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.

Corrosion inhibiting action of Ni–Mo alloy coatings in the presence of mixed metal oxide nanocomposites

2018 ◽  
Vol 42 (16) ◽  
pp. 13660-13666 ◽  
Author(s):  
Jenice Jean Goveas ◽  
Sandhya Shetty ◽  
Naveen Praveen Mascarenhas ◽  
Ampar Chitharanjan Hegde ◽  
Richard Adolf Gonsalves
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Mixed Metal Oxide ◽  
Oxide Nanoparticles ◽  
Corrosion Properties ◽  
Mixed Metal ◽  
Inhibiting Action ◽  
Electrodeposition Method

Enhanced anti-corrosion properties of Ni–Mo alloy coatings by addition of mixed metal oxide nanoparticles via an electrodeposition method.

Amorphous Co–Cu–Al mixed metal oxide nanoparticles modified BiVO4 to improve photocatalytic desulfurization

2019 ◽  
Vol 6 (9) ◽  
pp. 096205
Author(s):  
Ying Zhang ◽  
Lei Shi ◽  
Zhongxing Geng ◽  
Tieqiang Ren ◽  
Zongbao Yu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Mixed Metal Oxide ◽  
Oxide Nanoparticles ◽  
Mixed Metal

scholarly journals Mixed metal oxide nanoparticles inhibit growth of Mycobacterium tuberculosis into THP-1 cells

2016 ◽  
Vol 5 ◽  
pp. S181-S183 ◽  
Author(s):  
A.R. Jafari ◽  
T. Mosavi ◽  
N. Mosavari ◽  
A. Majid ◽  
F. Movahedzade ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Mixed Metal Oxide ◽  
Oxide Nanoparticles ◽  
Mixed Metal

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.

ZnO@SnO2 Mixed Metal Oxide as an Efficient and Recoverable Nanocatalyst for the Solvent Free Synthesis of Hantzsch 1,4-Dihydropyridines

2019 ◽  
Vol 16 (2) ◽  
pp. 139-144 ◽  
Author(s):  
Bharatkumar M. Sapkal ◽  
Prakash K. Labhane ◽  
Shamrao T. Disale ◽  
Dhananjay H. More
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Reaction Times ◽  
Solvent Free ◽  
Catalyst Loading ◽  
Mixed Metal Oxide ◽  
One Pot ◽  
Mixed Metal ◽  
Solvent Free Conditions ◽  
Three Component Reaction

An efficient synthesis of Hantzsch 1,4-dihydropyridines via a one-pot three-component reaction of ethyl acetoacetate, substituted aldehydes and ammonium acetate in the presence of ZnO@SnO2 mixed metal oxide nanoparticles under solvent-free conditions has been reported. Compare to the reported reactions, this method shows attractive aspects such as cleaner reaction profile, shorter reaction times, minimum catalyst loading and high yields. Isolated catalysts were reused for new reactions without considerable loss of their catalytic activity.

Synthesis–structure correlations of manganese–cobalt mixed metal oxide nanoparticles

2016 ◽  
Vol 25 (2) ◽  
pp. 278-281 ◽  
Author(s):  
Manuel Gliech ◽  
Arno Bergmann ◽  
Camillo Spöri ◽  
Peter Strasser
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Mixed Metal Oxide ◽  
Oxide Nanoparticles ◽  
Mixed Metal ◽  
Structure Correlations

Synthesis of TixSn1-xO2 mixed metal oxide for copper catalysts as high-efficiency NH3 selective catalytic oxidation

Fuel ◽  
2022 ◽  
Vol 314 ◽  
pp. 123061
Author(s):  
Shiwei Ge ◽  
Xiaoqing Liu ◽  
Jun Liu ◽  
Hao Liu ◽  
Haiyan Liu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Catalytic Oxidation ◽  
High Efficiency ◽  
Copper Catalysts ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Selective Catalytic Oxidation
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