Two major breakthroughs were achieved using the "acid hydrolysis" synthesis routeTwo major breakthroughs were achieved using the "acid hydrolysis" synthesis route
cn record of volumetric adsorption of carbon dioxide, excellent separation ability, unaffected by water vapor, low cost, self-forming, and more environmentally friendly························································································································································································································································Nanjing University of Technology The self-forming iron-containing mordenite adsorbent composed of the professor's subject has made new breakthroughs in the field of carbon capture
On July 16, "Science" magazine published the full text online of this latest research result
Physical adsorbents such as zeolite have many advantages such as wide application range, low cost, simple operation, and convenient recycling of adsorbents, so they are favored in the field of carbon capture
"However, the existing zeolite adsorbents face challenges such as low adsorption capacity, low gas separation ratio, intolerance to water vapor, high energy consumption for desorption and regeneration, and performance degradation of the binder after molding
" Professor Zhou Yu from Nanjing University of Technology said
Experiments show that the iron-containing mordenite adsorbent synthesized by the team has an adsorption capacity of 219 cubic centimeters per cubic centimeter under normal temperature and pressure conditions, which is the highest value reported so far
Under the same conditions, the highest adsorption capacity of the industrial standard 13X zeolite adsorbent is 156 cubic centimeters/cubic centimeter
More importantly, the obtained material shows good screening ability for argon, nitrogen, methane, etc.
, and its separation is several orders of magnitude higher than that of 13X zeolite adsorbent
"Usually in the separation process, there is water vapor in the actual gas, and some adsorbents are unstable when exposed to water.
Most of the adsorbents are "hydrophilic", so the separation performance is severely interfered by water vapor.
It often needs to be dried and then adsorbed.
The separation performance of the zeolite adsorbent is not disturbed by water vapor and is excellent in recycling use
" Professor Zhou Yu said
In terms of energy consumption, when the current industrial standard 13X zeolite adsorbent separates carbon dioxide/methane (50/50) mixed gas, it takes 0.
97 megajoules of energy to recover 1 kg of carbon dioxide, while the iron-containing mordenite adsorbent absorbs 1 kg per kilogram.
Carbon dioxide only consumes 0.
7 megajoules of energy
Professor Wang Jun said: "Under the same purity, the recovery rate of carbon dioxide for the adsorbent developed by our team is greater than 95%, and the recovery rate of methane can be increased from 61.
9% to 96.
As early as 15 years ago, the members of the research team started the research of this kind of zeolite materials, and gradually formed a unique "acid hydrolysis" route synthesis method
The iron-containing mordenite adsorbent prepared by the team using this process has achieved two major breakthroughs: one is to change the original powder form into a block with high mechanical strength, which eliminates the need for subsequent molding processes and has typical green chemical characteristics; the other is the realization of a unique pore structure In order to achieve high-efficiency carbon capture
According to Zhou Yu, the diameter of carbon dioxide is 0.
33 nanometers, and the pore size of the iron-containing mordenite adsorbent is 0.
33 to 0.
As a result, this pore size becomes the "exclusive" capture hole for carbon dioxide
This research has practical application potential and opens up new applications of heteroatom zeolite molecular sieves in the field of gas adsorption and separation
The results of this research can be applied to post-combustion carbon dioxide capture, natural gas purification, and biogas purification in power plants