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Zhiming Zhou – One of the best experts on this subject based on the ideXlab platform.

  • Unravelling the role of Alkaline earth Metal carbonates in intermediate temperature CO2 capture using Alkali Metal Salt-promoted MgO-based sorbents
    Journal of Materials Chemistry A, 2020
    Co-Authors: Hongjie Cui, Zhenmin Cheng, Zhiming Zhou
    Abstract:

    Alkali Metal Salt (AMS)-promoted MgO sorbents are promising for intermediate temperature CO2 capture due to their high capacity, but suffer from slow sorption kinetics and poor stability which hinder their applications. Herein, we report that incorporation of Alkaline earth Metal carbonates (CaCO3, SrCO3 or BaCO3) into AMS-promoted MgO can improve the CO2 capture performance of the sorbent in multiple sorption/desorption cycles. Experimental studies reveal that CaCO3 and BaCO3 participate in MgO carbonation with fast and reversible formation of dolomite and norsethite, respectively, thus resulting in a rate enhancement, while SrCO3 is inert for CO2 sorption but acts as a stabilizer to prevent sintering of MgO particles and in turn improve the sorbent stability. Kinetic studies show that the activation enthalpy of sorption at the surface reaction-controlled stage is 36.9, 28.1, 35.3, and 30.6 kJ mol−1 for AMS-MgO and AMS-MgO doped with CaCO3, SrCO3 and BaCO3, respectively, which agrees well with the rate enhancement of the CaCO3- or BaCO3-doped sorbent. This discovery offers new opportunities to develop high-performance MgO-based CO2 sorbents by doping with Alkaline earth Metal carbonates.

  • Sorption-enhanced water gas shift reaction by in situ CO2 capture on an Alkali Metal Salt-promoted MgO-CaCO3 sorbent
    Chemical Engineering Journal, 2019
    Co-Authors: Hongjie Cui, Zhenmin Cheng, Zhiming Zhou
    Abstract:

    Abstract CO2 capture and sequestration is one of the viable solutions to reduce the CO2 emissions from fossil fuelfuel combcombustion, and sorption-enhanced water gas shift (SEWGS) is a promising technology for pre-combustion CO2 capture. In this study, a novel Alkali Metal Salt (AMS)-promoted MgO-CaCO3 sorbent was applied to the SEWGS process, and this sorbent exhibited fast sorption rate, high capacity and good stability in 30 CO2 capture cycles. Catalyst and sorbent particles were arranged in a layer-by-layer alternating configuration in the reactor. The effects of operating conditions such as temperature, pressure and initial H2O/CO molar ratio were investigated, and the thermodynamic equilibrium analyses of the CO2 sorption on AMS-promoted MgO-CaCO3 and the SEWGS process in the layered configuration were carried out, based on which the optimization of the reactor configuration was performed. A high-purity H2 (99.4% in dry basis) was experimentally achieved in the SEWGS process at 573 K, 12 atm and an initial H2O/CO molar ratio of 1.5 with a three catalyst/sorbent layered configuration, and the cyclic stability was demonstrated over 10 consecutive SEWGS cycles.

  • Ultrafast and stable CO2 capture using Alkali Metal Salt-promoted MgO–CaCO3 sorbents
    ACS applied materials & interfaces, 2018
    Co-Authors: Hongjie Cui, Qiming Zhang, Chong Peng, Xiangchen Fang, Zhenmin Cheng, Vladimir V. Galvita, Zhiming Zhou
    Abstract:

    As a potential candidate for precombustion CO2 capture at intermediate temperatures (200–400 °C), MgO-based sorbents usually suffer from low kinetics and poor cyclic stability. Herein, a general and facile approach is proposed for the fabrication of high-performance MgO-based sorbents via incorporation of CaCO3 into MgO followed by deposition of a mixed Alkali Metal Salt (AMS). The AMS-promoted MgO–CaCO3 sorbents are capable of adsorbing CO2 at an ultrafast rate, high capacity, and good stability. The CO2 uptake of sorbent can reach as high as above 0.5 gCO2 gsorbent–1 after only 5 min of sorption at 350 °C, accounting for vast majority of the total uptake. In addition, the sorbents are very stable even under severe but more realistic conditions (desorption in CO2 at 500 °C), where the CO2 uptake of the best sorbent is stabilized at 0.58 gCO2 gsorbent–1 in 20 consecutive cycles. The excellent CO2 capture performance of the sorbent is mainly due to the promoting effect of molten AMS, the rapid formation of…

Hongjie Cui – One of the best experts on this subject based on the ideXlab platform.

  • Unravelling the role of Alkaline earth Metal carbonates in intermediate temperature CO2 capture using Alkali Metal Salt-promoted MgO-based sorbents
    Journal of Materials Chemistry A, 2020
    Co-Authors: Hongjie Cui, Zhenmin Cheng, Zhiming Zhou
    Abstract:

    Alkali Metal Salt (AMS)-promoted MgO sorbents are promising for intermediate temperature CO2 capture due to their high capacity, but suffer from slow sorption kinetics and poor stability which hinder their applications. Herein, we report that incorporation of Alkaline earth Metal carbonates (CaCO3, SrCO3 or BaCO3) into AMS-promoted MgO can improve the CO2 capture performance of the sorbent in multiple sorption/desorption cycles. Experimental studies reveal that CaCO3 and BaCO3 participate in MgO carbonation with fast and reversible formation of dolomite and norsethite, respectively, thus resulting in a rate enhancement, while SrCO3 is inert for CO2 sorption but acts as a stabilizer to prevent sintering of MgO particles and in turn improve the sorbent stability. Kinetic studies show that the activation enthalpy of sorption at the surface reaction-controlled stage is 36.9, 28.1, 35.3, and 30.6 kJ mol−1 for AMS-MgO and AMS-MgO doped with CaCO3, SrCO3 and BaCO3, respectively, which agrees well with the rate enhancement of the CaCO3- or BaCO3-doped sorbent. This discovery offers new opportunities to develop high-performance MgO-based CO2 sorbents by doping with Alkaline earth Metal carbonates.

  • Sorption-enhanced water gas shift reaction by in situ CO2 capture on an Alkali Metal Salt-promoted MgO-CaCO3 sorbent
    Chemical Engineering Journal, 2019
    Co-Authors: Hongjie Cui, Zhenmin Cheng, Zhiming Zhou
    Abstract:

    Abstract CO2 capture and sequestration is one of the viable solutions to reduce the CO2 emissions from fossil fuel combustion, and sorption-enhanced water gas shift (SEWGS) is a promising technology for pre-combustion CO2 capture. In this study, a novel Alkali Metal Salt (AMS)-promoted MgO-CaCO3 sorbent was applied to the SEWGS process, and this sorbent exhibited fast sorption rate, high capacity and good stability in 30 CO2 capture cycles. Catalyst and sorbent particles were arranged in a layer-by-layer alternating configuration in the reactor. The effects of operating conditions such as temperature, pressure and initial H2O/CO molar ratio were investigated, and the thermodynamic equilibrium analyses of the CO2 sorption on AMS-promoted MgO-CaCO3 and the SEWGS process in the layered configuration were carried out, based on which the optimization of the reactor configuration was performed. A high-purity H2 (99.4% in dry basis) was experimentally achieved in the SEWGS process at 573 K, 12 atm and an initial H2O/CO molar ratio of 1.5 with a three catalyst/sorbent layered configuration, and the cyclic stability was demonstrated over 10 consecutive SEWGS cycles.

  • Ultrafast and stable CO2 capture using Alkali Metal Salt-promoted MgO–CaCO3 sorbents
    ACS applied materials & interfaces, 2018
    Co-Authors: Hongjie Cui, Qiming Zhang, Chong Peng, Xiangchen Fang, Zhenmin Cheng, Vladimir V. Galvita, Zhiming Zhou
    Abstract:

    As a potential candidate for precombustion CO2 capture at intermediate temperatures (200–400 °C), MgO-based sorbents usually suffer from low kinetics and poor cyclic stability. Herein, a general and facile approach is proposed for the fabrication of high-performance MgO-based sorbents via incorporation of CaCO3 into MgO followed by deposition of a mixed Alkali Metal Salt (AMS). The AMS-promoted MgO–CaCO3 sorbents are capable of adsorbing CO2 at an ultrafast rate, high capacity, and good stability. The CO2 uptake of sorbent can reach as high as above 0.5 gCO2 gsorbent–1 after only 5 min of sorption at 350 °C, accounting for vast majority of the total uptake. In addition, the sorbents are very stable even under severe but more realistic conditions (desorption in CO2 at 500 °C), where the CO2 uptake of the best sorbent is stabilized at 0.58 gCO2 gsorbent–1 in 20 consecutive cycles. The excellent CO2 capture performance of the sorbent is mainly due to the promoting effect of molten AMS, the rapid formation of…

Zhenmin Cheng – One of the best experts on this subject based on the ideXlab platform.

  • Unravelling the role of Alkaline earth Metal carbonates in intermediate temperature CO2 capture using Alkali Metal Salt-promoted MgO-based sorbents
    Journal of Materials Chemistry A, 2020
    Co-Authors: Hongjie Cui, Zhenmin Cheng, Zhiming Zhou
    Abstract:

    Alkali Metal Salt (AMS)-promoted MgO sorbents are promising for intermediate temperature CO2 capture due to their high capacity, but suffer from slow sorption kinetics and poor stability which hinder their applications. Herein, we report that incorporation of Alkaline earth Metal carbonates (CaCO3, SrCO3 or BaCO3) into AMS-promoted MgO can improve the CO2 capture performance of the sorbent in multiple sorption/desorption cycles. Experimental studies reveal that CaCO3 and BaCO3 participate in MgO carbonation with fast and reversible formation of dolomite and norsethite, respectively, thus resulting in a rate enhancement, while SrCO3 is inert for CO2 sorption but acts as a stabilizer to prevent sintering of MgO particles and in turn improve the sorbent stability. Kinetic studies show that the activation enthalpy of sorption at the surface reaction-controlled stage is 36.9, 28.1, 35.3, and 30.6 kJ mol−1 for AMS-MgO and AMS-MgO doped with CaCO3, SrCO3 and BaCO3, respectively, which agrees well with the rate enhancement of the CaCO3- or BaCO3-doped sorbent. This discovery offers new opportunities to develop high-performance MgO-based CO2 sorbents by doping with Alkaline earth Metal carbonates.

  • Sorption-enhanced water gas shift reaction by in situ CO2 capture on an Alkali Metal Salt-promoted MgO-CaCO3 sorbent
    Chemical Engineering Journal, 2019
    Co-Authors: Hongjie Cui, Zhenmin Cheng, Zhiming Zhou
    Abstract:

    Abstract CO2 capture and sequestration is one of the viable solutions to reduce the CO2 emissions from fossil fuel combustion, and sorption-enhanced water gas shift (SEWGS) is a promising technology for pre-combustion CO2 capture. In this study, a novel Alkali Metal Salt (AMS)-promoted MgO-CaCO3 sorbent was applied to the SEWGS process, and this sorbent exhibited fast sorption rate, high capacity and good stability in 30 CO2 capture cycles. Catalyst and sorbent particles were arranged in a layer-by-layer alternating configuration in the reactor. The effects of operating conditions such as temperature, pressure and initial H2O/CO molar ratio were investigated, and the thermodynamic equilibrium analyses of the CO2 sorption on AMS-promoted MgO-CaCO3 and the SEWGS process in the layered configuration were carried out, based on which the optimization of the reactor configuration was performed. A high-purity H2 (99.4% in dry basis) was experimentally achieved in the SEWGS process at 573 K, 12 atm and an initial H2O/CO molar ratio of 1.5 with a three catalyst/sorbent layered configuration, and the cyclic stability was demonstrated over 10 consecutive SEWGS cycles.

  • Ultrafast and stable CO2 capture using Alkali Metal Salt-promoted MgO–CaCO3 sorbents
    ACS applied materials & interfaces, 2018
    Co-Authors: Hongjie Cui, Qiming Zhang, Chong Peng, Xiangchen Fang, Zhenmin Cheng, Vladimir V. Galvita, Zhiming Zhou
    Abstract:

    As a potential candidate for precombustion CO2 capture at intermediate temperatures (200–400 °C), MgO-based sorbents usually suffer from low kinetics and poor cyclic stability. Herein, a general and facile approach is proposed for the fabrication of high-performance MgO-based sorbents via incorporation of CaCO3 into MgO followed by deposition of a mixed Alkali Metal Salt (AMS). The AMS-promoted MgO–CaCO3 sorbents are capable of adsorbing CO2 at an ultrafast rate, high capacity, and good stability. The CO2 uptake of sorbent can reach as high as above 0.5 gCO2 gsorbent–1 after only 5 min of sorption at 350 °C, accounting for vast majority of the total uptake. In addition, the sorbents are very stable even under severe but more realistic conditions (desorption in CO2 at 500 °C), where the CO2 uptake of the best sorbent is stabilized at 0.58 gCO2 gsorbent–1 in 20 consecutive cycles. The excellent CO2 capture performance of the sorbent is mainly due to the promoting effect of molten AMS, the rapid formation of…

Samson A Jenekhe – One of the best experts on this subject based on the ideXlab platform.

  • solution processed Alkali Metal Salt doped electron transport layers for high performance phosphorescent organic light emitting diodes
    Advanced Functional Materials, 2012
    Co-Authors: Taeshik Earmme, Samson A Jenekhe
    Abstract:

    High-performance, blue, phosphorescent organic light-emitting diodes (PhOLEDs) are achieved by orthogonal solution-processing of small-molecule electron-transport material doped with an Alkali Metal Salt, including cesium carbonate (Cs2CO3) or lithium carbonate (Li2CO3). Blue PhOLEDs with solution-processed 4,7-diphenyl-1,10-phenanthroline (BPhen) electron-transport layer (ETL) doped with Cs2CO3 show a luminous efficiency (LE) of 35.1 cd A−1 with an external quanquantum efficiency (EQE) of 17.9%, which are two-fold higher efficiency than a BPhen ETL without a dopant. These solution-processed blue PhOLEDs are much superior compared to devices with vacuum-deposited BPhen ETL/Alkali Metal Salt cathode interfacial layer. Blue PhOLEDs with solution-processed 1,3,5-tris(m-pyrid-3-yl-phenyl)benzene (TmPyPB) ETL doped with Cs2CO3 have a luminous efficiency of 37.7 cd A−1 with an EQE of 19.0%, which is the best performance observed to date in all-solution-processed blue PhOLEDs. The results show that a small-molecule ETL doped with Alkali Metal Salt can be realized by solution-processing to enhance overall device performance. The solution-processed Metal Salt-doped ETLs exhibit a unique rough surface morphology that facilitates enhanced charge-injection and transport in the devices. These results demonstrate that orthogonal solution-processing of Metal Salt-doped electron-transport materials is a promising strategy for applications in various solution-processed multilayered organic electronic devices.

  • Solution‐Processed, Alkali MetalSalt‐Doped, Electron‐Transport Layers for High‐Performance Phosphorescent Organic Light‐Emitting Diodes
    Advanced Functional Materials, 2012
    Co-Authors: Taeshik Earmme, Samson A Jenekhe
    Abstract:

    High-performance, blue, phosphorescent organic light-emitting diodes (PhOLEDs) are achieved by orthogonal solution-processing of small-molecule electron-transport material doped with an Alkali Metal Salt, including cesium carbonate (Cs2CO3) or lithium carbonate (Li2CO3). Blue PhOLEDs with solution-processed 4,7-diphenyl-1,10-phenanthroline (BPhen) electron-transport layer (ETL) doped with Cs2CO3 show a luminous efficiency (LE) of 35.1 cd A−1 with an external quanquantum efficiency (EQE) of 17.9%, which are two-fold higher efficiency than a BPhen ETL without a dopant. These solution-processed blue PhOLEDs are much superior compared to devices with vacuum-deposited BPhen ETL/Alkali Metal Salt cathode interfacial layer. Blue PhOLEDs with solution-processed 1,3,5-tris(m-pyrid-3-yl-phenyl)benzene (TmPyPB) ETL doped with Cs2CO3 have a luminous efficiency of 37.7 cd A−1 with an EQE of 19.0%, which is the best performance observed to date in all-solution-processed blue PhOLEDs. The results show that a small-molecule ETL doped with Alkali Metal Salt can be realized by solution-processing to enhance overall device performance. The solution-processed Metal Salt-doped ETLs exhibit a unique rough surface morphology that facilitates enhanced charge-injection and transport in the devices. These results demonstrate that orthogonal solution-processing of Metal Salt-doped electron-transport materials is a promising strategy for applications in various solution-processed multilayered organic electronic devices.

Taeshik Earmme – One of the best experts on this subject based on the ideXlab platform.

  • solution processed Alkali Metal Salt doped electron transport layers for high performance phosphorescent organic light emitting diodes
    Advanced Functional Materials, 2012
    Co-Authors: Taeshik Earmme, Samson A Jenekhe
    Abstract:

    High-performance, blue, phosphorescent organic light-emitting diodes (PhOLEDs) are achieved by orthogonal solution-processing of small-molecule electron-transport material doped with an Alkali Metal Salt, including cesium carbonate (Cs2CO3) or lithium carbonate (Li2CO3). Blue PhOLEDs with solution-processed 4,7-diphenyl-1,10-phenanthroline (BPhen) electron-transport layer (ETL) doped with Cs2CO3 show a luminous efficiency (LE) of 35.1 cd A−1 with an external quantum efficiency (EQE) of 17.9%, which are two-fold higher efficiency than a BPhen ETL without a dopant. These solution-processed blue PhOLEDs are much superior compared to devices with vacuum-deposited BPhen ETL/Alkali Metal Salt cathode interfacial layer. Blue PhOLEDs with solution-processed 1,3,5-tris(m-pyrid-3-yl-phenyl)benzene (TmPyPB) ETL doped with Cs2CO3 have a luminous efficiency of 37.7 cd A−1 with an EQE of 19.0%, which is the best performance observed to date in all-solution-processed blue PhOLEDs. The results show that a small-molecule ETL doped with Alkali Metal Salt can be realized by solution-processing to enhance overall device performance. The solution-processed Metal Salt-doped ETLs exhibit a unique rough surface morphology that facilitates enhanced charge-injection and transport in the devices. These results demonstrate that orthogonal solution-processing of Metal Salt-doped electron-transport materials is a promising strategy for applications in various solution-processed multilayered organic electronic devices.

  • Solution‐Processed, Alkali MetalSalt‐Doped, Electron‐Transport Layers for High‐Performance Phosphorescent Organic Light‐Emitting Diodes
    Advanced Functional Materials, 2012
    Co-Authors: Taeshik Earmme, Samson A Jenekhe
    Abstract:

    High-performance, blue, phosphorescent organic light-emitting diodes (PhOLEDs) are achieved by orthogonal solution-processing of small-molecule electron-transport material doped with an Alkali Metal Salt, including cesium carbonate (Cs2CO3) or lithium carbonate (Li2CO3). Blue PhOLEDs with solution-processed 4,7-diphenyl-1,10-phenanthroline (BPhen) electron-transport layer (ETL) doped with Cs2CO3 show a luminous efficiency (LE) of 35.1 cd A−1 with an external quantum efficiency (EQE) of 17.9%, which are two-fold higher efficiency than a BPhen ETL without a dopant. These solution-processed blue PhOLEDs are much superior compared to devices with vacuum-deposited BPhen ETL/Alkali Metal Salt cathode interfacial layer. Blue PhOLEDs with solution-processed 1,3,5-tris(m-pyrid-3-yl-phenyl)benzene (TmPyPB) ETL doped with Cs2CO3 have a luminous efficiency of 37.7 cd A−1 with an EQE of 19.0%, which is the best performance observed to date in all-solution-processed blue PhOLEDs. The results show that a small-molecule ETL doped with Alkali Metal Salt can be realized by solution-processing to enhance overall device performance. The solution-processed Metal Salt-doped ETLs exhibit a unique rough surface morphology that facilitates enhanced charge-injection and transport in the devices. These results demonstrate that orthogonal solution-processing of Metal Salt-doped electron-transport materials is a promising strategy for applications in various solution-processed multilayered organic electronic devices.