 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 1 | 1/1 | 返回列表 |
| 查看: 762 | 回復(fù): 0 | |||
yexuqing木蟲之王 (文學(xué)泰斗)
太陽(yáng)系系主任
|
[交流]
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
|
|
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(shí)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?yàn)橄嚓P(guān)反應(yīng)在能耗上不占優(yōu)勢(shì)。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(jià)格過(guò)高。 現(xiàn)在Conk等人發(fā)現(xiàn)，可以在這個(gè)過(guò)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(jiǎn)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(duì)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. |
回復(fù)此樓» 猜你喜歡
304求調(diào)劑
已經(jīng)有3人回復(fù)
-
國(guó)家級(jí)人才課題組招收2026年入學(xué)博士
已經(jīng)有1人回復(fù)
-
專業(yè)論文潤(rùn)色/翻譯怎么收費(fèi)?
已經(jīng)有228人回復(fù)
-
304求調(diào)劑
已經(jīng)有4人回復(fù)
-
求調(diào)劑：報(bào)考中礦0817 總分299 有競(jìng)賽、科研經(jīng)歷
已經(jīng)有1人回復(fù)
-
0817一志愿蘇州大學(xué)280復(fù)試調(diào)劑
已經(jīng)有9人回復(fù)
-
0817找調(diào)劑
已經(jīng)有6人回復(fù)
-
PDF在線壓縮軟件
已經(jīng)有4人回復(fù)
-
材料/化學(xué)相關(guān)專業(yè)2026級(jí)學(xué)術(shù)/專業(yè)型碩士研究生
已經(jīng)有13人回復(fù)
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 yexuqing 的主題更新
| 1 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 315食品工程求調(diào)劑 +3 | Oreov0 2026-03-06 | 6/300 |
|
|---|---|---|---|---|
|
[考研] 085600材料與化工 326 求調(diào)劑 +4 | 熱愛生活ing 2026-03-09 | 4/200 |
|
|
|
[考研] 材料工程085601調(diào)劑求老師收留 +5 | 強(qiáng)木木木 2026-03-07 | 5/250 |
|
|
|
[考研] 一志愿山東大學(xué)，總分327，英語(yǔ)二79，有論文，有競(jìng)賽，已過(guò)四六級(jí) +3 | 木木目目1 2026-03-09 | 3/150 |
|
|
|
[考研] 348求調(diào)劑 +3 | wyx79618 2026-03-06 | 7/350 |
|
|
|
[考研] 307求調(diào)劑 +3 | 辛仁豆腐 2026-03-08 | 5/250 |
|
|
|
[考研] 308求調(diào)劑 +4 | 是Lupa啊 2026-03-08 | 6/300 |
|
|
|
[考研] 290 材料與化工求調(diào)劑 +7 | Nebulala 2026-03-08 | 7/350 |
|
|
|
[考研] 334求調(diào)劑 +8 | Trying] 2026-03-06 | 8/400 |
|
|
|
[考研] 085701環(huán)境工程317分求調(diào)劑 +9 | 6汆尼9 2026-03-07 | 9/450 |
|
|
|
[考研] 0307化學(xué)求調(diào)劑 +6 | 0ok0k 2026-03-07 | 6/300 |
|
|
|
[考研] 267化工調(diào)劑求助 +7 | 聰少OZ 2026-03-04 | 7/350 |
|
|
|
[考研] 求調(diào)劑 +4 | 呼呼？~+123456 2026-03-06 | 4/200 |
|
|
|
[考研] 一志愿211，0860總分286食品工程專業(yè)求調(diào)劑 +6 | 林林Winnie 2026-03-05 | 6/300 |
|
|
|
[考研] 0856材料與化工求調(diào)劑！ +5 | 化工考生111 2026-03-04 | 11/550 |
|
|
|
[考研] 304求調(diào)劑 +4 | 曼殊2266 2026-03-05 | 4/200 |
|
|
|
[考研] 347求調(diào)劑 +6 | 啊歐歐歐 2026-03-03 | 8/400 |
|
|
|
[考研] 304求調(diào)劑 +3 | 曼殊2266 2026-03-04 | 3/150 |
|
|
|
[考研] 307求調(diào)劑 +4 | xuyuan111 2026-03-04 | 5/250 |
|
|
|
[考研] 312求調(diào)劑 +8 | 醋精華了一下發(fā)?/a> 2026-03-03 | 10/500 |
|