催化剂现代研究(英文)Pub Date : 2019-04-29DOI: 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":" ","pages":""},"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}
催化剂现代研究(英文)Pub Date : 2019-01-30DOI: 10.4236/MRC.2019.81001
L. Gogin, E. Zhizhina, Z. P. Pai
{"title":"One-Pot Process of Naphthoquinones Synthesis from Hydroquinone in the Presence of Solutions of Mo-V-P Heteropolyacids as Bifunctional Catalysts","authors":"L. Gogin, E. Zhizhina, Z. P. Pai","doi":"10.4236/MRC.2019.81001","DOIUrl":"https://doi.org/10.4236/MRC.2019.81001","url":null,"abstract":"1,4-Naphthoquinones (NQ) is a class of organic compounds with a number of important properties. However, the existing methods of their synthesis either give a low NQ yield or multistage and require a lot of time. In the present work new one-pot process of NQ synthesis from hydroquinone (HQ) and substituted 1,3-dienes at room temperature is proposed. The solution of heteropolyacid H7PMo8V4O40 (HPA-4) is used as a bifunctional (acid and redox) catalyst for this process. The influence of a number of factors on key process parameters has been studied. It is demonstrated that unsubstituted and a number of alkyl substituted NQ with the yields of 50% - 80% and purity of 92% - 99% can be obtained by this method. The results obtained allow to significantly simplify the synthesis of NQ directly from HQ in comparison with the described similar methods.","PeriodicalId":60845,"journal":{"name":"催化剂现代研究(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48536500","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}