Article
Engineering, Environmental
Chenghao Zhang, Jing Luo, Binqi Xie, Wei Liu, Jisong Zhang
Summary: A continuous micro-packed bed reactor platform is developed to determine the kinetics of aerobic ethylbenzene oxidation in the presence of N-hydroxyphthalimide. The reactor system offers enhanced gas-liquid mass transfer, leading to a significant increase in the space-time yield of ethylbenzene oxidation compared to traditional batch reactors. Furthermore, the organic catalyst NHPI is covalently anchored on commercial activated carbon through an imidization reaction. The synthesized heterogeneous catalysts exhibit excellent performance in terms of acetophenone yield and turnover frequency (TOF).
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Muhammad Nadeem Amin, Ashfaq Ahmed, Yi Li, Chunshan Li, Suojiang Zhang, Muhammad Ammar, Young-Kwon Park
Summary: The catalytic effect of Mg/HZSM-5 in fast pyrolysis of low-rank coal and coal tar conversion was found to reduce total tar yield, increase the yield of light tar, and decrease the content of elements N and S in the resulting coal tars.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Antonin Delaune, Sergui Mansour, Baptiste Picard, Philippe Carrasqueira, Isabelle Chataigner, Ludovic Jean, Pierre-Yves Renard, Jean-Christophe M. Monbaliu, Julien Legros
Summary: The oxidative neutralisation of sulfur-containing CWAs with Oxone in flow systems has been developed, and in order to achieve full selectivity towards harmless decomposition products, Oxone must be used in either solid or aqueous form.
Article
Engineering, Chemical
Linyang Wang, Qiang Wang, Yongqi Liu, Qiuxiang Yao, Ming Sun, Xiaoxun Ma
Summary: HZSM-5 zeolites with different Si/Al ratios were studied for their catalytic performance in the conversion of asphaltenes pyrolysis production to BTXN. The results showed that HZSM-5 with Si/Al ratio of 50 exhibited the highest relative content of aromatics. The addition of different metal ions (Ni2+, Mo6+, Fe3+, and Co2+) led to an increase in acid strength and the formation of new active sites on the Z5-50 zeolites. The study also revealed that the active sites provided by different metal species had diverse effects on the production of BTXN.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Alain Moissette, Isabelle Batonneau-Gener, Matthieu Hureau, Ludovic Pinard, Herve Vezin, Michel Perdicakis, Alain Walcarius
Summary: This study reports the electron transfers after ionization of t-stilbene guest molecules in graphitized HZSM-5 zeolites, with evidence of long-lived charge separated states observed through UV-vis and Raman spectroscopies. Strong coupling between unpaired electrons and C-13 atoms is found in graphitized zeolites, indicating the presence of charge transfer complexes near graphite areas. This study also demonstrates an electrochemical response in such systems for the first time, highlighting the role of graphite in electron transfers.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Engineering, Environmental
Ion Iliuta, Hannaneh Rasouli, Maria C. Iliuta
Summary: This study proposes an intensified CO2 capture method using an immobilized enzyme in a packed-bed microreactor. Experimental and theoretical analysis shows that the microreactor enhances mass transfer and improves CO2 conversion. Low enzyme loadings and specific buffer conditions favor CO2 capture. The performance of the microreactor surpasses that of traditional fixed-bed reactors and is suitable for green CO2 capture in various sectors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Carolina de Araujo Gusmao, Laura Teixeira Borges, Priscila Hasse Palharim, Larissa Otubo, Orlando Rodrigues, Douglas Gouvea, Bruno Ramos, Antonio Carlos Silva Costa Teixeira
Summary: This study conducted a thorough investigation of the optimal platinum content in TiO2/SiO2 materials, developed a highly effective catalyst for acetaminophen degradation, and proposed a photocatalytic mechanism.
Article
Environmental Sciences
Parisa Ghofrani-Isfahani, Panagiotis Tsapekos, Maria Peprah, Panagiotis Kougias, Athanasios Zervas, Xinyu Zhu, Ziyi Yang, Carsten S. Jacobsen, Irini Angelidaki
Summary: In this study, two thermophilic trickle bed reactors (TBRs) packed with different packing densities were evaluated for their performance in ex-situ biogas upgrading process. The results showed that densely packed polyurethane foam (PUF) enhanced H-2 utilization efficiency and methane content in the output gas. High-rate nutrient trickling, however, had negative effects on biomethanation efficiency.
Article
Chemistry, Multidisciplinary
Zipin Peng, Xuepeng Wang, Zheng Li, Xingkun Chen, Yunjie Ding, Jisong Zhang
Summary: In this work, Pd catalysts supported on activated carbon (Pd/AC) were synthesized and a continuous flow system based on a micro-packed bed reactor was developed for the hydrodechlorination of chlorobenzene. The Pd/AC catalyst showed excellent performance with 100% conversion and selectivity, and no obvious catalyst deactivation was observed during the stability test.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Environmental Sciences
Kitirote Wantala, Warangkana Klangwichian, Totsaporn Suwannaruang, Siriwan Praphatsaraphiwat, Rangsima Taksungnern, Prae Chirawatkul, Sommas Kaewluan, Harikaranahalli Puttaiah Shivaraju
Summary: This study focuses on the upgrading of pyrolytic oil derived from fresh palm fruit using the catalytic in situ hydrodeoxygenation (in situ HDO) process. Nickel-doped HZSM-5 zeolite (Ni-HZSM-5) was prepared and shown to enhance the catalytic potential. The in situ HDO process successfully reduced the oxygen content and cracked the pyrolytic oil into smaller molecules, resulting in an upgraded oil that meets the specifications of kerosene and diesel fuels.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
John Eleeza, Sundaramurthy Vedachalam, Philip Boahene, Ajay K. Dalai, John Adjaye
Summary: The study found that LHSV is the key factor affecting fines deposition, with higher LHSV resulting in decreased deposition. Pressure and temperature show interactive effects, with specific combinations minimizing deposition. The opposite surface charges of fines and the catalyst create an attractive force leading to fines deposition.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Materials Science, Ceramics
Sawao Honda, Yuma Matsuda, Kento Nakashima, Yusuke Daiko, Shinobu Hashimoto, Yuji Iwamoto
Summary: The local structure of the dry gel before synthesis was evaluated using in situ Raman spectroscopy, and the conformational change of TEA(+) cations and the transformation of silicate building units were observed during the drying process, providing insights into the faster crystallization of zeolite beta.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Hong Zhang, Minjing Shang, Yuchao Zhao, Yuanhai Su
Summary: The stable water-in-oil Pickering emulsion, fabricated using SO3H-functionalized ionic liquid and surface-modified silica nanoparticles, demonstrated high reaction activity and product selectivity in the synthesis of 2,2'-(4-nitrophenyl) dipyrromethane in a packed-bed microreactor. Compared to liquid-liquid slug-flow microreactors and batch reactors, the Pickering-emulsion-based catalytic system showed higher specific interfacial area, resulting in a higher yield (90%) of the targeted product. This study highlighted the potential of Pickering-emulsion-based packed-bed microreactors utilizing ionic liquids for intensification of organic synthesis through enhanced contact between reactants and catalytic aqueous solutions.
Article
Green & Sustainable Science & Technology
Nichaboon Chaihad, Yohanes Andre Situmorang, Aisikaer Anniwaer, Irwan Kurnia, Surachai Karnjanakom, Yutaka Kasai, Abuliti Abudula, Prasert Reubroycharoen, Guoqing Guan
Summary: Hierarchical HZSM-5 zeolites prepared by desilication with TPAOH-assisted NaOH exhibited enhanced catalytic performance in the upgrading of bio-oil derived from fast pyrolysis of sunflower stalk, with the best performance achieved through metal modification. Specifically, 0.25 wt% Cu loaded hierarchical HZSM-5 showed increased aromatic hydrocarbons yield with reduced coke formation.
Article
Chemistry, Physical
Xinde Sun, Yue Yang, Yanli He, Shukui Zhu, Zhongmin Liu
Summary: By optimizing Si/Al ratio and hydrothermal treatment temperature, a high performance HZSM-5 catalyst was developed for liquid phase dehydration of methanol to dimethyl ether (DME). During a long term test of 6788 hours, DME selectivity remained above 99.96% with only slight deactivation observed, primarily attributed to coking and decline of HZSM-5 crystallinity.