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| Catalytic pyrolysis of scrap tire to produce valuable liquid products using purified attapulgite |
| DING Kuan, ZHONG Zhao-ping, ZHANG Bo, LIU Zhi-chao |
| School of Energy and Environment, Southeast University, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Nanjing 210096, China |
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Abstract To investigate the influence of attapulgite on pyrolysis of scrap tire, NaOH, HY-51, attapulgite (OA) and purified attapulgite (PA) were chosen for catalytic pyrolysis. The mechanism of catalysts on composition of pyrolysis oil was investigated through principal component analysis (PCA). The results show that the highest oil yield of non-catalytic pyrolysis reaches 42.4% at 550℃. All the catalysts increase the oil yield. The content of aliphatic hydrocarbons reduces when temperature rises, while aromatic hydrocarbons become major components. NaOH and HY-51 improvethe content of aliphatic hydrocarbons, while the latter shows greater impact on aromatic hydrocarbons. The production of cycloolefins, as well as the conversion of aromatic hydrocarbons from monocyclic (MAH) to polycyclic (PAH), are promoted by OA. PA is
beneficial for the conversion of aliphatic hydrocarbons to MAH. Consequently, PA has a good prospect in the catalytic pyrolysis of scrap tire to produce valuable liquid products.Keywords: scrap tire; catalysis; pyrolysis; attapulgite; principal component analysis.
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Published: 01 November 2014
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纯化凹凸棒土催化废轮胎热解制取高值液态产物
为研究纯化凹凸棒土对废轮胎热解的影响,选取NaOH、HY-51、凹凸棒土（凹土,OA）和纯化凹土（PA）4种催化剂进行催化热解试验,利用主成分分析法分析催化剂对热解油组分变化的影响.结果表明：废轮胎非催化热解在550 ℃时产油率达到最高42.4%,4种催化剂均能提高产油率；热解油中脂肪烃含量随着温度升高而降低,而芳香烃逐渐成为主要组分；NaOH和HY-51可提高脂肪烃的含量,后者对芳香烃的影响更大；OA则能促进环烯烃的生成并催化单环芳烃转化为多环芳烃；PA能够有效地催化脂肪烃向单环芳烃转化.分析结果表明,PA在催化废轮胎热解制取高价值液态产物方面具有很好的应用前景.
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