scholarly journals Preparation and performance study of mixed metal oxide catalyst for catalytic removal of toluene

2021 ◽  
Vol 252 ◽  
pp. 02080
Author(s):  
Hongbo Liu ◽  
Zhiyong Huang ◽  
Wenhao Huang ◽  
Chong Li
Keyword(s):  
Low Temperature ◽  
Metal Oxide ◽  
Removal Efficiency ◽  
Catalytic Performance ◽  
Mixed Metal Oxide ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Mixed Metal ◽  
Toluene Removal ◽  
Catalytic Removal

As important pollutant in VOCs, toluene has serious impact on people's health and ed by using hydrotalcite as precursor due to the characteristics of its unique composition and controllable structure. Thus the technical problems of difficult control of structure and high cost of nano catalyst were solved. The mixed metal oxide was used as catalyst for toluene removal and its catalytic performance was studied. The results show that the hydrotalcite precursor with good structure can be obtained by both co-precipitation and hydrothermal method. The well-structured precursor can be synthesized in the range of mole ratios of 0:2:1 to 2:0:1 by different methods. When the reaction temperature is above 80 °C, the reaction speed is fast and the crystalline of hydrotalcite is high. The removal efficiency of toluene by catalyst assisted low temperature plasma is better than that of single low temperature plasma. The best catalytic removal efficiency of toluene is 42.10%, which is 1.8 times higher than that of single low temperature plasma. The order of catalytic performance of different catalysts and low temperature plasma for toluene removal is as follows: Zn-Mg-Al > Cu-Mg-Al > Mg-Al > Co-Mg-Al.

scholarly journals Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 354
Author(s):  
Khadijah H. Alharbi ◽  
Ali Alsalme ◽  
Ahmed Bader A. Aloumi ◽  
Mohammed Rafiq H. Siddiqui
Keyword(s):  
Metal Oxide ◽  
Calcination Temperature ◽  
Aging Time ◽  
Metal Oxide Nanoparticles ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
Mixed Metal Oxide ◽  
Toluene Oxidation ◽  
Mixed Metal ◽  
Selective Catalytic Oxidation

Oxidation is an important organic transformation, and several catalysts have been reported for this conversion. In this study, we report the synthesis of mixed metal oxide CuxZnyO, which is prepared by a coprecipitation method by varying the molar ratio of Cu and Zn in the catalytic system. The prepared mixed metal oxide CuxZnyO was evaluated for catalytic performance for toluene oxidation. Various parameters of the catalytic evaluation were studied in order to ascertain the optimum condition for the best catalytic performance. The results indicate that aging time, calcination temperature, reaction temperature, and feed rate influence catalytic performance. It was found that the catalyst interfaces apparently enhanced catalytic activity for toluene oxidation. The XRD diffractograms reveal the crystalline nature of the mixed metal oxide formed and also confirm the coexistence of hexagonal and monoclinic crystalline phases. The catalyst prepared by aging for 4 h and calcined at 450 °C was found to be the best for the conversion of toluene to benzaldehyde while the reactor temperature was maintained at 250 °C with toluene fed into the reactor at 0.01 mL/min. The catalyst was active for about 13 h.

scholarly journals Eco-Friendly Mechanochemical Preparation of Ag2O–MnO2/Graphene Oxide Nanocomposite: An Efficient and Reusable Catalyst for the Base-Free, Aerial Oxidation of Alcohols

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 281 ◽  
Author(s):  
Syed Farooq Adil ◽  
Mohamed E. Assal ◽  
Mujeeb Khan ◽  
Mohammed Rafi Shaik ◽  
Mufsir Kuniyil ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Metal Oxide ◽  
Surface Area ◽  
Metal Oxide Nanoparticles ◽  
Catalytic Performance ◽  
High Specific Surface Area ◽  
Mixed Metal Oxide ◽  
Reusable Catalyst ◽  
Mixed Metal ◽  
Aerial Oxidation

Recently, the development of eco-friendly mechanochemical approaches for the preparation of novel catalysts with enhanced activity and selectivity has gained considerable attention. Herein, we developed a rapid and solvent-less mechanochemical method for the preparation of mixed metal oxide (Ag2O–MnO2) decorated graphene oxide (GRO)-based nanocomposites (Ag2O–MnO2/(X wt.%)GRO), as the Ag2O–MnO2/(X wt.%)GRO nanocomposite was fabricated by the physical grinding of freshly prepared GRO and pre-annealed (300 °C) mixed metal oxide nanoparticles (NPs) (Ag2O–MnO2) using an eco-friendly milling procedure. The as-prepared nanocatalysts were characterized by using various techniques. Furthermore, the nanocomposites were applied as a heterogeneous catalyst for the oxidation of alcohol by employing gaseous O2 as an eco-friendly oxidant under base-free conditions. The mechanochemically obtained GRO-based composite exhibited noticeable enhancement in the surface area and catalytic performance compared to the pristine Ag2O–MnO2. The results revealed that (1%)Ag2O–MnO2/(5 wt.%)GRO catalyst exhibited higher specific performance (13.3 mmol·g−1·h−1) with a 100% conversion of benzyl alcohol (BnOH) and >99% selectivity towards benzaldehyde (BnH) within 30 min. The enhancement of the activity and selectivity of GRO-based nanocatalyst was attributed to the presence of various oxygen-containing functional groups, a large number of defects, and a high specific surface area of GRO. In addition, the as-prepared nanocatalyst also demonstrated excellent catalytic activity towards the conversion of a variety of other alcohols to respective carbonyls under optimal conditions. Besides, the catalyst ((1%)Ag2O–MnO2/(5 wt.%)GRO) could be efficiently recycled six times with no noticeable loss in its performance and selectivity.

A La-doped Mg–Al mixed metal oxide supported copper catalyst with enhanced catalytic performance in transfer dehydrogenation of 1-decanol

2016 ◽  
Vol 45 (3) ◽  
pp. 1093-1102 ◽  
Author(s):  
Ming Zhang ◽  
Yajie Zhao ◽  
Qian Liu ◽  
Lan Yang ◽  
Guoli Fan ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Copper Catalyst ◽  
Catalytic Performance ◽  
Mixed Metal Oxide ◽  
Copper Species ◽  
Mixed Metal ◽  
Basic Sites ◽  
Supported Copper Catalyst ◽  
La Doped ◽  
Excellent Catalytic Performance

A La-doped Mg–Al mixed metal oxide supported copper catalyst exhibited excellent catalytic performance in transfer dehydrogenation of 1-decanol due to the surface cooperation between Lewis basic sites and copper species.

scholarly journals Low Temperature Plasma-Enhanced Atomic Layer Deposition of Metal Oxide Thin Films

2019 ◽  
Vol 25 (4) ◽  
pp. 233-242 ◽  
Author(s):  
Stephen E. Potts ◽  
Luc R. Van den Elzen ◽  
Gijs Dingemans ◽  
Erik Langereis ◽  
Wytze Keuning ◽  
...  
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Atomic Layer Deposition ◽  
Metal Oxide ◽  
Atomic Layer ◽  
Low Temperature Plasma ◽  
Oxide Thin Films ◽  
Temperature Plasma ◽  
Metal Oxide Thin Films ◽  
Layer Deposition

Topochemical modifications of mixed metal oxide compounds by low-temperature fluorination routes

2013 ◽  
Vol 33 (2-3) ◽  
pp. 105-117 ◽  
Author(s):  
Oliver Clemens ◽  
Peter R. Slater
Keyword(s):  
Low Temperature ◽  
Metal Oxide ◽  
Point Of View ◽  
Mixed Metal Oxide ◽  
Fluoride Ions ◽  
Mixed Metal ◽  
Wide Range ◽  
Recent Developments ◽  
Bond Valence Sum ◽  
Structural Point

AbstractIn this review, we discuss recent developments in the use of low-temperature fluorination routes for the topochemical modification of mixed metal oxide compounds. By applying such methods, material properties (such as magnetism, superconductivity, electrical conductivity, and ionic conductivity) can be tuned in a wide range. Furthermore, oxide fluoride compounds are interesting from a structural point of view, and while differentiating between oxide and fluoride ions has proved to be difficult using diffraction methods, strategies (e.g., bond valence sum calculations) to overcome this problem have been shown to be possible. In addition, this review concludes with an outlook on future prospects in the field of oxide fluoride compounds.

scholarly journals Low Temperature Plasma-Enhanced Atomic Layer Deposition of Metal Oxide Thin Films

2010 ◽  
Vol 157 (7) ◽  
pp. P66 ◽  
Author(s):  
S. E. Potts ◽  
W. Keuning ◽  
E. Langereis ◽  
G. Dingemans ◽  
M. C. M. van de Sanden ◽  
...  
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Atomic Layer Deposition ◽  
Metal Oxide ◽  
Atomic Layer ◽  
Low Temperature Plasma ◽  
Oxide Thin Films ◽  
Temperature Plasma ◽  
Metal Oxide Thin Films ◽  
Layer Deposition
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