A series of self-reducing bifunctional Ni-W/SBA-15 catalysts were synthesized using biomass-based carbon source as the reducing agent without conventional further reduction step. The self-reducing catalysts were perfo...A series of self-reducing bifunctional Ni-W/SBA-15 catalysts were synthesized using biomass-based carbon source as the reducing agent without conventional further reduction step. The self-reducing catalysts were performed on the hydrogenolysis of cellulose to low carbon polyols. The effects of calcination temperature and metallic loading contents for cellulose hydrogenolysis reaction were investigated detailedly.The optimal calcination temperature was found to be 673 K by TG analysis. The active metal nanoparticles with a better dispersion were observed using SEM and element mapping technology. The yield of low carbon polyols using the catalyst with the receipt of 10%Ni-15%W/SBA-15-673 K can reach as high as68.14%, of which the ethylene glycol(EG) accounts for 61.04%.展开更多
In 2023,1888 Mt of steel were produced worldwide,with 70%via integrated cycle steel plant,generating 34 Mt of dust and 25 Mt of sludge.These wastes are rich in Fe and C but are too fine for direct recycling.Agglomerat...In 2023,1888 Mt of steel were produced worldwide,with 70%via integrated cycle steel plant,generating 34 Mt of dust and 25 Mt of sludge.These wastes are rich in Fe and C but are too fine for direct recycling.Agglomeration is therefore essential to recycle them as suitable feedstock.This work studies how water-powder interactions affect the mechanical(impact resistance,cold compressive strength)and metallurgical(degree of reduction,swelling)properties of self-reducing briquettes made by combining two iron-bearing dusts(BOF dust and a secondary dust)with two reducing agents(BF sludge and another secondary dust)to form hydrophilic-hydrophilic,hydrophobic-hydrophilic,and hydrophobic-hydrophobic mixtures.Water expelled from hydrophobic dust acts as a lubricant during compaction,reducing surface cracks and enhancing eight times the impact resistance.Hydrophilic particles,however,lower impact resistance(failing 10-drop tests)due to hydration repulsion that weakens the briquette.While water absorbed by hydrophilic powders forms gasification channels on drying,enabling a reduction degree up to 94%,it also causes severe swelling below 1200℃.The best overall performance was achieved by a hydrophobic-hydrophilic combination with double water content,yielding compressive strength of 18 MPa,degree of reduction of 91%and swelling of-1.86%.展开更多
基金supported by scientific research project of Zhejiang Provincial Education Department(Grant No.Y20112088,China)Science and technology project of Zhejiang Province(Grant No.2011R09028-10,China)
文摘A series of self-reducing bifunctional Ni-W/SBA-15 catalysts were synthesized using biomass-based carbon source as the reducing agent without conventional further reduction step. The self-reducing catalysts were performed on the hydrogenolysis of cellulose to low carbon polyols. The effects of calcination temperature and metallic loading contents for cellulose hydrogenolysis reaction were investigated detailedly.The optimal calcination temperature was found to be 673 K by TG analysis. The active metal nanoparticles with a better dispersion were observed using SEM and element mapping technology. The yield of low carbon polyols using the catalyst with the receipt of 10%Ni-15%W/SBA-15-673 K can reach as high as68.14%, of which the ethylene glycol(EG) accounts for 61.04%.
文摘In 2023,1888 Mt of steel were produced worldwide,with 70%via integrated cycle steel plant,generating 34 Mt of dust and 25 Mt of sludge.These wastes are rich in Fe and C but are too fine for direct recycling.Agglomeration is therefore essential to recycle them as suitable feedstock.This work studies how water-powder interactions affect the mechanical(impact resistance,cold compressive strength)and metallurgical(degree of reduction,swelling)properties of self-reducing briquettes made by combining two iron-bearing dusts(BOF dust and a secondary dust)with two reducing agents(BF sludge and another secondary dust)to form hydrophilic-hydrophilic,hydrophobic-hydrophilic,and hydrophobic-hydrophobic mixtures.Water expelled from hydrophobic dust acts as a lubricant during compaction,reducing surface cracks and enhancing eight times the impact resistance.Hydrophilic particles,however,lower impact resistance(failing 10-drop tests)due to hydration repulsion that weakens the briquette.While water absorbed by hydrophilic powders forms gasification channels on drying,enabling a reduction degree up to 94%,it also causes severe swelling below 1200℃.The best overall performance was achieved by a hydrophobic-hydrophilic combination with double water content,yielding compressive strength of 18 MPa,degree of reduction of 91%and swelling of-1.86%.
