scholarly journals Optimization of Calcination Conditions for Cu/ZnO/Al2O3-ZrO2 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 871
Author(s):  
Nur Insyirah Zulkifli ◽  
Nor Hafizah Berahim ◽  
Noor Asmawati Mohd Zabidi ◽  
Sara Faiz Hanna Tasfy
Keyword(s):  
Response Surface Methodology ◽  
Pore Volume ◽  
Pore Diameter ◽  
Catalytic Performance ◽  
Hydrogenation Reaction ◽  
Co2 Hydrogenation ◽  
Bet Surface Area ◽  
Co2 Conversion ◽  
Zro2 Catalyst ◽  
Central Composite

Promoted Cu/ZnO catalyst was synthesized on Al2O3-ZrO2 support. Effects of calcination conditions on the catalytic performance in a CO2 hydrogenation reaction were studied systematically using the response surface methodology (RSM). The application of RSM with rotatable central composite design (RCCD) for optimization on the influence of catalyst’s calcination variables on the CO2 conversion and methanol selectivity is presented. The calcination variables studied include temperature, A (181–518 °C), ramping rate, B (1–30 °C/min), and duration, C (1–7 h). From the RSM-generated model, the optimum calcination condition for this catalyst was 350 °C with 17.5 °C/min ramping rate for a 4 h duration. At the optimum calcination condition, the catalyst exhibited a Brunauer–Emmett–Teller (BET) surface area of 147 m2/g, a pore volume of 0.31 cm3/g, and a pore diameter of 8.1 nm.

Effect of magnetic field on CO2 conversion over Cu-ZnO/ZrO2 catalyst in hydrogenation reaction

2016 ◽  
Vol 16 ◽  
pp. 204-211 ◽  
Author(s):  
Waleeporn Donphai ◽  
Nuttanun Piriyawate ◽  
Thongthai Witoon ◽  
Pongsakorn Jantaratana ◽  
Viganda Varabuntoonvit ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hydrogenation Reaction ◽  
Co2 Conversion ◽  
Zro2 Catalyst

Experimental Research on the Preparation of Porous Activated Carbon from Orange Wastes

2009 ◽  
Vol 79-82 ◽  
pp. 1907-1910
Author(s):  
Zhi Gang Xie
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Pore Volume ◽  
Pore Diameter ◽  
Total Pore Volume ◽  
Carbonization Temperature ◽  
Bet Surface Area ◽  
Average Pore ◽  
Impregnation Ratio ◽  
Heat Preservation

Porous activated carbon was prepared from orange wastes using zinc chloride as an activating agent by one-step carbonization method. Effects of impregnation ratio, carbonization temperature and heat preservation time on pore characteristics of activated carbon were studied. The porous structures of the orange wastes activated carbon were investigated by BET, D-R equations, BJH equations and Kelvin theory. The morphology was observed using transmission electron microscopy (TEM). The mesoporous activated carbon is gained when the impregnation ratio is 3:1; the carbonization temperature is 550°Cand heat preservation time is 1.0 h. The activated carbon has total pore volume 2.098 cm3/g, mesoporous pore volume 1.438 cm3/g, with a high BET surface area 1476m2/g. The pore distribution of the mesoporous activated carbon is very concentrative, with average pore diameter of 3.88nm. While, the high specific surface area activated carbon is gained when the impregnation ratio is 2:1; the carbonization temperature is 550°Cand heat preservation time is 1.0 h. The activated carbon has high BET surface area 1909 m2/g, while the total pore volume is only 1.448cm3/g and microporous pore volume is 0.889cm3/g, with average pore diameter of 2.29 nm.

Synthesis of Mesoporous Nickel Phosphate with Long Hollow Nanotubes

2011 ◽  
Vol 399-401 ◽  
pp. 625-628 ◽  
Author(s):  
Juan Tan ◽  
Xu Ying Li ◽  
Fei Yang ◽  
Jing Liu
Keyword(s):  
Surface Area ◽  
Pore Volume ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Bet Surface Area ◽  
N2 Adsorption ◽  
Gel Method ◽  
Sol Gel Method ◽  
Nickel Phosphate ◽  
Ft Ir

Mesostructured nickel phosphate was synthesized with urea as alkali by sol-gel method. The obtained material nominated as NiPO-3 was characterized by means of XRD, ICP, FT-IR, TEM, and N2 adsorption. In contrast to mesoporous nickel phosphate NiPO-1 and NiPO-2 we reported before, NiPO-3 exhibits relatively longer nanotubes reached up to 400~600 nm. N2 adsorption shows that NiPO-3 possesses high BET surface area (345.8 m2g-1) and pore volume (0.46 cm3g-1). The catalytic performance of NiPO-3 showed that the total selectivity of epoxycyclohexane and hexadienol was as high as 83.38%.

scholarly journals Synthesis of Ni3Si4O10(OH)2 Porous Microspheres as Support of Pd Catalyst for Hydrogenation Reaction

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 998 ◽  
Author(s):  
Tingting Wang ◽  
Chenyuan Liu ◽  
Xinxin Ma ◽  
Wancheng Zhu ◽  
Xiaoxia Lv ◽  
...  
Keyword(s):  
Adsorption Property ◽  
Catalytic Performance ◽  
Hydrogenation Reaction ◽  
Bet Surface Area ◽  
Pd Catalyst ◽  
Turnover Frequency ◽  
Porous Microspheres ◽  
Mild Conditions ◽  
Potential Applications ◽  
Supported Pd

Nickel phyllosilicates have attracted much attention owing to their potential applications in various fields. Herein, Ni3Si4O10(OH)2 porous microspheres (NiSi-PMs) with a diameter of 1.2 to 3.2 μm were successfully fabricated via a urea-assisted hydrothermal method, and subsequently used to prepare supported Pd catalyst. Characterizations of the NiSi-PMs and the obtained catalyst, combined with the catalytic performance for the hydrogenation reaction, are presented and discussed. The BET surface area and pore volume of the NiSi-PMs were 196.2 m2 g−1 and 0.70 cm3 g−1, respectively. The Pd/NiSi-PMs catalyst exhibited remarkable catalytic activity for the hydrogenation of styrene under mild conditions, with a turnover frequency of 5234 h−1, and the catalyst was recovered and recycled for six consecutive cycles without any discernible loss of activity. H2-TPR and H2-TPD revealed that the activity of the catalysts was closely related to the adsorption property for hydrogen. The present Ni3Si4O10(OH)2 supported Pd catalyst afforded a promising and competitive candidate for heterogeneous catalysis.

scholarly journals Effects of AKD Sizing on the Morphology and Pore Distribution Properties of OCC Fibers

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Hua Chen ◽  
Jing Yang ◽  
Zhijun Hu ◽  
Bingbing Zheng ◽  
Jun Sun ◽  
...  
Keyword(s):  
Pore Volume ◽  
Pore Diameter ◽  
Control Sample ◽  
Bet Surface Area ◽  
Alkyl Ketene Dimer ◽  
Average Pore ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dispersed Particles ◽  
Scanning Electron

Changes of the morphology and pore structure of old corrugated container (OCC) fibers during an alkyl ketene dimer (AKD) sizing process were studied. The resulting samples were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, and BET surface area analysis. The length of fibers had obvious influence on the AKD sizing effect, and the length of fibers ranged from 100 to 200 meshes showed the best sizing performance. The surface roughness of 0.3% AKD sizing OCC fibers decreased from 27.949 nm to 12.811 nm. Compared with the control sample, the pore volume of fibers sized with 0.1% AKD decreased 4.3% when the average pore diameter was fixed at 2.4~3.0 nm. And when the usage of AKD increased to 0.3% and 0.5%, the pore volume decreased 1.4% and 6.3% accordingly. The decrease in the pore volume of AKD-sized fiber indicated the penetration and deposition of dispersed particles of AKD in the fiber lumens.

scholarly journals Effect of Cu and Cs in the b-Mo2C System for CO2 Hydrogenation to Methanol

2020 ◽  
Author(s):  
Ana Belén Dongil ◽  
Qi zhang ◽  
Laura Pastor-Pérez ◽  
Tomás Ramírez-Reina ◽  
Antonio Guerrero-Ruiz ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Molybdenum Carbide ◽  
Catalytic Performance ◽  
Co2 Hydrogenation ◽  
Main Reaction ◽  
Main Reaction Product ◽  
Co2 Conversion ◽  
Present Communication ◽  
Global Challenge ◽  
Hydrogenation Reactions

Mitigation of Anthropogenic CO2 emissions possess a major global challenge for modern societies. Herein catalytic solutions are meant to play a key role. Among the different catalysts for CO2 conversion Cu supported on molybdenum carbide is receiving increasing attention. Hence, in the present communication we show the activity, selectivity and stability of fresh-prepared -Mo2C catalysts and compare the results with those of Cu/Mo2C, Cs/Mo2C and Cu/Cs/Mo2C in CO2 hydrogenation reactions. The results showed that all the catalysts were active and the main reaction product was methanol. The results showed that copper-cesium and molybdenum effectively interact and that cesium promoted the formation of metallic Mo. While, the incorporation of copper is positive to improve the activity and selectivity to methanol, the presence of Mo0 phase was detrimental for the conversion and selectivity. Moreover, the catalysts promoted by cesium underwent redox surface transformations during the reaction that diminished their catalytic performance. The molybdenum phase in Cu/Mo2C changes during reaction leading to metallic molybdenum and tuning the catalytic activity.

Preparation, Characterization, and Application of Ru-Silica-Ionic Liquid System for CO2 Hydrogenation Reaction

2020 ◽  
Vol 17 (6) ◽  
pp. 443-454
Author(s):  
Prashant Gautam ◽  
Praveenkumar Ramprakash Upadhyay ◽  
Vivek Srivastava
Keyword(s):  
Ionic Liquid ◽  
Catalytic Performance ◽  
Hydrogenation Reaction ◽  
Liquid System ◽  
Co2 Hydrogenation ◽  
Sustainable Chemistry ◽  
Catalyst Recycling ◽  
Ru Nanoparticles ◽  
High Pressure Reaction ◽  
The Impact

A group of silica-ionic liquid supported Ru-based catalysts was synthesized and further utilized for CO2 hydrogenation reaction. All the materials were properly analyzed in terms of their physicochemical properties. The physiochemical impacts of different functionalized and non-functionalized ionic liquid over the synthesis, size, and stability of Ru NPs along with their effect on the rate of hydrogenation reaction were investigated. The Ru-[DAMI][NTf2] (1:10)@SiO2 furnished the best catalytic performance in CO2 conversion to formic acid under high-pressure reaction condition. The results confirmed the impact of ionic liquids as a repellent to avoid agglomeration and oxidation of the Ru nanoparticles followed by space resistance and electrostatic protection. Hence, such influence positively begins the rate of reaction as well as the selectivity of the process. Good physiochemical stability of catalyst in terms of 7-time catalyst recycling and easy product/catalyst isolation make this protocol near to the principal of sustainable chemistry.

In-Co-Zn/C-N catalysts derived from ZIFs for selective hydrogenation of CO2 into methanol

2021 ◽  
Author(s):  
Bing Liu ◽  
Tingfeng Fang ◽  
Yumei He
Keyword(s):  
Methanol Synthesis ◽  
Selective Hydrogenation ◽  
Hydrogenation Reaction ◽  
Co2 Hydrogenation ◽  
Great Promise ◽  
Co2 Conversion ◽  
Hydrogenation Of Co2 ◽  
Low Co2

Recently, In2O3-based catalysts have shown great promise in methanol synthesis from CO2 hydrogenation reaction due to the high methanol selectivity. However, the low CO2 conversion restrict their application. Here, we...

Enzyme-assisted Extraction for Optimized Recovery of Phenolic Bioactives from Peganum hermala Leaves Using Response Surface Methodology

2018 ◽  
Vol 17 (4) ◽  
pp. 349-354
Author(s):  
Qadir Rahman ◽  
Anwar Farooq ◽  
Amjad Gilani Mazhar ◽  
Nadeem Yaqoob Muhammad ◽  
Ahmad Mukhtar
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Enzyme Concentration ◽  
Coumaric Acid ◽  
Assisted Extraction ◽  
Pre Treatment ◽  
Optimized Conditions ◽  
Enzyme Complexes ◽  
Hydrolysis Of ◽  
Central Composite

This study investigates the effect of enzyme formulations (Zympex-014, Kemzyme dry-plus and Natuzyme) on recovery of phenolics from Peganum hermala (harmal) leaves, under optimized conditions using response surface methodology. As compared to the other enzyme complexes, the yield (34 g/100g) obtained through Zympex-014-assisted extraction was higher under optimized conditions such as time (75 min), temperature (70°C), pH (6.5) and enzyme concentration (5 g/100 g) using central composite design (CCD). Effectiveness of Zympex-014 towards hydrolysis of P. hermala leaves cell wall was examined by analyzing the control and enzyme-treated leave residues using scanning electron microscope (SEM). GC/MS characterization authenticated the presence of quercetin (1.44), gallic acid (0.23), caffeic acid (0.04), cinnamic acid (0.05), m-coumaric acid (0.23) and p-coumaric acid (0.37 μg/g) as the potent phenolics in Zympex-014 based extract. It can be concluded from the findings of the current work that pre-treatment of P. hermala leaves with Zympex-014 significantly enhanced the recovery of phenolics that supports its potential uses in the nutra-pharamaceutical industry.

Fuels Desulphurisation by Adsorbtion on Fe / Bentonite

2017 ◽  
Vol 68 (3) ◽  
pp. 483-486
Author(s):  
Constantin Sorin Ion ◽  
Mihaela Bombos ◽  
Gabriel Vasilievici ◽  
Dorin Bombos
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Pore Diameter ◽  
Adsorption Process ◽  
Continuous System ◽  
Gas Oil ◽  
Average Pore ◽  
Atmospheric Distillation

Desulfurisation of atmospheric distillation gasoline and gas oil was performed by adsorption process on Fe/ bentonite. The adsorbent was characterized by determining the adsorption isotherms, specific surface area, pore volume and average pore diameter. Adsorption experiments of atmospheric distillation gasoline and gas oil were performed in continuous system at 280�320oC, 5 atm and volume hourly space velocities of 1�2 h-1. The efficiency of adsorption on Fe / bentonite was better at desulphurisation of gasoline versus gas oil.

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