Article
Thermodynamics
Jiazhou Li, Xiaodong Chen, Yuming Zhang, Jinghui Xu, Yindong Liu, Luhai Wang, Wei Zhang, Jinjun Guo, Wenbin Zhang, Qiang Sun, Yunfei Qi
Summary: The fluidized thermal conversion technique can enrich aromatics in slurry oil and remove solid particles. The use of modified cokes as heat carriers reduces oil yield and increases coke yield, as well as increases the yield of gas product H-2.
Article
Energy & Fuels
Melisa Panero, Richard Pujro, Marisa Falco, Ulises Sedran, Javier Bilbao, Jose M. Arandes
Summary: The effect of co-feeding bio-oil and vacuum gas oil (VGO) on the energy balance of a FCC unit was studied. It was found that the heat from coke combustion is insufficient when the proportion of bio-oil in the feedstock exceeds 5%, mainly due to the high water content in the aqueous fraction of the bio-oil and the lower heat of combustion of the coke formed in co-processing compared to VGO alone.
Article
Energy & Fuels
Thabang W. Selalame, Raj Patel, Iqbal M. Mujtaba, Yakubu M. John
Summary: This paper explores the importance of accurate and reliable models in predicting greenhouse gas emissions from Fluid Catalytic Cracking (FCC) regenerators. The FCC unit is a significant contributor to global emissions, and recent efforts in climate change mitigation have highlighted the need for improved models to optimize operations and reduce costs. The paper reviews traditional modeling methodologies and discusses the hydrodynamics, kinetics, and constitutive parts of the regenerator. It concludes with suggestions for improving current models and providing a framework for future research.
Article
Chemistry, Applied
Jun Bao, Qing-he Yang, Shuang-qin Zeng, Xiao-yi Sang, Wei-ming Zhai, Hong Nie
Summary: High-performance amorphous silica-alumina (ASA) with enhanced specific surface area and acidity was successfully synthesized using the pH-swing method. The morphology and structure of ASA were investigated, and it was found that the morphology and specific surface area of ASA were influenced by the SiO2 content. The increase of surface silanol groups facilitated the formation of Brunsted acid sites (BAS). Furthermore, the activity of ASA was proportional to the concentration of BAS.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Energy & Fuels
T. S. Romanova, K. A. Nadeina, I. G. Danilova, V. V. Danilevich, V. P. Pakharukova, A. A. Gabrienko, T. S. Glazneva, E. Yu. Gerasimov, I. P. Prosvirin, Yu. V. Vatutina, M. O. Kazakov, O. V. Klimov, A. S. Noskov
Summary: The effect of Si incorporation at the stage of alumina preparation on the physico-chemical properties and catalytic performance of NiMo/Al2O3 catalysts for FCC feedstock pretreatment was studied. Silicon addition changed the texture characteristics of the support and reduced the acidity of alumina. Incorporation of Si facilitated the segregation of Ni from the NiMoS phase. Addition of Si through kneading improved the hydrodesulfurization activity of the catalysts in VGO hydrotreating.
Article
Multidisciplinary Sciences
Chen Jihao, Li Juan, Li Yue, Zhang Jinjing
Summary: In this experiment, the distribution and composition of tar products resulting from pyrolysis of coal with different metal oxide supported catalysts were studied. Fe2O3/γ-Al2O3 catalyst showed the highest tar yield and improved the quality of tar.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Bastian Reiprich, Karolina A. Tarach, Kamila Pyra, Gabriela Grzybek, Kinga Gora-Marek
Summary: Layer-like FAU-type zeolite Y was successfully synthesized by an organosilane-assisted low-temperature hydrothermal method, and its catalytic activity in LDPE cracking was verified. The structure and properties of zeolite Y were analyzed using various techniques, and its catalytic performance and coking were evaluated through experiments on catalyst selectivity and coke residue.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Quentin Rivet, Remi Beucher, Franck Morfin, Thibaud Nardin, David Farrusseng
Summary: This study investigates the acidity of reforming catalysts and determines the concentration of Bronsted acid sites through measuring the adsorption of a probe molecule and the catalytic activity in a model reaction. The results demonstrate that the adsorption of 2,6-di-tert-butylpyridine is an effective method for characterizing the Bronsted acidity of alumina.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Jinghua Xu, Ruifeng Wang, Lirong Zheng, Junguo Ma, Wenjun Yan, Xiaofeng Yang, Junying Wang, Xiong Su, Yanqiang Huang
Summary: The study investigated the nature of Ni active sites using Ni supported on alumina-silica as the catalyst, and found that Ni+ sites exhibit unprecedented activity in ethylene oligomerization, potentially directly participating in the formation of active sites.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jian Wei, Ruwei Yao, Qingjie Ge, Dongyan Xu, Chuanyan Fang, Jixin Zhang, Hengyong Xu, Jian Sun
Summary: The study found that the Bronsted acid sites of ZSM-5 are the main active sites for aromatization, and increasing Bronsted acidity significantly promotes the synthesis of light aromatics. Further passivation of the external Bronsted acid sites by silylation process could inhibit alkylation of light aromatics and isomerization of xylene.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Zhenxiang Zhao, Jun Yang, Ningkun Xu, Tian Nan, Pingping Wu, Chunzheng Wang, Xiaohua Wang, Peng Bai, Zifeng Yan, Svetlana Mintova
Summary: In this study, a highly dispersed In-Sn oxide catalyst with decreased OH groups and increased coordinatively unsaturated sites (CUS) was successfully prepared. The presence of water had no deleterious effect on the catalyst's activity due to the formation of water-tolerant Lewis acid sites (LAS). As a result, a record-high MLA yield of 57.6% was achieved using the In-Sn oxide catalyst. This work provides a new strategy for the design of non-zeolite metal oxide catalysts with improved water tolerance and high activity.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Energy & Fuels
Nikita N. Sviridenko, Galina S. Pevneva, Natalya G. Voronetskaya
Summary: The heavy oil from the Mordovo-Karmalskoye oil field is cracked using a silica-alumina Al-Si catalyst and an Al-Si catalyst modified with NiCrWC. The study shows that the modified NiCrWC/Al-Si catalyst promotes more intensive destruction of resin-asphaltene components compared to the Al-Si catalyst. It also leads to more extensive transformations of hydrocarbons, resulting in a higher content of low-molecular-weight alkanes.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Monica J. Mendoza-Castro, Erika De Oliveira-Jardim, Nelcari-Trinidad Ramirez-Marquez, Carlos-Alexander Trujillo, Noemi Linares, Javier Garcia-Martinez
Summary: Interzeolite transformation has been used to produce a novel family of hierarchical catalysts with excellent textural properties, strong acidity, and superior catalytic performance. The properties of the catalysts can be fine-tuned by stopping the interconversion at different times.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Analytical
Kalyan Vuchuru, Srikanta Dinda, Vikranth Kumar Surasani
Summary: In this study, a numerical investigation and predictive coke model for the thermal cracking reactions of hydrocarbon fuels under supercritical conditions were developed and validated. The model showed good agreement with experimental data, demonstrating its high predictive accuracy.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Multidisciplinary
Huidong Liu
Summary: The conversion of solid residue from coal fly ash alumina extraction (FAAE) into aluminum-rich zeolite and silicon-rich zeolite was investigated in this research. The process involved alkali roasting, water leaching, and hydrothermal synthesis. The results showed that nearly 100% conversion of FAAE residue into zeolite products was achieved, and the tail liquid containing Na2CO3 could be completely recycled.
Article
Materials Science, Biomaterials
Narges Ghanbari, Zeinab Salehi, Abbas Ali Khodadadi, Mohammad Ali Shokrgozar, Ali Akbar Saboury
Summary: A novel targeted, trackable, and pH-responsive drug delivery system based on glucoseamine conjugated graphene quantum dots was developed for breast cancer cell-targeted therapy. Fluorescence microscopy and flow cytometry confirmed higher cellular internalization and cytotoxicity of the targeted nanocarrier compared to the non-targeted one.
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Reza Khaleghi Abasabadi, Abbas Ali Khodadadi, Yadollah Mortazavi
Summary: The study explores the impact of different types of carbon-nitrogen bonds on the activity and selectivity of the palladium active phase in the hydrogenation of cinnamaldehyde. Pyridinic nitrogen has a positive effect on the uniform distribution of Pd. The catalyst treated at 500 degrees Celsius shows high conversion and selectivity in the reaction.
RESEARCH ON CHEMICAL INTERMEDIATES
(2021)
Article
Chemistry, Physical
Hadis Mousavi, Yadollah Mortazavi, Abbas Ali Khodadadi, Mohammad Hossein Saberi, Samira Alirezaei
Summary: In this study, cheap sensors were used to detect pollutants in automotive exhaust gases. It was found that the reduced Pt/SnO2 sample showed significantly enhanced stable responses to CO and greater selectivities to CO compared to C3H8 and NO. This was attributed to the formation of a SnO-SnO2 p-n junction.
APPLIED SURFACE SCIENCE
(2021)
Article
Energy & Fuels
Fahimeh Esmi, Tahereh Nematian, Zeinab Salehi, Abbas Ali Khodadadi, Ajay K. Dalai
Summary: Fatty acid methyl ester (FAME) was synthesized from olive oil using Rhizopus oryzae lipase (ROL) immobilized on mesoporous silica magnetic nanoparticles (MNPs). The immobilized lipase showed increased enzyme loading efficiency and led to a higher biodiesel production compared to other nanobiocatalysts, making it a suitable nanomaterial for ROL immobilization. The physico-chemical properties of the MNPs were characterized and correlated with their activities for biodiesel synthesis.
Article
Engineering, Chemical
Mijin Kim, Jens-Uwe Repke, Reinhard Schomaecker, Abbas Ali Khodadadi, Guenter Wozny, Oliver Goerke, Hamid Reza Godini
Summary: A pseudo-homogeneous model was used to represent the thermal reaction performance of an oxidative coupling of methane (OCM) packed-bed catalytic reactor, taking into account the axial and radial heat and mass transfer characteristics. The model-based analysis was supported by extensive experimentation, aiming to differentiate the direct contribution of catalytic reactions and indirect contribution of the reactor's structural characteristics on the overall OCM reactor performance.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Thermodynamics
Mohammad Saleh Khodaparasti, Mohammad Reza Shirazvatan, Omid Tavakoli, Abbas Ali Khodadadi
Summary: Co-pyrolysis of microalgae Chlorella vulgaris and municipal sewage sludge was studied in a fixed-bed reactor to investigate the effects of temperature, mixing ratio, and Argon flow rate on pyrolysis products. The process was optimized using response surface methodology, and artificial neural network models were developed to simulate and predict pyrolysis yields. The study found that the mixing ratio had the most significant impact on bio-oil yield, while temperature had the highest influence on both biochar and biogas efficiency. The results demonstrate the potential for co-pyrolysis of microalgae and sewage sludge as a sustainable waste-to-energy conversion process.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Environmental Sciences
Zahra Eshaghi Gorji, Abbas Ali Khodadadi, Siavash Riahi, Timo Repo, Yadollah Mortazavi, Marianna Kemell
Summary: In this study, a series of organic compounds were immobilized on N-doped graphene quantum dots to prepare a multifunctional organocatalyst for the coupling reaction between CO2 and propylene oxide. The proposed catalysts demonstrated high activity and yielded excellent results under optimal conditions.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Chemistry, Physical
Fatemeh Gashoul Daresibi, Abbas Ali Khodadadi, Yadollah Mortazavi, Simo Huotari, Mikko Ritala
Summary: This study focuses on the CO2-oxidative dehydrogenation of propane (CO2-ODHP) using CrOx/SiO2 catalyst synthesized through atomic layer deposition (ALD) technique. The ALD catalysts exhibited higher acidity and reducibility compared to impregnation catalysts, as well as better dispersion of chromium oxide particles. The CO2-ODHP reactions using the ALD catalysts demonstrated improved propane conversion and propylene yield.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Analytical
Mehrdad Asgari, Fahimeh Hooriabad Saboor, Seyed Parsa Amouzesh, Martin Watt Coull, Abbas Ali Khodadadi, Yadollah Mortazavi, Takeo Hyodo, Yasuhiro Shimizu
Summary: SiO2/ZnO core/shell sensors were synthesized using ultrasonic-assisted deposition-precipitation method. The addition of silica as the core material enhanced the selectivity, stability, and reversibility of the sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Physical
Fatemeh Gashoul Daresibi, Abbas Ali Khodadadi, Yadollah Mortazavi
Summary: Ga2O3 was synthesized on a gamma-Al2O3 support using the atomic layer deposition method (ALD) for the CO2-oxidative dehydrogenation of propane (CO2-ODHP). The Ga loading was controlled by the number of ALD cycles, ranging from 1 to 2.9 wt%. The ALD catalysts exhibited higher activity and selectivity in the CO2-ODHP reaction compared to catalysts prepared with impregnation method, attributed to the higher surface total moderate acidity, Ga-O-Al linkages, and Ga2O3 dispersion. The ALD-3C catalyst, with 2.9% Ga loading, achieved 38% conversion and 82% selectivity to propylene after 120 minutes of CO2-ODHP reaction at 600 degrees Celsius, corresponding to a 96% improvement in propylene yield.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Physical
Hamide Mohammad Aliha, Abbas Ali Khodadadi, Yadollah Mortazavi, Mohammad Nader Lotfollahi
Summary: The aim of this study is to investigate a new method of fabricating SnO2/polyaniline (PAni) nanocomposite sensors for detecting ammonia at room temperature. The synthesis of PAni is conducted through oxidative polymerization, and SnO2/PAni hybrid nanocomposites with varying percentages of polymer are fabricated using a deposition-precipitation method in the presence of SnCl4 solution. XRD, BET, FTIR, Raman, TGA, and FESEM tests are carried out to characterize the produced powders. The results show that increasing the PAni content in the nanocomposites leads to a decrease in SnO2 crystallite size, an increase in surface area, and improved thermal stability. The SnO2/8 wt% PAni exhibits the highest sensitivity, with a response of approximately 187% for 100 ppm NH3 at room temperature. The optimal heteronucleation and decoration of SnO2 on the PAni surface enhance the sensor's response. Additionally, the sensor demonstrates selectivity in the presence of interfering gases such as CO, ethanol, methane, toluene, and trichloroethylene.
APPLIED SURFACE SCIENCE
(2023)
Article
Business
Mohammad Saleh Khodaparasti, Reza Khorasani, Omid Tavakoli, Abbas Ali Khodadadi
Summary: The effect of co-pyrolysis of municipal sewage sludge (MSS) and microalgae Chlorella Vulgaris (MCV) on pyrolysis products and synergistic effects was investigated. Changes in gas components at different temperatures and reaction times were analyzed using GC analysis. The co-pyrolysis bio-oil was found to be rich in fatty acids and amides compounds, providing a new direction for the high value-added utilization of biomass.
JOURNAL OF BUSINESS RESEARCH
(2023)
Article
Chemistry, Physical
S. Samaneh Bahrani, Abbas Ali Khodadadi, Yadolah Mortazavi
Summary: It has been found that selective deposition of NiO on MoOx/?-Al2O3 enhances the formation of active NiMoS catalytic phase, leading to improved hydrodesulfurization activity. Catalysts prepared by selective atomic layer deposition (S-ALD) showed higher desulfurization conversions at lower reaction temperatures and pressures compared to those prepared by impregnation. HR-TEM and XPS characterization revealed that the enhanced activity of S-ALD catalysts is attributed to the formation of more active NiMoS catalytic phase with higher sulfidability than their impregnation counterparts.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Nasim Afzali, Mostafa Torka Beydokhti, Abbas Ali Khodadadi, Yadollah Mortazavi
Summary: In this study, flower-like Ni-doped SnS2 was synthesized using a hydrothermal method, and its oxidation extent was controlled by air oxidation. The results showed that partial oxidation increased the surface area of SnS2 and enhanced its photocatalytic activity. Tuning the oxidation extent and Ni doping can regulate the band gap and defect recombination rate of heterostructures. The Ni-doped 0.34 wt% SnS2 with 43% oxidation showed the highest photocatalytic conversion.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)