Min
Keyword(s):  
Calcination Temperature ◽  
Arc Plasma ◽  
Gliding Arc ◽  
Gliding Arc Plasma

(CeO2-ZrO2-Al2O3)-(La2O3-Al2O3) Complex Oxide Supported Pd Close-Coupled Catalysts: Effects of Support Calcination Temperature

2013 ◽  
Vol 33 (6) ◽  
pp. 1014-1019
Author(s):  
Ruimei FANG ◽  
Shengnan HE ◽  
Yajuan CUI ◽  
Zhonghua SHI ◽  
Maochu GONG ◽  
...  
Keyword(s):  
Calcination Temperature ◽  
Complex Oxide ◽  
Supported Pd

Hydrogenolytic cleavage of pyridine on different cobalt-molybdenum and nickel-tungsten catalysts

1981 ◽  
Vol 46 (6) ◽  
pp. 1348-1354 ◽  
Author(s):  
Mirko Černý ◽  
Miloš Kraus
Keyword(s):  
Reaction Products ◽  
Hydrogenation Activity ◽  
Catalyst Composition ◽  
Tungsten Catalysts ◽  
Nickel Tungsten ◽  
And Tungsten

Composition of the reaction products formed by hydrogenation of pyridine at 300 °C and 15 MPa in the presence of 15 sulphided and unsulphided molybdenum and tungsten catalysts promoted by cobalt and by nickel, respectively, using alumina as the support in most cases, has been examined. It has been proved that the catalyst composition affects both its hydrogenation activity and the ratio of transalkylation to cracking (or hydrocracking) reactions. Relations between the catalyst composition and its activity and selectivity found for the reaction of pyridine differ from those reported for hydrogenolytic cleavage of thiophene, hydrogenation and isomerization of cyclohexene.

Role of the Structure and Electronic Properties of Fe2O3-MoO3 Catalyst on the Dehydration of Isopropyl Alcohol

1993 ◽  
Vol 58 (7) ◽  
pp. 1591-1599 ◽  
Author(s):  
Abd El-Aziz A. Said
Keyword(s):  
Active Sites ◽  
Isopropyl Alcohol ◽  
Oxide Catalyst ◽  
Flow System ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalyst Composition ◽  
Surface Active

Molybdenum oxide catalyst doped or mixed with (1 - 50) mole % Fe3+ ions were prepared. The structure of the original samples and the samples calcined at 400 °C were characterized using DTA, X-ray diffraction and IR spectra. Measurements of the electrical conductivity of calcined samples with and without isopropyl alcohol revealed that the conductance increases on increasing the content of Fe3+ ions up to 50 mole %. The activation energies of charge carriers were determined in presence and absence of the alcohol. The catalytic dehydration of isopropyl alcohol was carried out at 250 °C using a flow system. The results obtained showed that the doped or mixed catalysts are active and selective towards propene formation. However, the catalyst containing 40 mole % Fe3+ ions exhibited the highest activity and selectivity. Correlations were attempted to the catalyst composition with their electronic and catalytic properties. Probable mechanism for the dehydration process is proposed in terms of surface active sites.

Physicochemical and Catalytic Properties of Spinels Formed by Solid-Solid Interaction Between Fe2O3and V2O5

1996 ◽  
Vol 61 (8) ◽  
pp. 1131-1140 ◽  
Author(s):  
Abd El-Aziz Ahmed Said
Keyword(s):  
Vanadium Oxide ◽  
Active Sites ◽  
Catalyst Surface ◽  
Catalytic Properties ◽  
Flow System ◽  
Oxide Catalysts ◽  
X Ray Diffraction ◽  
Selective Catalyst ◽  
X Ray ◽  
Solid Catalysts

Vanadium oxide catalysts doped or mixed with 1-50 mole % Fe3+ ions were prepared. The structure of the original samples and those calcined from 200 up to 500 °C were characterized by TG, DTA, IR and X-ray diffraction. The SBET values and texture of the solid catalysts were investigated. The catalytic dehydration-dehydrogenation of isopropanol was carried out at 200 °C using a flow system. The results obtained showed an observable decrease in the activity of V2O5 on the addition of Fe3+ ions. Moreover, Fe2V4O13 is the more active and selective catalyst than FeVO4 spinels. The results were correlated with the active sites created on the catalyst surface.

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