The ethanol electro-reforming process was studied over PtRu/C catalysts synthesized by the modified polyol method with different compositions.In particular,this work reports the influence of anodic Pt:Ru ratio(5:1,2:1...The ethanol electro-reforming process was studied over PtRu/C catalysts synthesized by the modified polyol method with different compositions.In particular,this work reports the influence of anodic Pt:Ru ratio(5:1,2:1 and 1:2)on the organic product distribution(acetaldehyde,acetic acid and ethyl acetate)and pure hydrogen generation at different current densities operation levels.Physicochemical characterization of the catalysts was made by X-ray diffraction(XRD),temperature-programmed reduction(TPR)and N_(2) adsorption-desorption measurements.XRD patterns showed that Ru is introduced into the Pt structure,forming an alloy between both metals.Also,the degree of alloy was higher by increasing the Ru amounts.From TPR profiles Pt was found to be properly reduced while Ru was both in metallic state and forming RuO2.The electrochemical behaviour of each catalyst towards ethanol electroreforming process was investigated through electrochemical techniques in a half cell and a single proton exchange membrane(PEM)cell systems.An intermediate Pt:Ru ratio was found to result in high current density and electrochemical surface area(ECSA)values along with lower amounts of adsorbed species.Also,Ru addition seems to diminish the degree of degradation of the catalyst.Based on characterization and in agreement with essays carried out in a PEM cell at mild conditions(80℃ and 1 atm),PtRu/C 2:1 anode provided the best electrocatalytic results in terms of current density(740 mA cm^(-2)),hydrogen production and selectivity toward acetic acid(up to 15%apart from acetaldehyde and ethyl acetate)while requiring the lowest energy consumption.展开更多
This paper develops a framework for the assessment of global value chain embeddedness based on the dual structure of product embeddedness and functional embeddedness and provides a theoretical demonstration of the dua...This paper develops a framework for the assessment of global value chain embeddedness based on the dual structure of product embeddedness and functional embeddedness and provides a theoretical demonstration of the dual effects of the level, structure and the value sources of global value chain embeddedness on export technology sophistication. From there, the paper carries out an estimation of non-competitive input- output table using quadratic optimized algorithm with differentiation between processing trade and general trade to arrive at various indicators of foreign value-added ratio that reflect the level of global value chain embeddedness. On this basis, the panel econometric model for 27 manufacturing sectors of China between 2001 and 2010 is employed to test the effect of foreign value-added ratio on the technology sophistication of manufacturing export. Our research indicates that by taking part in division of labor in the global value chain and acquiring foreign intermediate inputs, China＇s manufacturing sector has increased its export technology sophistication. It also indicates that, compared with such inputs as raw materials and parts and components, service input has great contributions to technology improvement. With the direct contributions of foreign value-added under control, the foreign value-added from developed countries has a restrictive effect on the R＆D activities of export manufacturing, which gives rise to the one-way technology reliance on dominant enterprises of the value chain and the ＂low-end lock-up＂ effect; meanwhile, the method of embeddedness that takes advantage of the foreign value-added of other countries is more dependent on the indigenous R＆D capacity of export enterprises and thus more favorable to the improvement of export technology sophistication.展开更多
China's 2004 value-added tax(VAT)pilot reform in the Northeast region,which changed the VAT from production type to consumption type,introduced a sizable tax credit for fixed investment in manufacturing industries...China's 2004 value-added tax(VAT)pilot reform in the Northeast region,which changed the VAT from production type to consumption type,introduced a sizable tax credit for fixed investment in manufacturing industries,leading to more investment and higher productivity at firm level.This paper,however,uses difference-in-difference estimation and finds a negative structural effect;that is,the VAT pilot reform leads to a reduction in the export sophistication of Northeast cities relative to other cities in China,and the results hold for a battery of robustness checks.It is found that resources are reallocated towards less-sophisticated industries.As the products with higher export sophistication are more skill and research and development(R&D)intensive,the shortfalls of skilled labor and R&D spending hinder the upgrading process.With a new round of revitalization plans in the Northeast,policymakers should be cautious with similar structural effects and focus on increasing skilled labor supply and R&D investment.展开更多
基金the Spanish Ministry of Economy and Competitiveness(projects CTQ2016-75491-R)for the financial support。
文摘The ethanol electro-reforming process was studied over PtRu/C catalysts synthesized by the modified polyol method with different compositions.In particular,this work reports the influence of anodic Pt:Ru ratio(5:1,2:1 and 1:2)on the organic product distribution(acetaldehyde,acetic acid and ethyl acetate)and pure hydrogen generation at different current densities operation levels.Physicochemical characterization of the catalysts was made by X-ray diffraction(XRD),temperature-programmed reduction(TPR)and N_(2) adsorption-desorption measurements.XRD patterns showed that Ru is introduced into the Pt structure,forming an alloy between both metals.Also,the degree of alloy was higher by increasing the Ru amounts.From TPR profiles Pt was found to be properly reduced while Ru was both in metallic state and forming RuO2.The electrochemical behaviour of each catalyst towards ethanol electroreforming process was investigated through electrochemical techniques in a half cell and a single proton exchange membrane(PEM)cell systems.An intermediate Pt:Ru ratio was found to result in high current density and electrochemical surface area(ECSA)values along with lower amounts of adsorbed species.Also,Ru addition seems to diminish the degree of degradation of the catalyst.Based on characterization and in agreement with essays carried out in a PEM cell at mild conditions(80℃ and 1 atm),PtRu/C 2:1 anode provided the best electrocatalytic results in terms of current density(740 mA cm^(-2)),hydrogen production and selectivity toward acetic acid(up to 15%apart from acetaldehyde and ethyl acetate)while requiring the lowest energy consumption.
基金supported by the youth program of the National Natural Sciences Fund “Effects of embeddedness in GVC on the performance of China local manufacturing”(Grant No.71203105)the youth program of the Cultural and Social Sciences Fund of the Ministry of Education(Grant No.12YJC790123)
文摘This paper develops a framework for the assessment of global value chain embeddedness based on the dual structure of product embeddedness and functional embeddedness and provides a theoretical demonstration of the dual effects of the level, structure and the value sources of global value chain embeddedness on export technology sophistication. From there, the paper carries out an estimation of non-competitive input- output table using quadratic optimized algorithm with differentiation between processing trade and general trade to arrive at various indicators of foreign value-added ratio that reflect the level of global value chain embeddedness. On this basis, the panel econometric model for 27 manufacturing sectors of China between 2001 and 2010 is employed to test the effect of foreign value-added ratio on the technology sophistication of manufacturing export. Our research indicates that by taking part in division of labor in the global value chain and acquiring foreign intermediate inputs, China＇s manufacturing sector has increased its export technology sophistication. It also indicates that, compared with such inputs as raw materials and parts and components, service input has great contributions to technology improvement. With the direct contributions of foreign value-added under control, the foreign value-added from developed countries has a restrictive effect on the R＆D activities of export manufacturing, which gives rise to the one-way technology reliance on dominant enterprises of the value chain and the ＂low-end lock-up＂ effect; meanwhile, the method of embeddedness that takes advantage of the foreign value-added of other countries is more dependent on the indigenous R＆D capacity of export enterprises and thus more favorable to the improvement of export technology sophistication.
基金supported by the National Natural Science Foundation of China(Nos.71803159,71703130)Ministry of Education Project of Humanities and Social Sciences(No.19YJC790061)the Fundamental Research Funds for the Central Universities(No.JBK2007086).
文摘China's 2004 value-added tax(VAT)pilot reform in the Northeast region,which changed the VAT from production type to consumption type,introduced a sizable tax credit for fixed investment in manufacturing industries,leading to more investment and higher productivity at firm level.This paper,however,uses difference-in-difference estimation and finds a negative structural effect;that is,the VAT pilot reform leads to a reduction in the export sophistication of Northeast cities relative to other cities in China,and the results hold for a battery of robustness checks.It is found that resources are reallocated towards less-sophisticated industries.As the products with higher export sophistication are more skill and research and development(R&D)intensive,the shortfalls of skilled labor and R&D spending hinder the upgrading process.With a new round of revitalization plans in the Northeast,policymakers should be cautious with similar structural effects and focus on increasing skilled labor supply and R&D investment.
