Three industrial spent S Zorb sorbents extracted from production line were studied with XRD, TPR-MS and XPS. The characterization results of XPS and TPR-MS identified the existence of amorphous Ni_xS_y on industrial s...Three industrial spent S Zorb sorbents extracted from production line were studied with XRD, TPR-MS and XPS. The characterization results of XPS and TPR-MS identified the existence of amorphous Ni_xS_y on industrial spent S Zorb sorbents, while the existing XRD quantitative analysis methods can only provide the long-range order in phase information and the grain size of Ni metal. XPS is a powerful tool to investigate the chemical states of nickel atom and the depthwise distribution of nickel species on S Zorb sorbent. Ni_xS_y and Ni metal species coexist on the industrial spent sorbents, and their percentages to total nickel slightly change with the operating conditions in the surface layer. It proves that Ni_xS_y is a stable intermediate product rather than a transition state. The information can contribute to the better elucidation of S Zorb desulfurization mechanism and offer a new direction for selectivity optimization of industrial S Zorb sorbents.展开更多
The adsorptive separation of ethylene from ethane exhibits a less energy-intensive-alternative technique with development potential among all processes for separation of ethylene/ethane currently. In this approach, ze...The adsorptive separation of ethylene from ethane exhibits a less energy-intensive-alternative technique with development potential among all processes for separation of ethylene/ethane currently. In this approach, zeolite 5 A with different particle sizes ranging from 3 340 nm to 440 nm was prepared by hydrothermal synthesis. The effect of particle size on the adsorptive separation performance of zeolite 5 A was investigated. The results show that the particle size has a significant effect on the ethylene IAST(Ideal Adsorbed Solution Theory) selectivity of zeolite 5 A. The zeolite 5 A with a particle size of 710 nm demonstrated the highest ethylene selectivity(5.6). The relatively high crystallinity of zeolite 5 A is in favor of massive adsorption capacities of ethylene and ethane.展开更多
A Zn-BDC(1,4-benzene-dicarboxylic acid)compound has been studied herein during reversibly adsorbing and desorbing water from a dimethyl formamide(DMF)solvent.The compound is structurally stable and can be reused.XRD,T...A Zn-BDC(1,4-benzene-dicarboxylic acid)compound has been studied herein during reversibly adsorbing and desorbing water from a dimethyl formamide(DMF)solvent.The compound is structurally stable and can be reused.XRD,TG,SEM,and BET results show that the morphology,textural properties and phase can gradually transform from a non-porous compound into a porous Zn-MOF by being exposed in the steam of DMF with trace water.This dried phase[Zn(BDC)]is able to reversibly remove/uptake coordinating water molecules,which can provide Zn-BDC compound with the ability to dehydrate the solvent.展开更多
基金the funding of the project by SINOPEC(No.114138)
文摘Three industrial spent S Zorb sorbents extracted from production line were studied with XRD, TPR-MS and XPS. The characterization results of XPS and TPR-MS identified the existence of amorphous Ni_xS_y on industrial spent S Zorb sorbents, while the existing XRD quantitative analysis methods can only provide the long-range order in phase information and the grain size of Ni metal. XPS is a powerful tool to investigate the chemical states of nickel atom and the depthwise distribution of nickel species on S Zorb sorbent. Ni_xS_y and Ni metal species coexist on the industrial spent sorbents, and their percentages to total nickel slightly change with the operating conditions in the surface layer. It proves that Ni_xS_y is a stable intermediate product rather than a transition state. The information can contribute to the better elucidation of S Zorb desulfurization mechanism and offer a new direction for selectivity optimization of industrial S Zorb sorbents.
基金supported by the National Key R&D Program(2016YFB0301601)
文摘The adsorptive separation of ethylene from ethane exhibits a less energy-intensive-alternative technique with development potential among all processes for separation of ethylene/ethane currently. In this approach, zeolite 5 A with different particle sizes ranging from 3 340 nm to 440 nm was prepared by hydrothermal synthesis. The effect of particle size on the adsorptive separation performance of zeolite 5 A was investigated. The results show that the particle size has a significant effect on the ethylene IAST(Ideal Adsorbed Solution Theory) selectivity of zeolite 5 A. The zeolite 5 A with a particle size of 710 nm demonstrated the highest ethylene selectivity(5.6). The relatively high crystallinity of zeolite 5 A is in favor of massive adsorption capacities of ethylene and ethane.
基金We gratefully acknowledge the financial support from the SINOPEC(G6001-20-ZS-0412).
文摘A Zn-BDC(1,4-benzene-dicarboxylic acid)compound has been studied herein during reversibly adsorbing and desorbing water from a dimethyl formamide(DMF)solvent.The compound is structurally stable and can be reused.XRD,TG,SEM,and BET results show that the morphology,textural properties and phase can gradually transform from a non-porous compound into a porous Zn-MOF by being exposed in the steam of DMF with trace water.This dried phase[Zn(BDC)]is able to reversibly remove/uptake coordinating water molecules,which can provide Zn-BDC compound with the ability to dehydrate the solvent.
