催化剂现代研究(英文) Pub Date : 2023-01-01 DOI: 10.4236/mrc.2023.121001

Hiremarali Sathyanarayana Sindhushree, Kodenakoppalu Mahadevappa Chaithra, R. Radhika, B. Venkatesha

引用次数: 0

Ruthenium Catalyst Supported on Multi-Walled Carbon Nanotubes for CO Oxidation 用于CO氧化的多壁碳纳米管负载钌催化剂

催化剂现代研究(英文) Pub Date : 2021-07-26 DOI: 10.4236/mrc.2021.103005

C. E. Kozonoe, R. Giudici, M. Schmal

引用次数: 5

Monolithic Mesh-Type Fe-Pd/γ-Al2O3/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B Fe-Pd/γ-Al2O3/Al双功能电fenton催化剂降解罗丹明B

催化剂现代研究(英文) Pub Date : 2021-04-26 DOI: 10.4236/MRC.2021.102004

Qi Shao, Guiru Zhang, Linhui Lu, Qi Zhang

{"title":"Monolithic Mesh-Type Fe-Pd/γ-Al2O3/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B","authors":"Qi Shao, Guiru Zhang, Linhui Lu, Qi Zhang","doi":"10.4236/MRC.2021.102004","DOIUrl":"https://doi.org/10.4236/MRC.2021.102004","url":null,"abstract":"A novel Fe-Pd bifunctional catalyst supported on mesh-type γ-Al2O3/Al was prepared and applied in the degradation of Rhodamine B (RhB). The monolithic mesh-type Fe-Pd/γ-Al2O3/Al bifunctional catalyst could be separated from the solution directly and could synthesize H2O2 in situ. The characterization results showed that Fe could improve the dispersion of Pd0, and the electronic interactions between Pd and Fe could increase the Pd0 contents on the catalyst, which increased the productivity of H2O2. Furthermore, DFT calculations proved that the addition of Fe could inhibit the dissociation of O2 and promote the nondissociative hydrogenation of O2 on the surface of Fe-Pd/γ-Al2O3/Al, which resulted in the increasement of H2O2 selectivity. Finally, the in-situ synthesized H2O2 by Pd was furtherly decomposed in situ by Fe to generateOH radicals to degrade organic pollutants. Therefore, Fe-Pd/ γ-Al2O3/Al catalysts exhibited excellent catalytic activity in the in-situ synthesis of H2O2 and the degradation of RhB due to the synergistic effects between Pd and Fe on the catalyst. It provided a new idea for the design of bifunctional electro-Fenton catalysts. Ten cycles of experiments showed that the catalytic activity of Fe-Pd/γ-Al2O3/Al catalyst could be maintained for a long time.","PeriodicalId":60845,"journal":{"name":"催化剂现代研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43465230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Removal of the Methylene Blue Dye (MB) with Catalysts of Au-TiO2: Kinetic and Degradation Pathway Au-TiO2催化剂去除亚甲基蓝染料的动力学及降解途径

催化剂现代研究(英文) Pub Date : 2021-01-29 DOI: 10.4236/MRC.2021.101001

M. Arias, C. Aguilar, M. Piza, Elvira Zarazua, F. Anguebes, V. Cordova

引用次数: 8

Anticorrosion of WO3-Modified TiO2 Thin Film Prepared by Peroxo Sol-Gel Method 过氧化溶胶-凝胶法制备WO3改性TiO2薄膜的防腐性能

催化剂现代研究(英文) Pub Date : 2020-07-31 DOI: 10.4236/mrc.2020.93003

Jia-Ying Wu, Yu‐Wen Chen

{"title":"Anticorrosion of WO3-Modified TiO2 Thin Film Prepared by Peroxo Sol-Gel Method","authors":"Jia-Ying Wu, Yu‐Wen Chen","doi":"10.4236/mrc.2020.93003","DOIUrl":"https://doi.org/10.4236/mrc.2020.93003","url":null,"abstract":"The aim of this study was to develop a method to \u0000prepare WO3-TiO2 film which has high anticorrosion \u0000property when it was coated on type 304 stainless steel. A series of WO3-modified \u0000TiO2 sols were synthesized by peroxo-sol gel method using TiCl4 and Na2WO4 as the starting materials. TiCl4 was converted to Ti(OH)4 gel. H2O2 and Na2WO4 were added in Ti(OH)4 solution and heated at 95°C. The WO3-TiO2 sol was transparent, in neutral (pH~7) solution, stable suspension without \u0000surfactant, nano-crystallite and no annealing is needed after coating, and very \u0000stable for 2 years in stock. WO3-TiO2 sol was formed with \u0000anatase crystalline structure. These sols were characterized by XRD, TEM, and \u0000XPS. The sol was used to coat on stainless steel 304 by dip-coating. The WO3-TiO2 was anatase in structure as characterized by X-ray diffraction. There were no \u0000WO3 XRD peaks in the WO3-TiO2 sols, indicating \u0000that WO3 particles were very small, possibly incorporating into TiO2 structure, providing the amount of WO3 was very small. The TiO2 particles were rhombus shape. WO3-TiO2 had smaller size \u0000area than pure TiO2. The SEM results showed that the film coated on \u0000the glass substrate was very uniform. All films were nonporous and dense films. \u0000Its hardness reached 2 H after drying at 100°C, and reached 5 H after annealing \u0000at 400°C. The WO3-TiO2 film coated on 304 stainless steel \u0000had better anticorrosion capability than the unmodified TiO2 film \u0000under UV light illumination. The optimum weight ratio of TiO2: WO3 was 100:4.","PeriodicalId":60845,"journal":{"name":"催化剂现代研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49306674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Hydroxyl Enhanced Structured Pt/Nix/a-AlOOH Catalyst for Formaldehyde Oxidation at Room Temperature 羟基增强结构Pt/Nix/a-AlOOH催化剂室温氧化甲醛

催化剂现代研究(英文) Pub Date : 2020-04-13 DOI: 10.4236/mrc.2020.92002

Shou Zhao, Qi Zhang, G. Zhao, Yuhua Zhang

引用次数: 3

Pt Supported on Plasma-Chemical Titanium Nitride for Efficient Room-Temperature CO Oxidation 等离子体化学氮化钛负载Pt实现室温CO高效氧化

催化剂现代研究(英文) Pub Date : 2019-11-17 DOI: 10.4236/mrc.2022.111001

E. N. Kabachkov, E. N. Kurkin, N. N. Vershinin, I. L. Balikhin, V. Berestenko, A. Michtchenko, Y. Shulga

引用次数: 2

Effects of Co3O4 Cocatalyst on InTaO4 for Photocatalytic Reduction of CO2 to CH3OH under Visible Light Irradiation Co3O4助催化剂对InTaO4在可见光下光催化还原CO2制CH3OH的影响

催化剂现代研究(英文) Pub Date : 2019-10-30 DOI: 10.4236/mrc.2019.84004

Pei-Wen Pan, Yu‐Wen Chen, A. Brichkov, V. Kozik

{"title":"Effects of Co3O4 Cocatalyst on InTaO4 for Photocatalytic Reduction of CO2 to CH3OH under Visible Light Irradiation","authors":"Pei-Wen Pan, Yu‐Wen Chen, A. Brichkov, V. Kozik","doi":"10.4236/mrc.2019.84004","DOIUrl":"https://doi.org/10.4236/mrc.2019.84004","url":null,"abstract":"InTaO4 was synthesized by a solid-state reaction method using \u0000metal oxide as the starting materials. Co was added by incipient-wetness \u0000impregnation. The sample was pretreated by H2 (200 Torr) reduction \u0000at 500?C for 2 h and subsequent O2 (100 \u0000Torr) oxidation at 200?C for 1 \u0000h. The core-shell structure of metallic Co and Co3O4 was \u0000formed by this reduction-oxidation \u0000procedure. The catalysts were characterized by powder X-ray diffraction, \u0000scanning electron microscope, and ultraviolet-visible spectroscope. The \u0000photocatalytic reduction was carried out in a Pyrex reactor with KHCO3 or NaOH aqueous solution bubbled with ultra pure CO2 gas under \u0000visible light illumination. SEM micrographs show many small Co3O4 particles on the surface of InTaO4. The band gap of Co3O4-InTaO4 was 2.7 eV, confirming that these catalysts have the ability to reduce CO2 to methanol. The methanol yield increased with the amount of Co3O4 cocatalysts. The catalyst had a higher activity in KHCO3 aqueous \u0000solution than in NaOH solution. The InTaO4 catalyst with 1 wt% Co3O4 cocatalyst had the highest activity among all catalysts. Co3O4 was incorporate into the surface structure of InTaO4 to form CoxInTaO4-x. \u0000It resulted in more defect sites on the surface of InTaO4 and \u0000changed the valence band structure. It formed a Schottky barrier to suppress \u0000the electron-hole recombination.","PeriodicalId":60845,"journal":{"name":"催化剂现代研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47740360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A Comparison of Two Heterogeneous Catalysis Mechanisms 两种非均相催化机理的比较

催化剂现代研究(英文) Pub Date : 2019-07-31 DOI: 10.4236/mrc.2019.83003

Jiamin Jin

{"title":"A Comparison of Two Heterogeneous Catalysis Mechanisms","authors":"Jiamin Jin","doi":"10.4236/mrc.2019.83003","DOIUrl":"https://doi.org/10.4236/mrc.2019.83003","url":null,"abstract":"In this paper, two \u0000heterogeneous catalysis mechanisms are introduced, namely: Chemical \u0000Reaction Mode Cyclic Catalysis Mechanism—CRMM and Electron Orbital Deformation-Recovery Cyclic Catalysis \u0000Mechanism—EODRM (or Electron Cyclic Donate-Adopt catalysis Mechanism—ECDAM. A number of difficulties \u0000encountered by CRMM are listed. The author clearly points out that CRMM is not \u0000credible. This false theory has misled us for more than 100 years. About EODRM \u0000or ECDAM, the article also gives a brief description. The key point of EODRM or \u0000ECDAM is that catalysts do not participate in chemical reactions, and catalysis \u0000phenomena are physical rather than chemical phenomena. It’s completely \u0000different from CRMM. The theory contains three main points: 1) There is a demarcation between the catalyst and the \u0000poison; 2) The active size of the catalyst or the poison size \u0000of the poison is closely related to the electronegative size of the catalyst or \u0000poison; 3) The active size of catalyst is closely related to \u0000the chemical state. The selectivity of catalyst \u0000is related to energy level. Photocatalysis, electrocatalysis, laser catalysis \u0000and microwave catalysis are all physical phenomena. It has different energy \u0000levels. According to this theory, the author thinks that there are several \u0000problems worth studying in production and scientific research, such as: alumina in the Fe ammonia synthesis \u0000catalyst has a serious poison effect on the iron catalyst, resulting in three \u0000high situations in ammonia synthesis production (high temperature, high \u0000pressure, high energy consumption). The support materials of automotive exhaust \u0000purification catalyst have used Cordierite (2MgO-2Al2O3-5SiO2) \u0000ceramic honeycomb support, which has a serious poisoning effect on noble metal catalysts, \u0000a lot of noble metals are wasted, and so on. These problems have long been \u0000ignored by the catalytic academia; the author considers that this reason may be due to \u0000a misunderstanding or mistranslation on the term “catalysis” and “catalyst”.","PeriodicalId":60845,"journal":{"name":"催化剂现代研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43748415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanosized Au Catalysts Supported on Mg(OH)2-CeO2 for Preferential Oxidation of CO in Hydrogen Stream Mg(OH)2-CeO2负载的纳米Au催化剂在氢流中优先氧化CO

催化剂现代研究(英文) Pub Date : 2019-04-29 DOI: 10.4236/mrc.2019.82002

Yu‐Wen Chen, A. Brichkov, V. Kozik

{"title":"Nanosized Au Catalysts Supported on Mg(OH)2-CeO2 for Preferential Oxidation of CO in Hydrogen Stream","authors":"Yu‐Wen Chen, A. Brichkov, V. Kozik","doi":"10.4236/mrc.2019.82002","DOIUrl":"https://doi.org/10.4236/mrc.2019.82002","url":null,"abstract":"Preferential oxidation of carbon monoxide in the \u0000presence of hydrogen (PROX) is a promising method to \u0000remove CO from a hydrogen-containing gas mixture. Nanosized gold catalyst \u0000supported on CeO2 and modified with Mg(OH)2 was used for \u0000preferential oxidation of carbon monoxide in hydrogen-rich stream in this \u0000study. Mg(OH)2 was added on CeO2 by incipient-wetness \u0000impregnation. Au was loaded on Mg(OH)2-CeO2 by \u0000deposition-precipitation method. PROX reaction was carried out in a continuous \u0000flow, fixed bed reactor. CO/O2 feed ratio was fixed at 1 to magnify \u0000the difference of various catalysts. The catalysts were characterized by N2 sorption, TEM, HR-TEM and XPS. Mg(OH)2 formed a thin layer on the \u0000surface of CeO2. CeO2 was in the crystalline phase and \u0000Mg(OH)2 was amorphous. Au particles were homogeneously dispersed on \u0000the support with a size of 2 - 5 nm. Using CeO2 as a support could increase the dispersion of Mg(OH)2 and thus increase the \u0000interaction between Au and Mg(OH)2. Adding Mg(OH)2 on Au/CeO2 could \u0000suppress H2 oxidation and therefore increase CO oxidation activity.","PeriodicalId":60845,"journal":{"name":"催化剂现代研究(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43947193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

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