Kinetics of Oxidative Cracking of n‐Hexane to Light Olefins using Lattice Oxygen of a VO x /SrO‐γAl 2 O 3 Catalyst

2021 ◽  
Author(s):  
Hussein K. Amusa ◽  
Sagir Adamu ◽  
Abeer S. Arjah ◽  
Saad A. Al‐Bogami ◽  
Sameer Al‐Ghamdi ◽  
...  
Keyword(s):  
Lattice Oxygen ◽  
Light Olefins ◽  
Oxidative Cracking ◽  
Kinetics Of

High-performance VOx on SrO-γAl2O3 catalyst for oxidative cracking of n-hexane to light olefins under anaerobic environment

2020 ◽  
Vol 89 ◽  
pp. 339-350
Author(s):  
Hussein K. Amusa ◽  
Sagir Adamu ◽  
Idris A. Bakare ◽  
Abeer S. Arjah ◽  
Saad A. Al-Bogami ◽  
...  
Keyword(s):  
High Performance ◽  
Light Olefins ◽  
Oxidative Cracking ◽  
Anaerobic Environment

scholarly journals Understanding Hydrodechlorination of Chloromethanes. Past and Future of the Technology

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1462
Author(s):  
Sichen Liu ◽  
Javier A. Otero ◽  
Maria Martin-Martinez ◽  
Daniel Rodriguez-Franco ◽  
Juan J. Rodriguez ◽  
...  
Keyword(s):  
Catalyst Deactivation ◽  
Global Analysis ◽  
Catalytic Performance ◽  
Operating Conditions ◽  
Light Olefins ◽  
Synthesis Methods ◽  
Chlorinated Pollutants ◽  
New Perspective ◽  
Kinetics Of ◽  
Experimental And Theoretical Studies

Chloromethanes are a group of volatile organic compounds that are harmful to the environment and human health. Abundant studies have verified that hydrodechlorination might be an effective treatment to remove these chlorinated pollutants. The most outstanding advantages of this technique are the moderate operating conditions used and the possibility of obtaining less hazardous valuable products. This review presents a global analysis of experimental and theoretical studies regarding the hydrodechlorination of chloromethanes. The catalysts used and their synthesis methods are summarized. Their physicochemical properties are analyzed in order to deeply understand their influence on the catalytic performance. Moreover, the main causes of the catalyst deactivation are explained, and prevention and regeneration methods are suggested. The reaction systems used and the effect of the operating conditions on the catalytic activity are also analyzed. Besides, the mechanisms and kinetics of the process at the atomic level are reviewed. Finally, a new perspective for the upgrading of chloromethanes, via hydrodechlorination, to valuable hydrocarbons for industry, such as light olefins, is discussed.

Kinetics of oxidative cracking of n-hexane to olefins over VOx/Ce-Al2O3under gas phase oxygen-free environment

AIChE Journal ◽  
2016 ◽  
Vol 63 (1) ◽  
pp. 130-138 ◽  
Author(s):  
AbdAlwadood H. Elbadawi ◽  
Muhammad Y. Khan ◽  
Mohammad R. Quddus ◽  
Shaikh A. Razzak ◽  
Mohammad M. Hossain
Keyword(s):  
Gas Phase ◽  
Oxidative Cracking ◽  
Free Environment ◽  
Kinetics Of

scholarly journals Boosting Lattice Oxygen Oxidation of Perovskite to Efficiently Catalyze Oxygen Evolution Reaction by FeOOH Decoration

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Jia-Wei Zhao ◽  
Cheng-Fei Li ◽  
Zi-Xiao Shi ◽  
Jie-Lun Guan ◽  
Gao-Ren Li
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Lattice Oxygen ◽  
Intrinsic Activity ◽  
Fast Reaction ◽  
Synergistic Catalysis ◽  
Slow Kinetics ◽  
Oxygen Oxidation ◽  
Kinetics Of

In the process of oxygen evolution reaction (OER) on perovskite, it is of great significance to accelerate the hindered lattice oxygen oxidation process to promote the slow kinetics of water oxidation. In this paper, a facile surface modification strategy of nanometer-scale iron oxyhydroxide (FeOOH) clusters depositing on the surface of LaNiO3 (LNO) perovskite is reported, and it can obviously promote hydroxyl adsorption and weaken Ni-O bond of LNO. The above relevant evidences are well demonstrated by the experimental results and DFT calculations. The excellent hydroxyl adsorption ability of FeOOH-LaNiO3 (Fe-LNO) can obviously optimize OH- filling barriers to promote lattice oxygen-participated OER (LOER), and the weakened Ni-O bond of LNO perovskite can obviously reduce the reaction barrier of the lattice oxygen participation mechanism (LOM). Based on the above synergistic catalysis effect, the Fe-LNO catalyst exhibits a maximum factor of 5 catalytic activity increases for OER relative to the pristine perovskite and demonstrates the fast reaction kinetics (low Tafel slope of 42 mV dec-1) and superior intrinsic activity (TOFs of ~40 O2 S-1 at 1.60 V vs. RHE).

scholarly journals Dissociate lattice oxygen redox reactions from capacity and voltage drops of battery electrodes

2020 ◽  
Vol 6 (6) ◽  
pp. eaaw3871 ◽  
Author(s):  
Jinpeng Wu ◽  
Zengqing Zhuo ◽  
Xiaohui Rong ◽  
Kehua Dai ◽  
Zachary Lebens-Higgins ◽  
...  
Keyword(s):  
High Efficiency ◽  
Lattice Oxygen ◽  
X Ray Scattering ◽  
Voltage Drops ◽  
Stability Issue ◽  
Voltage Fade ◽  
The Stability ◽  
Oxygen Oxidation ◽  
Capacity Drop ◽  
Kinetics Of

The oxygen redox (OR) activity is conventionally considered detrimental to the stability and kinetics of batteries. However, OR reactions are often confused by irreversible oxygen oxidation. Here, based on high-efficiency mapping of resonant inelastic x-ray scattering of both the transition metal and oxygen, we distinguish the lattice OR in Na0.6[Li0.2Mn0.8]O2 and compare it with Na2/3[Mg1/3Mn2/3]O2. Both systems display strong lattice OR activities but with distinct electrochemical stability. The comparison shows that the substantial capacity drop in Na0.6[Li0.2Mn0.8]O2 stems from non-lattice oxygen oxidations, and its voltage decay from an increasing Mn redox contribution upon cycling, contrasting those in Na2/3[Mg1/3Mn2/3]O2. We conclude that lattice OR is not the ringleader of the stability issue. Instead, irreversible oxygen oxidation and the changing cationic reactions lead to the capacity and voltage fade. We argue that lattice OR and other oxygen activities should/could be studied and treated separately to achieve viable OR-based electrodes.

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