Effects of Temperature and Initial Hydrogen Pressure on the Hydriding Properties of Zr9Ni11 Alloy

2013 ◽  
Vol 42 (9) ◽  
pp. 1790-1794
Author(s):  
Hu Yanze ◽  
Dan Guiping ◽  
Du Liang ◽  
Zhang Dong ◽  
Mao Benjiang
Keyword(s):  
Hydrogen Pressure ◽  
Initial Hydrogen Pressure ◽  
Effects Of Temperature

Hydrogenation of methylacetylene. III. The reaction of methylacetylene with hydrogen catalyzed by nickel, copper, and their alloys

1968 ◽  
Vol 46 (4) ◽  
pp. 623-633 ◽  
Author(s):  
R. S. Mann ◽  
K. C. Khulbe
Keyword(s):  
Activation Energy ◽  
Nickel Catalyst ◽  
Hydrogen Pressure ◽  
Constant Volume ◽  
Temperature Dependent ◽  
Nickel Copper ◽  
Wide Range ◽  
Initial Hydrogen Pressure

The reaction between methylacetylene and hydrogen over unsupported nickel, copper, and their alloys has been investigated in a static constant volume system between 20 and 220 °C for a wide range of reactant ratios. The order of reaction with respect to hydrogen was one and nearly independent of temperature. While the order of reaction with respect to methylacetylene over nickel catalyst was slightly negative and temperature dependent, it was always positive and nearly independent of temperature for copper and copper-rich alloys. Selectivity was independent of initial hydrogen pressure for nickel and copper only; for others it decreased rapidly with increasing hydrogen pressure. The overall activation energy varied between 9 and 21.2 kcal/g mole. Selectivity and extent of polymerization increased with increasing amount of copper in the alloy.

Pd/SiO2–AlPO4 systems. Influence of the preparation variables on their catalytic activity

1985 ◽  
Vol 63 (12) ◽  
pp. 3471-3477 ◽  
Author(s):  
A. Alba ◽  
M. A. Aramendia ◽  
V. Borau ◽  
C. Jimenez ◽  
J. M. Marinas
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Reaction Temperature ◽  
Hydrogen Pressure ◽  
Pd Catalysts ◽  
Metal Precursor ◽  
Preparation Conditions ◽  
Liquid Phase Hydrogenation ◽  
Initial Hydrogen Pressure ◽  
Catalyst Reduction

A study on the liquid phase hydrogenation of cyclohexene over a series of Pd catalysts supported on various SiO2–AlPO4 systems (using a concentration of 2.47 M, with methanol as solvent, the initial hydrogen pressure is 5 bar and reaction temperature 300 K) is reported in this paper. The reaction has been studied as a standard in order to determine the most suitable preparation conditions for these catalystsWe have also studied the influence of other factors such as the kind of support, the nature of the metal precursor, the previous calcination of the precursor, the addition of alkaline hydroxides, and the catalyst reduction with various agents, on the catalytic activity of different Pd-supported systems

Catalytic Activity and Physical Properties of Nanoparticles Metal Supported on Bentonite for Hydrogenolysis of Glycerol

2011 ◽  
Vol 364 ◽  
pp. 211-216
Author(s):  
Noraini Hamzah ◽  
Wan Nor Roslam Wan Isahak ◽  
Nadia Farhana Adnan ◽  
Nor Asikin Mohamad Nordin ◽  
Mohamad Bin Kassim ◽  
...  
Keyword(s):  
High Activity ◽  
Hydrogen Pressure ◽  
Au Nanoparticles ◽  
Catalyst System ◽  
Impregnation Method ◽  
Tem Analysis ◽  
Glycerol Hydrogenolysis ◽  
Initial Hydrogen Pressure ◽  
Catalyst Acidity ◽  
Average Size

Catalysts prepared from a variety of noble metal (Os, Ru, Pd and Au) supported on bentonite using impregnation method were studied and it found these series catalyst system gave different activity and selectivity. Among these catalysts, Os/bentonite and Ru/bentonite catalyst showed high activity in glycerol hydrogenolysis reaction at 150°C, 2.0 MPa initial hydrogen pressure for 7 hours. TEM analysis revealed that these nanometal particles catalyst have different in size and result showed that Os and Ru which have smaller average size in range 1-3 nm gave high activity which are 54.1% and 61.2% respectively. In contrast, less activity was obtained when using Pd/bentonite (29.0%) and Au/bentonite (27.8%) catalyst and TEM result showed that Pd and Au nanoparticles have large average particles size (8-10) nm. NH3-TPD analysis revealed that Ru/bentonite and Os/bentonite catalyst gave high total acidity and this behaviour contribute to high activity of the catalyst. This study revealed that size of nanoparticles and catalyst acidity play an important role in the activity and selectivity in glycerol hydrogenolysis reaction. These catalysts were also characterized by BET, XRD and XPS in order to get some physicochemical properties of the catalyst.

Application of Hydrogen Storage Materials in Hydrogenation of Coal-Derived Preasphaltene

2011 ◽  
Vol 236-238 ◽  
pp. 668-671
Author(s):  
Shi Gang Kang ◽  
Zhi Min Zong ◽  
Heng Fu Shui ◽  
Zhi Cai Wang ◽  
Xian Yong Wei
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Pressure ◽  
Structural Characteristics ◽  
Gas Oil ◽  
Hydrogen Storage Materials ◽  
Reaction Conditions ◽  
Storage Materials ◽  
Heavy Product ◽  
Initial Hydrogen Pressure ◽  
Increasing Temperature

The hydrogenation of preasphaltene (PA), from Chinese Xiaolongtan lignite liquefied heavy product, was investigated with hydrogen storage materials in a batch autoclave. The effects of reaction conditions such as hydrogen storage materials and temperature on the yields of gas+oil, asphaltene, char and the conversions of preasphaltene were discussed. Preliminary studies indicate that increasing temperature not only improves hydrogen donor performance of hydrogen storage materials but also enhances conversion of feedstock PA and gas+oil yield. The conversion of PA and the yield gas+oil get to 72.02% and 41.46%, respectively, under 5% MgH2, 5MPa initial hydrogen pressure, temperature 420°C and reaction time 30min. Meanwhile MgH2 is stronger than NaBH4 in hydrodeoxygenation of PA under the same conditions. Elemental and FTIR analyses were used to illustrate the structural characteristics of feedstock PA and remaining preasphaltene (RPA).

THE EFFECT OF TIME AND TEMPERATURE ON THE HYDROGENATION OF ASPEN LIGNIN

1963 ◽  
Vol 41 (11) ◽  
pp. 2867-2875 ◽  
Author(s):  
J. M. Pepper ◽  
Warren Steck
Keyword(s):  
Hydrogen Pressure ◽  
Gas Liquid Chromatography ◽  
Alkyl Ether ◽  
Klason Lignin ◽  
Aryl Ether ◽  
Soluble Product ◽  
Raney Nickel Catalyst ◽  
Initial Hydrogen Pressure ◽  
Relationship Of ◽  
The Relationship

A study has been made of the hydrogenation of preextracted aspen sapwood meal under conditions whereby the lignin is degraded to identifiable products. By gas liquid chromatography, guaiacol, 4-methylguaiacol, 4-ethylguaiacol, 4-n-propylguaiacol, dihydroconiferyl alcohol, syringol, 4-methylsyringol, 4-ethylsyringol, 4-n-propylsyringol, and dihydrosinapyl alcohol were separated and identified.The relative abundance of these 10 compounds was determined in the chloroform-soluble product after hydrogenation using a dioxane–water (1:1) solvent medium, Raney nickel catalyst, an initial hydrogen pressure of 500 p.s.i. and temperatures of 150°, 165°, 185°, 195°, 210°, and 220° for a reaction time of 5 hours and a temperature of 195° for times of 0, 1.3, 5.0, and 24 hours. The best yield (52.2% of the Klason lignin) of such phenolic derivatives was obtained at a reaction temperature of 195° for 5 hours.The significance of the observed variation in the yields of these compounds with time and temperature and the relationship of these yields to the structure of lignin is discussed. Evidence is presented in support of both γ-alkyl ether and β-aryl ether linkages in the lignin substance.

scholarly journals Effect of Pretreatment with Sulfuric Acid on Catalytic Hydrocracking of Fe/AC Catalysts

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Ruiyu Wang ◽  
Fei Wang ◽  
Ling Liu
Keyword(s):  
Hydrogen Pressure ◽  
Bituminous Coal ◽  
Model Compound ◽  
Synergetic Effect ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Initial Hydrogen Pressure ◽  
Adsorption Desorption ◽  
Scanning Electron

Activated carbon (AC) was modified by H2SO4 and used as a support for catalyst. The Fe2S3/AC-T catalyst was prepared by deposition-precipitation method and used to catalyze hydrocracking of coal-related model compound, di(1-naphthyl)methane (DNM). The properties of catalyst were studied by N2 adsorption-desorption, X-ray diffraction, and scanning electron microscopy. The result showed that ferric sulfate and acidic centers had synergetic effect on hydrocracking of DNM when using Fe2S3/AC-T as catalyst, the optimal loading of Fe is 9 wt.%. Hydroconversion of the extraction residue from Guizhou bituminous coal was also studied using Fe2S3/AC-T as the catalyst. The reaction was conducted in cyclohexane under 0.8 Mpa of initial hydrogen pressure at 310°C. The reaction mixture was extracted with petroleum ether and analyzed by GC/MS. Amounts of organic compounds which fall into the categories of homologues of benzene and naphthalene were detected. It suggested that the catalyst could effectively catalyze the cleavage of C-C-bridged bonds.

The reaction of 2-butyne with hydrogen catalyzed by nickel, copper, cobalt, iron, and nickel–copper alloys

1970 ◽  
Vol 48 (13) ◽  
pp. 2075-2089 ◽  
Author(s):  
R. S. Mann ◽  
C. P. Khulbe
Keyword(s):  
Copper Alloy ◽  
Hydrogen Pressure ◽  
Copper Alloys ◽  
Kcal Mole ◽  
Temperature Dependent ◽  
Nickel Cobalt ◽  
Nickel Copper ◽  
Wide Range ◽  
Cobalt Iron ◽  
Initial Hydrogen Pressure

The reaction between hydrogen and 2-butyne over unsupported nickel, copper, cobalt, iron, and nickel–copper alloys has been investigated in a static constant volume system between 30 and 250 °C for a wide range of reactant ratios. The reaction over metals and their alloys is simple hydrogenation, the early stages being principally a selective production of cis-2-butene with small yields of polymers. The order of reaction with respect to hydrogen was one and independent of temperature. While the order of reaction over cobalt and copper with respect to 2-butyne was zero, it was slightly negative and temperature dependent for nickel and nickel–copper alloys. The selectivity was independent of initial hydrogen pressure for nickel, cobalt, copper and most of the nickel–copper alloys. The overall activation energy for nickel, cobalt, and copper were 9.1, 6.6, 33.5 kcal/mole, respectively. Selectivity and extent of polymerization increased with increasing amounts of copper in the nickel–copper alloy.

Effects of temperature and hydrogen pressure on the activation behavior of ZrCo

2016 ◽  
Vol 41 (25) ◽  
pp. 10811-10818 ◽  
Author(s):  
Huaqin Kou ◽  
Wenhua Luo ◽  
Zhiyong Huang ◽  
Ge Sang ◽  
Changwen Hu ◽  
...  
Keyword(s):  
Hydrogen Pressure ◽  
Effects Of Temperature ◽  
Activation Behavior

scholarly journals IDENTIFIKASI PRODUK TURUNAN HYDROPROCESSING MODEL MINYAK SINTETIS BATUBARA MENGGUNAKAN GC-FID/NPD/MS

2010 ◽  
Vol 6 (1) ◽  
Author(s):  
Muhammad Hanif ◽  
Yusnitati Yusnitati ◽  
Nasikin Nataadmadja
Keyword(s):  
Gas Chromatography ◽  
Reaction Temperature ◽  
Hydrogen Pressure ◽  
Selective Adsorption ◽  
Hydrogenation Reaction ◽  
Flame Ionization ◽  
Aromatic Hydrogenation ◽  
Initial Hydrogen Pressure ◽  
Butyl Benzene

An analysis of identifying a derivative product of liquefied coal modelhydroprocessing was conducted. For that purpose, an integration gaschromatography flame ionization-nitrogen phosphorous detector and massspectrometry (GC-FID/NPD/MS) was used. Hydroprocessing process wasperformed by vibrating micro autoclave tipe batch using Ni-W/Alumina catalystunder initial hydrogen pressure 6 MPa, reaction temperature 375oC and one hourretention time. The analysis result showed that the predominant reaction werehydrogenation, hydrodenitrogenation (HDN) and hydrodeoxygenation (HDO).The HDO of methyl phenol and ethyl phenol took place faster than the otherhydroprocessing reactions such as HDN of quinoline and aromatic hydrogenation(butyl benzene, naphthalene, phenanthrene dan pyrene). This indicates that thehydrogenation reaction or the cleavage of C-O bonding took place very fast thatalkyl could not be detected in the oil. The HDN reaction or the cleavage of C-Ntook place slower but the the nitrogen containing compound vanished faster dueto selective adsorption of the catalyst. However the hydrogenation reaction ofmono-aromatic took place faster than poly-aromaticKata kunci: gas chromatography, identifikasi senyawa, model minyak sintetis

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