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yexuqing木蟲之王 (文學(xué)泰斗)
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用乙烯和賤金屬非均相催化劑將廢舊聚烯烴轉(zhuǎn)化為輕烯烴
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Polyolefin waste to light olefins with ethylene and base-metal heterogeneous catalysts 用乙烯和賤金屬非均相催化劑將廢舊聚烯烴轉(zhuǎn)化為輕烯烴 ▲ 作者:RICHARD J. CONK, JULES F. STAHLER, JAKE X. SHI, JI YANG, NATALIE G. LEFTON, JOHN N. BRUNN, ALEXIS T. BELL, AND JOHN F. HARTWIG ▲鏈接: https://www.science.org/doi/10.1126/science.adq7316 ▲摘要: 原則上,將塑料分解成其原始構(gòu)件是一種理想的回收策略。但在實踐中,這種方法不可能用于目前使用的兩種最常見的塑料——聚乙烯和聚丙烯。因為相關(guān)反應(yīng)在能耗上不占優(yōu)勢。最近,幾組研究人員表明,用合適的催化劑引入新鮮的乙烯可以將聚烯烴轉(zhuǎn)化為丙烯,但用于催化的貴金屬價格過高。 現(xiàn)在Conk等人發(fā)現(xiàn),可以在這個過程中使用地球上更豐富的氧化鎢和鈉的組合。研究表明,氧化鎢在二氧化硅上和鈉在γ-氧化鋁上的簡單組合將聚乙烯和聚丙烯或兩者的混合物轉(zhuǎn)化為丙烯或丙烯和異丁烯的混合物,在320°C下產(chǎn)量大于90%,而不需要對起始聚烯烴進(jìn)行脫氫。 ▲ Abstract: Breaking down plastic into its original building blocks is an ideal recycling strategy in principle. Unfortunately, in practice, this approach isn’t possible for the two most common plastics currently in use, polyethylene and polypropylene, because the reaction is too energetically unfavorable. Very recently, several groups of researchers showed that introducing fresh ethylene with the right catalyst can transform polyolefins into propylene, but the precious metals used for the catalysis are prohibitively expensive. Conk et al. now report that the process works using a more Earth-abundant combination of tungsten oxide and sodium. The research shows that the simple combination of tungsten oxide on silica and sodium on gamma-alumina transforms PE, PP, or a mixture of the two, including postconsumer forms of these materials, to propylene or a mixture of propylene and isobutylene in greater than 90% yield at 320°C without the need for dehydrogenation of the starting polyolefins. |

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