The Preparation Of Porphyrin Compounds And The Study Of Their Catalytic Performance On The Synthesis Of Propylene Carbonate Using Carbon Dioxide

As we all know, carbon dioxide which was generated by the burning of fossil fuels isthe main cause of greenhouse effect, but at the same time, it is a C1energy whose natureis stable. Therefore, utilizing this C1energy sources which is extensive in the world, easyto obtain is becoming urgent and meaningful. Developing a new kind of catalyst which iseffective and environmental to achieve the fixation of carbon dioxide and the synthesis ofuseful chemical raw material is fit with the idea of green chemistry, one of the mostimportant application in this field is the synthesis of propylene carbonate. Propylenecarbonate can be used in the related field such as electrolyte and apolar aprotic solvent andas one of the useful polymer materials, its polymer has been widely used in motor,electronic and communication because of their stable physico-chemical property.Currently, good progress has been made on the research of propylene carbonate, butthe current catalyst all suffer from harsh reaction conditions and complex recovery process.In order to solve this problem effectively, we choose metalloporphyrin as our catalyst and13X molecular sieve which has a better adsorption capacity of carbon dioxide as oursupport, then developing a new kind catalyst and studying their performance.Firstly, we simplify the synthesis process of catalysts on the basis of original researchto enlarge their production and shorten their preparation period and synthetize differentkinds of metalloporphyrins. We use different characterization methods such as XRD、UV-vis、FT-IR、BET to confirm the successfully synthesis of catalyst.Secondly, we have a research on the performance of different metalloporphyrinscombined with different co-catalyst such as PTAT and DMAP in the cycloadditionreaction of PO and carbon dioxide. Furthermore, we optimize the reaction conditions inthe lab, that is: Co(Cl)TPP as catalyst,PTAT as co-catalyst, npo:ncat:nco-catis900:1:2, thecarbon dioxide was filled in the reactor by one time and the initial pressure was3MPa,react at30℃for3h. The conversion ratio of PO is88.90%, the yields ratio of PC is86.35%In order to achieve the cycle collection of our catalyst, we choose NaX zeolite whichhas a better adsorption capacity of carbon dioxide as support. After that, we have anoptimization of the reaction conditions catalyzed by supported catalyst and the bestconditions is: the supported Co(Cl)TPP as catalyst, PTAT as co-catalyst, npo:ncat:nco-catis900:1:2, the carbon dioxide was filled in the reactor all the time and the pressure was2MPa, react at120℃for5h. At last, the conversion ratio of PO is94.56%, the yields ratio of PC is90.42%.Finally, we study the reutilization of Mn(Cl)TPP/NaX and Co(Cl)TPP/NaX. After thereaction of5times, the results indicate the catalytic performance of Mn(Cl)TPP/NaX andCo(Cl)TPP/NaX do not have a significant drop.