期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Selective and stable Au-Cu bimetallic catalyst for CO-PROX 被引量:2
1
作者 Feng Hong Guanjian Cheng +5 位作者 Weihao Hu Shengyang Wang Qike Jiang Junhong Fu Botao Qiao Jiahui Huang 《Nano Research》 SCIE EI CSCD 2023年第7期9031-9038,共8页
Gold-based catalysts are promising in CO preferential oxidation(CO-PROX)reaction in H_(2)-rich stream on account of their high intrinsic activity for CO elimination even at ambient temperature.However,the decrease of ... Gold-based catalysts are promising in CO preferential oxidation(CO-PROX)reaction in H_(2)-rich stream on account of their high intrinsic activity for CO elimination even at ambient temperature.However,the decrease of CO conversion at elevated temperature due to the competition of H_(2)oxidation,together with the low stability of gold nanoparticles,has posed a dear challenge.Herein,we report that Au-Cu bimetallic catalyst prepared by galvanic replacement method shows a wide temperature window for CO total conversion(30-100℃)and very good catalyst stability without deactivation in a 200-h test.Detailed characterizations combined with density functional theory(DFT)calculation reveal that the synergistic effect of Au-Cu,the electron transfer from Au to Cu,leads to not only strengthened chemisorption of CO but also weakened dissociation of H_(2),both of which are helpful in inhibiting the competition of H_(2)oxidation thus widening the temperature window for CO total conversion. 展开更多
关键词 gold catalysis CO preferential oxidation(CO-PROX) electronic interaction galvanic replacement
原文传递
Stable CuO/La_(2)Sn_(2)O_(7) catalysts for soot combustion:Study on the monolayer dispersion behavior of CuO over a La_(2)Sn_(2)O_(7) pyrochlore support 被引量:2
2
作者 Xiaohui Feng Rui Liu +6 位作者 Xianglan Xu Yunyan Tong Shijing Zhang Jiacheng He Junwei Xu Xiuzhong Fang Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第3期396-408,共13页
To understand the dispersion behavior of metal oxides on composite oxide supports and with the expectation of developing more feasible catalysts for soot oxidation,CuO/La_(2)Sn_(2)O_(7)samples containing varied CuO lo... To understand the dispersion behavior of metal oxides on composite oxide supports and with the expectation of developing more feasible catalysts for soot oxidation,CuO/La_(2)Sn_(2)O_(7)samples containing varied CuO loadings were fabricated and characterized by different techniques and density functional theory calculations.In these catalysts,a spontaneous dispersion of CuO on the La_(2)Sn_(2)O_(7)pyrochlore support formed,having a monolayer dispersion capacity of 1.90 mmol CuO/100 m^(2) La_(2)Sn_(2)O_(7)surface.When loaded below this capacity,CuO exists in a sub-monolayer or monolayer state.X-ray photoelectron spectroscopy(XPS),Raman spectroscopy,and Bader charge and density of states analyses indicate that there are strong interactions between the sub-monolayer/monolayer CuO and the La_(2)Sn_(2)O_(7)support,mainly through the donation of electrons from Cu to Sn at the B-sites of the structure.In contrast,Cu has negligible interactions with La at the A-sites.This suggests that,in composite oxide supports containing multiple metals,the supported metal oxide interacts preferentially with one kind of metal cation in the support.The Raman,in situ diffuse reflectance infrared Fourier transform spectroscopy,and XPS results confirmed the formation of both O2^(-)and O2^(2-)as the active sites on the surfaces of the CuO/La_(2)Sn_(2)O_(7)catalysts,and the concentration of these active species determines the soot combustion activity.The number of active oxygen anions increased with increase in CuO loading until the monolayer dispersion capacity was reached.Above the monolayer dispersion capacity,microsized CuO crystallites formed,and these had a negative effect on the generation of active surface oxygen sites.In summary,a highly active catalyst can be prepared by covering the surface of the La_(2)Sn_(2)O_(7)support with a CuO monolayer. 展开更多
关键词 CuO/La_(2)Sn_(2)O_(7)catalyst Soot combustion DFT calculations preferential interaction Monolayer dispersion on pyrochlore support Active O2^(-)and O2^(2-)sites
下载PDF
Effect of Substrate-Water Interaction on the Wetting Behavior in Water-Oil and Substrate-Water-Oil Systems
3
作者 Yuan Yin-quan 1,2 , Zou Xian-wu 1 , Jin Zhun-zhi 1 1. School of Physics and Technology, Wuhan University, Wuhan 430072, Hubei, China 2. Department of Physics, Xiaogan University, Xiaogan 432100, Hubei, China 《Wuhan University Journal of Natural Sciences》 CAS 2003年第04A期1097-1102,共6页
The effects of the substrate-water interaction on the wetting behavior in water-oil and surfactant-water-oil systems confined by one substrate which has the preferential interaction to one species of particles have be... The effects of the substrate-water interaction on the wetting behavior in water-oil and surfactant-water-oil systems confined by one substrate which has the preferential interaction to one species of particles have been investigated by using the free energy analysis and discontinuous molecular dynamic simulations. As the preferential interaction between the substrate and water particles varies from small repulsion to large attraction, the partial drying, partial wetting and complete wetting state are observed in sequence. In addition, the wetting behavior of surfactant aqueous solution on the substrate is not only dependent on the interaction, but also limited by the maximum equilibrium concentration of surfactants at the interface. 展开更多
关键词 wetting behavior wetting transition preferential interaction SUBSTRATE
下载PDF
分散化税收优惠、生产率异质性与企业创新产出
4
作者 施炳展 吴丽帆 《南开经济研究》 CSSCI 北大核心 2023年第12期163-180,共18页
党的二十大报告明确指出创新是第一动力。本文利用中国工业企业数据库和国家知识产权专利数据库,探究了分散化税收优惠政策与生产率异质性对企业创新产出的交互作用及其作用机制。研究发现,分散化税收优惠政策因生产率异质性对企业创新... 党的二十大报告明确指出创新是第一动力。本文利用中国工业企业数据库和国家知识产权专利数据库,探究了分散化税收优惠政策与生产率异质性对企业创新产出的交互作用及其作用机制。研究发现,分散化税收优惠政策因生产率异质性对企业创新产出存在差异性影响。作用机制是分散化税收优惠政策会通过市场竞争、融资约束缓解来对生产率异质性企业的创新产出产生差异性影响。分散化税收优惠政策与生产率异质性对企业创新产出的交互作用还体现在不同区域、不同技术距离的企业之间。分散化税收优惠政策与生产率异质性对企业创新产出的交互作用还具有非线性、广泛性和稳健性等特征。本文的政策含义是,由于创新资源具有稀缺性,为营造竞争友好的市场环境并促进企业创新产出,政府应该制定能强化竞争的分散化税收优惠政策。 展开更多
关键词 分散化税收优惠政策 生产率异质性 交互作用 创新产出 专利数量
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部