scholarly journals Experimental Study of Iraqi Light Naphtha Isomerization over Ni-Pt/H-Mordenite

2019 ◽  
Vol 20 (4) ◽  
pp. 61-66
Author(s):  
Halah M. Hussain ◽  
Abdulhaleem A.K. Mohammed
Keyword(s):  
Experimental Study ◽  
Reaction Temperature ◽  
Atmospheric Pressure ◽  
Octane Number ◽  
Space Velocity ◽  
Molar Ratio ◽  
Light Naphtha ◽  
Temperature Range ◽  
Liquid Hourly Space Velocity

Hydroisomerization of Iraqi light naphtha was studied on prepared Ni-Pt/H-mordenite catalyst at a temperature range of 220-300°C, hydrogen to hydrocarbon molar ratio of 3.7, liquid hourly space velocity (LHSV) 1 hr-1 and at atmospheric pressure. The result shows that the hydrisomerization of light naphtha increases with the increase in reaction temperature at constant LHSV. However, above 270 0C the isomers formation decreases and the reaction is shifted towards the hydrocracking reaction, a higher octane number of naphtha was formed at 270 °C.

Dimethyldisulphide Hydrodesulphurization on NiCoMo / Al2O3 Catalyst

2017 ◽  
Vol 68 (7) ◽  
pp. 1496-1500
Author(s):  
Rami Doukeh ◽  
Mihaela Bombos ◽  
Ancuta Trifoi ◽  
Minodora Pasare ◽  
Ionut Banu ◽  
...  
Keyword(s):  
Good Accuracy ◽  
Fixed Bed ◽  
Continuous System ◽  
Space Velocity ◽  
Molar Ratio ◽  
Catalytic Reactor ◽  
Liquid Hourly Space Velocity ◽  
Hydrodesulfurization Process ◽  
Al2o3 Catalyst ◽  
Simplified Kinetic Model

Hydrodesulphurization of dimethyldisulphide was performed on Ni-Co-Mo /�-Al2O3 catalyst. The catalyst was characterized by determining the adsorption isotherms, the pore size distribution and the acid strength. Experiments were carried out on a laboratory echipament in continuous system using a fixed bed catalytic reactor at 50-100�C, pressure from 10 barr to 50 barr, the liquid hourly space velocity from 1h-1 to 4h-1 and the molar ratio H2 / dimethyldisulphide 60/1. A simplified kinetic model based on the Langmuir�Hinshelwood theory, for the dimethyldisulphide hydrodesulfurization process of dimethyldisulphide has been proposed. The results show the good accuracy of the model.

Effect of Fe and Co promoters on CO methanation activity of nickel catalyst prepared by impregnation – co-precipitation method

2020 ◽  
Vol 18 (5-6) ◽  
Author(s):  
Buyan-Ulzii Battulga ◽  
Tungalagtamir Bold ◽  
Enkhsaruul Byambajav
Keyword(s):  
Synergetic Effect ◽  
Space Velocity ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Alumina Support ◽  
Co Methanation ◽  
Temperature Range ◽  
Co Precipitation ◽  
Catalyst Distribution

AbstractNi based catalysts supported on γ-Al2O3 that was unpromoted (Ni/γAl2O3) or promoted (Ni–Fe/γAl2O3, Ni–Co/γAl2O3, and Ni–Fe–Co/γAl2O3) were prepared using by the impregnation – co-precipitation method. Their catalytic performances for CO methanation were studied at 3 atm with a weight hourly space velocity (WHSV) of 3000 ml/g/h of syngas with a molar ratio of H2/CO = 3 and in the temperature range between 130 and 350 °C. All promoters could improve nickel distribution, and decreased its particle sizes. It was found that the Ni–Co/γAl2O3 catalyst showed the highest catalytic performance for CO methanation in a low temperature range (<250 °C). The temperatures for the 20% CO conversion over Ni–Co/γAl2O3, Ni–Fe/γAl2O3, Ni–Fe–Co/γAl2O3 and Ni/γAl2O3 catalysts were 205, 253, 263 and 270 °C, respectively. The improved catalyst distribution by the addition of cobalt promoter caused the formation of β type nickel species which had an appropriate interacting strength with alumina support in the Ni–Co/γAl2O3. Though an addition of iron promoter improved catalyst distribution, the methane selectivity was lowered due to acceleration of both CO methanation and WGS reaction with the Ni–Fe/γAl2O3. Moreover, it was found that there was no synergetic effect from the binary Fe–Co promotors in the Ni–Fe–Co/γAl2O3 on catalytic activity for CO methanation.

Influence Factors of Denitration Study on Catalyst Mn-Ce/TiO2

2013 ◽  
Vol 634-638 ◽  
pp. 526-530
Author(s):  
Chun Xiang Geng ◽  
Qian Qian Chai ◽  
Wei Yao ◽  
Chen Long Wang
Keyword(s):  
Reaction Temperature ◽  
Catalytic Reduction ◽  
Removal Rate ◽  
Load Capacity ◽  
Fixed Bed ◽  
Influence Factors ◽  
Space Velocity ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Ammonia Gas

Selective Catalytic Reduction (SCR) processes have been one of the most widely used denitration methods at present and the property of low tempreture catalyst becomes a hot research. The Mn-Ce/TiO2 catalyst was prepared by incipient impregnation method. The influence of load capacity, reaction temperature, O2 content, etc. on denitration were studied by a fixed bed catalyst reactor with ammonia gas. Results showed that catalyst with load capacity 18% performed high NO removal rate of 90% at conditions of reaction temperature 160°C, low space velocity, NH3/NO molar ratio 1: 1, O2 concentration 6%.

scholarly journals CO2 Methanation of Biogas over 20 wt% Ni-Mg-Al Catalyst: on the Effect of N2, CH4, and O2 on CO2 Conversion Rate

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1201
Author(s):  
Danbee Han ◽  
Yunji Kim ◽  
Hyunseung Byun ◽  
Wonjun Cho ◽  
Youngsoon Baek
Keyword(s):  
Reaction Temperature ◽  
Photoelectron Spectroscopy ◽  
Conversion Rate ◽  
Space Velocity ◽  
Molar Ratio ◽  
Co2 Conversion ◽  
X Ray Diffraction ◽  
Co2 Methanation ◽  
X Ray ◽  
Ch4 Production

Biogas contains more than 40% CO2 that can be removed to produce high quality CH4. Recently, CH4 production from CO2 methanation has been reported in several studies. In this study, CO2 methanation of biogas was performed over a 20 wt% Ni-Mg-Al catalyst, and the effects of CO2 conversion rate and CH4 selectivity were investigated as a function of CH4, O2, H2O, and N2 compositions of the biogas. At a gas hourly space velocity (GHSV) of 30,000 h−1, the CO2 conversion rate was ~79.3% with a CH4 selectivity of 95%. In addition, the effects of the reaction temperature (200–450 °C), GHSV (21,000–50,000 h−1), and H2/CO2 molar ratio (3–5) on the CO2 conversion rate and CH4 selectivity over the 20 wt% Ni-Mg-Al catalyst were evaluated. The characteristics of the catalyst were analyzed using Brunauer–Emmett–Teller surface area analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The catalyst was stable for approximately 200 h at a GHSV of 30,000 h−1 and a reaction temperature of 350 °C. CO2 conversion and CH4 selectivity were maintained at 75% and 93%, respectively, and the catalyst was therefore concluded to exhibit stable activity.

Study on CO2 Hydrogenation to Light Olefins on Iron Catalysts

2011 ◽  
Vol 347-353 ◽  
pp. 808-811 ◽  
Author(s):  
Cheng Xue Wang ◽  
Xiang Bo Wang
Keyword(s):  
Catalytic Activity ◽  
Calcination Temperature ◽  
Reaction Temperature ◽  
Space Velocity ◽  
Light Olefins ◽  
Iron Catalysts ◽  
Molar Ratio ◽  
Factors Of Influence ◽  
Xrd And Tem

Fe-Cu-K2O-La2O3catalysts were prepared by special impregnation on the SiO2, ZrO2and SiO2-ZrO2. Some factors of influence on catalytic activity were researched,such as the content of active component Cu and La, calcination temperature, reaction temperature and space velocity. The structures and physicochemical properties of the catalysts were characterized by XRD and TEM. When the SiO2-ZrO2play the role of carrier , Fe:Cu:K:La = 100:15:7:7:250:250, the calcination temperature is 773K, the reaction temperature is 613K and space velocity is 2400ml • h-1• g-1(cat), the catalyst shows the best catalytic activity , if the reaction pressure is 0.1 Mpa , and the molar ratio of H2to CO2is 3 . The conversion of CO2is more than 64%. Light olefin’s selectivity is more than 25%.

Removal of Vapor-Phase Elemental Mercury over a CuO/AC Catalyst

2012 ◽  
Vol 610-613 ◽  
pp. 64-67
Author(s):  
Jun Wei Wang ◽  
Xue Jun Kong ◽  
Rong Bin Du ◽  
Yanjie Dong
Keyword(s):  
Removal Efficiency ◽  
Vapor Phase ◽  
Reaction Temperature ◽  
Elemental Mercury ◽  
Space Velocity ◽  
Oxidation Activity ◽  
Temperature Range ◽  
Activated Coke

Removal of vapor-phase elemental mercury (Hg0) over an activated coke (AC) and activated coke supported CuO catalyst (CuO/AC) were studied under N2+HCl atmosphere. This paper describes the influences of CuO loading, reaction temperature, Hg0 concentration and space velocity on Hg0 removal over CuO/AC. It was found that CuO/AC had a higher Hg0 removal capability than that of AC, which can be attributed to the oxidation activity of CuO. The capability of CuO/AC for Hg0 removal increased with an increase of CuO loading (1-20 wt.%). The Hg0 removal capability was the highest at around 180 °C in the temperature range of 120-200 °C, which can be due to the co-effect of adsorption and oxidation. As Hg0 concentration and space velocity decreased, the Hg0 removal efficiency increased.

Hydrogen Production by Catalytic Steam Reforming of Model Compounds of Biomass Fast Pyrolysis Oil

2010 ◽  
Vol 1279 ◽  
Author(s):  
P. Lan ◽  
Q. L. Xu ◽  
L. H. Lan ◽  
Y. J. Yan ◽  
J. A. Wang
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Space Velocity ◽  
Molar Ratio ◽  
Hydrogen Yield ◽  
Pyrolysis Oil ◽  
Model Compounds ◽  
Liquid Hourly Space Velocity ◽  
Bio Oil ◽  
Catalytic Steam Reforming

AbstractA Ni/MgO-La2O3-Al2O3 catalyst with Ni as active component, Al2O3 as support, MgO and La2O3 as additives was prepared and its catalytic activity was evaluated in the process of hydrogen production from catalytic steam reforming of bio-oil. In the catalytic evaluation, some typical components present in bio-oil such as acetic acid, butanol, furfural, cyclopentanone and m-cresol were mixed following a certain proportion as model compounds. Reaction parameters like temperature, steam to carbon molar ratio and liquid hourly space velocity were studied with hydrogen yield as index. The optimal reaction conditions were obtained as follows: temperature 750-850 °C, steam to carbon molar ratio 5-9, liquid hourly space velocity 1.5-2.5 h-1. The maximum hydrogen yield was 88.14%. The carbon deposits were formed on the catalyst surface but its content decreased as reaction temperature increased in the bio-oil steam reforming process.

Steam Reforming of Benzene over Modified Ni/olivine Catalyst

2011 ◽  
Vol 236-238 ◽  
pp. 389-393
Author(s):  
Xiao Qin Yang ◽  
Shao Ping Xu ◽  
Shuang Quan Zhang
Keyword(s):  
Catalytic Activity ◽  
Reaction Temperature ◽  
Steam Reforming ◽  
Catalyst Activity ◽  
Space Velocity ◽  
Ni Catalysts ◽  
Physiochemical Properties ◽  
Mo Catalyst ◽  
Liquid Hourly Space Velocity ◽  
Aluminate Cement

Steam reforming of benzene was carried out over Ni catalysts supported on modified olivine (MO). The MO was prepared by moulding olivine powder with calcium aluminate cement followed by calcination. It was found that calcination temperature of the support significantly influenced its physiochemical properties and the catalyst activity. The effects of reaction temperature, steam to carbon ratio (S/C) and liquid hourly space velocity (LHSV) on the catalytic activity were studied. The Ni/MO catalyst was shown to be very active at the reaction temperature above 750 °C. A close to 100% C-conversion was obtained at the conditions with reaction temperature 800 °C, LHSV 0.8 h–1and S/C ratio 2.5. No obvious deactivation of the catalyst was observed during 500 min stability test.

scholarly journals THE CONVERSION OF ETHANOL ON THE HZSM-5 ZEOLITE MODIFIED WITH LANTHANUM

2021 ◽  
pp. 55-60
Author(s):  
B.A. Babayeva ◽  
Keyword(s):  
Atmospheric Pressure ◽  
Octane Number ◽  
Ethanol Conversion ◽  
Substantial Impact ◽  
Temperature Range ◽  
Flow Type

The conversion of ethanol to hydrocarbons in the presence of lanthanum-modified ZSM-5 zeolite in the temperature range 3000 – 4500C at flow-type atmospheric pressure was studied and it was shown that the modification of ZSM-5 zeolite and imposed temperature affect the distribution of ethanol conversion products. Modification of HZSM-5 zeolite with lanthanum plays an important role in increasing the yield of isoparaffin hydrocarbons, as well as has a substantial impact on the quality and octane number of the catalyst. The catalyst obtained from the conversion of ethanol at 3000 – 3500C complies with the Euro-5 standard for the content of benzene (<1.0%), aromatic (<30%) and olefin (<2.0%) hydrocarbons

scholarly journals CO2 Methanation of Biogas Over 20 wt% Ni-Mg-Al Catalyst: On the Effect of N2, CH4, and O2 on CO2 Conversion Rate

2020 ◽  
Author(s):  
Danbee Han ◽  
Yunji Kim ◽  
Hyunseung Byun ◽  
Wonjun Cho ◽  
Youngsoon Baek
Keyword(s):  
Reaction Temperature ◽  
Photoelectron Spectroscopy ◽  
Conversion Rate ◽  
Space Velocity ◽  
Bet Surface Area ◽  
Molar Ratio ◽  
Co2 Conversion ◽  
Co2 Methanation ◽  
X Ray ◽  
Ch4 Production

Biogas contains more than 40% CO2 that can be removed to produce high quality CH4. Recently, CH4 production from CO2 methanation has been reported in several studies. In this study, CO2 methanation of biogas was performed over a 20 wt% Ni-Mg-Al catalyst, and the effects of CO2 conversion rate and CH4 selectivity were investigated as a function of CH4, O2, H2O, and N2 compositions of the biogas. At a gas hourly space velocity (GHSV) of 30,000/h, the CO2 conversion rate was ~79.3% with a CH4 selectivity of 95%. In addition, the effects of the reaction temperature (200&ndash;450 &deg;C), GHSV (21,000&ndash;50,000/h), and H2/CO2 molar ratio (3&ndash;5) on the CO2 conversion rate and CH4 selectivity over the 20 wt% Ni-Mg-Al catalyst were evaluated. The characteristics of the catalyst were analyzed using Brunauer-Emmett-Teller (BET) surface area analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The catalyst was stable for approximately 200 h at a GHSV of 30,000/h and a reaction temperature of 350 &deg;C. CO2 conversion and CH4 selectivity were maintained at 75% and 93%, respectively, and the catalyst was therefore concluded to exhibit stable activity.

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