Selective and Stable In-Promoted Fe Catalyst for Syngas Conversion to Light Olefins

ACS Catalysis ◽  
2021 ◽  
pp. 15177-15186
Author(s):  
Yang He ◽  
Hanzhong Shi ◽  
Olusola Johnson ◽  
Babu Joseph ◽  
John N. Kuhn
Keyword(s):  
Light Olefins ◽  
Syngas Conversion ◽  
Fe Catalyst

scholarly journals Syngas conversion to light olefins over magnetite catalysts prepared from various iron salts.

1985 ◽  
Vol 28 (2) ◽  
pp. 176-179
Author(s):  
Kiyomi OKABE ◽  
Tsuneji SANO ◽  
Hiroshi YANAGISAWA ◽  
Hiroyuki HAGIWARA ◽  
Michio ARAKI ◽  
...  
Keyword(s):  
Light Olefins ◽  
Syngas Conversion ◽  
Iron Salts

Role of Manganese Oxide in Syngas Conversion to Light Olefins

ACS Catalysis ◽  
2017 ◽  
Vol 7 (4) ◽  
pp. 2800-2804 ◽  
Author(s):  
Yifeng Zhu ◽  
Xiulian Pan ◽  
Feng Jiao ◽  
Jian Li ◽  
Junhao Yang ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Light Olefins ◽  
Syngas Conversion

scholarly journals Syngas conversion on calcined Fe-Ti-Zn-K catalysts. Part 2. Direct conversion of synthesis gas to light olefins in the slurry phase.

1985 ◽  
Vol 28 (2) ◽  
pp. 148-155 ◽  
Author(s):  
Kiyomi OKABE ◽  
Tsuneji SANO ◽  
Kenji SAITOH ◽  
Hiroyuki HAGIWARA ◽  
Michio ARAKI ◽  
...  
Keyword(s):  
Synthesis Gas ◽  
Direct Conversion ◽  
Light Olefins ◽  
Syngas Conversion ◽  
Slurry Phase

Effects of preparation method and precipitant on Mn-Ga oxide in combination with SAPO-34 for syngas conversion into light olefins

2021 ◽  
Author(s):  
Guinan Yang ◽  
Fanhui Meng ◽  
Peng Zhang ◽  
Langlang Yang ◽  
Zhong Li
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Preparation Method ◽  
Light Olefins ◽  
Syngas Conversion

Since the metal oxide plays an important role in adsorption and activation of CO and H2, the binary Mn-Ga metal oxides were prepared and combined with SAPO-34 to study the...

Role of SAPO-18 Acidity in Direct Syngas Conversion to Light Olefins

ACS Catalysis ◽  
2020 ◽  
Vol 10 (21) ◽  
pp. 12370-12375 ◽  
Author(s):  
Gen Li ◽  
Feng Jiao ◽  
Xiulian Pan ◽  
Na Li ◽  
Dengyun Miao ◽  
...  
Keyword(s):  
Light Olefins ◽  
Syngas Conversion

Study of syngas conversion to light olefins by statistical models

Fuel ◽  
2014 ◽  
Vol 123 ◽  
pp. 205-210 ◽  
Author(s):  
Mehdi Shiva ◽  
Hossein Atashi ◽  
Ali Akbar Mirzaei ◽  
Maryam Arsalanfar ◽  
Akbar Zare
Keyword(s):  
Statistical Models ◽  
Light Olefins ◽  
Syngas Conversion

scholarly journals Study of Syngas Conversion to Light Olefins by Response Surface Methodology

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Hossein Atashi ◽  
Mehdi Shiva ◽  
Farshad Farshchi Tabrizi ◽  
Ali Akbar Mirzaei
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Fixed Bed ◽  
Optimization Procedure ◽  
Product Distribution ◽  
Catalytic Performance ◽  
Light Olefins ◽  
Chain Growth ◽  
Syngas Conversion ◽  
Chain Growth Probability

The effect of adding MgO to a precipitated iron-cobalt-manganese based Fischer-Tropsch synthesis (FTS) catalyst was investigated via response surface methodology. The catalytic performance of the catalysts was examined in a fixed bed microreactor at a total pressure of 1–7 bar, temperature of 280–380°C, MgO content of 5–25% and using a syngas having a H2to CO ratio equal to 2.The dependence of the activity and product distribution on MgO content, temperature, and pressure was successfully correlated via full quadratic second-order polynomial equations. The statistical analysis and response surface demonstrations indicated that MgO significantly influences the CO conversion and chain growth probability as well as ethane, propane, propylene, butylene selectivity, and alkene/alkane ratio. A strong interaction between variables was also evidenced in some cases. The decreasing effect of pressure on alkene to alkane ratio is investigated through olefin readsorption effects and CO hydrogenation kinetics. Finally, a multiobjective optimization procedure was employed to calculate the best amount of MgO content in different reactor conditions.

Mechanistic Insights into Fe Catalyzed α-C-H Oxidations of Tertiary Amines

2019 ◽  
Author(s):  
Christopher J. Legacy ◽  
Frederick T. Greenaway ◽  
Marion Emmert
Keyword(s):  
Free Radical ◽  
Catalytic Mechanism ◽  
Catalyst System ◽  
Oxidation Products ◽  
Tertiary Amines ◽  
Catalyst Activation ◽  
Rate Determining Step ◽  
Fe Catalyst ◽  
Ligand Coordination ◽  
Rate Kinetics

We report detailed mechanistic investigations of an iron-based catalyst system, which allows the α-C-H oxidation of a wide variety of amines, including acyclic tertiary aliphatic amines, to afford dealkylated or amide products. In contrast to other catalysts that affect α-C-H oxidations of tertiary amines, the system under investigation employs exclusively peroxy esters as oxidants. More common oxidants (e.g. tBuOOH) previously reported to affect amine oxidations via free radical pathways do not provide amine α-C-H oxidation products in combination with the herein described catalyst system. Motivated by this difference in reactivity to more common free radical systems, the investigations described herein employ initial rate kinetics, kinetic profiling, Eyring studies, kinetic isotope effect studies, Hammett studies, ligand coordination studies, and EPR studies to shed light on the Fe catalyst system. The obtained data suggest that the catalytic mechanism proceeds through C-H abstraction at a coordinated substrate molecule. This rate-determining step occurs either at an Fe(IV) oxo pathway or a 2-electron pathway at a Fe(II) intermediate with bound oxidant. We further show via kinetic profiling and EPR studies that catalyst activation follows a radical pathway, which is initiated by hydrolysis of PhCO3 tBu to tBuOOH in the reaction mixture. Overall, the obtained mechanistic data support a non-classical, Fe catalyzed pathway that requires substrate binding, thus inducing selectivity for α-C-H functionalization.<br>

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

2020 ◽  
Vol 23 ◽  
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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