کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
39400 45822 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Directing two azo-bridged covalent metalloporphyrinic polymers as highly efficient catalysts for selective oxidation
ترجمه فارسی عنوان
هدایت دو پلیمرهای متالوپورفیرین کووالانزای آسو به عنوان کاتالیزورهای بسیار کارآمد برای اکسیداسیون انتخابی
کلمات کلیدی
پلیمر کووالان-آلی، کاتالیز زیست مولکولی، اکسیداسیون انتخابی، پورفیرین
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• Two covalent metalloporphyrinc polymers linked by azo (NN) bond were developed as novel materials.
• An excellent conversion with high selectivity was observed.
• The catalytic activity remained when the catalysts were recycled five times.
• A catalysis-promoted electronic environment around the Mn active sites was demonstrated.

Manganese meso-tetra (4-nitrophenyl)porphyrin (Mn-TNPP) with four nitro groups at periphery was employed as building moieties to condense with p-phenylenediamine and benzidine into extended π materials, respectively. Two covalent metalloporphyinic polymers (CMPs) linked by azo (NN) were denoted as azo-CMP-1 and azo-CMP-2. FT-IR, XRD, SEM, TG, contact angle (CA) and XPS were used to analyze and characterize the synthesized heterogeneous materials. The catalytic study has demonstrated that azo-CMP catalysts displayed an excellent performance for epoxidation of olefins, especially cyclohexene. When azo-CMP-1 was recycled five times, its catalytic activity remained with an inconspicuous decrease. Additionally, azo-CMP series exhibited a amphipathic property evidenced by CA test, facilitating the diffusion of reactant into channels of azo-CMPs. Furthermore, the peak value of Mn2p3/2 shifting to a higher value for azo-CMP-1 suggested that there was a catalysis-promoted electronic environment around the Mn(III) active sites, compared to either azo-CMP-2 or homogenous sites.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 489, January 2015, Pages 117–122
نویسندگان
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