Nianci Liu, Te Li, Zhuorui Zhang, Ling Su, Guiquan Jiang
{"title":"Preparation of palladium-based catalysts and use for depolymerization of larch bark tannins","authors":"Nianci Liu, Te Li, Zhuorui Zhang, Ling Su, Guiquan Jiang","doi":"10.1002/apj.3088","DOIUrl":"10.1002/apj.3088","url":null,"abstract":"<p>In this study, we synthesized eight palladium-based catalysts using two carriers, ZrO<sub>2</sub> and MCM-41. These catalysts were used for the degradation of condensed tannins extracted from larch bark. The average polymerization degree and degradation rate of the products were used as indicators to evaluate the efficiency of degradation. The effects of different Pd:Cu loading ratios under the same carrier conditions and the effects of different carriers under the same Pd:Cu loading ratio were investigated. The results revealed that when the carrier was kept constant, the Pd:Cu ratio of 1:1 exhibited the highest efficiency in degrading condensed tannins. Moreover, when the Pd:Cu loading ratio was the same, the degradation efficiency was higher when ZrO<sub>2</sub> was used as the carrier. Based on these findings, the catalyst (Pd<sub>1</sub>-Cu<sub>1</sub>)<sub>5</sub>/ZrO<sub>2</sub> (where “1” are the molar ratios of Pd to Cu added during the preparation of the catalyst and where ‘5’ is the mass percentage of Pd/Cu metal to total catalyst, i.e., 5 wt%), with ZrO<sub>2</sub> as the carrier and a Pd:Cu ratio of 1:1, demonstrated the highest degradation efficiency, with a degradation rate of 73.89%. This catalyst successfully reduced the average polymerization degree of condensed tannins from 9.5 to 2.48.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Removal of thiophene compounds from model fuel with supported copper on active carbon, adsorption kinetics, and isotherms","authors":"Bahador Kazemi, Haleh Golipour, Morteza Mafi, Babak Mokhtarani","doi":"10.1002/apj.3110","DOIUrl":"10.1002/apj.3110","url":null,"abstract":"<p>In this study, the adsorption of thiophene compounds (TCs), including thiophene (T), benzothiophene (BT), and dibenzothiophene (DBT), from model fuels was investigated using modified activated carbon (AC). The model fuel, prepared as a single-solute model at a concentration of 2000 ppm based on a mixture concentration of 3000 ppm, served as the basis for the adsorption experiments. Additionally, an examination of thiophene adsorption from commercial fuels, specifically kerosene, was conducted. Experimental data were used to calculate correlated parameters of adsorption isotherms, kinetic models, and the Fisher factor. The pseudo-second-order model demonstrated the best fit to the experimental data. Notably, the adsorbent consisting of 10% Cu<sup>+</sup> supported on acid-washed activated carbon (A1CN10) exhibited the highest adsorption capacity for TCs, achieving removal percentages of 78%, 96%, and 100% for T, BT, and DBT, respectively. Various methods were employed to investigate the physicochemical properties of the adsorbents, including N<sub>2</sub> adsorption–desorption surface analysis (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). Furthermore, the regeneration of the adsorbent was studied using two techniques: agitation and ultrasound.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141359889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tao Yu, Yu Ma, Xiaoyan Yu, Muhammad Riwan, Mingzhi Wang, Xiaolong Zhou
{"title":"Structure and composition of mesophase pitch prepared from aromatic-rich fluid catalytic cracking slurry under different process conditions","authors":"Tao Yu, Yu Ma, Xiaoyan Yu, Muhammad Riwan, Mingzhi Wang, Xiaolong Zhou","doi":"10.1002/apj.3108","DOIUrl":"10.1002/apj.3108","url":null,"abstract":"<p>The high aromaticity of fluidized catalytic cracking (FCC) slurry makes it a superior raw material for the production of high-performance carbon materials. In this study, direct thermal polycondensation of aromatic-rich FCC slurries is conducted to synthesize mesophase pitches with a significant anisotropic content. The effects of stirring speed and the pressurized-atmospheric two-stage reaction on the structure and composition of the products are investigated. Thermal stability analysis using thermogravimetric (TG) test, observation of mesophase content and optical structure through polarized light microscopy, characterization of material composition and molecular structure via Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectrum (<sup>1</sup>H NMR), as well as comparison of crystal structures using X-ray diffraction (XRD) are performed. The experimental results demonstrate that an increase in the stirring rate leads to a more homogeneous molecular distribution within the reaction system, thereby facilitating molecular contact polycondensation and promoting mesophase growth and development. Furthermore, the pressurized-atmospheric two-stage reaction process also contributes to mesophase development, resulting in products with more cycloalkane structure, improved thermal stability, and optimized optical structure transitioning from mosaic to flow or even domain.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141373853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Enhancement of nitric oxide reduction via CeZrOx/Cu-SSZ-39 hybrid catalyst: Improving activity and hydrothermal stability","authors":"Yunhui Li, Kunting Li, Xingdong Zhu, Xinyan Zhang, Xin Zhang","doi":"10.1002/apj.3109","DOIUrl":"10.1002/apj.3109","url":null,"abstract":"<p>This study aimed to improve the catalytic activity and hydrothermal stability of Cu-SSZ-39 zeolite by coupling it with cerium zirconium oxides (CeZrO<sub>x</sub>), which possesses excellent oxidizing ability, and a hybrid catalyst CeZrO<sub>x</sub>/Cu-SSZ-39 was prepared. It is found that it exhibited enhanced low-temperature activity, high-temperature activity, and a wider effective temperature range compared to Cu-SSZ-39. Characterization results showed that the CeZrO<sub>x</sub>/Cu-SSZ-39 catalyst had a higher concentration of active Cu<sup>2+</sup> ion species and improved redox properties, which could potentially promote the NH<sub>3</sub>-SCR reaction. Additionally, the CeZrO<sub>x</sub>/Cu-SSZ-39 catalyst had increased chemisorbed oxygen species on its surface, facilitating the oxidation of NO to NO<sub>2</sub> and enhancing the rate of the SCR reaction. Moreover, even after undergoing hydrothermal aging treatment, the CeZrO<sub>x</sub>/Cu-SSZ-39 catalyst exhibited superior catalytic activity and improved hydrothermal stability, surpassing the performance of Cu-SSZ-39. It is found the CeZrO<sub>x</sub> coupling allowed the hybrid catalyst to maintain a better specific surface area and pore structure during hydrothermal aging, resulting in reduced activity loss. Therefore, the addition of CeZrO<sub>x</sub> enhanced the NH<sub>3</sub>-SCR activity of Cu-SSZ-39 zeolite, leading to improved catalytic activity and hydrothermal stability. CeZrO<sub>x</sub>/Cu-SSZ-39 catalyst has shown promising aspect for reducing NOx emissions from diesel vehicle exhaust.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Resistance characteristics and particle movement behavior of a petroleum coke particle packed bed in a vertical shaft calciner under different burden distribution methods","authors":"Jindi Huang, Hui Lu, Jing Li, Youming Yang","doi":"10.1002/apj.3105","DOIUrl":"10.1002/apj.3105","url":null,"abstract":"<p>Because of the increasingly deteriorating quality of petroleum coke raw materials, abnormal furnace conditions, such as “firing and blasting”, frequently arise during the calcination of petroleum coke with a high powder/coke ratio in a vertical shaft calciner. This poses an urgent technical challenge that needs to be addressed. In iron and steel metallurgy, the burden distribution system is an important way to regulate blast furnace conditions and improve the permeability of a particle packed bed. In this work, advanced burden distribution concepts were introduced into the calcination process of petroleum coke in a vertical shaft calciner. Experimental devices were established to determine the resistance characteristics of a petroleum coke particle packed bed, along with a cold physical model of a 1/8 scale vertical shaft calciner. The influence of particle size and burden distribution methods on the resistance characteristics and particle motion behavior of the petroleum coke particle packed bed was systematically studied. The research findings indicate that both particle size and burden distribution methods significantly impact the resistance characteristics of petroleum coke particle packed beds. The smaller the particle size, the poorer the permeability of the bed. The layered burden distribution, symmetrical burden distribution, and dual-particle mixed conventional burden distribution all contribute to improving the permeability of the petroleum coke particle packed bed in the vertical shaft calciner. Furthermore, employing symmetrical burden distribution in Bed-3, which is packed with petroleum coke particles of diameters −3.2 + 2.5 mm and −1.0 + 0.8 mm, results in the smallest unit pressure drop, at only 1.7% of that of the conventional burden distribution of unscreened raw materials. This is the most effective means of improving the permeability of the bed. During the discharging process, particle size and symmetrical burden distribution have no significant impact on the motion characteristics of petroleum coke particles in the vertical shaft calciner. In general, in the calciner area, particles primarily move in a plug flow pattern and gradually transform into funnel flow in the cooling water jacket area. These research results provide the theoretical basis for addressing the technical challenges associated with powder coke calcination in vertical shaft calciners through reasonable burden distribution methods for fine and coarse particles.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiangsen Shao, Chenliang Peng, Guanshi Wang, Lei Qin, Ping Long
{"title":"Adsorption behavior of NH4+ and Mg2+ at kaolinite surfaces: Effect of the ion concentration, NH4+/Mg2+ mixing ratio, and layer charge","authors":"Xiangsen Shao, Chenliang Peng, Guanshi Wang, Lei Qin, Ping Long","doi":"10.1002/apj.3106","DOIUrl":"10.1002/apj.3106","url":null,"abstract":"<p>The adsorption behavior of NH<sub>4</sub><sup>+</sup> and Mg<sup>2+</sup> at kaolinite surfaces was investigated by using molecular dynamics (MD) simulations, considering the factors such as ion concentration, NH<sub>4</sub><sup>+</sup>/Mg<sup>2+</sup> mixing ratio, and layer charge of kaolinite. The results showed that the increase in ion concentration did not affect the adsorption modes of NH<sub>4</sub><sup>+</sup> and Mg<sup>2+</sup> ions but promote the increase in the adsorption capacity. The total adsorption capacities of Mg<sup>2+</sup> and NH<sub>4</sub><sup>+</sup> were 3.25 × 10<sup>−6</sup> and 2.85 × 10<sup>−6</sup> μmol·mm<sup>−2</sup> at the ion concentration of 1.5 mol·L<sup>−1</sup>, respectively. When NH<sub>4</sub><sup>+</sup> and Mg<sup>2+</sup> were co-adsorbed, they could inhibit the adsorption of each other at the surface of kaolinite, except that the inner-sphere (IS) adsorption of NH<sub>4</sub><sup>+</sup> at aluminum hydroxyl (Al–OH) surface could be enhanced by the presence of Mg<sup>2+</sup>. Both NH<sub>4</sub><sup>+</sup> and Mg<sup>2+</sup> tended to adsorb at the siloxane (Si–O) surface of kaolinite rather than Al–OH surface. When layer charge occurred in kaolinite, a small number of Mg<sup>2+</sup> began to adsorb in the IS complexes at 1.7 and 2.3 Å above the Al and O atoms of the lattice-substituted tetrahedra of the Si–O surface, and at 1.7 Å above the hexahedra of the Al–OH surface. However, most of NH<sub>4</sub><sup>+</sup> were adsorbed in IS complexes at 1.7 Å above the center of the oxygen six-membered ring of the Si–O surface and above the hexahedron of the Al–OH surface. The adsorption capacity of Mg<sup>2+</sup> changed little with the increase of layer charge density, while the IS and total adsorption capacity of NH<sub>4</sub><sup>+</sup> increased significantly.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hong Jiang, Qingsong Liu, Ling Zhou, Penggang Zhang, Peng Gao, Chen Xiao, Donglei Yang
{"title":"Heat integration analysis based on recycle split vapor ethane recovery process","authors":"Hong Jiang, Qingsong Liu, Ling Zhou, Penggang Zhang, Peng Gao, Chen Xiao, Donglei Yang","doi":"10.1002/apj.3107","DOIUrl":"10.1002/apj.3107","url":null,"abstract":"<p>Recovering ethane from natural gas involves significant energy consumption. Globally, the recycle split vapor process (RSV) is widely adopted as an efficient method for ethane recovery. Nonetheless, one major challenge faced by the RSV process is the lack of adequate heat integration, despite its overall effectiveness. In this article, we investigate the heat integration of the RSV process and propose two novel ethane recovery processes: the recycle split vapor process with direct heat integration of the feed gas (RSV-DTI) and the recycle split vapor process with split heat integration of the feed gas (RSV-SHI). A comparative analysis is conducted among these three processes, focusing on integrated energy consumption, exergy efficiency, and economic investment. The study's findings reveal the following: (1) The RSV-DTI process distinguishes itself with its reduced energy consumption, enhanced stability, and minimized refrigerant usage. In comparison to the RSV process, the RSV-DTI process achieves a reduction of over 15% in total compression duty and a remarkable decrease of 68% in propane usage. (2) Electricity emerges as the predominant energy consumed in the ethane recovery process, and the RSV-DTI process significantly improves upon this aspect. Notably, the RSV-DTI process incurs the lowest investment cost, yielding a swift payback period of approximately 1 year for the plant. The characteristics of the RSV-DTI process are investigated, and the effect of changes in feed gas conditions on the heat integration of the RSV-DTI process is analyzed. The characteristics of the RSV-DTI process show the following: (1) Different pressures of feed gas existing in the main cold box have different minimum heat integration temperatures (MHIT). When the feed gas temperature is lower than the MHIT, heat integration becomes difficult, and the heat energy can be supplied by hot liquid propane at 48°C. When the feed gas temperature is higher than the MHIT, changes in feed gas temperature have little effect on the process, only affecting the external gas temperature. (2) The heat transfer duty of the demethanizer sideline outlet stream is affected by the feed gas pressure. To enhance heat integration, it is recommended to set the heat transfer duty of the low-temperature sideline outlet stream (DLTSS) between 40% and 90% of the reboiler duty and the heat transfer duty of the high-temperature sideline outlet stream (DHTSS) between 40% and 75% of the reboiler duty.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ajay V. Gawali, Surendra Sasikumar Jampa, Manish Kumar Sinha
{"title":"Synthesis and characterization of mixed matrix membranes with graphene oxide-impregnated zeolitic imidazolate framework-8 for enhanced CO2/CH4 separation","authors":"Ajay V. Gawali, Surendra Sasikumar Jampa, Manish Kumar Sinha","doi":"10.1002/apj.3094","DOIUrl":"10.1002/apj.3094","url":null,"abstract":"<p>For the in situ growth method, the reaction time is important because increasing the reaction time may make it possible for the crystallized ZIF-8 to fully cover the GO sheets; the excess of ZIF-8 particles reduces the aspect ratio of the GO sheet. The reaction time will significantly change the morphology, affecting the composite's ability to absorb selective gas and, in turn, affect the gas selectivity. The present work identifies the reaction time for in situ growth of ZIF-8 nanoparticles on GO sheets. The composite was synthesized at different reaction times of 2, 4, 6, and 8 h and incorporated into the PSF matrix. The fabricated membranes were characterized by FTIR, TGA, SEM, and XRD. The novel synthesized reaction time (6 h) was identified for better enhancement of CO<sub>2</sub>/CH<sub>4</sub> separation. For pure gas studies, the results investigated that the CO<sub>2</sub> permeability and CO<sub>2</sub>/CH<sub>4</sub> selectivity were increased by 223% and 98%, respectively, compared with plain PSF membrane. In mixed gas (CO<sub>2</sub>/CH<sub>4</sub>) studies, the CO<sub>2</sub> permeability and CO<sub>2</sub>CH<sub>4</sub> selectivity were increased by 349% and 854%, respectively, compared with plain PSF membrane. Hence, the in situ growth method helps synthesize MOF@GO composites in the application of gas separation.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141109959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kai Yuan, Ye Sun, Yangfeng Peng, Yongming Wei, Yanyang Wu, Quan He
{"title":"Selective adsorption and separation of salicylic acid and 4-hydroxyisophthalic acid from industry-grade 4-hydroxybenzoic acid on UiO-66","authors":"Kai Yuan, Ye Sun, Yangfeng Peng, Yongming Wei, Yanyang Wu, Quan He","doi":"10.1002/apj.3103","DOIUrl":"10.1002/apj.3103","url":null,"abstract":"<p>In this study, UiO-66 was employed for the first time as an adsorbent to separate phenolic acid analogues, specifically 4-hydroxyisophthalic acid and salicylic acid, from impurities. Synthesized in-house, UiO-66 was shown to exhibit high selectivity towards 4-HIPA/4-HBA and SA/4-HBA when a molar equivalent of acetic acid modulator to terephthalic acid was set at 44. The adsorption capacities for 4-HBA, 4-HIPA, and SA were determined to be 56.34, 55.02, and 60.34 mg/g, respectively. Furthermore, it was observed that after six regeneration cycles, the adsorption capacity for 4-HBA remained nearly unchanged, whereas those for 4-HIPA and SA decreased by 5.6% and 2.6%, respectively. FTIR and XPS analyses revealed that all three compounds were adsorbed at the same dominant Zr cluster site on UiO-66, primarily through hydrogen bonding and electrostatic interaction. Dynamic adsorption experiments revealed that 4-HBA was the first to elute, maintaining the residual contents of 4-HIPA and SA below 0.1 wt%. Compared to traditional separation techniques, this paper provided a simple and effective method to purify industrial grade 4-hydroxybenzoic acid.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141112628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vadim A. Eremin, Maxim V. Ananyev, Anton A. Solodyankin, Alexander A. Markin
{"title":"Degradation of iron-nickel alloy interconnects in contact with lanthanum nickelates based double-layer electrodes during long-term tests","authors":"Vadim A. Eremin, Maxim V. Ananyev, Anton A. Solodyankin, Alexander A. Markin","doi":"10.1002/apj.3091","DOIUrl":"10.1002/apj.3091","url":null,"abstract":"<p>This paper focuses on long-term tests held during 1,000 h on different Membrane-Electrode-Interconnect Assemblies (MEIAs), consisting of an Fe-Ni alloy interconnect and an electrochemical cell based on a Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>2–δ</sub> electrolyte, the double-layer working electrode with a La<sub>2</sub>NiO<sub>4 + δ</sub> – Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>2–δ</sub> composite functional layer, and a LaNi<sub>0.6</sub>Fe<sub>0.4</sub>O<sub>3–δ</sub> current collector layer, and a platinum reference electrode (O<sub>2</sub>, LaNi<sub>0.6</sub>Fe<sub>0.4</sub>O<sub>3–δ</sub>|La<sub>2</sub>NiO<sub>4 + δ</sub> – Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>2–δ</sub>|Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>2–δ</sub>|Pt, O<sub>2</sub>). These tests were carried out on MEIAs with the Cr-free 47ND alloy of the Fe–Ni system with and without surface modification at 850°C in air. The electrochemical performance of MEIAs was studied without polarization as well as under cathodic and anodic polarization with current density 0.5 A cm<sup>−2</sup> by means of electrochemical impedance spectroscopy (EIS). The mechanism of the MEIA evolution during long-term test is discussed.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}