Industrial low-temperature methane combustion catalyst Pd/AlO suffers from HO-induced deactivation. It is imperative to design Pd catalysts free from this deactivation and with high atomic efficiency. Using a small-pore zeolite SSZ-13 as support, herein we report well-defined Pd catalysts with dominant active species as finely dispersed Pd cations, uniform PdO particles embedded inside the zeolite framework, or PdO particles decorating the zeolite external surface. Through detailed reaction kinetics and spectroscopic and microscopic studies, we show that finely dispersed sites are much less active than PdO nanoparticles. We further demonstrate that HO-induced deactivation can be readily circumvented by using zeolite supports with high Si/Al ratios. Finally, we provide a few rational catalyst design suggestions for methane oxidation based on the new knowledge learned in this study.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8395651 | PMC |
| http://dx.doi.org/10.1021/jacsau.0c00109 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Monitoring the trends of carbon monoxide and tropospheric formaldehyde in Edo State using Sentinel-5P and Google Earth Engine from 2018 to 2023.
Environ Monit Assess
January 2025
Laboratory for Ecotoxicology and Environmental Forensics, University of Benin, PMB 1154, Benin City, Nigeria.
This research was carried out to assess the concentrations of carbon monoxide (CO) and formaldehyde (HCHO) in Edo State, Southern Nigeria, using remote sensing data. A secondary data collection method was used for the assessment, and the levels of CO and HCHO were extracted annually from Google Earth Engine using information from Sentinel-5-P satellite data (COPERNISCUS/S5P/NRTI/L3_) and processed using ArcMap, Google Earth Engine, and Microsoft Excel to determine the levels of CO and HCHO in the study area from 2018 to 2023. The geometry of the study location is highlighted, saved and run, and a raster imagery file of the study area is generated after the task has been completed with a 'projection and extent' in the Geographic Tagged Image File Format (.
View Article and Find Full Text PDFSimulation study on catalytic oxidation of low concentration mine gas in an oxidation device.
Sci Rep
January 2025
Safety Technology Center of Guizhou Coal Mine Safety Supervision Bureau, Guiyang, 550081, Guizhou, China.
Anthropogenic emissions of non-CO greenhouse gases, such as low-concentration coal mine methane (cCH < 30 vol%), have a significant impact on global warming. The main component of coal mine methane is methane (CH), which is both a greenhouse gas and a high-quality clean energy gas. To study the combustion and heat transfer reactions of low-concentration coal mine methane in a catalytic oxidation device, a numerical simulation approach was employed to establish a model of the catalytic oxidation device that includes periodic boundary conditions, methane combustion mechanisms, and turbulent-laminar flow characteristics.
View Article and Find Full Text PDFInvestigation of combustion characteristics of critical quenching hydrogen mixing ratios in the presence of ordered porous media.
Sci Rep
December 2024
College of Safety Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China.
In order to promote low-carbon sustainable development in the ecological environment and improve the efficiency of hydrogen and natural gas energy utilization, this project carried out research on the explosive effects of different thicknesses of ordered porous media on the hydrogen-methane gas mixture. A detailed discussion was conducted based on the critical quenching hydrogen blending ratio under the thicknesses of 50 mm and 60 mm of ordered porous media. The results indicate that the critical quenching hydrogen blending ratio is 9% for a thickness of 50 mm and 20% for a thickness of 60 mm, indicating that greater thickness enhances flame suppression capabilities.
View Article and Find Full Text PDFCombustion versus Gasification in Power- and Biomass-to-X Processes: An Exergetic Analysis.
ACS Omega
December 2024
Department of Chemical Engineering, KU Leuven, 3001 Leuven, Belgium.
Residual biomass is a promising carbon feedstock for the production of electricity-based organic chemicals and fuels since, unlike carbon dioxide captured from point sources or air, it also has a valuable energy input. Biomass can be converted into an intermediate stream suitable for Power-to-X processes mainly via combustion or gasification. Such combined processes are generally called biohybrid or Power- and Biomass-to-X processes.
View Article and Find Full Text PDFInvestigation of NO emission characteristics from co-combustion of methane and ammonia at high-altitude areas.
J Hazard Mater
December 2024
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China; State Key Laboratory of Low-carbon Thermal Power Generation Technology and Equipment, Harbin, Heilongjiang 150001, China; National innovation Platform for Industry-Education Integration of Energy Storage Technology, Harbin Institute of technology, Harbin, Heilongjiang 150001, China.
Article Synopsis
- High-altitude regions in China have a potential for renewable energy and ammonia production, leading to a proposed co-combustion strategy of methane and ammonia to lower carbon emissions.
- A specialized combustion system was used to test how different ammonia mixing ratios, equivalence ratios, and pressures affect nitrogen oxide (NO) emissions in flames fueled by methane and ammonia.
- Findings show that higher ammonia ratios increase NO emissions in stoichiometric flames but remain constant in fuel-rich flames at ratios above 10%. Sub-atmospheric pressure raises NO levels, especially in fuel-rich conditions, but doesn't significantly change nitrogen conversion pathways.
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!