Bibliografías temáticas / Calcium catalysts

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Literatura académica sobre el tema "Calcium catalysts"

Autor: Grafiati
Publicado: 25 de enero de 2025
Última modificación: 31 de julio de 2025

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Artículos de revistas sobre el tema "Calcium catalysts"

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Mazaheri, Hoora, Hwai Chyuan Ong, Zeynab Amini, et al. "An Overview of Biodiesel Production via Calcium Oxide Based Catalysts: Current State and Perspective." Energies 14, no. 13 (2021): 3950. http://dx.doi.org/10.3390/en14133950.

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Biodiesel is a clean, renewable, liquid fuel that can be used in existing diesel engines without modification as pure or blend. Transesterification (the primary process for biodiesel generation) via heterogeneous catalysis using low-cost waste feedstocks for catalyst synthesis improves the economics of biodiesel production. Heterogeneous catalysts are preferred for the industrial generation of biodiesel due to their robustness and low costs due to the easy separation and relatively higher reusability. Calcium oxides found in abundance in nature, e.g., in seashells and eggshells, are promising
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Stegner, Philipp C., Jonathan Eyselein, Gerd M. Ballmann, Jens Langer, Jochen Schmidt, and Sjoerd Harder. "Calcium catalyzed enantioselective intramolecular alkene hydroamination with chiral C2-symmetric bis-amide ligands." Dalton Transactions 50, no. 9 (2021): 3178–85. http://dx.doi.org/10.1039/d1dt00173f.

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Enantioselective catalysis with calcium catalysts is challenging due to facile loss of the chiral spectator ligand. Herein a series of bis-amide calcium catalysts with chiral binaphtalene bridges is introduced.
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Díaz-Muñoz, L. L., H. E. Reynel-Ávila, D. I. Mendoza-Castillo, A. Bonilla-Petriciolet, and J. Jáuregui-Rincón. "Preparation and Characterization of Alkaline and Acidic Heterogeneous Carbon-Based Catalysts and Their Application in Vegetable Oil Transesterification to Obtain Biodiesel." International Journal of Chemical Engineering 2022 (July 20, 2022): 1–13. http://dx.doi.org/10.1155/2022/7056220.

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This paper reports the preparation, evaluation, and comparison of alkaline and acidic heterogeneous carbon-based catalysts in the transesterification of safflower oil with methanol to obtain biodiesel. These catalysts were obtained from the pyrolysis of flamboyant pods and their functionalization and activation with potassium hydroxide, citric acid, tartaric acid, sulfuric acid, and calcium nitrate. Different routes for the preparation of these catalysts were tested and analyzed where the FAME formation was the target variable to be improved. Results showed that the catalyst prepared with pota
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Alsowayigh, Marwah M., Amal H. Alsehli, Fahad Alqahtani, et al. "Investigation of Calcium Phosphate Catalysts in Sodium Borohydride Methanolysis for Improved Hydrogen Production." Catalysts 14, no. 8 (2024): 512. http://dx.doi.org/10.3390/catal14080512.

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In this study, calcium-rich resource minerals such as brushite, tricalcium phosphate (TCP), and hydroxyapatite were tested as catalysts for the methanolysis of alkaline solutions of NaBH4 to generate hydrogen H2. The synthesis of calcium phosphate compounds was characterized by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The hydrogen generation rate with the TCP catalyst (15,214 mL min−1 g−1) was higher than with the hydroxyapatite catalyst (12,437 mL min−1 g−1) and brushite catalyst (6210 mL min−1 g−1) for the methanolysis of 250 mg NaBH4 at 298 K using 25
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Li, Changqing, Xinyue Cui, Aili Wang, et al. "Direct Synthesis of Calcium Lactate through the Reaction of Glycerol with Calcium Hydroxide Catalyzed by Bimetallic AuCu/SiO2 Nanocatalysts." Catalysts 14, no. 5 (2024): 318. http://dx.doi.org/10.3390/catal14050318.

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Bimetallic AuCu/SiO2 nanosized catalysts were prepared using the wet chemical reduction technique. From among Au0.1–1.5Cu10/SiO2 catalysts, the Au0.5Cu10/SiO2 catalyst gave the highest yield of calcium lactate of 87% at a glycerol conversion of 96% when the reaction of glycerol with calcium hydroxide at a mole ratio of calcium hydroxide to glycerol of 0.8:1 was conducted under an anaerobic atmosphere at 200 °C for 2 h. The interactions between metallic Au0 and Cu0 nanoparticles facilitate calcium lactate formation. The simulation of glycerol consumption rate with an empirical power-function re
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Istadi, Istadi, Udin Mabruro, Bintang Ayu Kalimantini, Luqman Buchori, and Didi Dwi Anggoro. "Reusability and Stability Tests of Calcium Oxide Based Catalyst (K2O/CaO-ZnO) for Transesterification of Soybean Oil to Biodiesel." Bulletin of Chemical Reaction Engineering & Catalysis 11, no. 1 (2016): 34. http://dx.doi.org/10.9767/bcrec.11.1.413.34-39.

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<p>This paper was purposed for testing reusability and stability of calcium oxide-based catalyst (K<sub>2</sub>O/CaO-ZnO) over transesterification reaction of soybean oil with methanol to produce biodiesel. The K<sub>2</sub>O/CaO-ZnO catalyst was synthesized by co-precipitation method of calcium and zinc nitrates followed by impregnation of potassium nitrate. The fresh and used catalysts were tested after regeneration. The catalysts were characterized by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and BET Surface Area in order to compare the catal
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Suprapto, Suprapto, Tikha Reskiani Fauziah, Meiske S. Sangi, Titie Prapti Oetami, Imroatul Qoniah, and Didik Prasetyoko. "Calcium Oxide from Limestone as Solid Base Catalyst in Transesterification of Reutealis trisperma Oil." Indonesian Journal of Chemistry 16, no. 2 (2018): 208. http://dx.doi.org/10.22146/ijc.21165.

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CaO catalysts were synthesized from limestone by thermal decomposition and coprecipitation methods. The CaO and MgO reference catalysts were also synthesized for comparison. The catalysts were characterized by X-ray diffractometer (XRD) and the analysis result was refined by Rietica software. CaO catalyst obtained by coprecipitation method has higher purity of CaO and lower MgO content than those of calcined CaO. The catalysts were also characterized by Fourier Transform Infrared (FTIR) spectroscopy. FTIR spectra showed that the catalysts can be easily hydrated and carbonated in air. The catal
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Resitoglu, Ibrahim Aslan, Ali Keskin, Bugra Karaman, and Himmet Ozarslan. "Suppressing Calcium Deactivation in Selective Catalytic Reduction of NOx from Diesel Engines Using Antimony." Processes 13, no. 6 (2025): 1914. https://doi.org/10.3390/pr13061914.

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The selective catalytic reduction (SCR) of NOx emissions by hydrocarbons (HCs) using a silver (Ag)-based catalyst offers significant advantages over conventional SCR systems that rely on ammonia reductants and vanadium-based catalysts. However, the conversion rate of SCR is influenced by several factors, among which catalyst poisoning is a major concern. Toxic metals such as sodium (Na), potassium (K), magnesium (Mg), and calcium (Ca) can degrade catalyst activity and lead to deactivation. Poisoned catalysts suffer from reduced conversion rates and premature deactivation before reaching their
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Wang, Jian, and Yi Fan Zhang. "The Study of Divalent Metal Ion Catalysts on Phenol-Formaldehyde Resol Resins." Applied Mechanics and Materials 71-78 (July 2011): 818–21. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.818.

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The curing characteristic of phenol-formaldehyde resol resins catalyzed with magnesium hydroxide, calcium hydroxide and barium hydroxide was studied in this study.The effects of catalysts on chemical structure of phenol formaldehyde resin was investigated by fourier transform infrared.The results indicated that divalent metal ions catalysts played an important role influence both the cure rate and cure time.Phenol formaldehyde resin catalysed by diffierent catalysts showed diffierent addition of formaldehyde onto ortho positions of phenolic rings.The order of the divalent metal ions effectiven
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Garbarino, Gabriella, Federico Pugliese, Tullio Cavattoni, Guido Busca, and Paola Costamagna. "A Study on CO2 Methanation and Steam Methane Reforming over Commercial Ni/Calcium Aluminate Catalysts." Energies 13, no. 11 (2020): 2792. http://dx.doi.org/10.3390/en13112792.

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Three Ni-based natural gas steam reforming catalysts, i.e., commercial JM25-4Q and JM57-4Q, and a laboratory-made catalyst (26% Ni on a 5% SiO2–95% Al2O3), are tested in a laboratory reactor, under carbon dioxide methanation and methane steam reforming operating conditions. The laboratory catalyst is more active in both CO2 methanation (equilibrium is reached at 623 K with 100% selectivity) and methane steam reforming (92% hydrogen yield at 890 K) than the two commercial catalysts, likely due to its higher nickel loading. In any case, commercial steam reforming catalysts also show interesting
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Tesis sobre el tema "Calcium catalysts"

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Kröger, V. (Virpi). "Poisoning of automotive exhaust gas catalyst components:the role of phosphorus in the poisoning phenomena." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514286087.

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Abstract The aim of this thesis project was to gain new knowledge on the effect of phosphorus on the catalytic activity and characteristics of automotive exhaust gas catalyst components. The simultaneous roles of phosphorus and calcium were also studied. The first test series of powdery catalyst samples contained Rh and oxide (Test series 1) and the second, Pt and oxide or ZSM-5 (Test series 2). The catalysts were analyzed when fresh and after two ageing and phosphorus poisoning procedures developed in this work. The procedures consisted of adding poison via impregnation in an aqueous solutio
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Kunchithapatham, Kamala. "Development of Calcium and Palladium Catalysts for the Formation of Carbon-Carbon and Carbon-Heteroatom Bonds." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337955731.

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Rêgo, de Vasconcelos Bruna. "Phosphates-based catalysts for synthetic gas (syngas) production using CO2 and CH4." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2016. http://www.theses.fr/2016EMAC0004/document.

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Parmi les produits issus de la biomasse ou de la transformation des déchets organiques, le CO2 et le CH4 sont des intermédiaires chimiques importants qui ont de forts impacts environnementaux. En effet, ils sont les principaux gaz responsables de l'effet de serre et leur atténuation est un enjeu majeur. Une voie intéressante pour la valorisation de ces gaz est le reformage à sec du méthane (DRM), qui convertit le CO2 et le CH4 en gaz de synthèse (mélange d'hydrogène et de monoxyde de carbone). Ce mélange peut être utilisé pour plusieurs applications telles que la production de méthanol, d'éthe
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Borteh, Hassan. "Micropatterning of Functional Inorganic Materials with Benign Chemistry Using Peptide Catalysts." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276883108.

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Song, Hua. "Investigation of Reaction Networks and Active Sites in Bio-ethanol Steam Reforming over Cobalt based Catalysts." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243999804.

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Marin, Lucile. "Réaction d’aza-Piancatelli : nouvelles applications, version diastéréosélective et utilisation en synthèse totale." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS206.

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Grâce à leurs multiples sites de fonctionnalisation, les cyclopenténones sont des intermédiaires particulièrement utiles dans la synthèse de produits naturels d’intérêt thérapeutique. En particulier, les composés 4-aminocyclopenténones permettent l’accès au motif aminocyclopentitol présent dans des molécules bioactives telles que le peramivir, la pactamycine, ou encore la trehazoline. L’une des méthodes les plus efficaces pour accéder aux 4-aminocyclopenténones est la réaction de cyclisation d’aza-Piancatelli. Cette réaction est basée sur le réarrangement de 2-furylcarbinols en présence d’un n
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Ebadi, pour Negisa. "Développement de systèmes catalytiques à base de Ca pour la polymérisation sélective de glycérol." Electronic Thesis or Diss., Centrale Lille Institut, 2021. http://www.theses.fr/2021CLIL0027.

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Bien que de très nombreuses applications soient recensées pour valoriser le glycérol coproduit par la filière biodiesel (à raison de 100 kg de glycérol par tonne de biocarburant), les solutions potentiellement les plus lucratives basées sur des transformations chimiques avancées n’atteignent aujourd’hui que rarement le stade commercial. Ceci est principalement dû à (i) une instabilité réglementaire sur les licences de production de biodiesel menaçant ainsi la disponibilité du glycérol et (ii) un prix du glycérol pouvant par conséquent fluctuer de manière imprévisible. Faire évoluer le concept
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Wixey, James S. "Novel calcium complexes applied to intramolecular hydroamination catalysis." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/37858/.

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This thesis discusses the synthesis, characterisation, and reactivity studies of a range of new chiral calcium complexes supported by various polydentate N-donor ligands and their suitability as catalysts for intramolecular hydroamination. Chapter One outlines the case for developing organocalcium complexes, including a general overview of their current application to a variety of heterofunctionalisation reactions. Chapter Two introduces the chiral ethylene diamines which are extensively used as calcium supporting ligands and later as precursors for the synthesis of bisimidazoline and potentia
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Qi, Chenxiao. "New catalytic tools for the functionalization of alcohols and unactivated alkenes." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS202.

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A l’heure actuelle, il y a une forte demande de l’industrie de la chimie fine pour développer des procédures basées sur des réactions n’impliquant pas l’utilisation de métaux de transition et mettant en jeu des produits de départ facilement accessibles. Les principales raisons sont la disponibilité, le coût et la toxicité des métaux de transition ou des électrophiles. Dans ce contexte, utiliser d’alcools et alcènes pour la formation de liaisons carbone-carbone et carbone-hétéroatome est particulièrement attractif, cependant cela reste encore un challenge, surtout quand les substrats sont extrê
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Espied, Arnaud. "Approches catalytiques innovantes par des acides de Lewis pour la synthèse de composés cycliques, bicycliques et bioisostères du benzène." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF082.

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Nous avons mené des recherches approfondies sur plusieurs réactions innovantes dans le domaine de la synthèse organique. Dans un premier temps, nous avons développé une réaction de cyclisation déshydratante ainsi que deux réactions en tandem, initiées par une cyclisation intramoléculaire. Ces réactions se caractérisent par leur haute diastéréosélectivité et l'utilisation d'un catalyseur à base d'un métal du groupe principal, agissant en tant qu'acide de Lewis. Cette approche nous a permis de synthétiser 27 nouveaux composés cycliques, avec des rendements pouvant atteindre 97 %. Dans un deuxièm
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Capítulos de libros sobre el tema "Calcium catalysts"

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Nigha, Kamaldeep Singh, Shifa Naaz, and Amrit Pal Toor. "Biodiesel Production Using CaO-Based Heterogeneous Catalysts." In Advanced Synthesis and Medical Applications of Calcium Phosphates. CRC Press, 2024. http://dx.doi.org/10.1201/9781003360605-10.

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Patel, Madhumita, K. K. Pant, and Pravakar Mohanty. "Renewable Hydrogen Generation by Steam Reforming of Acetic Acid over Cu-Zn-Ni Supported Calcium Aluminate Catalysts." In ACS Symposium Series. American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1092.ch009.

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Polat, Elif. "Fat Soluble Vitamins and Macrominerals." In Vitamins, Minerals and Trace Elements. Nobel Tip Kitabevleri, 2024. http://dx.doi.org/10.69860/nobel.9786053359173.1.

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The word vitamin was first used to mean ""the amine necessary for life"". • Vitamins are organic catalysts necessary for normal body functions, growth and healthy living. They are not synthesized in the human body and must be obtained externally. Vitamins are classified according to their fat and water solubility. Fat-soluble vitamins are vitamins A, D, E and K, and although they are essential for health, each of them has very important functions in the body. They have many biological activities such as vision, bone, coagulation and antioxidant effects. They are released, absorbed and transpor
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Gupta, Ritu, and Ashiya Khan. "Calcium-Based Waste Material for Catalysis." In Calcium-Based Materials. CRC Press, 2024. http://dx.doi.org/10.1201/9781003360599-9.

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Wang, Ye, and Yasuo Ohtsuka. "Utilization of Carbon Dioxide for Direct, Selective Conversion of Methane to Ethane and Ethylene with Calcium-Based Binary Catalysts." In ACS Symposium Series. American Chemical Society, 2002. http://dx.doi.org/10.1021/bk-2002-0809.ch006.

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Saito, S. "CHAPTER 4. Asymmetric Catalysis with Chiral Magnesium and Calcium Systems." In Catalysis with Earth-abundant Elements. Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781788012775-00081.

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Kouzu, Masato. "Eco-Friendly Production of Biodiesel by Utilizing Solid Base Catalysis of Calcium Oxide for Reaction to Convert Vegetable Oil into Its Methyl Esters." In Zero-Carbon Energy Kyoto 2009. Springer Japan, 2010. http://dx.doi.org/10.1007/978-4-431-99779-5_3.

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Cerón-Ferrusca, Montserrat, Rubi Romero-Romero, Reyna Natividad, and Sandra Luz Martínez-Vargas. "Bifunctional catalysts applied to produce biodiesel from waste cooking oil." In CIERMMI Women in Science Engineering and Technology TXV. ECORFAN, 2021. http://dx.doi.org/10.35429/h.2021.6.20.36.

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This work aims to present the analysis of the catalytic performance of Fe2O3/CaO as a bifunctional catalyst in the production of biodiesel from waste cooking oil. The clamshell was used as a source of calcium oxide by calcination. The catalyst was characterized by Thermogravimetric analysis and Differential scanning calorimetry (TGA-DSC), X-ray diffraction (XRD) and Inductively coupled plasma atomic emission spectroscopy (ICP-AES). The catalytic tests were conducted at 55 °C, the methanol:oil ratio was 12:1, amount of catalyst of 6%wt and reaction time of 5 h. The content of methyl esters in t
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Yamamura, M., H. Okado, N. Tsuzuki, et al. "Natural Calcium Compounds as Catalysts for Oxidative Coupling of Methane." In Studies in Surface Science and Catalysis. Elsevier, 1994. http://dx.doi.org/10.1016/s0167-2991(08)63874-4.

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Zinsmaier, K. E. "Cysteine-string proteins." In Guidebook to Molecular Chaperones and Protein-Folding Catalysts. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198599494.003.0045.

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Abstract Omega-conotoxin receptor or CCCS1 for candidate calcium channel subunit 1 (Mastrogiacomo et al., 1994b), now denoted Tcsp. The Drosophila csp gene was isolated using the antibody MAb DCSP-1 (former Mab ab49) (Zinsmaier et al., 1990, 1994) .The gene (Flybase gene id #Fbgn0004179) is located at 79E1-2 on the third chromosome, expresses three alternatively spliced RNA (2.3-2.9 kb) transcripts (Zinsmaier et al., 1994). The amino acid sequence deduced from the nucleotide sequence of two cDNA clones isolated from a Drosophila head cDNA library (GenBank accession numbers M63421, M63008; Zins
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Actas de conferencias sobre el tema "Calcium catalysts"

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Sikes, C. S., and Andrzej Wierzbicki. "Atomic Force Microscopy and Molecular Modeling of Branched and Unbranched Polyaspartate Bound to Calcite and Mica." In CORROSION 1997. NACE International, 1997. https://doi.org/10.5006/c1997-97166.

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Abstract Polyaspartate molecules made by dry, thermal polycondensation of aspartic acid are thought to be moderately branched. Polyaspartates made by thermal polycondensation in the presence of phosphoric acid as a solvent/catalyst are thought to be linear, unbranched molecules. Examples of these two forms of poly aspartate were synthesized. When viewed by atomic force microscopy (AFM) on mica, the poly aspartates did appear to be different, but there was no evidence for or against the presence of branching as such. When viewed by AFM on calcite, the phosphoric-catalyzed, thermal polyaspmtates
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Korchuganova, Olena, Viktoriya Mokhonko, Eduard Potapenko, Krystyna Kanarova, Anastasiia Novikova, and Rafael Luque. "On Obtaining Nanomaterials from Industrial Waste." In 8th International Congress "Environment Protection. Energy Saving. Sustainable Environmental Management". Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-6vred7.

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A large number of critical raw materials are heavy metals. Heavy metals can be part of industrial waste and used to produce high-quality products. For the processing of industrial waste into nanosized materials, it is proposed to use the following directions: - conversion of waste into products with different quality requirements; - regeneration of waste to restore their consumer properties; - use of waste generated as a by-product of the process to create another product with unique properties. Successful examples of processing are given: spent iron-chromium catalyst into iron oxide pigment,
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Estievenart, C., N. Kohler, F. Ropital, and C. Fiaud. "Polyaspartates: Influence of Synthetic Routes on Scale Inhibition and Biodegradability." In CORROSION 2002. NACE International, 2002. https://doi.org/10.5006/c2002-02412.

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Abstract Calcium carbonate scale deposition is a major problem in industrial cooling systems. In most cases it reduces the overall flow rate, limits thermal exchanges and in some cases may even lead to a complete shutdown of the installations. Various chemical additives have been proposed to inhibit scale deposits. Due to more and more severe ecological constraints, the use of biodegradable inhibitors has some promising prospects. Polyaspartate as a green scale inhibitor can be prepared by different synthetic routes. Preparation conditions influence both scale inhibition efficiency and biodegr
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Shong, David. "Understanding Insulation Chemistry Proven to Inhibit Corrosion under Insulation (CUI)." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-08876.

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Abstract Since 2002, a corrosion inhibiting chemistry package has been an integral part of two specific industrial insulations to actively and continuously inhibit corrosion under insulation (CUI). The package relies on liquid water infiltration as a catalyst to provide a layer of corrosion protection for the life of the insulation. This paper explains, at a molecular level, how this time-tested package, which is integral to domestic calcium silicate and expanded perlite insulations, engages a two-pronged defense (physical coating and pH buffering) against CUI. Included are recent, third-party
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Dumeignil, Franck, Benjamin Katryniok, and Negissa Ebadi Pour. "Glycerol polymerization over stable and selective calcium hydroxyapatite." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/dpka8345.

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High catalytic activity and large availability of Ca-based catalysts make them particulartly attractive for the glycerol polymerization reaction. However, this kind of catalyts usually suffers from a poor stability under the reactions conditions. We present herein the use of Ca-hydroxyapatites (HAps), a very abundant Ca source in the nature, as glycerol polymerization catalysts combining high performance in terms of selectivity and high resistance to deactivation by leaching. We have synthesized, characterized and tested Ca-rich, stochiometric and Ca-deficient HAps. The two latter ones were fu
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Ahmad, Razi, Shamala Ramasamy, Ragunathan Santiagoo, Norhafezah Kasmuri, and Nor Amizah Saede. "Catalytic pyrolysis of biomass using calcium-based catalysts." In PROCEEDINGS OF 8TH INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS ENGINEERING & TECHNOLOGY (ICAMET 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0051556.

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AGNES, Ng Xin Hui. "Catalytic performance of calcium oxide-modified copper- Zinc-alumina catalysts in methanol synthesis from CO2 hydrogenation." In Decarbonization Technology: ICDT2024. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903575-21.

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Abstract. Proposed as a carbon utilization method, the catalytic hydrogenation with carbon dioxide (CO2) as feedstock to produce methanol is a viable approach for utilizing excess CO2 and countering climate change. The current work aims to enhance methanol production from CO2 hydrogenation over a CaO-promoted Cu/ZnO-based catalyst supported on Al2O3. The catalysts, prepared via impregnation method with 10 wt.% active metal loading and 1.0 wt% CaO promoter, were analyzed for physicochemical properties using N2 physical adsorption-desorption and XRD. It was found that the addition of a CaO promo
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Li, Zhongrui, Enkeleda Dervishi, Yang Xu, et al. "Carbon Nanotubes Growth on Calcium Carbonate Supported Molybdenum-Transition Metal Catalysts." In 2008 MRS Fall Meetin. Materials Research Society, 2008. http://dx.doi.org/10.1557/proc-1142-jj05-09.

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NADZIRAH, Azmi. "Comparative study of MCF-supported Ni-Zr and Ni-CaO catalysts for acetylation in biodiesel by-product utilization." In Decarbonization Technology: ICDT2024. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903575-49.

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Abstract. Malaysia's biodiesel production is expanding quickly, and the main by-product produced is surplus crude glycerol, which has limited application in local industries. Based on the current situation, the conversion of glycerol to higher-value products like acetin through acetylation is an attractive alternative. It has been demonstrated by previous research that the optimal temperature, catalyst type, and reaction time for acetylating glycerol are well-known. However, the effect of catalyst synthesis factors like metal loading still has limited research. Therefore, in this study mesostr
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Johari, Siti Aminah Mohd. "Biodiesel production from waste cooking oil in presence of modified waste eggshell catalyst via microwave heating." In Decarbonization Technology: ICDT2024. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903575-11.

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Abstract. This study compares the efficiency of producing biodiesel from waste cooking oil (WCO) utilizing modified eggshell based calcium oxide (CaO) catalysts improved with magnesium-aluminum hydrotalcite to pure eggshell based CaO by microwave-heated transesterification. The study optimized process parameters for a methanol to oil molar ratio of 9:1 at 65°C for 30 minutes, with the goal of enhancing catalyst stability and basicity for effective biodiesel synthesis. The study demonstrated that the eggshell based CaO/Mg-Al catalyst was better in biodiesel yield (89.44%) than the pure eggshell
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Informes sobre el tema "Calcium catalysts"

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Stevens and Olsen. PR-179-12214-R01 CO Sensor Experimental Evaluation for Catalyst Health Monitoring. Pipeline Research Council International, Inc. (PRCI), 2014. http://dx.doi.org/10.55274/r0010827.

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Oxidation catalysts and three-way catalysts can be used to reduce the amount of CO present in engine exhaust. For 2-stroke lean-burn engines, the oxidation catalyst degrades over time be-cause of the buildup of poisons such as sulfur, zinc, phosphorous, and calcium. Three-way cata-lysts used with stoichiometric engines also degrade over time. Emissions analyzers are often used to evaluate the degradation of oxidation catalysts and three-way catalysts, but it can be very time consuming and expensive. Ideally, a simple sensor system would be beneficial for operating companies to determine if the
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Fromm, Hillel, and Joe Poovaiah. Calcium- and Calmodulin-Mediated Regulation of Plant Responses to Stress. United States Department of Agriculture, 1993. http://dx.doi.org/10.32747/1993.7568096.bard.

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We have taken a molecular approach to clone cellular targets of calcium/calmodulin (Ca2+/CaM). A 35S-labeled recombinant CaM was used as a probe to screen various cDNA expression libraries. One of the isolated clones from petunia codes for the enzyme glutamate decarboxylase (GAD) which catalyzes the conversion of glutamate to g-aminobutyric acid (GABA). The activity of plant GAD has been shown to be dramatically enhanced in response to cold and heat shock, anoxia, drought, mechanical manipulations and by exogenous application of the stress phytohormone ABA in wheat roots. We have purified the
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Yalovsky, Shaul, and Julian Schroeder. The function of protein farnesylation in early events of ABA signal transduction in stomatal guard cells of Arabidopsis. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7695873.bard.

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Loss of function mutations in the farnesyltransferase β subunit gene ERA1 (enhanced response to abscisic acid), cause abscisic acid hypersensitivity in seedlings and in guard cells. This results in slowed water loss of plants in response to drought. Farnesyltransferase (PFT) catalyses the attachment of the 15-carbon isoprenoid farnesyl to conserved cysteine residues located in a conserved C-terminal domain designated CaaX box. PFT is a heterodimeric protein comprised of an a and b sununits. The a subunit is shared between PFT and geranylgeranyltransferase-I (PGGTI) which catalyses the attachem
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