Article
Chemistry, Physical
Nino Rinaldi, Nova Dwi Enjelina Purba, Anis Kristiani, Egi Agustian, Robert Ronal Widjaya, Adid Adep Dwiatmoko
Summary: This study explores the effect of sonication on the pillarization process of bentonite. It is found that using sonication can significantly reduce the pillarization time and enhance the porosity and acidity of the prepared solid acid catalyst. As a result, the conversion of the esterification reaction is improved.
CATALYSIS COMMUNICATIONS
(2023)
Article
Energy & Fuels
Faegheh Kiani, Golshan Mazloom, Milad Ghani, Farhad Banisharif
Summary: This study utilized HCl and H3PO4-modified bentonite to convert glucose to furfural in a water-dimethyl sulfoxide system. The effects of catalyst acidity on the selective formation of furfural were investigated. Results showed that H3PO4-modified bentonite had a lower strong acid density and a suitable number of weak acid sites, which facilitated the catalytic conversion reaction.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Physical
Beata Grabowska, Sylwia Cukrowicz, Karolina Kaczmarska, Sylwia Zymankowska-Kumon, Artur Bobrowski, Bozena Tyliszczak, Natalia Maria Mrowka
Summary: A new type of organobentonite foundry binder composed of a composite of bentonite and poly(acrylic acid) was found to be thermally stable and environmentally friendly.
Article
Chemistry, Physical
Magdalena Saramok, Agnieszka Szymaszek, Marek Inger, Katarzyna Antoniak-Jurak, Bogdan Samojeden, Monika Motak
Summary: Natural heulandite-type zeolite modified with iron was tested as a catalyst for NH3-SCR. The shaped catalyst showed good catalytic performance at 450 degrees C, exhibiting activity in both DeNO(x) and DeN(2)O processes.
Article
Chemistry, Multidisciplinary
Farzaneh Mohamadpour
Summary: Based on the Biginelli reaction, a green synthesis procedure was developed for 3,4-dihydropyrimidin-2-(1H)-ones/thiones using beta-ketoesters, arylaldehydes, and urea/thiourea. A PCET photocatalyst in an ethanol solution was utilized at room temperature and under visible light, offering a renewable energy source. The carbazole-based photocatalyst (4CzIPN) demonstrated high yields, energy-efficiency, and ecological friendliness, making it a cost-effective and readily available donor-acceptor fluorophore. The study also showed the potential industrial application of the procedure through gram-scale cyclization.
Article
Engineering, Environmental
Karna Wijaya, Muhammad Ahan Kurniawan, Wahyu Dita Saputri, Wega Trisunaryanti, Mohammad Mirzan, Poedji Loekitowati Hariani, Alfrets Daniel Tikoalu
Summary: Ni-BZS catalyst was synthesized and optimized for hydrocracking process, showing high activity and selectivity, especially Ni-BZS 0.5 catalyst which can convert coconut oil into bio-gasoline efficiently. Further studies on the role of Ni metal and optimization of catalyst composition are needed for future research.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Ruru Zhou, Yuanyuan Jiang, Huaiyuan Zhao, Boyong Ye, Lina Wang, Zhaoyin Hou
Summary: A stable solid acid catalyst, PSF/K-SiO2, was synthesized and demonstrated to be highly active and stable in the acetalization of glycerol at room temperature, achieving a high solketal yield with good recyclability.
Article
Chemistry, Multidisciplinary
Magar Subhash, Dan Bahadur Pal, Sumit Kumar Jana
Summary: The study reveals that in the etherification reaction of glycerol with t-Butanol, the complete conversion of glycerol is achieved and the selectivity of di- and tri-glycerol ethers is highest at 26% using 40% DTP/BNT catalysts.
Article
Chemistry, Physical
Sylwia Cukrowicz, Maciej Sitarz, Kamil Kornaus, Karolina Kaczmarska, Artur Bobrowski, Agnieszka Gubernat, Beata Grabowska
Summary: The study successfully prepared SN/PAA and SN-Na/PAA composites with the potential to be new foundry binders. The results show that poly(acrylic acid) can act as a binding agent in synthetic molding sand technology, reducing the risk of mineral materials losing their binding capacity.
Article
Materials Science, Multidisciplinary
Qiang Shen, Songyuan Mao, Yubin Zhou, Yuheng Xie, Peisong Tang
Summary: Fe3+ and Fe2+ modified bentonites were prepared by ion exchange and reduction methods, and their adsorption capacity for tetracycline and catalytic activity as heterogenous Fenton catalyst were investigated. Both Fe3+-bentonite and Fe2+-bentonite showed excellent removal performance for tetracycline, and maintained certain removal ability under Fenton conditions.
Article
Energy & Fuels
Mina Mortazavipanah, Maryam Homayoonfal, Fatemeh Davar
Summary: In this study, a photo-catalytic membrane reactor was used to remove humic acid from wastewater. By depositing single-component catalysts and a composite catalyst (ZnSe/CdSe) on a polysulfone membrane, ZniCdjM1 membranes were synthesized. The results showed that the composite catalyst had a more effective role in adjusting the membrane pore size and achieving higher humic acid separation. The composite catalyst also exhibited better photocatalytic reactions compared to the single-component catalysts, resulting in higher degradation of humic acid under UV radiation.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Engineering, Environmental
Gihoon Kwon, Dong-Wan Cho, Eilhann E. Kwon, Jorg Rinklebe, Hailong Wang, Hocheol Song
Summary: In this study, Fe-impregnated bentonite was used as a catalyst in the pyrolysis of grass cut to improve the production of syngas, the quality of bio-oil, and the sorptive property of biochar. The addition of Fe-impregnated bentonite significantly increased the production of H2 and CO, resulting in more homogeneous chemical species and higher sorption capacity in the produced bio-oil and biochar, respectively.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Yuewen Dai, Maofu Geng, Yuhong Tao, Zhenyu Zhang, Chengqi Feng, Juncheng Huang, Fei Liu, Haining Na, Jin Zhu
Summary: By using a phosphate-modified hydroxyl-rich carbon-based catalyst (P@HRCBC) made through hydrothermal carbonization, glucose is successfully hydrolyzed from cellulose. The enhanced adsorption capacity of P@HRCBC with rich -OH enhances the glycosidic bond breaking catalyzed by -PO3H2 and cellulose matrix lamellar exfoliation. The cellulase activity is perfectly imitated and glucose output and cellulose conversion rate reach 96.3% and 47.1% respectively within 120 minutes. The various ways of cellulose and cellobiose adsorption by P@HRCBC alter its catalytic ability and facilitate glucose separation. After multiple cycles, the cellulose conversion rate remains above 90.3% due to the remarkable stability of -OH and -PO3H2. P@HRCBC exhibits actual enzymatic catalytic function, providing a new solution for efficient green cellulose hydrolysis into glucose.
Article
Chemistry, Applied
Mohamed Mokhtar, Tamer S. Saleh, Katabathini Narasimharao, Ebtesam Al-Mutairi
Summary: The present study focuses on the synthesis of novel Hantzsch 1,4-dihydropyridines containing diphenylsulfone moiety using modified heteropoly acid catalysts under ultrasound irradiation. The developed protocol provides a simple, efficient, and green approach for the synthesis of different 1,4-dihydropyridine derivatives. The characterized HPA supported iron phosphate nanotubes catalysts show enhanced catalytic performance and can be utilized multiple times without significant loss of activity.
Article
Chemistry, Physical
Raihamol Erattammottil Thampikannu, Alejandro Jimenez, Vicente Rives, Miguel Angel Vicente, Bismi Razak, Kannan Vellayan
Summary: This study reports the preparation and application of hydrofluoric acid-modified saponite catalysts for the selective synthesis of 4-hydroxyacetophenone through acylation reaction. The method is solvent-free and scalable for the preparation of para-isomer product. The prepared 4-hydroxyacetophenone was characterized using various spectroscopic techniques. The catalysts showed excellent yields with milder conditions and low amounts of acid-treated catalysts, outperforming other catalysts for this reaction. The catalysts were environmentally friendly, cost-effective, and recyclable over three cycles without significant loss in activity. The study presents a new strategy for the use of clay minerals as catalysts in Fine Chemistry reactions.
APPLIED CLAY SCIENCE
(2022)
