The plastic recycling and sequestration of carbon dioxide
Indian chemists in collaboration with British colleagues have created a nanoporous material, named as amorphous zeolite, which converts carbon dioxide into fuel and plastic from waste chemicals. The study is published in the journal Nature Communications.
Global warming, caused by greenhouse gas emissions, and pollution of non-biodegradable waste — the most important anthropogenic problems the solution of which I think scientists from different countries.
Chemists from the Indian Tata Institute of fundamental research in Mumbai under the guidance of Professor Vivek Pulsedriver (Vivek Polshettiwar), together with colleagues from Nottingham University in the UK has developed a substance belonging to the class of solid acids, which will help to deal with that, and with others.
Solid acids have the property of strong catalysts and can replace environmentally harmful liquid acid in some industrial processes, such as cracking of hydrocarbons, alkylation and decomposition of plastic waste and the conversion of carbon dioxide into fuel.
Most solid acids are organic compounds, but there are natural mineral substances. The most famous of them — the crystalline zeolites and amorphous aluminosilicates.
Zeolites are strong solid acids. They might give again to absorb water depending on the temperature and humidity accelerate chemical reactions, but also have the ability to ion exchange. However, too small a porosity of zeolites restricts their application in industrial processes based on diffusion. Amorphous aluminosilicates, on the contrary, have low acidity, but high porosity.
Researchers have set a goal to design and synthesize a substance with strong acidic properties of zeolites, and textural properties as the aluminosilicates.
Using drops of the microemulsion as a soft template, the researchers synthesized an acidic amorphous aluminosilicate (A) in the form of a porous nanocube, which they called "amorphous zeolite".
Thanks to the synergy between the strong acidity and permeability AAS showed better performance than modern zeolites and amorphous aluminosilicates in a number of real processes and catalytic reactions — the disclosure of the styrene oxide, the synthesis besedila, the alkylation the Friedel-crafts synthesis jasminelodge, isomerization of m-xylene and the cracking of cumene, which require strong acid sites and large pore sizes.
The presence of a new zeolite like material acid silanols centers, despite the fact that it is amorphous, not crystalline, confirmed by the results of its analysis by nuclear magnetic resonance.
The authors propose to consider the AAS as a representative of a new class of materials that are between crystalline zeolites and amorphous aluminosilicates.
The researchers believe that based on the amorphous zeolite is possible to create a technology tertogennogo of catalysis for the simultaneous decomposition of plastic waste and carbon dioxide gas to produce hydrocarbons as raw materials for chemical industry and fuel.