Study On Catalytic Gasification Characteristics Of Copper Slag Based On Long-chain Components Of Rubber Seed Oil

In order to take advantage of biomass fuel oil which has low ash content and high calorific value,combining the high temperature and catalytic performance of copper slag with biomass fuel oil gasification for synthesis gas production.oleic acid was selected as the model compound of biomass fuel oil.Characteristics of catalytic gasification of biomass fuel under CO₂ and air atmosphere was studied.In order to study the characteristics of the catalytic performance of copper slag when material was oleic acid,fixed bed was carried as catalytic gasification experiment installation.And the changes of spent catalyst were analyzed by XRD,EPMA,XPS and Raman spectroscopy.Research indicates:（1）For air gasification experiments,discussing the catalytic gasification effect of copper slag with temperature as a variable can conclude that copper slag as an ore catalyst can improve carbon conversion.This ability comes from two aspects:promotion the oil decomposition products decompose and reduce carbon deposits;at the same gasification temperature,H₂ and CO production are higher than the blank experiment.Under the blank experimental conditions,the highest carbon conversion rate was 39.8%while with copper slag addition carbon conversion rate increased to 46.8%.Increasing the reaction temperature is conducive to the reaction between copper slag and carbon deposit.In this experiment,the best gasification temperature conditions with the highest CO output,H₂ output,and carbon conversion rate are 1100℃.Although reducing the equivalence ratio can improve the carbon conversion rate,but when the equivalence ratio is less than 4.5 too much air will trigger more complete combustion of oleic acid,pyrolysis gas,and coke which will reduce the production of H₂ and CO.When the equivalent ratio is 4.5,the carbon conversion rate reaches a maximum value of 49.3%%.And the CO production and H₂ production also reach the maximum when the equivalent ratio is 4.5.The carbon conversion rate,H₂ yield,and CO yield reached the maximum when GHSV=7881.603m L/（g·h）.Obviously in this experiment,the optimal GHSV is7881.603m L/（g·h）,the optimal temperature is 1100℃,and the optimal equivalent ratio is 4.5.When the optimum experimental conditions were temperature 1100℃,equivalent ratio 4.5 and GHSV=7881.603m L/（g·h）,carbon conversion rate reached 49.27%,H2production was 5.088mmol/g and CO production was 3.28mmol/g.Combined analysis of XRD and EPMA,the iron oxide in the copper slag was reduced to Fe O and Fe,and Fe₃O₄ almost disappeared under the condition of higher than 1000℃.Both XPS C1S and Raman spectroscopy analysis showed that the removal of carbon deposits was mainly due to copper slag.The experiment proves that the iron oxide in the copper slag has the function of reduce carbon deposits.（3）When CO₂ is used as a gasification agent,CO₂ can undergo dry reforming and reduction reactions with volatiles,tar and coke at high temperatures.The higher the temperature,the more intense the gasification reaction take place and the higher the carbon conversion rate.Due to the reverse process of water-gas shift reaction,the proportion of gas-producing components of CO is the highest.Increasing the CO₂/C is conducive to promoting the reaction.The CO₂,H₂ gas yields and carbon conversion rates tend to stabilize while the proportion of CO₂ in the produced gas rises.In summary,the CO₂ ratio should not be too high.Too high GSHV will cause incomplete decomposition of products,resulting in a decrease in carbon conversion rate,but little increase in H₂ and CO yield.Obviously,in this experiment,the optimal space velocity is 2577.64m L/gh,the optimal temperature is 1100℃,and the best CO₂/C is 0.69.The carbon deposition defects with CO₂ as gasification agent are larger than those in air as gasification agent.And the CO₂ gasification effect is better,which is positively related to the carbon conversion rate of the two experiments.When the optimum experimental conditions were temperature 1100℃,CO2/C=0.69 and GHSV=2577.64m L/（g·h）,the carbon conversion rate reached 84%,the H2 yield was 4.59mmol/g and the CO yield was 8.75mmol/g.