Eggshell calcination at 900 °C was used to produce CaO, which was afterward impregnated with K and Sr using KNO and SrCl·6HO precursors, diluted in methanol, to improve basicity, stability, and catalytic activity. The CaO doping with K-Sr affected the final catalyst's textural properties, alkalinity, and basic strength due to the K and Sr size and incorporation into the CaO lattice. SEM images with elemental mapping showed a uniform K and Sr distribution for the K-Sr/CaO catalyst. However, carbonization modified the basic strength and the number of catalytic sites. The fresh K-Sr/CaO and CaO catalysts presented 92.5% and 46% biodiesel yields, respectively. In the third reaction cycle, the biodiesel yield dropped to approximately 72% and 21%, respectively. In this sense, the method of doping CaO with K and Sr increased the basic strength and number of basic sites for the K-Sr/CaO catalyst, providing higher resistance to leaching compared to the CaO catalyst. Finally, the enhanced conditions were 7.0 wt % catalyst loading, a 12.5:1 methanol/oil molar ratio, 70 °C, and a 1 h reaction time.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11866205 | PMC |
| http://dx.doi.org/10.1021/acsomega.4c09118 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Development and comparative analysis of clobetasol-loaded microneedle patches versus clobetasol propionate ointment in experimental induced-psoriasis model.
Int J Pharm
March 2025
Department of Pathology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
The utilization of dissolvable microneedles (MNs) is a promising and cutting-edge approach to drug delivery for the treatment of psoriasis, an autoimmune skin disorder characterized by the appearance of red, scaly patches on the skin. This study presents the development of a dissolving MN patch made of polyvinylpyrrolidone for the purpose of delivering Clobetasol 17-Propionate through the skin. The MN patches were evaluated for their physical characteristics, including morphology, solubility, strength, and ability to penetrate the skin.
View Article and Find Full Text PDFThe Effect of Deep Cryogenic Treatment on the Electrocatalytic Performance of a Pd@CFs Catalyst for Methanol Oxidation.
Nanomaterials (Basel)
February 2025
School of Materials Science and Engineering, Xi'an Key Laboratory of Textile Composites, Xi'an Polytechnic University, Xi'an 710048, China.
To enhance the electrocatalytic performance of a flexible Pd@CFs catalyst for methanol oxidation, deep cryogenic treatment in liquid nitrogen was introduced. The effects of the frequency and time of the deep cryogenic treatment on the surface crystal orientation, microstructure morphology, mechanical performance, and electrocatalytic performance for methanol oxidation were studied. The results showed that when the frequency of the deep cryogenic treatment was 2 times and the deep cryogenic time was 24 h, the electrocatalytic performance of the catalyst was the best.
View Article and Find Full Text PDFDetection of antimicrobial resistance via state-of-the-art technologies versus conventional methods.
Front Microbiol
February 2025
Department of Physiology, Faculty of Medicine, University of Tabuk, Tabuk, Saudi Arabia.
Antimicrobial resistance (AMR) is recognized as one of the foremost global health challenges, complicating the treatment of infectious diseases and contributing to increased morbidity and mortality rates. Traditionally, microbiological culture and susceptibility testing methods, such as disk diffusion and minimum inhibitory concentration (MIC) assays, have been employed to identify AMR bacteria. However, these conventional techniques are often labor intensive and time consuming and lack the requisite sensitivity for the early detection of resistance.
View Article and Find Full Text PDFImaging molecular structures and interactions by enhanced confinement effect in electron microscopy.
Nat Commun
March 2025
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, Jiangsu, China.
Atomic imaging of molecules and intermolecular interactions are of great significance for a deeper understanding of the basic physics and chemistry in various applications, but it is still challenging in electron microscopy due to their thermal mobility and beam sensitivity. Confinement effect and low-dose imaging method may efficiently help us achieve stable high-resolution resolving of molecules and their interactions. Here, we propose a general strategy to image the confined molecules and evaluate the strengths of host-guest interactions in three material systems by low-dose electron microscopy.
View Article and Find Full Text PDFSWOT strategy for future global health security: insights from Indonesia, Cambodia, Vietnam, Dominican Republic, Ghana, and the Republic of Korea using the World Health Organization International Health Regulations monitoring tool.
Osong Public Health Res Perspect
March 2025
Division of International Affairs, Korea Disease Control and Prevention Agency, Cheongju, Republic of Korea.
Article Synopsis
- The study analyzed the health security capacities of six countries (Indonesia, Cambodia, Vietnam, Dominican Republic, Ghana, and South Korea) in implementing WHO International Health Regulations.
- Data was collected from various sources, including health security indices, and a SWOT analysis was conducted to identify strengths, weaknesses, opportunities, and threats affecting health security in these nations.
- Key findings highlighted strong early warning systems and immunization opportunities but also revealed weaknesses in legal frameworks and human resources, as well as threats like biosafety issues and communication challenges during public health emergencies.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!