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Qin Lusha,Sungho Lee,Oi Lun Li 한국표면공학회 2020 한국표면공학회지 Vol.53 No.3
Herein, sulfonated carbon nanotubes (CNT) have been prepared in dilute sulfuric acid (H₂SO₄) via a novel sulfonation approach based on gas-liquid interfacial plasma (GLIP) at room temperature. The sulfonic acid groups and total acid groups densities of CNT after GLIP treatment in 2 M H₂SO₄ for 45 min can reach to 0.53 mmol/g and 3.64 mmol/g, which is higher than that of sulfonated CNT prepared under 0.5 M / 1 M H₂SO₄. The plasma sulfonated CNT has been applied as catalysts for the conversion of microcrystalline cellulose to glucose. The effect of hydrolysis temperature and hydrolysis time on the conversion rate and product distribution have been discussed. It demonstrates that the total conversion rate of cellulose increasing with hydrolysis temperature and hydrolysis time. Furthermore, the GLIP sulfonated CNT prepared in 2 M H₂SO₄ for 45 min has shown high catalytic stability of 85.73 % after three cycle use.
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이성호(Sungho Lee),친루사(Qin Lusha),리오이룬(Oi Lun Li) 한국세라믹학회 2020 세라미스트 Vol.23 No.4
Recently, the need for next-generation energy sources to replace fossil energy is increasing rapidly due to various problems such as depletion of oil and generation of carbon dioxide. One alternative to this is coffee grounds, one of the substances being studied. Coffee is consumed a lot around the world, but the disposal of the grounds is a big problem. However, this coffee grounds can be used as a raw material for biodiesel because it is made of various organic compounds such as cellulose and hemicellulose. The most common process to make biodiesel is the process using concentrated sulfuric acid as homogeneous catalysts to break down coffee into monosaccharides. However, the corrosive nature and disposal problem create environmental concerns in this process. Recently, heterogeneous silica acid catalyst, attracts many attention due to its environmental friendly nature, low cost and recyclability. In this experiment, instead of the sol-gel method for preparing a conventional silica acid catalyst, we prepared silica acid catalyst using a plasma method that can improve the catalytic performance. In the case of using the plasma method, the specific surface area increased and the catalyst performance increased, which led to an increase in xylose conversion and selectivity of 6% and 4%, respectively.