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《zn-cr催化劑上甲醇氧化重整制氫研究》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、摘要本論文采用不銹鋼微通道反應(yīng)器，首先考察TCr203／ZnO固溶體催化劑對甲醇水汽重整反應(yīng)的催化性能。結(jié)果表明ZnO是其中的活性組分，cr的加入有助于催化劑活性和穩(wěn)定性的提高，這可歸因于ZnCr204固溶體的形成。但Cr的加入導(dǎo)致CO選擇性增加。在浸漬法制備了Zn．Cr催化劑上，考察了甲醇水汽重整、甲醇部分氧化、甲醇氧化重整以及水氣變換等反應(yīng)過程，探討了甲醇水汽重整和氧化重整兩個(gè)過程的獨(dú)立反應(yīng)網(wǎng)絡(luò)。研究表明，甲醇水汽重整過程可以簡單地用甲醇水汽重整和分解兩個(gè)平行反應(yīng)來描述：‰乩100×l0nex，鴿產(chǎn))喘0．8毗66-0。A0lm。l／gcaIhr‰_119l×1
2、0¨exp(蘭鼉$編moJ／gcat．hr甲醇氧化重整包含了甲醇氧化和水汽重整兩個(gè)獨(dú)立過程。低溫下主要是甲醇氧化過程，可用甲醇部分氧化、完全氧化和甲醇分解三個(gè)反應(yīng)簡單描述：POMCOMDMrt=1．135×109xgxp(蘭鼉筍磁-。．439龜O．216m01／刪r一．230×106XCXp(二等)磷妒mol柵hr％_2042×109×exp(毫掣以0．／1H6m。I／gcat．IIr“』而高溫下上述三個(gè)反應(yīng)可以按快速反應(yīng)處理，而且還伴有水汽重整過程SRM嘲鄖ox1015exp(專蘆躲礎(chǔ)3m。1／gcat．nr。M糾勱4×10”exp(二等馬嘿m。J／gear．hr
3、關(guān)鍵詞：甲酵，重整，動(dòng)力學(xué)，zn．cr催化劑，微反應(yīng)器Abs訂actAbstractWeiqiangCao(ChemicalEngineering)DirectedbyProfessorGuangwenChenThecombinedreformingofmethanol(CRM)isoneofthemostpromisingroutesforonboardhydrogenproductionfrommethanolduetoitshighefficiency．Thecurrentinvestigationofhydrogenproductionfrommethano
4、lmainlyfocusesonCu—basedandPal-basedcatalysts．However,theyfilenotsuitable南rhydrogenproductionbecauseCu—basedcatalystsdeactivatequicklyandPd·Zncatalystsaretooexpensive．OurstudiesshowedthattheZn—CrcatalystwasapotentialcatalystforhydrogengenerationbyCRMduetoitshighstabilityandselectivity．
5、ThecatalyticperformanceofasolidsolutionCr20s／ZnOforsteamreformingofmethanol(SRM)wasstudiedinthisthesis，usingamicrochannelreactor．TheresultsshowedthatZnOistheactivesiteandtheadditionofCrpromotedtheactivityandselectivityofthecatalyst，whichcouldbeattributedtotheformationofZnCr204spinel．Ho
6、wever,increasingCrcontentresultedinincreasingCOselectivity．ThereactionnetworksoftheSRMandCRMprocessesOVertheZn—Crcatalystwerefirstascertainedbyinvestigatingpartialoxidationofmethanol(POM)，SRM，CRMandwatergasshift(wGs)andsoon．ThereactionkineticsofSRMandCRMwerethenstudiedusingastainlessst
7、eelmicrochannelreactor,basedonthereactionnetwork．TheresultsindicatedthattheSRMprocessshouldincludetwoindependentoverallreactions，Decompositionofmethanol(DM)andSRM．TheWGSandreverseWGSreactionscouldbeignoredinthereactionnetworkAbstract‰=1,100x10Hexp(i篙竽)聰唰“m01／gcat．hr‰：1．191×1011exp(—-
