scholarly journals On the Effectiveness of Zeolite-Based Catalysts in the CO2 Recycling to DME: State of the Art and Perspectives

2017 ◽  
Author(s):  
Enrico Catizzone ◽  
Giuseppe Bonura ◽  
Massimo Migliori ◽  
Francesco Frusteri ◽  
Girolamo Giordano
Keyword(s):  
Industrial Development ◽  
Heterogeneous Catalysts ◽  
Environmental Issues ◽  
Oxide Phase ◽  
One Pot ◽  
Catalytic Systems ◽  
Warming Climate ◽  
New Concepts ◽  
Co2 Recycling ◽  
The One

Starting from the environmental issues related to global warming, climate change and reduction of greenhouse gas emissions, this review paper describes how CO2 recycling can represent a challenging strategy suitable to explore new concepts and opportunities for catalytic and industrial development. In this view, the production of dimethyl ether (DME) from catalytic hydrogenation of CO2 appears as a viable technology, able to meet also the ever-increasing need for alternative environmentally-friendly fuels and energy carriers. Basic considerations on thermodynamic aspects controlling DME production from CO2 are presented, then summarizing the main catalytic systems developed in such a field. Special attention is paid on the role assumed during last years by zeolite-based systems, either in the methanol-to-DME dehydration step or in the one-pot CO2-to-DME hydrogenation. On the whole, the productivity of DME results significantly to be dependent on several catalyst features, linked not only to the metal-oxide phase responsible for CO2 activation/hydrogenation, but also to specific properties of the zeolites (i.e., topology, porosity, surface area, acidity, interaction with active metals, distributions of metal particles, …) influencing activity and stability of hybridized bifunctional heterogeneous catalysts.

scholarly journals Facile Synthesis of COF-Supported Reduced Pd-Based Catalyst for One-Pot Reductive Amination of Aldehydes

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 287
Author(s):  
Jianguo Liu ◽  
Mingyue Zhang ◽  
Longlong Ma
Keyword(s):  
Heterogeneous Catalysts ◽  
Reductive Amination ◽  
Secondary Amines ◽  
Metallic State ◽  
One Pot ◽  
Effective Synthesis ◽  
Pharmaceutical Industries ◽  
The One ◽  
Heterocyclic Aldehydes ◽  
Supported Pd

Dibenzylamine motifs are an important class of crucial organic compounds and are widely used in fine chemical and pharmaceutical industries. The development of the efficient, economical, and environmentally friendly synthesis of amines using transition metal-based heterogeneous catalysts remains both desirable and challenging. Herein, we prepared the covalent organic framework (COF)-supported heterogeneous reduced COF-supported Pd-based catalyst and used it for the one-pot reductive amination of aldehydes. There are both Pd metallic state and oxidated Pdσ+ in the catalysts. Furthermore, in the presence of the reduced COF-supported Pd-based catalyst, many aromatic, aliphatic, and heterocyclic aldehydes with various functional groups substituted were converted to their corresponding amines products in good to excellent selectivity (up to 91%) under mild reaction conditions (70 °C, 2 h, NH3, 20 bar H2). This work expands the covalent organic frameworks for the material family and its support catalyst, opening up new catalytic applications in the economical, practical, and effective synthesis of secondary amines.

Merging gold catalysis, organocatalytic oxidation, and Lewis acid catalysis for chemodivergent synthesis of functionalized oxazoles from N-propargylamides

2017 ◽  
Vol 53 (75) ◽  
pp. 10366-10369 ◽  
Author(s):  
Shaoyu Mai ◽  
Changqing Rao ◽  
Ming Chen ◽  
Jihu Su ◽  
Jiangfeng Du ◽  
...  
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Acid Catalysis ◽  
Gold Catalysis ◽  
One Pot ◽  
Catalytic Systems ◽  
One Pot Synthesis ◽  
The One ◽  
Cationic Gold

Novel catalytic systems consisting of cationic gold complexes, N-hydroxyphthalimide (NHPI), and transition-metal-based Lewis acids have been developed for the one-pot synthesis of functionalized oxazoles.

Alginate–copper microspheres as efficient and reusable heterogeneous catalysts for the one-pot synthesis of 4-organylselanyl-1H-pyrazoles

2020 ◽  
Vol 10 (12) ◽  
pp. 3918-3930 ◽  
Author(s):  
Jaqueline F. Souza ◽  
Thalita F. B. de Aquino ◽  
José E. R. Nascimento ◽  
Raquel G. Jacob ◽  
André R. Fajardo
Keyword(s):  
Heterogeneous Catalysts ◽  
One Pot ◽  
New Class ◽  
One Pot Synthesis ◽  
Facile Preparation ◽  
The One ◽  
Substituted Pyrazoles

This study demonstrates the facile preparation and use of alginate–Cu2+ microspheres in the catalysis of a new class of organoselenium substituted pyrazoles through one-pot reactions.

Cu(0) onto sulfonic acid functionalized silica/carbon composites as bifunctional heterogeneous catalysts for the synthesis of polysubstituted pyridines and nitriles under benign reaction media

RSC Advances ◽  
2016 ◽  
Vol 6 (101) ◽  
pp. 99604-99614 ◽  
Author(s):  
Madhvi Bhardwaj ◽  
Manmeet Kour ◽  
Satya Paul
Keyword(s):  
Sulfonic Acid ◽  
Heterogeneous Catalysts ◽  
Carbon Composites ◽  
Functionalized Silica ◽  
One Pot ◽  
Oxidative Transformation ◽  
One Pot Synthesis ◽  
The One ◽  
Reaction Media

Bifunctional heterogeneous catalysts based on Cu(0) onto sulphonated silica/carbon composites for the one-pot synthesis of polysubstituted pyridines and oxidative transformation of aldehydes to nitriles.

ChemInform Abstract: Heterogeneous Catalysts for the One-Pot Synthesis of Chemicals and Fine Chemicals

ChemInform ◽  
2011 ◽  
Vol 42 (20) ◽  
pp. no-no ◽  
Author(s):  
Maria J. Climent ◽  
Avelino Corma ◽  
Sara Iborra
Keyword(s):  
Heterogeneous Catalysts ◽  
Fine Chemicals ◽  
One Pot ◽  
One Pot Synthesis ◽  
The One

scholarly journals Theological approach to environmental issue

Napredak ◽  
2020 ◽  
Vol 1 (3) ◽  
pp. 115-130
Author(s):  
Tomislav Lunić ◽  
Jelena Ćesarević
Keyword(s):  
Natural Resources ◽  
Growth And Development ◽  
Industrial Development ◽  
Environmental Issues ◽  
Environmental Issue ◽  
Green Economy ◽  
Ecological Awareness ◽  
Technological Growth ◽  
The One ◽  
Detrimental Impact

The environmental question is a multidimensional problem caused by the detrimental impact that human activity is having on the environment. Religious scholars, theologians, as well as numerous members of religious elites, in essence, view the issue as an anthropological phenomenon. In the first part of the study, we highlight several consequences of accelerated industrial development, technological growth and development: water, air and soil pollution; the shortage of natural resources due to uncontrolled exploitation; the degradation of biodiversity; climate change, etc. Additionally, in the study we focus is on man who, on the one hand, raises ecological awareness, by establishing different programs, organizations and various action plans, while on the other, through raw exploitation and the using up of natural resources, contributes to the ongoing imbalance in the ecosystem, and in essence, God's creation as a whole. The blame lies with man, and not nature. The destruction starts with the Biblical Fall and continues to this very day. In this regard, there are different solutions for switching to healthy technologies and a green economy. Institutions and organizations that deal with environmental issues are being established. Nonetheless, only the symptoms are treated, and not what is in fact the root of the problem. Thus, the theological solution is based on establishing harmony between God, man and the environment, which in the liturgical sense of the cosmos can stop the destruction of the environment, i.e., the environment as a whole. Therefore, the environment is entrusted to man as God's gift to save and cherish in a Eucharistic, liturgical, priestly manner.

scholarly journals Recent Progresses in the Multicomponent Synthesis of Dihydropyridines by Applying Sustainable Catalysts Under Green Conditions

2021 ◽  
Vol 9 ◽  
Author(s):  
Immandhi Sai Sonali Anantha ◽  
Nagaraju Kerru ◽  
Suresh Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Heterogeneous Catalysts ◽  
Reaction Times ◽  
Cost Effective ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Significant Efficacy ◽  
Magnetic Silica ◽  
Active Methylene

The synthesis of dihydropyridines, valuable molecules with diverse therapeutic properties, using eco-friendly heterogeneous catalysts as a green alternative received significant consideration. By selecting appropriate precursors, these compounds can be readily modified to induce the desired properties in the target product. This review focused on synthesising diverse dihydropyridine derivatives in single-pot reactions using magnetic, silica, and zirconium-based heterogeneous catalytic systems. The monograph describes preparation techniques for various catalyst materials in detail. It covers facile and benign magnetic, silica, zirconium-based, and ionic liquid catalysts, exhibiting significant efficacy and consistently facilitating excellent yields in short reaction times and in a cost-effective way. Most of the designated protocols employ Hantzsch reactions involving substituted aldehydes, active methylene compounds, and ammonium acetate. These reactions presumably follow Knoevenagel condensation followed by Michael addition and intra-molecular cyclisation. The multicomponent one-pot protocols using green catalysts and solvents have admirably increased the product selectivity and yields while minimising the reaction time. These sustainable catalyst materials retain their viability for several cycles reducing the expenditure are eco-friendly.

ChemInform Abstract: Nano Copper and Cobalt Ferrites as Heterogeneous Catalysts for the One-Pot Synthesis of 2,4,5-Tri Substituted Imidazoles.

ChemInform ◽  
2015 ◽  
Vol 46 (22) ◽  
pp. no-no
Author(s):  
Paul Douglas Sanasi ◽  
D. Santhipriya ◽  
Y. Ramesh ◽  
M. Ravi Kumar ◽  
B. Swathi ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
One Pot ◽  
One Pot Synthesis ◽  
Cobalt Ferrites ◽  
The One

Three-component condensation reaction of various aldehydes, dimedone and malononitrile catalyzed by boric acid in water in comparison with multifunctional ionic liquids as green catalytic systems

2018 ◽  
Vol 73 (10) ◽  
pp. 707-712
Author(s):  
Ardeshir Khazaei ◽  
Heidar Ali Alavi Nik ◽  
Ahmad Reza Moosavi-Zare ◽  
Hadis Afshar-Hezarkhani
Keyword(s):  
Ionic Liquids ◽  
Boric Acid ◽  
Ammonium Acetate ◽  
Condensation Reaction ◽  
One Pot ◽  
Water Separation ◽  
Catalytic Systems ◽  
Hydronium Ion ◽  
Solvent Free Conditions ◽  
The One

AbstractTriethanol ammonium acetate ([TEAH]+[OAc]−) and triethanol ammonium formate ([TEAH]+[HCOO]−) as multifunctional ionic liquids and catalysts were successfully applied for the preparation of tetrahydrobenzo[b]pyrans by the one-pot three-component condensation reaction of various aldehydes, dimedone and malononitrile under solvent-free conditions. These reactions were also tested using boric acid in water. In this catalytic system, by the reaction of water with boric acid, the hydronium ion caused by water separation can catalyze the reaction.

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