生物质炭对聚丙烯热解挥发分的催化重整分析
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摘要
应用生物质衍生焦炭对聚丙烯挥发分进行催化重整,分别将Na_2CO_3、CaO和Fe_2O_3负载在炭中以实现催化效果的强化。通过对比液相产率、产气率可以看出:生物质炭对聚丙烯挥发分有显著的催化重整效果,温度为750℃时液相产率为11.80%,较无催化时下降了13.60%。Na_2CO_3作用下随着温度的升高,750℃时液相产率为8.66%,较聚丙烯单独热解时下降了16.74%,产气率最高可达50.86%。负载Fe基的生物质衍生焦炭,在高温阶段对聚丙烯热解挥发分的降解效果不明显,液相产率750℃时为11.64%,产气率为47.91%。添加CaO,随着热解温度的提升液相产率最低可至9.36%,较单独热解时下降了16.04%,产气率最高可达50.18%。在本实验条件下,生物质炭中负载Na基对聚丙烯挥发分催化重整效果最为明显。
Biomass-derived coke was used to catalyze and crack polypropylene volatile matter. Na_2CO_3, CaO and Fe_2O_3 were respectively loaded in carbon to enhance the catalytic effect. By comparing the liquid phase yield and gas production rate, it can be seen that the biomass charcoal has a significant catalytic reforming effect on polypropylene volatile. The liquid phase yield is 11.80% at 750 ℃, which is 13.60% lower than that without catalysis. With the increase of temperature under the action of Na_2CO_3, the liquid phase yield at 750 ℃ was 8.66%, 16.74% lower than that of polypropylene pyrolysis alone, and the highest gas production rate was 50.86%. The degradation effect of Fe-based biomass-derived coke on polypropylene pyrolysis volatile is not obvious at high temperature. The liquid phase yield is 11.64% at 750 ℃ and the gas production rate is 47.91%. When CaO is added, the liquid phase yield can reach 9.36% with the increase of pyrolysis temperature, which is 16.04% lower than that of pyrolysis alone, and the highest gas production rate can reach 50.18%. Under the experimental conditions, the effect of Na-based additives loaded in biomass char on catalytic reforming of polypropylene volatile matter is the most obvious.
Biomass-derived coke was used to catalyze and crack polypropylene volatile matter. Na_2CO_3, CaO and Fe_2O_3 were respectively loaded in carbon to enhance the catalytic effect. By comparing the liquid phase yield and gas production rate, it can be seen that the biomass charcoal has a significant catalytic reforming effect on polypropylene volatile. The liquid phase yield is 11.80% at 750 ℃, which is 13.60% lower than that without catalysis. With the increase of temperature under the action of Na_2CO_3, the liquid phase yield at 750 ℃ was 8.66%, 16.74% lower than that of polypropylene pyrolysis alone, and the highest gas production rate was 50.86%. The degradation effect of Fe-based biomass-derived coke on polypropylene pyrolysis volatile is not obvious at high temperature. The liquid phase yield is 11.64% at 750 ℃ and the gas production rate is 47.91%. When CaO is added, the liquid phase yield can reach 9.36% with the increase of pyrolysis temperature, which is 16.04% lower than that of pyrolysis alone, and the highest gas production rate can reach 50.18%. Under the experimental conditions, the effect of Na-based additives loaded in biomass char on catalytic reforming of polypropylene volatile matter is the most obvious.
引文
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[22] 梁皓,宋喜军,尹泽群,等.化学链制氢中Fe2O3/LaFeO3载氧体的性能研究[J].燃料化学学报,2013,41(12):1512-1519.
[2] KYONGHWAN L,NAMSUN R,DAEHYUN S.New technology development for production of alternative fuel oil from thermal degradation of plastic waste[J].Journal of the Korean Institute of Resources Recycling,2006,15(1):37-45.
[3] 吴自强,唐四丁,胡海.废旧聚丙烯回收利用技术的现状及发展趋势[J].再生资源与循环经济,2002(1):25-27.
[4] 熊汉国,曾庆想.国内降解塑料的生产现状及发展中应注意的问题[J].化工环保,2000,20(3):15-18.
[5] 邓代举.聚丙烯催化热解及与几种典型生物质共热解研究[D].成都:四川大学,2006.
[6] WILLIAMS P T,SLANEY E.Analysis of products from the pyrolysis and liquefaction of single plastics and waste plastic mixtures[J].Resources Conservation & Recycling,2007,51(4):754-769.
[7] NAKAMURA I,FUJIM OTO K.Development of new disposable catalyst for waste plastics treatment for high quality transportation fuel[J].Journal of the Japan Petroleum Institute,1996,39(6):443.
[8] SAKATA Y,UDDIN A,MUTO A,et al.Thermal and catalytic degradation of municipal waste plastics into fuel oil[J].Polymer Recycling,1996,2(4):309-315.
[9] 尤占平,由世俊,李宪莉,等.生物质炭催化裂解焦油的实验研究[J].太阳能学报,2011,32(5):718-723.
[10] LIANG B,LEHMANN J,SOLOMON D,et al.Black carbon increases cation exchange capacity in soils[J].Soil Science Society of America Journal,2006,70(5):1719- 1730.
[11] 陈文义,蔡雨辰,孙姣,等.酸性糠醛残渣热解实验及热解炭性能研究[J].化学工程,2017,45(1):5-10.
[12] 郭平,王观竹,许梦,等.不同热解温度下生物质废弃物制备的生物质炭组成及结构特征[J].吉林大学学报:理学版,2014(4):855-860.
[13] 唐兰,黄海涛,吴创之.聚丙烯等离子体热解与管式炉热解对比研究[J].化学工程,2005,33(4):44-47.
[14] 程水源,NG F.废塑料裂解生产原料油的研究[J].环境工程学报,2002,3(2):37-40.
[15] FAN L,RAMKUMAR S.Utilization of chemical looping strategy in coal gasification processes [J].Particuology,2008,6(3):131-142.
[16] SATO S,LIN S Y,SUZUKI Y,et al.Hydrogen production from heavy oil in the presence of calcium hydroxide [J].Fuel,2003,82(5):561-567.
[17] 潘春鹏,陈翀,黄群星,等.添加CaO对生物质热解焦油生成的影响研究[J].热力发电.2012,41(8):24-29.
[18] TRAN D Q,RAI C.A kinetic model for pyrolysis of Douglas fir bark[J].Fuel,1978,57(5):293-298.
[19] DEMIRBAS A.Gaseous products from biomass by pyrolysis and gasification:effects of catalyst on hydrogen yield[J].Energy Conversion & Management,2002,43(7):897-909.
[20] RUSTAMOV V R,ABDULLAYEV K M,SAMEDOV E A.Bio-mass conversion to liquid fuel by two-stage thermochemical cycle[J].Energy Conversion & anagement,1998,39(9):869-875.
[21] 闫国荀,景晓东,温浩,等.聚烯烃与其裂解产物返回共裂解的研究[J].化学工程,2015,43(1):55-60.
[22] 梁皓,宋喜军,尹泽群,等.化学链制氢中Fe2O3/LaFeO3载氧体的性能研究[J].燃料化学学报,2013,41(12):1512-1519.