A Preliminary Study Of The Two-functional Catalyst For Carbon Dioxide Reforming Coke Oven Gas To Carbon Monoxide

Coke oven gas is a byproduct of the coke plants,in addition to hydrogen-rich,which also contains large amounts of hydrocarbons such as methane.A large number of coke oven gas emissions waste the valuable resources,which also causes environmental pollution at the same time.For this reason,the reasonable value-added coke oven gas has a very important significance.With the rapid development of the global industrial economy and human society activities,especially since the second industrial revolution,fossil fuel consumption in the industrial production and daily life has grown exponentially,resulting in atmospheric C02 increasing number of increase far in excess of photosynthesis-based self-purification capacity of the plants on the environment C02.Therefore,utilization of carbon dioxide is an important task to be solved,and the international resources ecological research in the field is currently one of the hot spots.In this paper,CO2 reforming of coke oven gas to take carbon monoxide,make full use of the greenhouse gases CO2 and CH4 at the same time,the product gas carbon monoxide as the most important carbonyl synthesis feed gas can be produced almost all of the basic organic chemicals,such as methanol,acetic acid,tert-carboxylic acid,phosgene,a carboxylic acid ester,and pesticides such as herbicides.In recent years,the demand for CO as raw material for petrochemical products continues growing.This shows carbon dioxide reforming of coke oven gas production to carbon monoxide is of great significance.Firstly,prepare different loading of single-component catalyst Ni,Cu and Fe,and study their catalytic performance,which combine with the XRD characterization methods.The results indicate that Ni loading is significantly better than 5 wt%to 9 wt%for the Ni catalyst.The XCO2 and SCO of the Ni catalyst loading is 9 wt%can reach 66.79%and 65.87%at 900?,respectively.Add alkaline earth metal oxides CaO and MgO on the basis of this catalyst,which shows the reactivity of adding CaO catalyst is always higher than that of adding MgO catalyst at the same temperature.Based on the characteristic of the present system,the single component of the type for loading of Cu,Fe catalysts are prepared,which make the conclusion that the catalyst loading was 5 wt%displays superior catalytic activity.Secondly,to add different loading of a second active ingredient Cu and Fe on the basis of nickel catalyst loading(9 wt%).Experiments test performance in the modified catalysts under different reaction temperatures,and the results showed that:the reaction performance of the catalyst adding Cu loading 5 wt%achieves the best performance,and the methane and carbon dioxide conversion can reach 99.99%and 75.36%at 900?,respectively,and carbon monoxide selectivity is 85.82%.the spectrum of the fresh catalyst adding 5 wt%Cu is not detected the characteristic peaks of CuO,which indicates CuO is highly dispersed on the support surface.H2-TPR and C02-TPD spectra illustrate basic sites of bifunctional catalyst increased after the addition of Cu,which increases the adsorption capacity of carbon dioxide.adding precious metals additives Ce based on the 9 wt%Ni-5 wt%Cu catalyst shows best catalytic performance,when the methane and carbon dioxide conversion can reach 99.99%and 71.29%at 900 ?,respectively,and carbon monoxide selectivity can be achieved 97.15%.On the whole,adding the second metal component Cu has excellent reaction to the reaction system performance.