On the Influences of Carrier Gas Type and Flow Rate on CVD Synthesis of CNTs from Postconsumer Polyethylene,Industrial & Engineering Chemistry Research

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On the Influences of Carrier Gas Type and Flow Rate on CVD Synthesis of CNTs from Postconsumer Polyethylene
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-09 , DOI: 10.1021/acs.iecr.0c02000
Aidin Panahi ₁ , Xiao Sun ₁ , Guangchao Song ₁ , Yiannis A. Levendis ₁

Affiliation

Multiwall carbon nanotubes (MWCNTs) were generated from recycled low-density polyethylene (LDPE). The polymer was pyrolyzed at 800 °C in inert atmospheres, and the gaseous pyrolyzates—light hydrocarbons and hydrogen—served as carbon donors for the MWCNTs, which were catalytically grown by chemical vapor deposition (CVD) at 800 °C. This investigation examined the influences of carrier gas type and flow rate on the synthesis of MWCNTs on stainless steel wire cloth substrates. The influences of the carrier gases (nitrogen, helium, argon, or carbon dioxide gases) and their flow rates (0.1, 1, and 2 L/min) were both found to have significance on both the yields and the characteristics of the produced MWCNTs. The obtained yields were the highest and the tubes were the longest in nitrogen, due to an apparent, yet unexpected, rate-boosting effect of this nominally inert gas. The MWCNTs’ purity in the obtained yields appeared to be enhanced at the highest examined flow rate (2 L/min).

中文翻译：

载气类型和流速对消费后聚乙烯CVD合成CNTs的影响

多壁碳纳米管（MWCNT）由回收的低密度聚乙烯（LDPE）生成。聚合物在惰性气氛中于800°C进行热解，而气态热解产物（轻质烃和氢）充当MWCNT的碳供体，并通过化学气相沉积（CVD）在800°C催化生长。这项研究调查了载气类型和流速对在不锈钢丝网布基材上合成MWCNT的影响。发现载气（氮气，氦气，氩气或二氧化碳气体）及其流速（0.1、1和2 L / min）的影响均对所生产的MWCNT的产率和特性均具有重要意义。。由于表观的，但出乎意料的，所得到的产量最高，而试管中的氮气最长。这种名义上惰性气体的增速作用。在最高检测流速（2 L / min）下，所得碳纳米管的纯度有所提高。

更新日期：2020-08-05

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