Synthesis of environmentally benign ultra-small copper nanoclusters-halloysite composites and their catalytic performance on contrasting azo dyes

2021 ◽  
Vol 546 ◽  
pp. 149122
Author(s):  
Amal Kanti Deb ◽  
Bhabananda Biswas ◽  
Nirmal Goswami ◽  
Emily F. Hilder ◽  
Ravi Naidu ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Copper Nanoclusters

scholarly journals Environmentally Benign Neem Biodiesel Synthesis Using Nano-Zn-Mg-Al Hydrotalcite as Solid Base Catalysts

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Karthikeyan Chelladurai ◽  
Manivannan Rajamanickam
Keyword(s):  
Methyl Esters ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Bet Surface Area ◽  
Molar Ratio ◽  
Solid Base ◽  
Synthetic Compound ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Biodiesel Synthesis

Hydrotalcite, also known as aluminum-magnesium layered double hydroxide (LDH) or anionic clay, is a synthetic compound that was broadly investigated in the past decade due to its many potential applications. In this work, we present an environmentally benign process for the transesterification (methanolysis) of neem oil to fatty acid methyl esters (FAME) using Zn-Mg-Al hydrotalcites as solid base catalysts in a heterogeneous manner. The catalysts were characterized by XRD, FT-IR, TPD-CO2, and the BET surface area analysis. It is well-known that the catalytic performance of hydrotalcite is dramatically increased through the incorporation of Zn into the surface of Mg-Al hydrotalcite material. The optimized parameters, 10 : 1 methanol/oil molar ratio with 7.5 g catalysts reacted under stirring speed 450 rpm at 65°C for 4 h reaction, gave a maximum ester conversion of 90.5% for the sample with Zn-Mg-Al ratio of 3 : 3 : 1.

scholarly journals Synthesis, Characterization and Catalytic Performance ofH3SiW12O40/SiO2Prepared by Sol-Gel Technique

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
W. N. R. W. Isahak ◽  
M. Ismail ◽  
N. M. Nordin ◽  
J. M. Jahim ◽  
M. A. Yarmo
Keyword(s):  
Heteropoly Acid ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Sol Gel ◽  
Acid Catalyst ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Esterification Reaction ◽  
Silicotungstic Acid ◽  
Gel Technique

The purpose of this work is to study the synthesis, characterization, and catalytic performance of two types of solid heteropoly acid catalysts, namely, silicotungstic acid bulk (STAB) and STA-silica sol-gel (STA-SG) compared with sulfuric acid. From the XPS analyses, there was a significant formation of W-O-Si, W-O-W, and Si-O-Si bonding in STA-SG compared to that in STAB. The main spectra of O1s (90.74%, 531.5 eV) followed by other O1s peak (9.26%, 532.8 eV) were due to the presence of W-O-W and W-O-Si bonds, respectively. The STA-SG catalyst was found to be the more environmentally benign solid acid catalyst for the esterification reaction between oleic acid and glycerol due to its lower toxicity supported by silica via sol-gel technique. In addition, the ease of separation for STA-SG catalyst was attributed to its insoluble state in the product phase. The esterification products were then analysed by FTIR and HPLC. Both the H2SO4and the STAB gave high conversion of 100% and 98% but at a lower selectivity of GME with 81.6% and 89.9%, respectively. On the contrary, the STA-SG enabled a conversion of 94% but with a significantly higher GME selectivity of 95%, rendering it the more efficient solid acid catalyst.

Hierarchically porous covalent organic frameworks assembled in ionic liquids for highly effective catalysis of C–C coupling reactions

2020 ◽  
Vol 22 (8) ◽  
pp. 2605-2612 ◽  
Author(s):  
Jikuan Qiu ◽  
Huiyong Wang ◽  
Yuling Zhao ◽  
Pengxin Guan ◽  
Zhiyong Li ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Bond Formation ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Coupling Reactions ◽  
Covalent Organic Frameworks ◽  
Hierarchically Porous ◽  
Highly Effective ◽  
Bond Formation Reactions

A simple and environmentally benign strategy was reported for the synthesis of hierarchically porous COFs in ionic liquids, and the obtained materials show highly effective catalytic performance for C–C bond formation reactions.

Rational design of biogenic PdxAuy nanoparticles with enhanced catalytic performance for electrocatalysis and azo dyes degradation

2021 ◽  
pp. 112086
Author(s):  
Jin-Feng Ma ◽  
Ya-Nan Hou ◽  
Jianbo Guo ◽  
Hafiz Muhammad Adeel Sharif ◽  
Cong Huang ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Rational Design ◽  
Catalytic Performance ◽  
Dyes Degradation

Environmentally Benign Approach for the Synthesis of Azo Dyes in the Presence of Mesoporous Sulfated Core‐Shell Zirconia‐Copper(I) Oxide Solid Acid Catalyst

2019 ◽  
Vol 4 (17) ◽  
pp. 5097-5105 ◽  
Author(s):  
Lakshminarayana Parashuram ◽  
Swamy Sreenivasa ◽  
Sathyanarayana Rao Akshatha ◽  
Velu Udaya Kumar ◽  
Sandeep Kumar
Keyword(s):  
Azo Dyes ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Environmentally Benign ◽  
Core Shell

Facile synthesis of a Ag(i)-doped coordination polymer with enhanced catalytic performance in the photodegradation of azo dyes in water

2015 ◽  
Vol 3 (11) ◽  
pp. 5908-5916 ◽  
Author(s):  
Fan Wang ◽  
Fu-Ling Li ◽  
Miao-Miao Xu ◽  
Hong Yu ◽  
Jian-Guo Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Coordination Polymer ◽  
Azo Dyes ◽  
Azo Dye ◽  
Catalytic Performance ◽  
Facile Synthesis

Immersing {[Pb(Tab)2(bpe)]2(PF6)4}n into AgNO3 solution produced a Ag(i)-doped coordination polymer {[Pb(Tab)2(bpe)]2(PF6)4·1.64AgNO3}n, which enhanced the catalytic activity towards azo dye photodegradation.

Manganese oxides with hierarchical structures derived from coordination polymers and their enhanced catalytic activity at low temperature for selective catalytic reduction of NOx

2019 ◽  
Vol 48 (43) ◽  
pp. 16395-16401 ◽  
Author(s):  
Byeonggab Ji ◽  
Junhyung Lee ◽  
Seung-Yeop Kwak
Keyword(s):  
Catalytic Activity ◽  
Coordination Polymer ◽  
Manganese Oxides ◽  
Preparation Method ◽  
Catalytic Reduction ◽  
Hierarchical Structures ◽  
Cost Effective ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Reduction Of Nox

Hierarchical manganese oxides for enhancing catalytic performance have been successfully synthesized via simple thermal annealing manganese coordination polymer, which is a facile, cost-effective, and environmentally benign preparation method.

Efficient three-component coupling reactions catalyzed by Cu0-nanoparticles stabilized on modified montmorillonite

2014 ◽  
Vol 4 (4) ◽  
pp. 1047-1054 ◽  
Author(s):  
Bibek Jyoti Borah ◽  
Subrat Jyoti Borah ◽  
Lakshi Saikia ◽  
Dipak Kumar Dutta
Keyword(s):  
Catalytic Performance ◽  
Montmorillonite Clay ◽  
Environmentally Benign ◽  
Coupling Reactions ◽  
Modified Montmorillonite ◽  
Three Component Coupling

In situgeneration of Cu0-nanoparticles into the nanopores of environmentally benign modified montmorillonite clay and their catalytic performance in three component (A3) coupling reactions of aldehyde, amine and alkyne to synthesize propargylamines with excellent yields and selectivity.

Photocatalytic performance and mechanism insights of a S-scheme g-C3N4/Bi2MoO6 heterostructure in phenol degradation and hydrogen evolution reactions under visible light

2020 ◽  
Vol 22 (45) ◽  
pp. 26278-26288
Author(s):  
Yanzhong Zhen ◽  
Chunming Yang ◽  
Huidong Shen ◽  
Wenwen Xue ◽  
Chunrong Gu ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Rational Design ◽  
Photocatalytic Performance ◽  
Low Cost ◽  
Phenol Degradation ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Sustainable Utilization ◽  
Hydrogen Evolution Reactions ◽  
Performance And Mechanism

Photocatalysis with sustainable utilization and low cost is an environmentally benign method for the degradation of organic pollutants, but the rational design and fabrication of photocatalysts with high catalytic performance is still an challenge.

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