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Influence Factors on Photochemical Production of methyl iodide in Seawater

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Journal of Ocean University of China 2020年第6期19卷 1353-1361页

作者： CHEN Yan LIU Shanshan YANG Guipeng HE Zhen Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Institute of Marine Chemistry Ocean University of ChinaQingdao 266100China

methyl iodide(CH3I)is an important trace greenhouse gas in the atmosphere and an ozone-depleting *** influence of different environmental factors,such as the duration of illumination;the strength of illumination;the concentrations of humic acid,ferric ion(Fe^3+),and iodide ion(I−);and pH,on the photochemical production of CH3I in artificial seawater(ASW)were tested by simulated solar *** addition,Yangtze River Estuary waters from inshore to offshore were used to explore the relationship between the photochemical production of CH3I and different sources of dissolved organic matter(DOM)in natural seawater(NSW).The results revealed that higher concentrations of humic acid and I−,as well as higher strengths of illumination and longer illumination durations,promoted the photochemical formation of CH3I in *** addition of Fe^3+accelerated the photochemical production of CH3I,but high concentrations of Fe^3+inhibited the formation of *** on NSW obtained from the Yangtze River estuary spiked when concentrations of DOM were high,confirming that DOM plays an important role in facilitating the photochemical production of CH3I within the Yangtze River *** photochemical production of CH3I in the seawater was significantly higher under light conditions relative to dark conditions,indicating that illumination accelerated the production of CH3I.

关键词： methyl iodide photochemical production Yangtze River Estuary dissolved organic matter

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STUDIES OF TPSR AND PULSE REACTION OF methyl iodide ON SILICA-SUPPORTED NOBLE METAL CATALYSTS

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Journal of Energy Chemistry 1996年第3期 250-260页

作者： YAN Zi-Feng(Department of Chemical Engineering, University of Petroleum Dongying, Shandong 257062)XUE Jin-Zhen SHEN Shi-Kong (State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics, The Chinese Academy of Sci

Adsorption of methyl iodide on silica-supported noble metalcatalysts led to the formation of partially dehydrogenated CHx species,whichbecame indistinguishable from CHx groups derived from the decompositionof *** methyl iodide was tentatively used as the surface probemolecule which is usually used in CO hydrogenation. The effects of methyliodide adsorption and features of the surface carbonaceous species wereextensively studied by means of temperature programmed surface reaction(TPSR) and pulse reaction techniques. It showcd that the introduction ofprobe molecule is rather useful for the understanding of the nature ofmethane adsorption and reaction on transition metal catalysts.

关键词： surface probe molecule methyl iodide adsorption and reaction of methyl iodide and methane supported noble metal catalysts

Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide Catalyzed by Potassium Hydroxide under Mild Conditions

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Chinese Chemical Letters 2005年第9期16卷 1267-1270页

作者： Hong WANG Bin LU Qing Hai CAI Feng WU Yong Kui SHAN College of Chemical and Environmental Engineering Harbin University of Science and Technology Harbin 150080 Department of Chemistry Harbin Normal university Harbin 150080 Department of Chemistry East China Normal University Shanghai 200062

The synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide using potassium hydroxide as catalyst in the presence of CH3I and the effect of ionic liquid on the reaction were investigated. The results showed that KOH is an effective catalyst; the high selectivity and raised yield of DMC formation under mild conditions were achieved. However, the addition of the ionic liquid, l-ethyl-3-methylimidazolium bromide （emimBr）, can evidently accelerate the conversion of methanol and yield of the product.

关键词： Dimethyl carbonate methanol carbon dioxide methyl iodide ionic liquid l-ethyl-3-methylimidazolium bromide

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Photofragment translational spectroscopy at 304 nm from C-H symmetric stretch excited CH_3I [v_1 = 1]

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Science China Chemistry 2014年第6期57卷 902-910页

作者： ZHOU ZhiMin HU LiLi DONG ChangWu ZHANG LiJuan LIU Sheng DU YiKui CHENG Min ZHU QiHe National Laboratory of Molecular Sciences State Key Laboratory of Molecular Reaction Dynamics Institute of Chemistry Chinese Academy of Sciences

The 304 nm photodissociation of the C-H symmetric stretch excited CH3I[v1=1,v2=0](v1 denotes the C-H symmetric stretch mode,and v2 denotes the umbrella mode)is studied with our simple photofragment translational *** IR laser is used to excite the ground state CH3I[0,0]to the C-H symmetric stretch excited CH3I[1,0].With IR laser OFF and ON,the fractions of photofragments CH3(ν1,ν2)from the 304 nm photodissociation of CH3I[1,0]have been determined through the photofragment translational spectra(PTS)from measuring I and I*and also through the PTS from measuring CH3(0,0)(1,0)(0,1)and(1,1).The experimental results show that the C-H symmetric stretch vibration(v1=1)in parent molecules is about 66%retained in the photofragments in the I channel,but only 24%in the I**** populations of photofragments CH3(0,2)and(0,3)are higher than CH3(0,0)and(0,1),showing strong inverted population both in I and I*channels.

关键词： photodissociation methyl iodide excited vibrational state photofragment translational spectrum(PTS)

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A Study of the Thermal Decomposition of CH3131I in a Gas Flow in the Presence of “Fizkhmin”TM Granulated Materials

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Journal of Applied Mathematics and Physics 2016年第8期4卷 1522-1527页

作者： Alexey A. Bessonov Sergey A. Kulyukhin Lubov V. Mizina Igor A. Rumer Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences Moscow Russia

Thermal decomposition of a volatile organic compound of radioactive iodine, methyl iodide CH3131I, in a gas flow in the presence of various modifications of “Fizkhmin”TM granulated materials based on silica gel impregnated with d-elements was studied. Under comparable experimental conditions, 97% - 99% decomposition of CH3131I is achieved at ~770?C without sorbents and at ~540?C and ~465?C in the presence of straight silica gel and of the material based on it, impregnated with compounds of Ni or its mixture with Cu (8 - 10 wt%), respectively.

关键词： Iodine-131 Trapping methyl iodide Thermal Decomposition Sorption