Study On Application Of Modified MOR Molecular Sieve In DMTM Process And Treatment Of 4-Nitrophenol In Water

This article mainly explores two applications of mordenite molecular sieves in the field of energy and environment.In the field of energy,the use of shale gas methane has always been a problem.Due to its flammable and explosive nature,it is difficult to achieve long-distance transportation.Methanol is considered to be an ideal product for methane conversion due to its wide industrial use and good stability How to realize the direct conversion of methane to methanol at the place of production has always attracted much attention.4-Nitrophenol is an organic substance that is difficult to be degraded and highly toxic in wastewater.How to quickly and efficiently degrade 4-nitrophenol in water is also a hot issue in the environmental field.MOR molecular sieve has been proved to be an excellent catalyst due to its stable structure,abundant pores,and acid and alkali resistance.The direct conversion process of methane to methanol(DMTM)has obvious advantages over other methods of methane conversion to methanol.DMTM can ensure high conversion of methane and high selectivity of methanol at the same time.Can be applied to industrial production.Therefore,the choice of catalyst is particularly critical.In this paper,different copper salt-exchanged MOR molecular sieves were used as catalysts in the DMTM process.The evaluation process first obtained 450 ° C as the optimal activation temperature of the catalyst.The yield was as high as 131 ?mol / g,and the selectivity of methanol reached 85% to 90%.At the same time,after comparing the catalytic effects of different copper salt exchange catalysts,it was found that the performance of Cu @ MOR catalysts is affected by the anions in copper salts.The ability of anions to extract protons in MOR and the hydrolysis state of copper ions in aqueous solutions will affect Cu @ MOR Catalyst performance.It can be found from the change in the number of catalyst ion exchanges that the loading state of copper salts is also an important factor affecting the catalytic effect.4-Nitrophenol,as one of the important pollutants in water,can cause eutrophication of water and harm human health through biological enrichment.The Ag @ MOR catalyst prepared by exchanging MOR molecular sieves with silver ions in this paper has obvious treatment effect on 4-nitrophenol in water.All samples can be completely reduced to 4-aminophenol in 20 minutes.Using the concentration of 4-nitrophenol at five minutes as the standard,after comparing the catalytic effects of the catalysts with different silver ion exchange times and exchange times,it was found that as the silver ion concentration increased during the exchange process,the reduction rate accelerated,and the reduction rate of the catalyst was also The number of silver ion exchanges showed a positive correlation trend,and the characterization of the catalyst confirmed this conclusion.