Frontiers of Chemical Science and Engineering最新文献_第8页

Enhanced photocatalytic N2 fixation using KNbO3/Bi4O5Br2 type II heterojunction 利用 KNbO3/Bi4O5Br2 II 型异质结增强光催化 N2 固定能力

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-20 DOI: 10.1007/s11705-024-2424-2

Lin Yue, Zhihao Zeng, Xujie Ren, Shude Yuan, Chuanqi Xia, Xin Hu, Leihong Zhao, Lvchao Zhuang, Yiming He

{"title":"Enhanced photocatalytic N2 fixation using KNbO3/Bi4O5Br2 type II heterojunction","authors":"Lin Yue, Zhihao Zeng, Xujie Ren, Shude Yuan, Chuanqi Xia, Xin Hu, Leihong Zhao, Lvchao Zhuang, Yiming He","doi":"10.1007/s11705-024-2424-2","DOIUrl":"10.1007/s11705-024-2424-2","url":null,"abstract":"<div><p>The fabrication of heterojunction catalysts is an effective strategy to enhance charge separation efficiency, thus boosting the performance of photocatalysts. This work presents the synthesis and investigation of a novel KNbO<sub>3</sub>/Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> heterostructure catalyst for photocatalytic N<sub>2</sub>–to–NH<sub>3</sub> conversion under light illumination. While morphology analysis revealed KNbO<sub>3</sub> microcubes embedded within Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> nanosheets, the composite exhibited no significant improvement in specific surface area or optical property compared to Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> due to the relatively wide band gap and low surface area of KNbO<sub>3</sub>. The main contribution lies in the enhanced separation efficiency of photogenerated electrons and holes. Besides, the band structure analysis suggests that KNbO<sub>3</sub> and Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> exhibit suitable band potentials to form a type II heterojunction. Benefiting from the higher Fermi level of KNbO<sub>3</sub> than Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>, the electron drift at the contact region thus occurs and leads to the formation of a built-in electric field with the direction from KNbO<sub>3</sub> to Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>, accelerating electron migration and improving the operational efficiency of the photocatalysts. Consequently, the KNbO<sub>3</sub>/Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> catalyst shows an increased photoactivity, achieving an NH<sub>3</sub> generation rate 1.78 and 1.58 times those of KNbO<sub>3</sub> and Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>, respectively. This work may offer valuable insights for the design and synthesis of heterojunction composite photocatalysts.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 6","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141120948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Bimetallic reduced graphene oxide/zeolitic imidazolate framework hybrid aerogels for efficient heavy metals removal 用于高效去除重金属的双金属还原氧化石墨烯/唑基咪唑啉框架杂化气凝胶

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-20 DOI: 10.1007/s11705-024-2442-0

Nurul A. Mazlan, Allana Lewis, Fraz Saeed Butt, Rajakumari Krishnamoorthi, Siyu Chen, Yi Huang

{"title":"Bimetallic reduced graphene oxide/zeolitic imidazolate framework hybrid aerogels for efficient heavy metals removal","authors":"Nurul A. Mazlan, Allana Lewis, Fraz Saeed Butt, Rajakumari Krishnamoorthi, Siyu Chen, Yi Huang","doi":"10.1007/s11705-024-2442-0","DOIUrl":"10.1007/s11705-024-2442-0","url":null,"abstract":"<div><p>Graphene oxide is a promising adsorption material. However, it has been difficult to recycle and separate graphene oxide in the solution. To alleviate this problem, graphene oxide was thermally reduced to produce porous hydrogel which was then functionalized with polydopamine. The functional groups act as not only adsorption sites but also nucleation sites for <i>in situ</i> crystallization of cobalt-doped zeolitic-imidazolate-framework-8 nano-adsorbents. The effects of cobalt-doping contents on the physicochemical and adsorption properties of the resulting aerogel were also evaluated by varying the cobalt concentration. For instance, the reduced graphene oxide-polydopamine/50cobalt-zeolitic-imidazolate-framework-8 aerogel exhibited a high surface area of 900 m<sup>2</sup>·g<sup>−1</sup> and maintained the structure in water after ten days. The assynthesized aerogels showed an ultrahigh adsorption capacity of 1217 ± 24.35 mg·g<sup>−1</sup> with a removal efficiency of > 99% of lead, as well as excellent adsorption performance toward other heavy metals, such as copper and cadmium with adsorption capacity of 1163 ± 34.91 and 1059 ± 31.77 mg·g<sup>−1</sup>, respectively. More importantly, the lead adsorption stabilized at 1023 ± 20.5 mg·g<sup>−1</sup> with a removal efficiency of > 80% after seven cycles, indicating their potential in heavy metal removal from industrial wastewater.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11705-024-2442-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solid-conversion synthesis of three-dimensionally ordered mesoporous ZSM-5 catalysts for the methanol-to-propylene reaction 固体转化合成用于甲醇制丙烯反应的三维有序介孔 ZSM-5 催化剂

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-20 DOI: 10.1007/s11705-024-2446-9

Weilong Chun, Chenbiao Yang, Xu Wang, Xin Yang, Huiyong Chen

{"title":"Solid-conversion synthesis of three-dimensionally ordered mesoporous ZSM-5 catalysts for the methanol-to-propylene reaction","authors":"Weilong Chun, Chenbiao Yang, Xu Wang, Xin Yang, Huiyong Chen","doi":"10.1007/s11705-024-2446-9","DOIUrl":"10.1007/s11705-024-2446-9","url":null,"abstract":"<div><p>A facile synthesis of hierarchical ZSM-5 with the three-dimensionally ordered mesoporosity (3DOm ZSM-5) was achieved by solid conversion (SC) of SiO<sub>2</sub> colloidal crystals to high-crystalline ZSM-5. The products of 3DZ5_S/C and 3DZ5_S, which were severally transformed from the carbon-padded SiO<sub>2</sub> colloidal crystals and the initial SiO<sub>2</sub> colloidal crystals, exhibited not only a similar ordered structure and acidity but also higher crystallinity and more balanced meso-/micropore combination in comparison with 3DZ5_C obtained by the conventional confined space crystallization approach. All three synthesized 3DZ5 catalysts showed improved methanol-to-propylene performance than the commercially microporous ZSM-5 (CZ5), embodied in five times longer lifetime, higher propylene selectivity and <i>S</i><sub>propylene</sub>/<i>S</i><sub>ethylene</sub> ratio (<i>P/E</i>), and superior coke toleration with lower formation rate of coke (<i>R</i><sub>coke</sub>). Moreover, the 3DZ5_S catalyst <i>in situ</i> converted from SiO<sub>2</sub> colloidal crystals presented the highest selectivities of propylene (42.51%) and light olefins (74.6%) among all three 3DZ5 catalysts. The high efficiency in synthesis and <i>in situ</i> utilization of SiO<sub>2</sub> colloidal crystals demonstrate the proposed SC strategy to be more efficiently and eco-friendly for the high-yield production of not only 3DOm ZSM-5 but also other types of hierarchical zeolites.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 8","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Zinc(II) metal-organic framework eluting titanium implant as propulsive agent to boost the endothelium regeneration 锌（II）金属有机框架洗脱钛植入物作为促进内皮再生的推进剂

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-17 DOI: 10.1007/s11705-024-2428-y

Wen Liu, Xiaoyu Wang, Ying Li, Shihai Xia, Wencheng Zhang, Yakai Feng

{"title":"Zinc(II) metal-organic framework eluting titanium implant as propulsive agent to boost the endothelium regeneration","authors":"Wen Liu, Xiaoyu Wang, Ying Li, Shihai Xia, Wencheng Zhang, Yakai Feng","doi":"10.1007/s11705-024-2428-y","DOIUrl":"10.1007/s11705-024-2428-y","url":null,"abstract":"<div><p>The advent of antiproliferative drug-eluting vascular stents can dramatically reduce in-stent restenosis via inhibiting the hyperproliferation of vascular smooth muscle cells. However, the antiproliferative drugs also restrain the repair of the injured endothelial layer, which in turn leads to the very later in-stent restenosis. Evidence points that competent endothelium plays a critical role in guaranteeing the long-term patency via maintaining vascular homeostasis. Boosting the regeneration of endothelium on the implanted vascular stents could be rendered as a promising strategy to reduce stent implantation complications. In this regard, bioactive zinc(II) metal-organic framework modified with endothelial cell-targeting Arg-Glu-Asp-Val peptide was embedded in poly(lactide-co-caprolactone) to serve as a functional coating on the surface of titanium substrate, which can promote the proliferation and migration of endothelial cells. The <i>in vitro</i> cell experiments revealed that the zinc(II) metal-organic framework embedded in the polymer coating was able to modulate the behaviors of endothelial cells owing to the bioactive effects of zinc ion and peptide. Our results confirmed that zinc(II) metal-organic framework eluting coating represented a new possibility for promoting the repair of the damaged endothelium with potential clinical implications in vascular-related biomaterials and tissue engineering applications.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 6","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical study on the effect of H2O on the formation mechanism of NOx precursors during indole pyrolysis 关于 H2O 对吲哚热解过程中氮氧化物前体形成机制影响的理论研究

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-17 DOI: 10.1007/s11705-024-2425-1

Ziqi Wang, Jun Shen, Xuesong Liu, Sha Wang, Shengxiang Deng, Hai Zhang, Yun Guo

{"title":"Theoretical study on the effect of H2O on the formation mechanism of NOx precursors during indole pyrolysis","authors":"Ziqi Wang, Jun Shen, Xuesong Liu, Sha Wang, Shengxiang Deng, Hai Zhang, Yun Guo","doi":"10.1007/s11705-024-2425-1","DOIUrl":"10.1007/s11705-024-2425-1","url":null,"abstract":"<div><p>The incineration technology of kitchen waste is one of the effective technologies to achieve the resource utilization of municipal solid waste. Pyrolysis is an important stage of incineration. Indole is a rich initial product in the pyrolysis process of kitchen waste, and the presence of H<sub>2</sub>O has a significant impact on the decomposition of indole to form NO<sub><i>x</i></sub> precursors. Therefore, this study uses density functional theory method to study the effect of H<sub>2</sub>O on the thermal decomposition of indole to produce NH<sub>3</sub>, HNCO, and HCN. When H<sub>2</sub>O participates in the reaction, it can provide oxidative groups to generate a new product HNCO, which is different from the previous findings by indole pyrolysis without the presence of H<sub>2</sub>O. Meanwhile, this study theoretically proves that NH<sub>3</sub> is easier to form than HCN. This is consistent with the phenomenon that NH<sub>3</sub> release is higher than HCN release in pyrolysis experiment. In addition, compared with the individual pyrolysis of indole, the participation of H<sub>2</sub>O reduces the energy barriers for the formation of NH<sub>3</sub> and HCN during indole pyrolysis, thereby promoting the formation of NH<sub>3</sub> and HCN.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 6","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constructing hierarchical ZSM-5 coated with small ZSM-5 crystals via oriented-attachment and in situ assembly for methanol-to-aromatics reaction 通过定向附着和原位组装技术构建涂有小 ZSM-5 晶体的分层 ZSM-5，用于甲醇制芳烃反应

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-15 DOI: 10.1007/s11705-024-2432-2

Ning Yang, Tingjun Fu, Chuntao Cao, Xueqing Wu, Huiling Zheng, Zhong Li

{"title":"Constructing hierarchical ZSM-5 coated with small ZSM-5 crystals via oriented-attachment and in situ assembly for methanol-to-aromatics reaction","authors":"Ning Yang, Tingjun Fu, Chuntao Cao, Xueqing Wu, Huiling Zheng, Zhong Li","doi":"10.1007/s11705-024-2432-2","DOIUrl":"10.1007/s11705-024-2432-2","url":null,"abstract":"<div><p>Developing hierarchical and nanoscale ZSM-5 catalysts for diffusion-limited reactions has received ever-increasing attention. Here, ZSM-5 architecture integrated with hierarchical pores and nanoscale crystals was successfully prepared via <i>in situ</i> self-assembly of nanoparticles-coated silicalite-1. First, the oriented attachment of amorphous nanoparticles on external surface of silicalite-1 was achieved by controlling the alkalinity of Si-Al coating solution. The partial exposure of the external surface of silicalite-1 ensured the uniform removal of silicon in the bulk phase for the creation of hierarchical pores during the subsequent desilication-recrystallization. The uniform removal of silicon species in the bulk phase was mainly due to the synergistic effect of surface protection and alkaline etching, which could be balanced by regulating the relative amount of tetrapropylammonium cation and OH<sup>−</sup> in desilication-recrystallization solution. Importantly, the removed silicon from silicalite-1 recrystallized and <i>in situ</i> assembled into final ZSM-5 nanocrystals induced by surface Si-Al nanoparticles. The hierarchical pores and nanoscale crystals on this integrated architecture not only promoted the removal of coke precursors from micropores but also provided large external specific surface (91 m<sup>2</sup>·g<sup>−1</sup>) for coke deposition. Consequently, a much longer catalytic lifetime was achieved for methanol-to-aromatics reaction compared to conventional hollow structure ZSM-5 (84 h <i>vs</i> 46 h), with relatively high stability.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 7","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of catalyst surface-active sites in the hydrogenation of α,β-unsaturated aldehyde 催化剂表面活性点在α、β-不饱和醛氢化过程中的作用

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-15 DOI: 10.1007/s11705-024-2423-3

Haixiang Shi, Tongming Su, Zuzeng Qin, Hongbing Ji

{"title":"Role of catalyst surface-active sites in the hydrogenation of α,β-unsaturated aldehyde","authors":"Haixiang Shi, Tongming Su, Zuzeng Qin, Hongbing Ji","doi":"10.1007/s11705-024-2423-3","DOIUrl":"10.1007/s11705-024-2423-3","url":null,"abstract":"<div><p>As an important technology in fine chemical production, the selective hydrogenation of <i>α</i>,<i>β</i>-unsaturated aldehydes has attracted much attention in recent years. In the process of <i>α</i>,<i>β</i>-unsaturated aldehyde hydrogenation, a conjugated system is formed between >C=C< and >C=O, leading to hydrogenation at both ends of the conjugated system, which competes with each other and results in more complex products. Therefore, improving the reaction selectivity is also difficult in industrial fields. Recently, many researchers have reported that surface-active sites on catalysts play a crucial role in <i>α</i>,<i>β</i>-unsaturated aldehyde hydrogenation. This review attempts to summarize recent advances in understanding the effects of surface-active sites (SASs) over metal catalysts for enhancing the process of hydrogenation. The construction strategies and roles of SASs for hydrogenation catalysts are summarized. Particular attention has been given to the adsorption configuration and transformation mechanism of <i>α</i>,<i>β</i>-unsaturated aldehydes on catalysts, which contributes to understanding the relationship between SASs and hydrogenation activity. In addition, recent advances in metal-supported catalysts for the selective hydrogenation of <i>α</i>,<i>β</i>-unsaturated aldehydes to understand the role of SASs in hydrogenation are briefly reviewed. Finally, the opportunities and challenges will be highlighted for the future development of the precise construction of SASs.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 6","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Degradation pathways of amino acids during thermal utilization of biomass: a review 生物质热利用过程中氨基酸的降解途径：综述

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-15 DOI: 10.1007/s11705-024-2433-1

Mubarak Al-Kwradi, Mohammednoor Altarawneh

{"title":"Degradation pathways of amino acids during thermal utilization of biomass: a review","authors":"Mubarak Al-Kwradi, Mohammednoor Altarawneh","doi":"10.1007/s11705-024-2433-1","DOIUrl":"10.1007/s11705-024-2433-1","url":null,"abstract":"<div><p>Amino acids are important nitrogen carriers in biomass and entail a broad spectrum of industrial uses, most notably as food additives, pharmaceutical ingredients, and raw materials for bio-based plastics. Attaining detailed information in regard to the fragmentation of amino acids is essential to comprehend the nitrogen transformation chemistry at conditions encountered during hydrothermal and pyrolytic degradation of biomass. The underlying aim of this review is to survey literature studies pertinent to the complex structures of amino acids, their formation yields from various categories of biomass, and their fragmentation routes at elevated temperatures and in the aqueous media. Two predominant degradation reactions ensue in the decomposition of amino acids, namely deamination and decarboxylation. Notably, minor differences in structure can greatly affect the fate for each amino acid. Moreover, amino acids, being nitrogen-rich compounds, play pivotal roles across various fields. There is a growing interest in producing varied types and configurations of amino acids. Microbial fermentation appears to a viable approach to produce amino acids at an industrial scale. One innovative method under investigation is catalytic synthesis using renewable biomass as feedstocks. Such a method taps into the inherent nitrogen in biomass sources like chitin and proteins, eliminating the need for external nitrogen sources. This environmentally friendly approach is in line with green chemistry principles and has been gathering momentum in the scientific community.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 7","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coal-based activated carbon prepared by H2O activation process for supercapacitors using response surface optimization method 利用响应面优化法通过 H2O 活化工艺制备用于超级电容器的煤基活性炭

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-15 DOI: 10.1007/s11705-024-2422-4

Shanxin Xiong, Fengyan Lv, Chenxu Wang, Nana Yang, Yukun Zhang, Qingyong Duan, Shuaishuai Bai, Xiaoqin Wang, Zhen Li, Jianwei Xu

{"title":"Coal-based activated carbon prepared by H2O activation process for supercapacitors using response surface optimization method","authors":"Shanxin Xiong, Fengyan Lv, Chenxu Wang, Nana Yang, Yukun Zhang, Qingyong Duan, Shuaishuai Bai, Xiaoqin Wang, Zhen Li, Jianwei Xu","doi":"10.1007/s11705-024-2422-4","DOIUrl":"10.1007/s11705-024-2422-4","url":null,"abstract":"<div><p>The scalable production of high grade activated carbon from abundant coal for supercapacitors application is an efficient way to achieve high value-added utilization of coal sources. However, this technology is challenging due to lack of comprehensive understanding on the mechanism of activation process and effect of external factors. In this paper, the effect of activating temperature and time on the specific capacitance of coal-based activated carbon prepared by H<sub>2</sub>O steam activation was studied using the response surface method. Under optimal conditions, coal-based activated carbon exhibits the largest specific capacitance of 194.35 F·g<sup>−1</sup>, thanks to the appropriate pore/surface structure and defect degree. Density functional theory calculations explain in detail the mechanism of contraction of aromatic rings and overflow of H<sub>2</sub> and CO during the activation. Meanwhile, oxygen-containing functional groups are introduced, contributing to the pseudocapacitance property of coal-based activated carbon. This mechanism of reactions between aromatic carbon and H<sub>2</sub>O vapor provides understanding on the role of water during coal processing at the molecular level, offering great potential to regulate product distribution and predict rate of pore generation. This insight would contribute to the advancement of other coal processing technology such as gasification.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":571,"journal":{"name":"Frontiers of Chemical Science and Engineering","volume":"18 6","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Segregation of binary particles in gas-solid fluidized bed 气固流化床中二元颗粒的分离

IF 4.3 3区工程技术

Frontiers of Chemical Science and Engineering Pub Date : 2024-05-09 DOI: 10.1007/s11705-024-2426-0

Yaxiong Yu, Feng Lu, Xuan He, Fei Wei, Chenxi Zhang

引用次数: 0