Photo and electronic excitation for low temperature catalysis over metal nanoparticles using an organic semiconductor

RSC Advances ◽  
2014 ◽  
Vol 4 (88) ◽  
pp. 47488-47496 ◽  
Author(s):  
Weiran Zheng ◽  
Simon Jones ◽  
Xinlin Hong ◽  
Shik Chi Edman Tsang
Keyword(s):  
Volatile Organic Compounds ◽  
Low Temperature ◽  
Organic Compounds ◽  
Organic Semiconductor ◽  
Electronic Excitation ◽  
Elevated Temperatures ◽  
Environmental Concerns ◽  
Supported Metal Catalysts ◽  
Wide Range ◽  
Volatile Organic

Simple supported metal catalysts are active for the destruction of a wide range of hazardous chemicals of environmental concerns, including CO, N2O and volatile organic compounds (VOCs), in air at elevated temperatures.

scholarly journals Catalytic Abatement of Volatile Organic Compounds and Soot over Manganese Oxide Catalysts

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4534
Author(s):  
Miguel Jose Marin Figueredo ◽  
Clarissa Cocuzza ◽  
Samir Bensaid ◽  
Debora Fino ◽  
Marco Piumetti ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Low Temperature ◽  
Manganese Oxide ◽  
Organic Compounds ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
X Ray ◽  
Manganese Oxide Catalysts ◽  
Volatile Organic ◽  
Temperature Programmed

A set of manganese oxide catalysts was synthesized via two preparation techniques: solution combustion synthesis (Mn3O4/Mn2O3-SCS and Mn2O3-SCS) and sol-gel synthesis (Mn2O3-SG550 and Mn2O3-SG650). The physicochemical properties of the catalysts were studied by means of N2-physisorption at −196 °C, X-ray powder diffraction, H2 temperature-programmed reduction (H2-TPR), soot-TPR, X-ray photoelectron spectroscopy (XPS) and field-emission scanning electron microscopy (FESEM). The high catalytic performance of the catalysts was verified in the oxidation of Volatile Organic Compounds (VOC) probe molecules (ethene and propene) and carbon soot in a temperature-programmed oxidation setup. The best catalytic performances in soot abatement were observed for the Mn2O3-SG550 and the Mn3O4/Mn2O3-SCS catalysts. The catalytic activity in VOC total oxidation was effectively correlated to the enhanced low-temperature reducibility of the catalysts and the abundant surface Oα-species. Likewise, low-temperature oxidation of soot in tight contact occurred over the Mn2O3-SG550 catalyst and was attributed to high amounts of surface Oα-species and better surface reducibility. For the soot oxidation in loose contact, the improved catalytic performance of the Mn3O4/Mn2O3-SCS catalyst was attributed to the beneficial effects of both the morphological structure that—like a filter—enhanced the capture of soot particles and to a probable high amount of surface acid-sites, which is characteristic of Mn3O4 catalysts.

scholarly journals Mapping Asian anthropogenic emissions of non-methane volatile organic compounds to multiple chemical mechanisms

2013 ◽  
Vol 13 (12) ◽  
pp. 32649-32701 ◽  
Author(s):  
M. Li ◽  
Q. Zhang ◽  
D. G. Streets ◽  
K. B. He ◽  
Y. F. Cheng ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Individual Species ◽  
Chemical Mechanisms ◽  
Mixing Ratios ◽  
Wide Range ◽  
Oxygenated Volatile Organic Compounds ◽  
Volatile Organic ◽  
Species Mapping ◽  
Multiple Chemical

Abstract. An accurate speciation mapping of non-methane volatile organic compounds (NMVOC) emissions has an important impact on the performance of chemical transport models (CTMs) in simulating ozone mixing ratios and secondary organic aerosols. In this work, we developed an improved speciation framework to generate model-ready anthropogenic Asian NMVOC emissions for various gas-phase chemical mechanisms commonly used in CTMs by using an explicit assignment approach and updated NMVOC profiles, based on the total NMVOC emissions in the INTEX-B Asian inventory for the year 2006. NMVOC profiles were selected and aggregated from a wide range of new measurements and the SPECIATE database. To reduce potential uncertainty from individual measurements, composite profiles were developed by grouping and averaging source profiles from the same category. The fractions of oxygenated volatile organic compounds (OVOC) were corrected during the compositing process for those profiles which used improper sampling and analyzing methods. Emissions of individual species were then lumped into species in different chemical mechanisms used in CTMs by applying mechanism-dependent species mapping tables, which overcomes the weakness of inaccurate mapping in previous studies. Gridded emissions for eight chemical mechanisms are developed at 30 min × 30 min resolution using various spatial proxies and are provided through the website: http://mic.greenresource.cn/intex-b2006. Emission estimates for individual NMVOC species differ between one and three orders of magnitude for some species when different sets of profiles are used, indicating that source profile is the most important source of uncertainties of individual species emissions. However, those differences are diminished in lumped species as a result of the lumping in the chemical mechanisms.

A wide range sensor of a 3D mesoporous silica coated QCM electrodes for the detection of volatile organic compounds

2019 ◽  
Vol 26 (6) ◽  
pp. 1731-1741 ◽  
Author(s):  
Mohamad M. Ayad ◽  
Nagy L. Torad ◽  
Islam M. Minisy ◽  
Raja Izriq ◽  
El-Zeiny M. Ebeid
Keyword(s):  
Volatile Organic Compounds ◽  
Mesoporous Silica ◽  
Organic Compounds ◽  
Range Sensor ◽  
Wide Range ◽  
Volatile Organic

Low-temperature plasma ionization source for the online detection of indoor volatile organic compounds

Talanta ◽  
2011 ◽  
Vol 85 (5) ◽  
pp. 2458-2462 ◽  
Author(s):  
Xiaoyun Gong ◽  
Xingchuang Xiong ◽  
Yue’e peng ◽  
Chengdui Yang ◽  
Sichun Zhang ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Low Temperature ◽  
Organic Compounds ◽  
Low Temperature Plasma ◽  
Online Detection ◽  
Ionization Source ◽  
Temperature Plasma ◽  
Plasma Ionization ◽  
Volatile Organic

Volatile organic compounds in barite-hosted fluid inclusions from the 3.5 Ga old Dresser Formation, Western Australia

2020 ◽  
Author(s):  
Volker Thiel ◽  
Jan-Peter Duda ◽  
Alfons M. van den Kerkhof ◽  
Joachim Reitner ◽  
Helge Mißbach
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Western Australia ◽  
Fluid Inclusions ◽  
Carbon Fixation ◽  
Solid Phase ◽  
Inorganic Compounds ◽  
Wide Range ◽  
Volatile Organic ◽  
Artefact Formation

<p>The c. 3.5 Ga Dresser Formation of the East Pilbara Craton (Western Australia) contains large amounts of blackish barite. These rocks produce an intense sulfidic odor when crushed, resulting from abundant primary fluid inclusions. In part, the black barites are interbedded with sulfidic stromatolites. Using Raman spectroscopy, microthermometry, and two different online GC–MS approaches, we characterized in detail the chemical composition of the barite-hosted fluid inclusions. Our GC–MS techniques were based on (i) thermodecrepitation at 150-250°C and (ii) solid phase microextraction (SPME)–GC–MS at reduced temperature (50°C), thereby minimizing external contamination and artefact formation. Major fluid inclusion classes yielded mainly H<sub>2</sub>O, CO<sub>2</sub>, and H<sub>2</sub>S in varying abundance, along with minor amounts of COS and  CS<sub>2</sub>, N<sub>2</sub>, and CH<sub>4</sub> (< 1%). Notably, we also detected a wide range of volatile organic compounds, including short–chain ketones and aldehydes, thiophenes, and various organic (poly)sulfides. Some of these compounds (CH<sub>3</sub>SH, acetic acid) have previously been invoked as initials agents for carbon fixation under primordial conditions, but up to now their presence had not been observed in Precambrian materials. Based on our findings, we hypothesize that hydrothermal seepage of organic and inorganic compounds during Dresser times provided both, catabolic and anabolic substrates for early microbial metabolisms.</p>

scholarly journals Integrated Volatile Metabolomics and Transcriptomics Analyses Reveal the Influence of Infection TuMV to Volatile Organic Compounds in Brassica rapa

Horticulturae ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 57
Author(s):  
Xinxin Lu ◽  
Lei Zhang ◽  
Wenyue Huang ◽  
Shujiang Zhang ◽  
Shifan Zhang ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Brassica Rapa ◽  
Differentially Expressed ◽  
Cell Enlargement ◽  
Metabolome Analysis ◽  
Shoot Initiation ◽  
Wide Range ◽  
Volatile Organic ◽  
Transcriptome Analyses

Turnip mosaic virus (TuMV), which is distributed almost all over the world and has a wide range of hosts, mainly brassica crops, was first described in Brassica rapa in the USA. Plant volatile compounds play an important role in the host searching behavior of natural enemies of herbivorous insects. In this study, TuMV-inoculated resistant and susceptible B. rapa lines were tested using volatile metabolome and transcriptome analyses. In volatile metabolome analysis, the volatile organic compounds (VOCs) were different after inoculation with TuMV in resistant B80124 and susceptible B80461, and the degree of downregulation of differentially expressed metabolites was more obvious than the degree of upregulation. Through transcriptome analysis, 70% of differentially expressed genes were in biological process, especially focusing on defense response, flavonoid biosynthetic process, and toxin metabolic process, which indicates that TuMV stress maybe accelerate the increase of VOCs. Integrating the metabolome and transcriptome analyses, after inoculating with TuMV, auxin regulation was upregulated, and ARF, IAA and GH3 were also upregulated, which accelerated cell enlargement and plant growth in tryptophan metabolism. The different genes in zeatin biosynthesis pathways were downregulated, which reduced cell division and shoot initiation. However, the metabolite pathways showed upregulation in brassinosteroid biosynthesis and α-linolenic acid metabolism, which could cause cell enlargement and a stress response. This study determined the difference in volatiles between normal plants and infected plants and may lay a foundation for anti-TuMV research in B. rapa.

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