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

Application of Fe3O4@SiO2/(CH2)3-[imidazolium-SO3H]Cl as a robust, magnetically recoverable solid acid catalyst for the facile preparation of arylbispyranylmethanes

2017 ◽  
Vol 95 (12) ◽  
pp. 1248-1252 ◽  
Author(s):  
Mohammad Ali Zolfigol ◽  
Mahdiyeh Navazeni ◽  
Meysam Yarie ◽  
Roya Ayazi-Nasrabadi
Keyword(s):  
Effective Potential ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Aromatic Aldehydes ◽  
Core Shell ◽  
Synthetic Procedure ◽  
Three Component Reaction ◽  
Facile Preparation ◽  
Green Conditions

In this study, Fe3O4@SiO2/(CH2)3-[imidazolium-SO3H]Cl shows robust promoting capability in the synthesis of arylbispyranylmethane derivatives under mild and green conditions. Arylbispyranylmethanes were synthesized via efficient three-component reaction of various aromatic aldehydes with 4-hydroxy-6-methyl-2H-pyran-2-one. The nanomagnetic core-shell catalyst presented effective potential of at least eight times recycling applicability in the described synthetic procedure.

Sorbitol dehydration into isosorbide over a cellulose-derived solid acid catalyst

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 49528-49536 ◽  
Author(s):  
Jie Zou ◽  
Dong Cao ◽  
Weitong Tao ◽  
Shaoyin Zhang ◽  
Li Cui ◽  
...  
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Environmentally Benign

The dehydration of sorbitol to isosorbide over an environmentally benign cellulose-derived solid acid catalyst (CCS) has been investigated in order to develop a sustainable process for isosorbide production.

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.

Envirocat EPZ-10: An Efficient Catalyst for the Synthesis of 1,2,4- Triazolidine-3-thiones

2020 ◽  
Vol 17 (4) ◽  
pp. 321-326
Author(s):  
Pradeep M. Mhaldar ◽  
Dattaprasad M. Pore
Keyword(s):  
Present Method ◽  
Room Temperature ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Environmentally Benign ◽  
Temperature Synthesis ◽  
Efficient Catalyst ◽  
Green Catalyst ◽  
Catalyst Reusability

A simple and environmentally benign room temperature synthesis of 1,2,4-triazolidine-3- thiones is described using Envirocat EPZ-10R as a solid acid catalyst in the aqueous medium. The use of Envirocat EPZ-10R as a green catalyst, reusability of the catalyst, water as a universal solvent and good yields of the product are the attractive features of the present method.

BF3/nano-sawdust as a green, biodegradable and inexpensive catalyst for the synthesis of highly substituted dihydro-2-oxopyrroles

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15566-15571 ◽  
Author(s):  
Bi Bi Fatemeh Mirjalili ◽  
Reza Zare Reshquiyea
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Environmentally Benign ◽  
One Pot ◽  
The One ◽  
Heterogeneous Solid

BF3/nano-sawdust was used as a readily available, inexpensive, biodegradable and environmentally benign heterogeneous solid acid catalyst for the one-pot cascade synthesis of highly functionalized dihydro-2-oxypyrroles.

Core–shell Fe3O4@SiO2@HNbMoO6 nanocomposites: new magnetically recyclable solid acid for heterogeneous catalysis

2015 ◽  
Vol 3 (7) ◽  
pp. 3456-3464 ◽  
Author(s):  
P. Shen ◽  
H. T. Zhang ◽  
H. Liu ◽  
J. Y. Xin ◽  
L. F. Fei ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Self Assembly ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Core Shell ◽  
Layer By Layer ◽  
Assembly Process ◽  
Modified Layer

A modified layer-by-layer self-assembly process was developed to fabricate magnetically recyclable solid acid catalyst for acetalization and acetalization reactions.

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