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.

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.

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

Sulfuric acid functionalized MCM-41 coated on magnetite nanoparticles as a recyclable core–shell solid acid catalyst for three-component condensation of indoles, aldehydes and thiols

RSC Advances ◽  
2014 ◽  
Vol 4 (78) ◽  
pp. 41469-41475 ◽  
Author(s):  
Alireza Khorshidi ◽  
Shahab Shariati
Keyword(s):  
Sulfuric Acid ◽  
Magnetite Nanoparticles ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Core Shell ◽  
Mcm 41

Sulfuric acid functionalized MCM-41 coated on magnetite nanoparticles as a recyclable core–shell catalyst in preparation of 3-[(aryl)(arylthio)methyl]-1H-indoles.

Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60264-60272 ◽  
Author(s):  
Aojie Deng ◽  
Junli Ren ◽  
Huiling Li ◽  
Feng Peng ◽  
Runcang Sun
Keyword(s):  
Heterogeneous Catalysis ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Environmentally Friendly ◽  
Acid Catalyst ◽  
Hydrothermal Pretreatment ◽  
Heterogeneous Catalytic Process ◽  
Step Process ◽  
Heterogeneous Catalytic ◽  
Furfural Production

In this paper, an environmentally-friendly two-step process for furfural production was developed by the hydrothermal pretreatment of corncob and the heterogeneous catalysis of the hydrolysate using a solid acid catalyst.

Synthesis and Characterization of Heterogeneous Solid Acid Catalyst from Alstonia Scolaris Stalks for Biodiesel Production using Waste Cooking Oil

2020 ◽  
Vol 10 ◽  
Author(s):  
Charishma Venkata Sai Anne ◽  
Karthikeyan S. ◽  
Arun C.
Keyword(s):  
Reaction Time ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Waste Cooking Oil ◽  
Biodiesel Production ◽  
Wood Biomass ◽  
Waste Wood ◽  
X Ray ◽  
Cooking Oil

Background: Waste biomass derived reusable heterogeneous acid based catalysts are more suitable to overcome the problems associated with homogeneous catalysts. The use of agricultural biomass as catalyst for transesterification process is more economical and it reduces the overall production cost of biodiesel. The identification of an appropriate suitable catalyst for effective transesterification will be a landmark in biofuel sector Objective: In the present investigation, waste wood biomass was used to prepare a low cost sulfonated solid acid catalyst for the production of biodiesel using waste cooking oil. Methods: The pretreated wood biomass was first calcined then sulfonated with H2SO4. The catalyst was characterized by various analyses such as, Fourier-transform infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDS) and X-ray diffraction (XRD). The central composite design (CCD) based response surface methodology (RSM) was applied to study the influence of individual process variables such as temperature, catalyst load, methanol to oil molar ration and reaction time on biodiesel yield. Results: The obtained optimized conditions are as follows: temperature (165 ˚C), catalyst loading (1.625 wt%), methanol to oil molar ratio (15:1) and reaction time (143 min) with a maximum biodiesel yield of 95 %. The Gas chromatographymass spectrometry (GC-MS) analysis of biodiesel produced from waste cooking oil was showed that it has a mixture of both monounsaturated and saturated methyl esters. Conclusion: Thus the waste wood biomass derived heterogeneous catalyst for the transesterification process of waste cooking oil can be applied for sustainable biodiesel production by adding an additional value for the waste materials and also eliminating the disposable problem of waste oils.

scholarly journals Production of cellulose nanofibrils and films from elephant grass using deep eutectic solvents and a solid acid catalyst

RSC Advances ◽  
2021 ◽  
Vol 11 (23) ◽  
pp. 14071-14078
Author(s):  
Xi-Que Wu ◽  
Pan-Dao Liu ◽  
Qun Liu ◽  
Shu-Ying Xu ◽  
Yu-Cang Zhang ◽  
...  
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Cellulose Nanofibrils ◽  
Acid Catalyst ◽  
Deep Eutectic Solvents ◽  
Elephant Grass ◽  
Film Forming ◽  
New Strategy

A new strategy was developed to produce cellulose nanofibrils and films from elephant grass using deep eutectic solvents and a recyclable solid acid catalyst with assistance of ultrasonic disintegration and a suction filtration film forming method.

scholarly journals ZnAlMCM-41; a very ecofriendly and reusable solid acid catalyst for highly selective synthesis of 1, 3-dioxanes by Prins cyclization of olefins

2021 ◽  
Author(s):  
Manickam Selvaraj ◽  
Mohammed A. Assiri ◽  
Hari Singh ◽  
Jimmy Nelson Appaturi ◽  
Subrahmanyam Ch ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Selective Synthesis ◽  
Comparison Study ◽  
Catalytic Method ◽  
Prins Cyclization ◽  
Heterogeneous Catalytic

Prins cyclization of styrene (SE) with paraformaldehyde (PFCHO) was conducted with mesoporous ZnAlMCM-41 catalysts for synthesis of 4-phenyl-1,3-dioxane (4-PDO) under a liquid phase heterogeneous catalytic method. For comparison study, the...

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