Experimental Design-Assisted Investigation of Light Olefins Production Over Ceria-Altered HZSM-5 Catalysts by Naphtha Catalytic Steam Cracking

Abstract In this contribution, the effects of ceria loading, Si/Al ratio, and reaction temperature on the catalytic performance of HZSM-5 catalysts for production of ethylene and propylene from light naphtha were investigated. The elaborated catalysts were characterized by XRD, FTIR, SEM, and BET specific surface area. The acquired results demonstrated that HZSM-5 structure was preserved after ceria addition. XRD patterns exhibited a crystallinity degradation of HZSM-5 samples by aluminum addition. Box-Behnken experimental design was utilized with central composite design for investigation of parameters such as reaction temperature (600–700 °C), cerium loading (2–14 wt%), and Si/Al ratio (25–125) in ethylene and propylene production. Analysis of variance (ANOVA) indicated the significance of the studied parameters and the corresponding interactions. The results exhibited that the highest ethylene yield was at the highest reaction temperature, the highest cerium loading, and the lowest Si/Al ratio. The superior propylene yield was attained at the highest Si/Al ratio whereas an optimum can be found for reaction temperature and cerium loading.

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Optimization of Linoleic Acid Monoepoxidation Condition from Malaysian Jatropha curcas Using Central Composite Design (CCD)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.754-755.1107 ◽

2015 ◽

Vol 754-755 ◽

pp. 1107-1112

Author(s):

Rozaini Abdullah ◽

Jumat Salimon ◽

Anis Atikah Ahmad

Keyword(s):

Linoleic Acid ◽

Reaction Time ◽

Experimental Design ◽

Central Composite Design ◽

Reaction Temperature ◽

Jatropha Curcas ◽

Catalyst Loading ◽

Time Saving ◽

Independent Variable ◽

Central Composite

The aim of this study was to optimize the monoepoxidation process of linoleic acid obtained from Malaysian Jatropha curcas oil using central composite design (CCD). There were four independent variable factors had been studied which involved reaction temperature (X1), reaction time (X2), catalyst loading (X3) and H2O2 concentration (X4). Thirty experiments were carried out based on the experimental design responses obtained. The results showed that the optimum condition was obtained at catalyst loading of 0.11% (w/w) methyltrioxorhernium (VII) (MTO), H2O2 mole of 99%, reaction temperature of 58.41oC for 5 hours. The central composite design was proven to be simpler method, time saving and required less samples compared to the conventional method.

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SEM and BET Methods for Investigating the Structure and Morphology of Co - Ce Catalysts for Production of Light Olefins

Australian Journal of Chemistry ◽

10.1071/ch07130 ◽

2008 ◽

Vol 61 (2) ◽

pp. 144 ◽

Cited By ~ 13

Author(s):

Ali A. Mirzaei ◽

Maryam Galavy ◽

Vahid Eslamimanesh

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Catalytic Performance ◽

Light Olefins ◽

Molar Ratio ◽

Surface Areas ◽

Preparation Conditions ◽

Bet Specific Surface Area ◽

Before And After

Co–Ce catalysts prepared by the coprecipitation method were tested for production of light olefins. The effect of different preparation conditions including the [Co]/[Ce] molar ratio, aging time, calcination conditions, different supports, and loading of optimum support on the structure and catalytic performance of different catalysts were investigated. It was found that catalyst containing 80% Co/20% Ce/15% SiO2, which was aged for 2 h and calcined at 600°C for 6 h, is the optimum modified catalyst for the conversion of synthesis gas to light olefins. Characterization of both precursors and calcined catalysts (before and after the test) was carried out using scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) specific surface area measurements. The morphology of the catalysts was investigated by SEM and the surface areas of these catalysts were studied by BET. It was shown that all of the different preparation variables influenced the morphology and also the specific surface area of the catalyst precursors and calcined catalysts.

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Effect of cerium and zirconium nanoparticles on the structure and catalytic performance of SAPO-34 in steam cracking of naphtha to light olefins

Reaction Kinetics Mechanisms and Catalysis ◽

10.1007/s11144-015-0862-z ◽

2015 ◽

Vol 115 (2) ◽

pp. 719-740 ◽

Cited By ~ 9

Author(s):

Ali Zeinali Varzaneh ◽

Jafar Towfighi ◽

Amir Hossein Shahbazi Kootenaei ◽

Ali Mohamadalizadeh

Keyword(s):

Catalytic Performance ◽

Light Olefins ◽

Steam Cracking

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Structural/Texture Evolution During Facile Substitution of Ni into ZSM-5 Nanostructure vs. its Impregnation Dispersion Used in Selective Transformation of Methanol to Ethylene and Propylene

Combinatorial Chemistry & High Throughput Screening ◽

10.2174/1386207323666200825144543 ◽

2020 ◽

Vol 23 ◽

Cited By ~ 1

Author(s):

Parisa Sadeghpour ◽

Mohammad Haghighi ◽

Mehrdad Esmaeili

Keyword(s):

High Temperature ◽

Physicochemical Properties ◽

Active Sites ◽

Catalytic Performance ◽

Fixed Bed Reactor ◽

Light Olefins ◽

Isomorphous Substitution ◽

Impregnation Method ◽

Hydrothermal Temperature ◽

X Ray

Aim and Objective: Effect of two different modification methods for introducing Ni into ZSM-5 framework was investigated under high temperature synthesis conditions. The nickel successfully introduced into the MFI structures at different crystallization conditions to enhance the physicochemical properties and catalytic performance. Materials and Methods: A series of impregnated Ni/ZSM-5 and isomorphous substituted NiZSM-5 nanostructure catalysts were prepared hydrothermally at different high temperatures and within short times. X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy dispersive X-ray (EDX), Brunner, Emmett and Teller-Barrett, Joyner and Halenda (BET-BJH), Fourier transform infrared (FTIR) and Temperature-programmed desorption of ammonia (TPDNH3) were applied to investigate the physicochemical properties. Results: Although all the catalysts showed pure silica MFI–type nanosheets and coffin-like morphology, using the isomorphous substitution for Ni incorporation into the ZSM-5 framework led to the formation of materials with lower crystallinity, higher pore volume and stronger acidity compared to using impregnation method. Moreover, it was found that raising the hydrothermal temperature increased the crystallinity and enhanced more uniform incorporation of Ni atoms in the crystalline structure of catalysts. TPD-NH3 analysis demonstrated that high crystallization temperature and short crystallization time of NiZSM-5(350-0.5) resulted in fewer weak acid sites and medium acid strength. The MTO catalytic performance was tested in a fixed bed reactor at 460ºC and GHSV=10500 cm3 /gcat.h. A slightly different reaction pathway was proposed for the production of light olefins over impregnated Ni/ZSM-5 catalysts based on the role of NiO species. The enhanced methanol conversion for isomorphous substituted NiZSM-5 catalysts could be related to the most accessible active sites located inside the pores. Conclusion: The impregnated Ni/ZSM-5 catalyst prepared at low hydrothermal temperature showed the best catalytic performance, while the isomorphous substituted NiZSM-5 prepared at high temperature was found to be the active molecular sieve regarding the stability performance.

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Synthesis of SAPO-34 using N-octyl-d-glucamine as additive for enhanced catalytic performance in CH3Br conversion to light olefins

Molecular Catalysis ◽

10.1016/j.mcat.2017.08.003 ◽

2017 ◽

Vol 441 ◽

pp. 109-113 ◽

Cited By ~ 2

Author(s):

Jun Xie ◽

Na Li ◽

Peng Wang ◽

Lang Chen ◽

Chak-Tong Au ◽

...

Keyword(s):

Catalytic Performance ◽

Light Olefins

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Supramolecular solvent-based microextraction method for cobalt traces in food samples with optimization Plackett–Burman and central composite experimental design

RSC Advances ◽

10.1039/c5ra15856g ◽

2015 ◽

Vol 5 (115) ◽

pp. 94879-94886 ◽

Cited By ~ 10

Author(s):

Funda Aydin ◽

Erkan Yilmaz ◽

Mustafa Soylak

Keyword(s):

Experimental Design ◽

Atomic Absorption Spectrometry ◽

Flame Atomic Absorption Spectrometry ◽

Absorption Spectrometry ◽

Optimization Method ◽

Food Samples ◽

Flame Atomic Absorption ◽

Supramolecular Solvent ◽

Central Composite Experimental Design ◽

Central Composite

A new microextraction method based on formation of supramolecular solvent (Ss) was developed by using of chemometric optimization method for cobalt determination with microsampling flame atomic absorption spectrometry (MS-FAAS).

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An Investigation on the Mechanism of TiC+Al2O3 Combustion Synthesis via Mechanical Activation of Double Phases in TiO2-Al-C System

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.273-276.210 ◽

2008 ◽

Vol 273-276 ◽

pp. 210-215 ◽

Cited By ~ 1

Author(s):

Sayed Hamid Reza Fatemi Nayeri ◽

Jalil Vahdati Khaki ◽

Mohammad Reza Aboutalebi

Keyword(s):

Mechanical Activation ◽

Combustion Synthesis ◽

Reaction Temperature ◽

Synthesis Temperature ◽

Synthesis Process ◽

Third Phase ◽

Transmission Electron ◽

Al2o3 Composite ◽

Composite Formation ◽

Xrd Patterns

The starting reaction in the combustion synthesis process in TiO2-Al-C system leading to TiC+Al2O3 composite was evaluated using a combination of Differential Thermal Analysis (DTA), X-Ray Diffraction (XRD) and Transmission Electron Microscope (TEM). Double phases in 3TiO2- 4Al-3C system were milled separately and then the third phase was added according to the stoichiometric reaction for 3TiC+2Al2O3 composite formation. The combustion synthesis temperature was observed to decrease from 962 °C to 649 °C after mechanical activation of TiO2/Al mixture for 16 hr. On the contrary, the mechanical activation of Al/C and TiO2/C mixtures for 16 hr made the reaction temperature increase to 995 °C and 1024 °C, respectively. TEM and XRD patterns of as-milled powders showed that the reaction temperature changes could be due to increased TiO2 and Al interface area. In addition, DTA experiments showed that for the sample in which TiO2 and Al were mechanically activated the reaction occurred at the temperature even lower than the aluminum melting point.

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Optimal Physical Pretreatment Conditions for the Release of Carbohydrate and Protein from Dairy Manure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.291-294.383 ◽

2013 ◽

Vol 291-294 ◽

pp. 383-389

Author(s):

Jian Ping Sun ◽

Jun Zhu

Keyword(s):

Particle Size ◽

Experimental Design ◽

Optimum Condition ◽

Reaction Temperature ◽

Organic Materials ◽

Dairy Manure ◽

Physical Factors ◽

Test Results ◽

Release Rates ◽

Pretreatment Conditions

Various physical factors including particle size, pH, temperature and so on may influence the release of organic materials from dry dairy manure. The effect of these factors on release of protein and carbohydrate was investigated in this study using Box-Behnken Experimental Design with three factors (particle size, temperature and pH) at three levels. Test results suggested that particle size of 0.15-0.25 mm accounted for almost half of the dry manure particles and the optimum condition for release of protein and carbohydrate were pH 2, particle size 1.0-1.4 mm under reaction temperature of 90 oC, under which the protein and carbohydrate release rates could reach 1570.57 and 2813.29 mg l-1, respectively. The degree to which these factors affected organics release was in the order from high to low of temperature > particle size > pH.

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