Performance Study Of New Green Desulfurization Systems Based On Heteropoly Compounds With Various Configurations

H2S is a colorless gas with a pungent odor and a low olfactory sensitivity.At low levels,it can endanger public health due to its incredibly high flammability,corrosion,and toxicity,which causes acid rain,pipeline corrosion,and other hazards.At the moment,much progress has been achieved in the study of hydrogen sulfide removal.Adsorption,absorption,catalytic oxidation,low temperature distillation,and membrane processes are all popular methods for removing hydrogen sulfide.Polyoxometallate(POM)has a variety of excellent characteristics,including structural stability,unique acidity,oxidation reduction,catalysis,pseudo liquid phase,and so on,and has been increasingly used in the field of hydrogen sulfide removal.Based on this,the hydrogen sulfide removal and regeneration properties of polyacids replaced by various metal atoms and rare earth atoms,as well as functionalized polyacids,were investigated,and the desulfurization mechanism and desulfurization products were analyzed.The following are the primary contents:一、The desulfurization and regeneration properties of Aderson type heteropoly compounds(NH4)3[XMo6O24H6]·7H2O(X=Fe,Co,Ni,Cu)with different transition metals as central atoms were constructed by a simple one-step synthesis method in water.Investigations were done into how the properties were affected by the type of metal atom,temperature,pH,and concentration.It was discovered that altering the core metal atoms could considerably increase the catalytic desulfurization activity.Sulfate and elemental sulfur were discovered to be the final desulfurization products after an analysis of the desulfurization method and its byproducts.二、The synthesis of various rare earth elements as the center of Weakley type polyacid K7H8[LnMo4V6O36](Ln=La,Ce,Pr,Nd)and the influence of temperature,pH,and concentration on desulfurization performance were investigated.Electrochemical regeneration was used to investigate the reuse performance of multi-acid materials,and a series of characterization analyses were used to discuss the desulfurization mechanism and products.S and SO42-were determined to be the final desulfurization products.Heteropoly compounds act as catalysts in the desulfurization process.三、A series of functional and polyacids were synthesized using ionic liquid as a solvent,amino functionalized phosphonitrile group and heteropoly acid anion,and dissolved in ionic liquid to investigate their desulfurization performance.Phosphoritrile groups are lipophilic and easily soluble in non-polar solvents after amino functionalization,and they provide a large number of hydrogen bonding sites with unique catalytic activity.The desulfurization performance has been improved over the simple heteropolyacid-ionic liquid system.Characterization analysis was used to further discuss the mechanism and products of desulfurization.The behavior of the polymer system created by the phosphonitrile ligand and heteropoly acid compounds is still significantly influenced by[PMo11Mn].The enhanced desulfurization performance of the two is the result of the formation of new,more stable,and efficient polymers,rather than a simple addition of each.