Performance of Fe/SiC catalysts for cracking of toluene under microwave irradiation
Performance of Fe/SiC catalysts for cracking of toluene under microwave irradiation
复制标题
DOI：
10.1016/j.ijhydene.2018.02.158
复制
发表时间：
2018-04
影响因子：
7.2
通讯作者：
Yuchuan Zhang;Zhanlong Song;Ye Yan;Xiqiang Zhao;Jing Sun;Yanpeng Mao;Wenlong Wang
中科院分区：
文献类型：
--
作者：
Yuchuan Zhang;Zhanlong Song;Ye Yan;Xiqiang Zhao;Jing Sun;Yanpeng Mao;Wenlong Wang
本工作以甲苯作为生物质焦油的模型化合物，以廉价的碳化硅粉末负载铁为催化剂，考察了比微波功率、铁含量和空速对甲苯微波裂解的影响。结果表明，微波辅助甲苯裂解是有效的，裂解气的组成主要是氢气。在反应过程中，瞬时裂化效率和瞬时氢产率先增大后减小，在反应10~12min时达到最大值，分别为94.4%和89.8%。在最佳反应条件下，整个反应的总裂化效率和总氢产率分别达到最大值(86.3%和84.5%)。采用扫描电子显微镜-能谱仪(SEM-EDS)、热重分析(TG)、X-射线衍射仪(XRD)和程序升温氧化(TPO)对反应前后的催化剂进行了分析。结果表明，沉积的炭包括球状炭和丝状炭，积碳率可达2.3%，对甲苯的裂解有不利影响。
In this work, toluene as a model compound of biomass tar and inexpensive Fe supported on SiC powder as catalysts were used to investigate the influence of specific microwave power levels, Fe content, and space velocity on the microwave cracking of toluene. The results revealed that the microwave-aided cracking of toluene was efficient and that the composition of cracking gas was mainly H2. During the reaction, the instantaneous cracking efficiency and the instantaneous hydrogen yield increased initially and then decreased, with the highest values being recorded as 94.4% and 89.8% at 10–12 min of the reaction. For the whole reaction, the overall cracking efficiency and the overall hydrogen yield reached maximum (86.3% and 84.5%, respectively) when the tests were conducted under the optimum conditions. The catalysts before and after reaction were analyzed by scanning electron microscopy-energy dispersive spectrometer (SEM-EDS), thermogravimetry (TG), X-ray diffraction (XRD), and temperature programmed oxidation (TPO). The results confirmed that the deposited carbon included spherical and filamentous carbon and carbon deposition yield could reach 2.3%, which had a negative effect on the cracking of toluene.