Wenjia Qu, Pengpeng Wei, Jingfang Li, Liye Liang, Liqiang Ma and Guangming Li
{"title":"Self-assembly of Dawson-type H6P2W18O62@[Cu6O(TZI)3(H2O)6]4 for high-performance aerobic oxidation desulfurization of fuel†","authors":"Wenjia Qu, Pengpeng Wei, Jingfang Li, Liye Liang, Liqiang Ma and Guangming Li","doi":"10.1039/D4DT01568A","DOIUrl":null,"url":null,"abstract":"<p >Because global sulfur emission has escalated, the development of high-efficiency deep desulfurization techniques has become imperative. Herein, to design a high-activity heterogeneous catalyst for the aerobic oxidation desulfurization (AODS) of fuel, Dawson-type polyoxometalate (H<small><sub>6</sub></small>P<small><sub>2</sub></small>W<small><sub>18</sub></small>O<small><sub>62</sub></small> abbreviated as D-P<small><sub>2</sub></small>W<small><sub>18</sub></small>), characterized by its high activity and strong oxidative capacity, was applied to react with CuCl<small><sub>2</sub></small>·2H<small><sub>2</sub></small>O and H<small><sub>3</sub></small>TZI <em>via</em> a one-pot hydrothermal method. Consequently, blue crystalline H<small><sub>6</sub></small>P<small><sub>2</sub></small>W<small><sub>18</sub></small>O<small><sub>62</sub></small><em>@</em>[Cu<small><sub>6</sub></small>O(TZI)<small><sub>3</sub></small>(H<small><sub>2</sub></small>O)<small><sub>6</sub></small>]<small><sub>4</sub></small> (abbreviated as D-P<small><sub>2</sub></small>W<small><sub>18</sub></small>@<em>rht</em>-MOF-1; <em>rht</em>-MOF-1 = [Cu<small><sub>6</sub></small>O(TZI)<small><sub>3</sub></small>(H<small><sub>2</sub></small>O)<small><sub>6</sub></small>]<small><sub>4</sub></small>·<em>n</em>H<small><sub>2</sub></small>O) was afforded. X-ray diffraction analysis indicated that D-P<small><sub>2</sub></small>W<small><sub>18</sub></small> was successfully encapsulated in two different cages of <em>rht</em>-MOF-1, which is distinct from the crystal structure of Keggin-type POMs@<em>rht</em>-MOF-1. It represents the first crystal structure of Dawson-type POMs@<em>rht</em>-MOF-1. When D-P<small><sub>2</sub></small>W<small><sub>18</sub></small>@<em>rht</em>-MOF-1 was employed as a catalyst for AODS under ambient oxygen pressure with the assistance of surfactant dioctadecyl dimethyl ammonium chloride (DODMAC), it demonstrated remarkable catalytic capability and recyclability for both model fuel and commercial diesel. Further, the AODS reaction mechanism, identified as a free radical oxidation–reduction process, was verified by way of radical quenching experiments, EPR and XPS analysis. This approach offers a feasible route for the synthesis of new Dawson-type POMs@MOFs of heterogeneous catalysts for highly active AODS of fuel.</p>","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Dalton Transactions","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/dt/d4dt01568a","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
Because global sulfur emission has escalated, the development of high-efficiency deep desulfurization techniques has become imperative. Herein, to design a high-activity heterogeneous catalyst for the aerobic oxidation desulfurization (AODS) of fuel, Dawson-type polyoxometalate (H6P2W18O62 abbreviated as D-P2W18), characterized by its high activity and strong oxidative capacity, was applied to react with CuCl2·2H2O and H3TZI via a one-pot hydrothermal method. Consequently, blue crystalline H6P2W18O62@[Cu6O(TZI)3(H2O)6]4 (abbreviated as D-P2W18@rht-MOF-1; rht-MOF-1 = [Cu6O(TZI)3(H2O)6]4·nH2O) was afforded. X-ray diffraction analysis indicated that D-P2W18 was successfully encapsulated in two different cages of rht-MOF-1, which is distinct from the crystal structure of Keggin-type POMs@rht-MOF-1. It represents the first crystal structure of Dawson-type POMs@rht-MOF-1. When D-P2W18@rht-MOF-1 was employed as a catalyst for AODS under ambient oxygen pressure with the assistance of surfactant dioctadecyl dimethyl ammonium chloride (DODMAC), it demonstrated remarkable catalytic capability and recyclability for both model fuel and commercial diesel. Further, the AODS reaction mechanism, identified as a free radical oxidation–reduction process, was verified by way of radical quenching experiments, EPR and XPS analysis. This approach offers a feasible route for the synthesis of new Dawson-type POMs@MOFs of heterogeneous catalysts for highly active AODS of fuel.
期刊介绍:
Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.