FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Yilun Sun,Meng Huang,Jingpeng Li,Zhiyuan Wang,Jianxin Zhou
The coke in the coils has a serious impact on the long-term and stable operation of the ethylene plant . Inhibiting coking of the cracking furnace is an important issue. In this paper, the Cr/CeO 2 coatings were prepared on the surface of 310S stainless steel by high-velocity oxygen-fuel (HVOF) spraying. The anti-coking performances of the bare 310S specimen and the Cr/CeO 2 coatings were tested by using the pyrolysis of naphtha . The results show that the coating with the thickness of 10–15 μm and a very small number of pores was built up by the obviously deformed splats and the coating/substrate interface is jagged bond. The white area on the surface of Cr/CeO 2 coatings mainly includes CeO 2 . However, the gray area is made of Cr or Cr 2 O 3 . Compared with the bare 310S specimen, the coking inhibition rates of coatings are 48.7%, 58.9%, 76.1% and 88.9% when the ratio of Cr and CeO 2 powder is 19:1, 9:1, 4:1 and 3:2, respectively. With increasing the relative ratio of CeO 2 , more white areas without coke are exposed. The CeO 2 surface can not only inhibit catalytic coking, but also promote the reaction of water vapor and coke.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 37
·17412-17418
·
IF 5.8
Xiaofen Xiao,Deqiang Wang,Guangyi Xu,Zhuxiang Zhang,Jun Li,Shun Wang,Yifei Yuan,Chuangang Hu,Huile Jin
It is difficult to achieve fast kinetics of Zn2+(H2O)6 desolvation as well as HER inertia at the same electrolyte/Zn interface during long-term cycling of Zn plating/stripping in aqueous Zn-ion batteries. Herein, an effective interface construction strategy with hydrophilic transition metal oxides was proposed to achieve that balance using a CeO2 layer coating. The hydrophilic CeO2 layer can bring a balance between improving the access to the anode surface for Zn2+(H2O)6 electrolyte ions, providing uniform Zn2+ nucleation sites and HER inertia. What's more, Zn corrosion can be significantly inhibited benefiting from this coating layer. The efficiency of aqueous Zn-ion batteries showed a great enhancement. Ultra-long plating/stripping stability up to 1600 h and excellent recovery (returning to 0.5 from 20 mA cm−2) for the symmetric CeO2@Zn system were observed. A full cell with the MnO2 cathode (CeO2@Zn//MnO2) with good reversibility and stability (∼600 cycles) was fabricated for practical application. Our work provides a fundamental understanding and an essential solution to deal with the balance between rapid desolvation and inhibition of the hydrogen evolution reaction, which is important for promoting the practical application of rechargeable Zn batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Zuozhu Yin,Zihao Li,Yuanting Deng,Mingshan Xue,Yuhua Chen,Junfei Ou,Yu Xie,Yidan Luo,Chan Xie,Zhen Hong
Complicated contaminants in wastewater, such as intractable oils, organic colors, and adhering organisms, have generated major environmental problems that are hazardous to ecosystems and human health, and wastewater purification is complex and difficult to achieve with a single substance or single process. A facile yet environmentally friendly technique for fabricating a superhydrophobic, oil-water separation, anti-bioadhesion, and photocatalytic Pulp/cellulose nanofibers (CNFs) membrane for all-in-one wastewater treatment is presented here. In this strategy, the hierarchical micro/nanostructured CeO 2 nanoparticles and stearic acid (STA)-coated Pulp/CNF (Pulp/CNF-CeO 2 -STA) membrane is fabricated via a straightforward and easy-to-operate coating method, which simultaneously endows the membrane with superwetting ability, good oil-water separation capacity, notable photocatalytic degradation capacity, and outstanding anti-bioadhesion action. According to the experimental results, the suitably prepared Pulp/CNF-CeO 2 -STA membrane displayed superior superhydrophobicity (water contact angle: 166 ± 2°), high separation efficiency (88%), and high throughput (73 L·m −2 ·h −1 ). This Pulp/CNF-CeO 2 -STA membrane also showed significant photocatalytic degradation (>94%) of organic dye pollutants in water, as well as good anti-bioadhesive performance against Chlorella . As such, it serves several functions in wastewater treatment, considerably simplifying installation and saving money in application. In conclusion, this unique coating process is environmentally benign and very practicable, paving the door for the development of multi-functional materials in environmental treatments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Manufacturing Processes
·
2023
·
IF 6.2
Yongchao Xu,Guangen Zhao,Qianting Wang,Youji Zhan,Bingsan Chen
Toxic and polluted ingredients are normally employed in the chemical mechanical polishing of sapphire wafers, which results in widespread environmental pollution. Thus, developing a novel green polishing technology is a significant challenge to achieve ultra-smooth and efficient polishing. In this study, novel CeO 2 coated diamond composite abrasives were used in the semi-fixed abrasive polishing of sapphire wafers, which were successfully synthesized by a modified precipitation approach without using explosive hazardous chemicals . During the whole polishing process, the polishing slurry only contains deionized water, without any other chemical reagents, to avoid environmental pollution. Polishing results showed that the surface roughness of sapphire polished by the composite abrasives was reduced to 6.1 nm, which was 26.5 % lower than that of pure diamond. Meanwhile, the material removal rate was 1.46 nm/min, with an improvement of 10.6 %, as well as a reduction in residual stress by approximately 29.8 %. Combined with the theory of micro-contact mechanics, the polishing mechanism and interfacial contact behavior of composite abrasives were investigated in depth through the analysis of polished sapphire surface and wear debris. The improvement of polishing performance may be attributed to the enhancement of solid-state reaction and its mutual balance with the mechanical removal action of composite abrasives.
研究领域:
材料科学
·
环境工程
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）