Article
Green & Sustainable Science & Technology
Huanting Hu, Kangkang Miao, Xiaolin Luo, Sifan Guo, Xueqin Yuan, Fei Pei, Huaming Qian, Guodong Feng
Summary: The study demonstrated that Cu-doped SBA-15 with a Cu/Si molar ratio of 0.133 exhibited the best catalytic activity in the oxidative degradation of high-concentration chlorophenols, with an apparent reaction rate constant of 0.170 min(-1) for 4-chlorophenol. After 300 minutes of reaction, the total organic carbon content in the solution decreased to 23.8%. The results suggest the potential of Cu-doped SBA-15 for effective treatment of industrial wastewater containing high levels of chlorophenols.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Yu Zhu, Luyao Jin, Yanghui Wang, Baoying Hu, Jiaying Li, Bo Hu, Xuesong Liu
Summary: Cu, Fe/SBA-15 catalysts were prepared and characterized in this study. The results showed that SBA-15 has a highly ordered mesoporous structure and the loading of active components does not disrupt it. The catalyst with Cu: Fe=2:1 exhibited the best catalytic performance, and the Cu-Fe synergistic effect significantly improved the performance of the catalysts.
MOLECULAR CATALYSIS
(2023)
Article
Nanoscience & Nanotechnology
Xingjie Wang, Zoha H. Syed, Zhihengyu Chen, J. David Bazak, Xinyi Gong, Megan C. Wasson, Nancy M. Washton, Karena W. Chapman, Justin M. Notestein, Omar K. Farha
Summary: In order to increase catalytic efficiency, researchers have successfully introduced a redox-active heterometallic Ce12V6-oxo cluster into mesoporous silica material SBA-15, demonstrating improved structural integrity and higher reactivity, which provides new insights for catalyst design and applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Madalina Ciobanu, Gabriela Petcu, Elena M. Anghel, Florica Papa, Nicoleta G. Apostol, Daniela C. Culita, Irina Atkinson, Silviya Todorova, Maya Shopska, Anton Naydenov, Ralitsa Velinova, Viorica Parvulescu
Summary: A series of PtCeTi-SBA-15 catalysts with different Pt concentrations were synthesized and characterized, showing the influence of Pt and ceria addition on surface properties and oxidation conversion of hydrocarbons. CO oxidation, however, was found to be independent of the catalyst composition.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Energy & Fuels
Norshakirah Ahmad Rashidi, Elnida Mustapha, Yeow Yean Theng, Noor Azira Abdul Razak, Najihah Abdul Bar, Khairul Basyar Baharudin, Darfizzi Derawi
Summary: Waste cooking oil is an attractive feedstock for producing advanced biofuels due to its low cost and abundant availability. This study focused on the synthesis and analysis of mesoporous bimetallic catalysts for the catalytic deoxygenation of waste cooking oil. The results showed that the catalyst with 10% Ni-Fe/SBA-15 had the highest liquid yield but low selectivity towards the diesel fraction, while the catalyst with 5% Ni-Co/SBA-15 had the highest selectivity towards the diesel fraction.
Article
Chemistry, Physical
Diganta Bhuyan, Sanmilan Jyoti Kalita, Lakshi Saikia
Summary: The surface modification of SBA-15 enhances its adsorption capability for tetrachloroauric anion, leading to the generation of uniform gold nanoparticles on SBA-15. The resulting SBA-15/Au-0 nanohybrid material exhibits excellent catalytic activity for the selective oxidation of cyclohexane and can be recycled multiple times without significant loss in activity.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Chemical
P. Tamizhdurai, S. Narayanan, R. Kumaran, V. L. Mangesh, C. Kavitha, N. Vidhya Lakshmi, C. Ragupathi, Zeid A. ALOthman, Mohamed Ouladsmane, G. Mani
Summary: The Pt/CeO2 (15%)-SBA-15 composite catalyst exhibits excellent catalytic performance in benzyl alcohol conversion, with high conversion rate and selectivity, as well as good catalytic activity and stability demonstrated through exploration of reaction parameters and recycling studies.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Environmental Sciences
Xianni Song, Wenyang Jiang, Junhua Zhang
Summary: The complete degradation of high concentration polyvinyl alcohol (PVA) is a challenging task. This article presents a two-stage process using NaClO pre-oxidation and columnar activated carbon loaded with metal active components for treating high concentration PVA wastewater successfully. The optimized catalyst composition and reaction conditions were determined, and the degradation mechanism was discussed.
Article
Chemistry, Applied
P. Tamizhdurai, A. Abilarasu, S. Narayanan, C. Ragupathi, Mani Govindasamy, Ayman A. Ghfar, Murefah Mana AL-Anazy, Mohamed Ouladsmane
Summary: The study focused on the performance of titanium-doped SBA-15 catalyst in the BzOH conversion process, determining the optimal catalyst composition and reaction conditions. The research showed that the prepared catalyst exhibited good stability in repeated use.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Chemistry, Physical
G. Dhinagaran, G. Harichandran, S. Prashanna Suvaitha, K. Venkatachalam
Summary: Selective oxidation of veratryl alcohol to veratraldehyde using a newly developed CuO/SBA-15 catalyst showed high conversion and selectivity. The catalyst demonstrated activity towards substrates containing both primary and secondary alcohols, but selectively oxidized the secondary alcohol when both were present on adjacent carbons.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Applied
Yue Zhang, Li Wang, Nan Wang, Guohua Gao, Zhiyong Pan, Baoning Zong
Summary: Monodispersed mesoporous SBA-15 silica was synthesized by adding n-decane to conventional synthesis recipe, and the Pd catalyst prepared on it exhibited superior catalytic performance in 2-alkyl-anthraquinone hydrogenation.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Meicheng Wen, Shengnan Song, Weina Zhao, Qiuxia Liu, Jiangyao Chen, Guiying Li, Taicheng An
Summary: The study presents a scalable and economically feasible approach to prepare atomically dispersed Pd sites on titanium substituted ordered mesoporous silica for catalytic combustion. The catalyst exhibits excellent catalytic activity towards cyclohexane, n-hexane, and styrene combustion, maintaining 100% mineralization. The outstanding catalytic performance is attributed to the considerable amount of acid sites derived from Ti substitution and the maximized Pd utilization realized by atomic Pd sites.
ENVIRONMENTAL SCIENCE-NANO
(2021)
Article
Engineering, Chemical
Rafael F. Perez, Luiz E. P. Borges, Marco A. Fraga
Summary: The study found that Zr-SBA-15 mesoporous catalysts can effectively convert xylose to furfuryl alcohol, but the activity and product distribution are significantly affected by the ratio of water to 2-propanol in the liquid phase.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Ahmed S. Al-Fatesh, Samsudeen O. Kasim, Ahmed A. Ibrahim, Ahmed Osman, Ahmed E. Abasaeed, Hanan Atia, Udo Armbruster, Leone Frusteri, Abdulrahman bin Jumah, Yousef Mohammed Alanazi, Anis H. Fakeeha
Summary: This study investigated the performance of supported Ni catalysts in the utilization of greenhouse gases like CO2 and CH4 via dry reforming. The results showed that the catalyst with 0.5% Sc loading led to the highest conversion and the lowest relative activity loss. The average methane and carbon dioxide conversions were 78% and 86%, respectively, at 750 degrees C. The catalyst demonstrated relatively constant methane and carbon dioxide conversions over 80 hours on stream.
Article
Chemistry, Physical
Zengqi Lu, Xiaolong Fu, Jiamao Li, Jingwei Hou, Guangming Ran, Chengjian Xiao, Xiaolin Wang
Summary: A hydrophobic microscopic reaction environment was constructed through the modification of mesoporous silica, which helped improve the catalytic activity of the LPCE reaction. The Pt@SBA-15-tetramethyldisilazane catalyst, prepared by modifying the SBA-15 carrier and loading metal Pt, exhibited a superhydrophobic structure with a water contact angle of 158 degrees. This structure enhanced the catalytic performance and prevented catalyst deactivation. Experimental results showed that the catalyst had good catalytic activity in tritium water and maintained high activity after 30 days.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Environmental Sciences
Qicheng Qiao, Seema Singh, Ritesh Patidar, Lizhang Wang, Ya Li, Jian Shi, Vimal Chandra Srivastava, Shang-Lien Lo
Summary: The present study explored the roles of PDS radicals and SO4 center dot- radicals formed from SO42- during the electrochemical oxidation of PFOA. The study investigated the effects of different electrolytes, initial pH, current density, electrolyte dosage, and initial concentration of PFOA on the decomposition of PFOA using electrochemical oxidation. The results showed that (OH)-O-center dot induced oxidation and direct electron transfer reaction played a crucial role in the oxidation of PFOA.
Article
Engineering, Chemical
Nilambar Bariha, Deepak Kumar Ojha, Vimal Chandra Srivastava, Indra Mani Mishra
Summary: This article focuses on the analysis of risks associated with gas transfer operations in an LPG bottling plant in India. Due to urban expansion, these plants are now surrounded by residential and business areas. The frequency of transfer operations has also increased in order to maintain the supply chain. Accidental release of LPG during these operations can have severe consequences such as fire and explosions. The study classifies and analyzes the operations in various hazard zones and models the probability and consequences of accidents using tools like ALOHA and PHAST. The estimated thermal radiation can cause damage to nearby population and plant machinery.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Chemistry, Multidisciplinary
Ananda Jaysing Jadhav, Vimal Chandra Srivastava
Summary: In spectrophotometry, it is challenging to determine the concentration of chemical constituents in mixtures due to spectral interferences and close lambda max wavelengths. This paper presents a model based on a genetic algorithm and partial least squares to estimate the concentrations of components in ternary synthetic mixtures. The model was verified using different mixtures, and the results showed improved accuracy with the genetic algorithm.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2023)
Article
Polymer Science
Anuj Rawat, Raeesh Muhammad, Vimal Chandra Srivastava, Paritosh Mohanty
Summary: The hypercrosslinking of benzene using formaldehyde dimethyl acetal as the crosslinker, anhydrous ferric chloride as the catalyst, and 1,2 dichloroethane as the solvent for the synthesis of poly-benz is reported. Microwave-assisted synthesis resulted in the formation of nanoporous poly-benz with a specific surface area of 1168 m2 g-1 within 60 minutes. Thorough analysis using NMR and XPS revealed the hypercrosslinking at the meta position of the benzene ring. The synthesized poly-benz showed a high CO2 capture capacity of 65.3 wt % at 298 K and 30 bar, and different adsorption isotherm models were fitted to represent the equilibrium CO2 adsorption data at various temperatures.
Article
Chemistry, Physical
Kavisha Dang, Navneet Kumar, Vimal Chandra Srivastava, Jinsub Park, Mu. Naushad
Summary: A series of CaO-MgO catalysts were prepared using different precipitating agents and Mg/Ca ratios. The physiochemical characteristics of the catalysts were analyzed using various techniques. The catalysts were tested for propylene carbonate synthesis and the effects of composition, dose, temperature, and contact time were investigated. The best catalyst achieved a high PC yield with good selectivity and reusability, showing potential for the synthesis of organic carbonates.
Editorial Material
Energy & Fuels
Vimal Chandra Srivastava, Hari Prakash Veluswamy, Deepak Kumar Ojha
Article
Engineering, Chemical
Surbhi Dahiya, Pankaj Kumar, Vimal Chandra Srivastava, Vimal Kumar
Summary: In the presence of specific catalysts made using the coprecipitation approach, methanol and propylene carbonate react to yield dimethyl carbonate and propylene glycol through the transesterification process. The catalytic activity of mixed Zr1-xPrxO2 was investigated towards the formation of DMC and PG, and the catalysts were characterized using SEM, FTIR spectroscopy, and CO2-TPD. DFT calculations were performed to understand the effect of combining praseodymium and zirconium on the yield and selectivity of DMC. Zr0.96Pr0.04O2 showed the highest PC conversion (95.9%), with a yield of 52.5% and selectivity of 54.7% at specific reaction conditions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Tanveer Rasool, Vimal Chandra Srivastava, Pratik Toshniwal, Ishfaq Najar, Vikash Singh
Summary: This study evaluated the kinetic and thermodynamic parameters of co-pyrolysis of wood pellets and petroleum coke blends. It was found that the reaction order increases with increasing heating rate, and the average activation energy was calculated to be 119.6 kJ mol-1 (OFW) and 126.2 kJ mol-1 (KAS). The values for ΔH, ΔG, and ΔS were consistent with previous studies, and ΔG was observed to be around 182 kJ mol-1. The study also identified the mechanisms of diffusion and chemical reaction during the thermal degradation process.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Materials Science, Multidisciplinary
Seema Singh, Ritesh Patidar, Vimal Chandra Srivastava, Praveen Kumar, Ajay Singh, Shang-Lien Lo
Summary: In this study, ellipsoid-shaped cupric oxide (CuO) nanoparticles were synthesized using a simple hydrothermal method and subsequent heat treatment. The catalysts showed excellent peroxymonosulfate (PMS) activation ability for the degradation of perfluorooctanoic acid (PFOA). Various operating parameters were investigated, and it was found that singlet oxygen (1O2) played a key role in the oxidative-reductive mechanism of PFOA degradation. Additionally, a two-step pseudo-first-order kinetic model was proposed and minimal metal leaching was observed after repeated use.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Green & Sustainable Science & Technology
Anuj Rawat, Raeesh Muhammad, Raj K. Singh, Pratiksha Rashmi, Pratiksha Joshi, Om P. Khatri, Vimal Chandra Srivastava, Paritosh Mohanty
Summary: A sustainable method using high surface area nanoporous adsorbents synthesized from polycyclic aromatic hydrocarbons (PAHs) effectively removes polycyclic aromatic sulphur heterocycles (PASHs) from fuels. By hypercrosslinking PAHs through a microwave assisted method, nanoporous polymeric materials with high surface area (SABET of 620-1565 m2 g-1) are synthesized. The adsorbent poly-naph (highest SABET, i.e., 1565 m2 g-1) demonstrates excellent desulphurization performance from batch to fixed bed column mode. The adsorption mechanism is attributed to the π-electron density in the polymeric framework and the high surface area. This approach requires technological advancement, financial assistance and governmental regulation to sustain the control of carcinogenic aromatic pollutants.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Sarvesh Namdeo, Vimal Chandra Srivastava, Paritosh Mohanty
Summary: This study used six supervised machine learning models to understand and predict the CO2 adsorption mechanism and uptake, with the GBDT model outperforming the others. The SHAP method was employed to explain the relationships and provide feature importance analysis. This research is of great significance for the development of CO2 adsorption and prediction methods.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Vikash Singh, Seon Yeong Park, Eun Seo Lee, Jun Ho Choi, Chang Gyun Kim, Vimal Chandra Srivastava
Summary: The co-combustion characteristics and synergy of distillery effluent sludge (DES) and sugar mill waste (SMW) were studied by thermogravimetric analysis. The blend of 25% DES and 75% SMW exhibited optimal combustion parameters and the presence of Fe, Ca, and Mg in DES facilitated effective combustion. The ash from the combustion process can be considered as a possible supplementary cementing material.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2023)
Article
Engineering, Environmental
Seema Singh, Praveen Kumar, Ritesh Patidar, Vimal Chandra Srivastava, Shang-Lien Lo, Urska Lavrencic Stangar
Summary: In this study, Co3O4 nanospheres with excellent surface properties were synthesized and used for the degradation of BPA. The nano-Co3O4/PMS system effectively degraded BPA (approximately 92%) at neutral pH with low cobalt leaching and good recyclability. Chemical quenching studies confirmed the involvement of hydroxyl radicals and sulfate radicals in BPA oxidation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Seema Singh, Ritesh Patidar, Vimal Chandra Srivastava, Qicheng Qiao, Praveen Kumar, Ajay Singh, Shang-Lien Lo
Summary: This study synthesized low-toxicity and eco-friendly spherically shaped manganese oxides (alpha-MnO2, Mn2O3, and Mn3O4) using the chemical precipitation method. The variable oxidation states and diverse structures of manganese-based materials have a strong impact on electron transfer reactions. The as-prepared manganese oxides (MnOx) exhibited excellent catalytic activity for the degradation of rhodamine B (RhB) organic pollutant in the presence of peroxymonosulfate (PMS) under acidic conditions. The different oxidation states of MnOx promote oxidative-reductive reactions and the higher surface area provides ample absorption sites for pollutant interactions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Pankaj Kumar, Vimal Chandra Srivastava
Summary: The size-dependent activity of catalysts has been investigated in catalysis for a long time. Positively charged small Pt clusters exhibit higher catalytic activity compared to larger clusters and bulk for propane dehydrogenation. Computational studies were performed on small Pt clusters adsorbed on silica support, revealing their planar structures and the formation of directional bonds with the support. Ethane and propane molecules undergo dehydrogenation reactions with different activation energies depending on the size of the Pt clusters and the mechanism followed.
