Catalytic upgrading of pyrolytic vapors from the vacuum pyrolysis of rape straw over nanocrystalline HZSM-5 zeolite in a two-stage fixed-bed reactor
Catalytic upgrading of pyrolytic vapors from the vacuum pyrolysis of rape straw over nanocrystalline HZSM-5 zeolite in a two-stage fixed-bed reactor
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两级固定床反应器中纳米晶 HZSM-5 沸石对油菜秸秆真空热解热解蒸气的催化升级
DOI：
10.1016/j.jaap.2014.05.001
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发表时间：
2014-07
影响因子：
6
通讯作者：
Haiyun Yin
中科院分区：
文献类型：
--
作者：
Yixi Cai;Xiaohua Li;Ning Yu;Haiyun Yin
本研究涉及生物质（油菜秸秆）的真空热解和热解蒸汽在反应器第二段的在线催化升级。在前人对生物质真空热解研究的基础上，利用纳米晶HZSM-5分子筛，研究了催化温度、生物质与催化剂质量比、催化剂硅铝比等操作因素对产物收率和质量的影响。采用响应面法（RSM）进一步优化了油相收率。统计分析表明，操作因素对产品收率有显著影响。在催化温度为491.2℃、生物质与HZSM-5质量比为0.302、催化剂Si/Al比为53.3的条件下，获得了最大油相产率的最佳条件。确认运行的油相产率分别为9.82%和9.80%，而预测值为9.90%。在最佳条件下，油相的H/C、O/C摩尔比（干基）、密度、pH值、动态粘度和高热值分别为1.518、0.195、0.96 g/ cm3、5.15、5.12 mm2 /s和33.80 MJ/kg。采用气相色谱/质谱（GC/MS）检测液体产品成分。油相中含有大量的芳烃和轻酚类物质，其多分散性较低，为1.35 （M¯n= 218.14 g/mol, M¯w= 293.73 g/mol）。水相中还含有大量的轻芳烃。纳米晶HZSM-5的使用使芳香烃、轻酚类和醇类等理想化合物显著增加，酸类、醛类和酮类等不稳定和腐蚀性化合物显著减少。此外，在空气气氛中对油相进行了热重分析。结果表明，该油相具有较高的收率和质量，可作为发动机燃料使用。
This investigation involved the vacuum pyrolysis of biomass (rape straw) and the online catalytic upgrading of pyrolytic vapors in the second stage of the reactor. Based on the previous study on vacuum pyrolysis of biomass, effects of the operating factors including catalyzing temperature, biomass to catalyst mass ratio and catalyst Si/Al ratio on product yields and qualities have been studied using nanocrystalline HZSM-5 zeolite. Optimization of the oil phase yield was further conducted by employing response surface methodology (RSM). The statistical analysis showed that the operating factors significantly affected the product yields. The optimal conditions for the maximum oil phase yield were obtained at catalyzing temperature of 491.2° C, biomass to HZSM-5 mass ratio of 0.302 and catalyst Si/Al ratio of 53.3. Confirmation runs gave 9.82% and 9.80% of the oil phase yield compared to 9.90% of predicated value. The H/C, O/C molar ratios (dry basis), density, pH value, dynamic viscosity and high heat value of the oil phase obtained at optimal conditions were 1.518, 0.195, 0.96 g/cm 3, 5.15, 5.12 mm 2/s and 33.80 MJ/kg, respectively. Liquid product compositions were examined using gas chromatography/mass spectrometry (GC/MS). A large amount of aromatic hydrocarbons and light phenols were detected in the oil phase which contributed to a relatively low polydispersity of 1.35 (M¯ n= 218.14 g/mol and M¯ w= 293.73 g/mol). The aqueous phase also contained a large number of light aromatics. The use of nanocrystalline HZSM-5 caused a remarkable increase of the desirable compounds including aromatic hydrocarbons, light phenols and alcohols, and a significant decrease of the unstable and corrosive compounds (eg, acids, aldehydes and ketones). Besides, thermo-gravimetric analysis of the oil phase was conducted within air atmosphere. It was indicated that the oil phase had higher yield and qualities which might be used as an engine fuel.
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影响因子：
--
作者：
Jin-jiang Wang;Jie Chang;Juan Fan
通讯作者：
Jin-jiang Wang;Jie Chang;Juan Fan
影响因子：
6
作者：
Ying Xu;Tiejun Wang;Longlong Ma;Qi Zhang;Lu Wang
通讯作者：
Ying Xu;Tiejun Wang;Longlong Ma;Qi Zhang;Lu Wang
影响因子：
2.1
作者：
P. Lan;Qingli Xu;Ming-Chai Zhou;L. Lan;Suping Zhang;Yong-jie Yan
通讯作者：
P. Lan;Qingli Xu;Ming-Chai Zhou;L. Lan;Suping Zhang;Yong-jie Yan
DOI：
10.4028/www.scientific.net/amm.174-177.1429
发表时间：
2012-05
期刊：
Applied Mechanics and Materials
影响因子：
--
作者：
Jiang Yi;Ji Zong Zhang;S. Yao;Jian-min Chang;Ben Li
通讯作者：
Jiang Yi;Ji Zong Zhang;S. Yao;Jian-min Chang;Ben Li
影响因子：
11.4
作者：
Huiyan Zhang;R. Xiao;He Huang;Gang Xiao
通讯作者：
Huiyan Zhang;R. Xiao;He Huang;Gang Xiao