Catalytic pyrolysis process(CPP)producing ethylene and propylene from paraffin base atmospheric residue was developed by RIPP and its first in the world unit was put into commercial operation successfully.The results ...Catalytic pyrolysis process(CPP)producing ethylene and propylene from paraffin base atmospheric residue was developed by RIPP and its first in the world unit was put into commercial operation successfully.The results of performance test showed that the yield of ethylene and propylene reached 14.84% and 22.21% ,respectively,at a reaction temperature of610℃by using Daqing atmospheric residue as the feedstock under an operation mode of producing ethylene and propylene at the same time,and the aromatic content of cracked naphtha reached 82.46% .The successful operation of this unit has opened a novel route for producing light olefins and aromatics from heavy oil,which is also a good example symbolizing the integration of refining technology with petrochemical process.展开更多
From the viewpoint of process specifics and thermodynamics, this article has put forward a route for maximiza- tion of low-carbon olefins via co-processing of methanol and heavy oil. Catalytic cracking experiments on ...From the viewpoint of process specifics and thermodynamics, this article has put forward a route for maximiza- tion of low-carbon olefins via co-processing of methanol and heavy oil. Catalytic cracking experiments on co-processing of methanol and heavy oil at different ratios in a fixed fluidized bed reactor had been conducted. Test results have revealed that when 12.5% of methanol was blended to the heavy oil a good products distribution and relatively higher yield of low-carbon olefins could be obtained. The overall yield of low-carbon olefins could reach 50.16%, with the yield of ethylene, propylene and butylene equating to 5.47 %, 28.93% and 15.76 %, respectively.展开更多
In-plane heteroatom substitution of graphene is a promising strategy to modify its properties. The ability to dope graphene with electron-donor nitrogen heteroatoms is highly important for modulating electrical proper...In-plane heteroatom substitution of graphene is a promising strategy to modify its properties. The ability to dope graphene with electron-donor nitrogen heteroatoms is highly important for modulating electrical properties of graphene. Here we demonstrate a transfer-free method to directly grow large area quasi free-standing N-doped graphene bilayers on an insulating substrate （Si3N4）. Electron-bombardment heating under nitrogen flux results in simultaneous growth of N-doped graphene and a Si3N4 layer on the SiC surface. The decoupling of N-doped graphene from the substrate and the presence of Si3N4 are identified by X-ray photoemission spectroscopy and low-energy electron diffraction. The substitution of nitrogen atoms in the graphene planes was confirmed using high resolution X-ray photoemission spectroscopy which reveals several atomic configurations for the nitrogen atoms： Graphitic-like, pyridine-like, and pyrrolic- like. Furthermore, we demonstrated for the first time that N-doped graphene could be used to efficiently probe oxygen molecules via nitrogen atom defects.展开更多
文摘Catalytic pyrolysis process(CPP)producing ethylene and propylene from paraffin base atmospheric residue was developed by RIPP and its first in the world unit was put into commercial operation successfully.The results of performance test showed that the yield of ethylene and propylene reached 14.84% and 22.21% ,respectively,at a reaction temperature of610℃by using Daqing atmospheric residue as the feedstock under an operation mode of producing ethylene and propylene at the same time,and the aromatic content of cracked naphtha reached 82.46% .The successful operation of this unit has opened a novel route for producing light olefins and aromatics from heavy oil,which is also a good example symbolizing the integration of refining technology with petrochemical process.
文摘From the viewpoint of process specifics and thermodynamics, this article has put forward a route for maximiza- tion of low-carbon olefins via co-processing of methanol and heavy oil. Catalytic cracking experiments on co-processing of methanol and heavy oil at different ratios in a fixed fluidized bed reactor had been conducted. Test results have revealed that when 12.5% of methanol was blended to the heavy oil a good products distribution and relatively higher yield of low-carbon olefins could be obtained. The overall yield of low-carbon olefins could reach 50.16%, with the yield of ethylene, propylene and butylene equating to 5.47 %, 28.93% and 15.76 %, respectively.
文摘In-plane heteroatom substitution of graphene is a promising strategy to modify its properties. The ability to dope graphene with electron-donor nitrogen heteroatoms is highly important for modulating electrical properties of graphene. Here we demonstrate a transfer-free method to directly grow large area quasi free-standing N-doped graphene bilayers on an insulating substrate （Si3N4）. Electron-bombardment heating under nitrogen flux results in simultaneous growth of N-doped graphene and a Si3N4 layer on the SiC surface. The decoupling of N-doped graphene from the substrate and the presence of Si3N4 are identified by X-ray photoemission spectroscopy and low-energy electron diffraction. The substitution of nitrogen atoms in the graphene planes was confirmed using high resolution X-ray photoemission spectroscopy which reveals several atomic configurations for the nitrogen atoms： Graphitic-like, pyridine-like, and pyrrolic- like. Furthermore, we demonstrated for the first time that N-doped graphene could be used to efficiently probe oxygen molecules via nitrogen atom defects.
