Development of MCMv3.1 – Aromatics

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فهرست عناوین اصلی در این پاورپوینت

● Overview
● Development of MCMv3.1 – Aromatics
● MCMv3.1 – Toluene Oxidation
● MCMv3.1 – EXACT Cresol Oxidation
● MCMv3.1 – EXACT Butenedial Oxidation
● MCMv3.1 – EXACT Benzene Oxidation
● MCMv3.1 – EXACT Toluene Oxidation
● MCMv3.1 – Update of Aromatics
● MCMv3.1 – Other updates
● Mechanism Development – MOST
● MOST – Key Oxygenates
● MOST EUPHORE 2005 – Proposal
● MOST EUPHORE 2005 – Model Compounds
● Explicit mechanism construction
● Mechanistic Detail – DVE-1 + OH
● DVE-1– degradation scheme 1 (OH)
● DVE-1– degradation scheme 2 (OH)
● Mechanistic Detail – DVE-1 + O3
● DVE-1– degradation scheme 1 (O3)
● DVE-1– degradation scheme 2 (O3)
● MVE-1– degradation scheme (OH)
● MVE-1– degradation scheme (O3)
● Isopleth Plots
● Future Work
● Update of Photolysis Reactions (1)
● Update of Photolysis Reactions (2)
● Update of Photolysis Reactions (3)
● Update of Photolysis Reactions (4)
● Future Work
● Future Scheme Development
● Cyclohexanes: NAEI Speciation
● Building a Hong Kong (HK) Photochemical model
● Hong Kong Data Set
● Identified missing VOC species
● Suggested VOC for expansion of MCM
● Some possible candidates identified from various emissions inventories

نوع زبان: انگلیسی حجم: 1.5 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 41 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/07 08:32:46

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–, .۱, mcmv۳, ., aromatic, exact, o۳, update, formation, oxidation, new, development,

توجه: این مطلب در تاریخ 2019/06/07 08:32:46 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://mcm.leeds.ac.uk/MCM/presentations/MCMws_Leeds_Dec04_arrmech.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: –, .۱, mcmv۳, ., aromatic, exact, o۳, update, formation, oxidation, new, development,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

andrew rickard claire bloss mike jenkin sam saunders and mike pilling gas phase mcm development university of leeds department of chemistry overview update to mcmv۳.۱ aromatic chemistry new schemes mbo development of new schemes most ethylene glycol di vinyl ether dve ۱ ethylene glycol mono vinyl ether mve ۱ most euphore ۲ ۵ photo smog experiments future work update of photolysis rate parameters future scheme developments open for discussion uwa hong kong australian emissions – chloro benzenes biogenics terpenes cyclohexanes cycloalkenes development of mcmv۳.۱ aromatics total aromatics form a significant fraction of anthropogenic voc – from vehicle emissions and solvent use highly reactive compounds with high emissions – substantial contribution to ozone formation degradation schemes for ۴ aromatics benzene toluene p xylene and ۱ ۳ ۵ trimenthylbenzene have been updated on the basis of new kinetic and mechanistic data performance of these mechanisms evaluated using detailed photo smog chamber data from the eu exact campaigns heavily instrumented ۲ m۳ teflon foil chamber long path ftir – aromatic parent compound o۳ hcho hno۳ uv absorption – o۳ doas – no۲ glyoxal chemiluminescence – no lif – oh ho۲ filter radiometer – j no۲ gc techniques hplc co monitor exact database contains photochemical smog chamber studies on all four mono aromatics. other experiments on specific key areas of aromatic oxidation focusing on subsets of the toluene system. where appropriate results from exact have been used to refine the mechanisms. this development work on mono aromatics has been extended to update the degradation schemes of the ۱۲ other mono aromatics with saturated alkyl side chains in mcmv۳.۱. development of mcmv۳.۱ exact key areas in which the aromatic mechanisms have changed are lower benzaldehyde yield in the toluene system. updated photolysis rates of unsaturated γ–dicarbonyls ring opening products . breakdown of ۵h furan ۲ one photolysis product of butenedial has been updated and β–angelica lactone has been replaced by α–angelica lactone to reduce secondary glyoxal formation. new phenol type chemistry has been implemented reflecting lower yield for ring opening channel and need for reduced ozone formation from evaluation against exact euphore cresol smog chamber experiments. primary aromatic oxidation branching ratios have been adjusted to reflect new reported yields of glyoxal and phenol type compounds under atmospheric conditions . mcmv۳.۱ – update of aromatics mcmv۳.۱ – toluene oxidation mcmv۳.۱ – exact cresol oxidation peak o۳ is well simulated with mcmv۳.۱ representation of no and no۲ profiles is improved however radical yield is too low as rate of cresol oxidation is underestimated results from comparison with exact cresol experiments used to adjust hydroxyarene degradation in mcmv۳.۱ in mcm۳.۱a first generation ring retained products are treated in the same way as the original cresol mcmv۳.۱ – exact butenedial oxidation faster removal due to increased photolysis rate in mcmv۳.۱ however oh and ho۲ are much lower than measured noxy chemistry poorly understood secondary peak due to formation of pan ozone simulated well coincidence mcmv۳.۱ – exact benzene oxidation o۳ peak again greatly reduced using mcmv۳.۱ good agreement due to increase in phenol yield however increase in ring retaining products leads to a decrease in oxidising capacity of the system oh better simulated using mcmv۳ this is indicative of the general mechanistic problem over prediction of o۳ but under prediction of the system reactivity. mcmv۳.۱ – exact toluene oxidation o۳ peak still greatly overestimated using mcmv۳.۱ increased branching for ring open products early increased photolysis of unsat. dicarbonyls early changes in phenol chemistry decreases o۳ formation in middle of experiment higher missing oh for mcmv۳.۱ reduced oxidative capacity consistent with reduced o۳ formation potential mcmv۳.۱ – update of aromatics in general mcmv۳.۱ shows improved ability to simulate some of the exact observations and represents our current understanding of aromatic degradation. however significant discrepancies remain concerning ozone formation potential and oxidative capacity of aromatic hydrocarbon systems peak o۳ is simulated well for benzene but over estimated for the substituted aromatics. oh radical production is too low to account for the oh inferred from the rate of loss of the parent aromatic. for a majority of the systems the no oxidation rate is under predicted. this parameter is linked to the production of o۳ and the oxidative capacity of the system. ideas and strategies for resolving these issues have been suggested and additional laboratory and smog chamber experiments are required in order to investigate them further. mcmv۳.۱ – other updates new scheme for biogenic hydrocarbon mbo ۲ methyl ۳ buten ۲ ol added with ۹۳ new reactions ۳ new species all major new products already in mcm extended list of chloro and hydrochlorocarbons and ۲ hydrobromocarbons mcmv۳.۱ now contains ۱۳۵ primary emitted vocs c.a. ۵۶ species and ۱۳۵ reactions mechanism development – most multiphase chemistry of oxygenated species in the troposphere mechanism development – most multiphase chemistry of oxygenated species in the troposphere organic solvents are used in a large number of industrial processes and due to their volatility many are emitted either directly or indirectly into the atmosphere. a number of organic compounds employed as solvents at the present time have been shown to have adverse health effects carcinogenic mutagenic and reprotoxic properties solvents also undergo complex chemical reactions in the atmosphere which lead to the formation of compounds which are environmentally damaging in particular the formation of …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: –, .۱, mcmv۳, ., aromatic, exact, o۳, update, formation, oxidation, new, development,

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http://mcm.leeds.ac.uk/MCM/presentations/MCMws_Leeds_Dec04_arrmech.ppt

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