Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Pretreatment of wheat straw for the production of fermentable sugars with a recyclable low-concentration p-toluenesulfonic acid
No full textAcid hydrotrope pretreatment has attracted widespread attention due to its efficient separation of lignocellulose. However, current acid hydrotrope pretreatment needs a large quantity of hydrotrope, and its recovery requires high energy consumption. In this study, wheat straw was pretreated using low-concentration p-toluenesulfonic acid (p-TsOH) to maximize the production of fermentable sugars. p-TsOH from the hydrolysate was recovered by hyper-cross-linked resin. The results showed that under the optimal pretreatment conditions (1 % p-TsOH, reaction temperature at140 degrees C and reaction time at 1.5 h), the xylose yield was 85.66 %, and the cellulose conversion from enzymatic hydrolysis of pretreated wheat straw was 94.65 %. Furthermore, the recovery rate of pTsOH was 98.23 %. It is noteworthy that the hydrolysate can be used for microbial fermentation without detoxification, and the fermentation efficiency is comparable to synthetic medium. All in all, this study provides a reliable, low-cost, and recyclable pretreatment technology for the efficient utilization of lignocellulose
Excellent efficiency and cycling performance for organic pollutant degradation using Sb<sub>2</sub>S<sub>3</sub> tubular photocatalysts with heterojunction structures
No full textAntimony sulfide (Sb2S3) is a common and practical metal sulfide, and photocatalysis with metal sulfide is a viable solution for addressing significant water pollution issues. Simple chemical vapor deposition (CVD) method was used to successfully produce Sb2S3 tubes for photocatalysis in this research. XRD, EDS, SEM, TEM, HRTEM, SAED, XPS and UV-Vis were used to examine the crystal structure, composition, morphology, and optical properties of the products. The photocatalytic activity of the Sb2S3 tubes was tested using a xenon lamp to simulate sunshine, methyl orange (MO) as a target degradation substance, and tetracycline hydrochloride (HTC) as a degradation substance. The results reveal that under xenon lamp illumination, the constructed Sb2S3 tubes has an excellent photocatalytic degradation rate for MO. The photocatalytic degradation rate of MO reaches 98.4% after 4 h, indicating good cycle performance, after five cycles, the degradation rate is 86.4%. During photocatalytic degradation, Sb2S3 was corroded and antimony oxide (Sb2O3) was formed. Sb2O3 on antimony Sb2S3 forms a Sb2S3/Sb2O3 heterojunction, which speeds up the reaction rate and improves cycling stability
Guangdong Key Construction Discipline Research Capacity Enhance-ment Project[2022ZDJS047]
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Switchable reductive amination of aldehydes over metal-encapsulated S-1 zeolites with tunable acid-base properties
No full textCatalytic reductive amination of aldehydes is a valuable strategy to synthesize nitrogen-containing compounds but often suffers from low selectivity and complex reaction mechanisms. This study aims to develop a selective control method for the syntheses of primary amines and secondary imines, which are widely used in fine and bulk chemicals, materials, and pharmaceuticals. Metal-encapsulated zeolite is a special type of catalyst that combines the advantages of metal nanoparticles and zeolites, such as high activity and selectivity. Herein, metal- encapsulated zeolites (Pd-M@S-1, M=Ni, =Ni, Mn, Co) were applied as catalysts for the reductive amination of aromatic aldehydes. Results showed that the reductive amination of aldehydes over Pd-M@S-1 catalysts can be selectively switched between primary amines over Pd0.6@S-1 and secondary imines over Pd0.6Ni@S-1 by tuning the acid-base properties of the catalysts. The effect of acid-base properties of catalysts on selectivity control was claimed by conducting control experiments, time-dependent curves, and detailed characterizations
Ozonolysis with MnO<sub>2</sub>: A Safe and Cost-Efficient Way for Producing Aldehydes and Ketones
No full textOzonolysis is a highly promising reaction for biomass valorization due to high efficiency, value-added carbonyl products, cheap oxidant, and mild conditions. However, the generation and accumulation of explosive peroxides during ozonolysis can be a risk and obstacle for large application. Herein, we propose a simple method that treats ozonolysis products with MnO2 to decompose and reduce the complex peroxides. Here, 60-90% peroxides can be removed within minutes at ambient conditions. Solvent and substrate structures influence MnO2 activity. We further propose a novel in situ MnO2-assisted ozonolysis, which restrains formation of peroxides while promotes aldehydes formation. Kinetic investigations indicated that H2O2 decomposition at low concentration is a first-order reaction, while it accelerated at high concentration due to an involvement of second-order decomposition of an organic peroxide generated in a rapid equilibrium with H2O2 and aldehyde. This work suggests that ozonolysis enables greener biomass valorization with more sustainable carbonyl products
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