研究目的
To investigate the photocatalytic performance and mechanism of a new La3+–Zn2+–Al3+–MoO4 2- layered double hydroxide material for the degradation of benzothiophene in diesel oil.
研究成果
The La3+–Zn2+–Al3+–MoO4 2- LDH material exhibited high desulfurization efficiency of 87% under UV irradiation in 2 hours, with good stability over multiple cycles. The mechanism involves increased interlayer space and active sites from MoO4 2- promoting adsorption and oxidation of BT. This catalyst shows potential for photocatalytic degradation of organic sulfur compounds in fuels.
研究不足
The study is limited to model oil with benzothiophene; real diesel oil with complex sulfur compounds was not tested. The catalyst's performance under visible light was lower than under UV light, indicating a limitation in light utilization efficiency. Potential optimization areas include scaling up for industrial applications and testing with actual diesel fuels.
1：Experimental Design and Method Selection:
The study involved preparing a La3+–Zn2+–Al3+–MoO4 2- LDH material using a complexing agent-assisted homogeneous precipitation technique, followed by characterization and photocatalytic desulfurization experiments under UV irradiation.
2：Sample Selection and Data Sources:
Simulated oil was prepared using benzothiophene (BT) as a solvent in oil and hexane.
3：List of Experimental Equipment and Materials:
Equipment included SHIMADZU XRD-6000 X-ray powder diffractometer, Quantum 200 environmental scanning electron microscope, Bruker FTIR, UV-2600 Shimadzu spectrophotometer, Agilent ICP-OES 720, and Shimadzu HPLC system. Materials included La(NO3)3·6H2O, Zn(NO3)2·6H2O, Al(NO3)3·9H2O, urea, sodium chloride, concentrated hydrochloric acid, Na2MoO4, hydrogen peroxide, and deionized water.
4：Experimental Procedures and Operational Workflow:
The LDH was prepared in three steps: precipitation, ion exchange, and drying. Characterization involved XRD, SEM, FTIR, BET surface area analysis, UV-Vis DRS, and ICP-OES. Photocatalytic reactions were conducted in a quartz tube with UV lamp irradiation, and sulfur content was analyzed by HPLC.
5：Data Analysis Methods:
Desulfurization rate was calculated using the formula: (c0 - c)/c0 * 100, where c0 is initial sulfur content and c is after desulfurization. Band gap energies were determined from UV-Vis DRS data.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
