Review
Green & Sustainable Science & Technology
Anas Abdullah, Ahmad Zuhairi Abdullah, Mukhtar Ahmed, Junaid Khan, Mohammad Shahadat, Khalid Umar, Md Abdul Alim
Summary: The catalytic dehydration of glycerol to acrolein is a promising research topic with commercial prospects. Recent studies have focused on reducing catalyst deactivation, improving catalyst stability, and optimizing reaction parameters. Promising results have been achieved through altering catalyst structure, introducing new techniques and methods.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Augusto L. P. de Meireles, Kelly A. da Silva Rocha, Elena F. Kozhevnikova, Ivan V. Kozhevnikov, Elena V. Gusevskaya
Summary: The H3PW12O40 heteropoly acid supported on SiO2 as a catalyst and its bulk acidic cesium salt Cs2.5H0.5PW12O40 have been demonstrated to be highly active and recyclable for the Prins cyclization reaction, leading to the efficient synthesis of the valuable floral odorant Florol? from isoprenol and isovaleraldehyde. The use of dimethylcarbonate or diethylcarbonate as green reaction media, along with low catalyst loadings and moderate conditions, contribute to the sustainability of the method.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
Marcio Jose da Silva, Pedro Henrique da Silva Andrade, Vinicius Fernando Coelho Sampaio
Summary: The catalytic activity of transition metal-substituted potassium silicotungstate salts on the oxidation reactions of terpene alcohols was investigated in this work. Among the salts studied, K5SiFeW11O39 showed the highest activity and selectivity, attributed to its highest Lewis acidity.
Article
Engineering, Environmental
Alireza Lotfollahzade Moghaddam, Melanie Jane Hazlett
Summary: Environmental pollution and global warming have become urgent issues worldwide. To tackle these issues, renewable and sustainable energy resources are needed, such as dimethyl ether (DME) which can be derived from syngas and CO2. Bi-functional catalysts have been studied to directly synthesize DME and improve the efficiency compared to the conventional indirect process. Different reactors and solid acid catalysts for methanol dehydration in both direct and indirect processes have been discussed. Factors affecting the catalyst performance, such as particle size, pore structures, and preparation methods, have also been reviewed. The thermodynamically preferable direct route should be further investigated and modified to overcome the challenges posed by water and optimize operational conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Rahul Gautam, Priyanka Pal, Shunmugavel Saravanamurugan
Summary: The study focuses on incorporating Lewis acidic metal Sn into H-ZSM-5 zeolite through desilication and dealumination to generate mesopores, and investigates its catalytic activity for glucose isomerisation. The Sn(4)ZS(180)A(15) catalyst shows enhanced surface area, mesopore volume, and acidic sites compared to the parent H-Z. DRS-UV-Vis and XPS results confirm the incorporation of Sn into the framework of Sn(4)ZS(180)A(15). The Sn(4)ZS(180)A(15) catalyst exhibits high catalytic activity for glucose isomerisation, while the parent H-Z and Sn-incorporated catalysts without desilication-dealumination process show low activity.
Review
Chemistry, Multidisciplinary
Jan-Christian Raabe, Maximilian J. J. Poller, Dorothea Voss, Jakob Albert
Summary: Polyoxometalates (POMs) are anionic metal-oxide clusters with diverse structures and catalytic applications, particularly in the conversion of bio-derived platform chemicals. HPA-5, a unique POM catalyst, has been extensively studied due to its rational synthesis, detailed characterization, and suitability for important catalytic transformations of bio-based feedstock. This Review combines the fields of synthesis, spectroscopic, electrochemical, and crystallographic characterization of HPA-5 with sustainable catalysis and green chemistry, showcasing its broad application scope for biomass valorization.
Article
Chemistry, Multidisciplinary
Xinyu Li, He Han, Wenqian Xu, Son-Jong Hwang, Zhichen Shi, Peng Lu, Aditya Bhan, Michael Tsapatsis
Summary: Low-silica faujasite zeolites sustain framework integrity and porosity upon moderate ion exchange, introducing two kinds of protons within supercages. Protons on site II exhibit higher reactivity for propane reactions compared to protons on site III. Low-silica proton-form FAU zeolites possess protons on site III and provide high-temperature structural and chemical stability, enabling their application as solid-acid catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Organic
Dipak S. Aher, Kiran R. Khillare, Laxmikant D. Chavan, Vinod A. Shelke, Sunil G. Shankarwar
Summary: Vanadium substituted Molybdotungstophosphoric acid (H5PW6Mo4V2O40 center dot 14H(2)O) was found to be an effective solid catalyst for the one-pot synthesis of several quinoxaline derivatives from the condensation reaction between various substituted o-phenylenediamine and various aromatic benzil compounds in ethanol: water (1:1) solvent under reflux conditions. The synthetic route exhibited excellent yield, short reaction time, simple workup procedure, and reusability of the catalyst.
SYNTHETIC COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Peng Zhang, Xiangyang Mao, Rongli Mi, Lu Wang, Bolun Yang
Summary: An effective and environmentally friendly method was proposed to prepare mesoporous SiO(2)encapsulated phosphotungstic acid (HPW) catalysts for alkylation desulfurization of 3-methylthiophene (3-MT). The characterized results showed that the HPW structure was maintained and there was a strong interaction between HPW and SiO2. The catalysts demonstrated superior activity compared to reported SBA-15 encapsulated HPW catalysts, achieving a 99% conversion of 3-MT.
Article
Chemistry, Multidisciplinary
Max J. Hulsey, Geng Sun, Philippe Sautet, Ning Yan
Summary: The article discusses the use of electrospray ionization mass spectrometry (ESI-MS) to study single-atom catalysts supported on polyoxometalates in catalytic reactions, revealing the composition of active sites and their evolution in the catalytic cycle.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Harry R. M. Aitken, Tom H. Wright, Aleksandar Radakovic, Jack W. Szostak
Summary: The challenge in origin-of-life research is to find conditions that facilitate the transition from chemistry to biology. The incompatibility of nucleotide activation chemistry and nonenzymatic template-directed RNA copying has hindered the identification of such conditions. However, this study shows that adding heteroaromatic molecules to the reaction network allows for nucleotide activation and RNA copying to occur simultaneously, suggesting the potential role of prebiotic heteroaromatic molecules in the transition from chemistry to biology.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Energy & Fuels
Jens Tochtermann, Michael Huber, Wolfgang Korth, Jakob Albert, Andreas Jess
Summary: The capability of extraction-coupled oxidative desulfurization (ECODS) to remove refractory sulfur compounds from a model fuel has been investigated. Thiophene and benzothiophene degrade into water-soluble substances, while dibenzothiophene requires the reaction with sulfoxides and sulfones to form water-soluble products.
Article
Biochemistry & Molecular Biology
Diana Juliao, Fatima Mirante, Salete S. Balula
Summary: This work presents an efficient and fast method for valorizing glycerol, the main waste from the biodiesel industry. The acetalization of glycerol with acetone is an effective strategy to produce solketal, a valuable fuel additive component. The catalytic efficiency of different commercial heteropolyacids (HPAs) was compared and it was found that HPAs demonstrated high efficiency and selectivity under sustainable conditions.
Article
Chemistry, Multidisciplinary
Fareeha Marriam, Adnan Irshad, Isra Umer, Muhammad Arslan Asghar, Muhammad Atif
Summary: Epoxy is widely used in industry for various applications, but its production from fossil fuels causes environmental pollution. Epoxidized vegetable oils (EVOs) are a potential replacement for fossil fuel-based epoxy due to their abundance, renewability, non-toxicity, and environmental friendliness. This review provides a compilation of information on different methods of oxidizing vegetable oils and the applications of epoxidized vegetable oils.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Review
Chemistry, Physical
Amudhavalli Victor, Pankaj Sharma, Indra Neel Pulidindi, Aharon Gedanken
Summary: Levulinic acid (LA) is a biomass-derived chemical listed by the US Department of Energy, which can be used as a building block for producing various chemicals, fuels, and materials. LA has the potential to replace fossil-based refineries in the production of fuel-grade chemicals and plastic substitutes. LA can be derivatized to different products through various reactions. Various biomass feedstocks have been successfully converted to LA with high yields. The use of ultrasound and microwave technologies has shown promising results in the production of LA.
Article
Chemistry, Multidisciplinary
Muhammad Nadeem Akhtar, Murad A. AlDamen, Magdalena Fitta, M. Shahid, Alexander M. Kirillov
Summary: This study describes the synthesis of two new heterometallic Fe(6)Ln clusters and investigates their unique crystal structure and magnetic properties.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Applied
Muhammad Nadeem Akhtar, Murad A. AlDamen, M. Shahid, M. Shahwaz Ahmad, Muhammad Khalid, Azeem Intisar, Muhammad Usman Khan
Summary: Three [Fe-6-Ln(4)] clusters were obtained using N-methyldiethanolamine and 3,5-dinitrobenzoic acid as ligands with sodium azide. X-ray study revealed that these compounds have the same structure and are centrosymmetric. These clusters also exhibit catecholase activity and serve as functional models for metalloenzymes.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Biotechnology & Applied Microbiology
Muhammad Uzair Javed, Hamid Mukhtar, Muhammad Tahir Hayat, Umer Rashid, Muhammad Waseem Mumtaz, Chawalit Ngamcharussrivichai
Summary: Nearly 15 billion metric tons of fossil fuels are consumed each year, leading to the depletion of non-renewable energy resources. The global energy demand is projected to increase significantly, creating a need for alternative energy sources. This review article discusses various biomass conversion technologies and their potential to meet future energy needs.
JOURNAL OF BIOTECHNOLOGY
(2022)
Article
Chemistry, Physical
Muhammad Nadeem Akhtar, M. Shahid, M. Shahwaz Ahmad, Wiktor Zierkiewicz, Mariusz Michalczyk, Muhammad Babar Taj, Muhammad Khalid, Muhammad Asif Hanif
Summary: The study investigated the catecholase activity, DFT calculations, Hirshfeld surface analysis, and docking studies of a hexanuclear iron(III) cluster. The results showed the first hexanuclear iron cluster with catecholase activity, supported by DFT calculations and Hirshfeld surface analysis. Docking studies revealed various theoretical features between the complex and DNA.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Engineering, Environmental
Balkis Hazmi, Umer Rashid, Sibudjing Kawi, Wan Nur Aini Wan Mokhtar, Thomas Choong Shean Yaw, Bryan R. Moser, Ali Alsalme
Summary: The accumulation of plastic waste poses a serious threat to the environment, and finding solutions is crucial. This study successfully transformed waste polyethylene terephthalate containers into plastic waste char and then converted it into an acidic solid catalyst for biodiesel production. The findings provide a promising solution to the environmental issue of plastic waste.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Environmental
Aroosh Shabbir, Hamid Mukhtar, Muhammad Waseem Mumtaz, Umer Rashid, Ghulam Abbas, Bryan R. Moser, Ali Alsalme, Tooba Touqeer, Chawalit Ngamcharussrivichai
Summary: Biodiesel produced from low-cost, inedible tallow using Lewatit-immobilized lipase showed promising fuel properties and reduced exhaust emissions compared to petro-diesel. The two-step chemical-mediated transesterification achieved a higher conversion rate compared to the single-step lipase-mediated method. The research also revealed the potential of waste animal fats for biodiesel production and a new efficient lipase source.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Maria Khalil, Muhammad Asif Hanif, Umer Rashid, Junaid Ahmad, Ali Alsalme, Toshiki Tsubota
Summary: The present study focuses on the preparation and utilization of granite stone powder waste composite for the effective removal of Terasil dye. The results showed that the granite composites prepared using sodium metasilicate exhibited an exceptionally high dye adsorption capacity. Characterization techniques such as scanning electron microscopy and Fourier transform infrared spectroscopy were employed to determine the morphological features and functional groups of the granite composites.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Polymer Science
Aamna Ashfaq, Raziya Nadeem, Hongyu Gong, Umer Rashid, Saima Noreen, Shafique ur Rehman, Zubair Ahmed, Muhammad Adil, Nayab Akhtar, Muhammad Zeeshan Ashfaq, Fahad A. Alharthi, Elham Ahmed Kazerooni
Summary: This research study explored a simple, efficient, and environmentally friendly method for the biosorption of Cr(VI) ions using agrowaste-based adsorbents. The synthesized TiO2 nanocomposite was found to be the most effective in removing Cr(IV) from aqueous solution.
Article
Chemistry, Physical
Muhammad Nadeem Akhtar, Murad A. AlDamen, Wiktor Zierkiewicz, Mariusz Michalczyk, Amin Khan, Kiran Fouzia, Tahir Ali Sheikh, Muhammad Imran
Summary: This article presents a oxo-centred, carboxylate bridged trinuclear iron(III) coordination cluster and investigates its structure and properties through experimental and theoretical methods.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Applied
Umer Rashid, Balkis Hazmi, Rose Fadzilah Abdullah, Siti Fadhilah Ibrahim, Ali Alsalme, Toshiki Tsubota
Summary: In this study, palm kernel shell-based char was developed and utilized for synthesizing bifunctional carbon catalyst. The catalyst showed higher surface area and stronger acid-base properties, making it suitable for efficient esterification and transesterification reactions.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Physical
Tahir Ali Sheikh, Abdullah M. Asiri, Amna Siddique, Hadi M. Marwani, Md. Rezaur Rahman, Muhammad Nadeem Akhtar, Mohammed M. Rahman
Summary: A novel electrochemical current-potential (I-V) approach was developed using a highly calcined binary metal oxide (Er2O3@NiO) semiconductor nanocomposite to detect and degrade toxic chemicals in aqueous medium. The modified glassy carbon electrode based on this semiconductor nanocomposite showed selectivity towards m-tolyl hydrazine (m-Tolyl HDZN) and good affinity towards other interfering toxic chemicals. Analytical parameters were optimized and the limit of detection (LOD) for m-Tolyl HDZN was calculated.
Article
Chemistry, Physical
Hafsa Saleem, Muhammad Nadeem Akhtar, Rahman Bikas, Neda Heydari, Amin Khan, Aziz B. Ibragimov, Muhammad Khalid, Anna Kozakiewicz-Piekarz
Summary: Two novel Zn(II) complexes, [Zn(2-MeImi)2(benz)2] (1) and [Zn(2-MeImi)2(piv)2] (2), were synthesized using Zn(NO3)2.6H2O, 2-methylimidazole (2-MeImi), benzoic acid (benz), and pivalic acid (piv). The complexes were characterized by UV, IR, elemental analysis, thermogravimetric study, and single X-ray crystallography. Both complexes exhibited distorted tetrahedral geometry with 2-methylimidazole and two carboxylates acting as coordinating ligands. Photoluminescence (PL) measurements showed broad peaks, suggesting the presence of defect states of zinc. Intermolecular interactions in the complexes were analyzed using 3D Hirshfeld surface analysis and 2D fingerprint plots. DFT calculation further confirmed the structural parameters and electronic transitions of the complexes, which were consistent with the experimental findings.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Inorganic & Nuclear
Shazia Waseem, Hafsa Saleem, Muhammad Nadeem Akhtar, Muhammad Imran, Ayesha Javaid, Murad A. Aldamen, Rahman Bikas, Monther A. Khanfar
Summary: A novel zinc coordination polymer was synthesized and characterized in this study. The results showed that this polymer exhibited excellent photocatalytic performance under UV light, with a maximum degradation rate of 72.56% for methylene blue dye. Furthermore, the polymer demonstrated stable recyclability and could be a promising option for efficient and cost-effective photocatalytic elimination of pollutants from wastewater.
INORGANICA CHIMICA ACTA
(2024)
Article
Chemistry, Physical
Abdullaev Akhrorjon Khabibjonovich, Yakubov Yuldosh Yusupboevich, Ruzmetov Abror Khamidjanovich, Normamatov Adkhamjon Sadullayevich, Ibragimov Aziz Bakhtiyarovich, Muhammad Nadeem Akhtar, Murad A. Aldamen, Ashurov Jamshid Mengnorovich
Summary: A one-dimensional Mn coordination polymer was synthesized via hydrothermal method and characterized by X-ray. The thermal degradation of the polymer and its sorption properties were studied. The results showed that the polymer had a surface area of 318.4642 m2/g and exhibited adsorption behavior towards benzene vapor and water vapor.
JOURNAL OF MOLECULAR STRUCTURE
(2024)
Article
Chemistry, Physical
Mudassir Jamil, Muhammad Nadeem Akhtar, Muhammad Imran, Ayesha Javaid, Hafiza Komal Zafar, Manzar Sohail, Murad A. Aldamen, Magdalena Fitta, Monther A. Khanfar, Raed A. Al-Qawasmeh
Summary: In this study, a copper(II) complex was prepared and characterized. The complex showed good photocatalytic activity under UV light irradiation, with an optimized photocatalytic activity of 70.71%. Additionally, the complex exhibited a low overpotential and good stability in the oxygen evolution reaction.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)