Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5
Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5
复制标题
PbO 改性 HZSM-5 催化 CH3Br 转化为芳烃
DOI：
10.1016/j.apcata.2009.07.039
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发表时间：
2009-10
影响因子：
5.5
通讯作者：
Tao, Ling
中科院分区：
文献类型：
--
作者：
Ren, Yan-Qun;Zhou, Xiao-Ping;Chen, Lang;Li, Wen-Sheng;Au, Chak-Tong;Yin, Shuang-Feng;Luo, Sheng-Lian;Tao, Ling
研究了PbO改性HZSM-5分子筛催化剂上溴甲烷转化为芳烃的反应。考察了PbO负载量、HZSM-5的SiO2/Al 2 O3摩尔比、催化剂焙烧条件对催化剂性能的影响。结果表明，PbO的最佳负载量为5wt%，SiO2/Al 2 O3为70时，催化剂的性能最佳。在450°C下焙烧8h，PbO含量为5wt%的HZSM-5催化剂性能最好。PbO对HZSM-5的改性效果上级，HZSM-5的改性效果优于SiO_2、Al_2O_3和ZrO_2。表征结果表明：PbO高度分散在HZSM-5载体上，PbO的作用是促进烃类芳构化，HZSM-5的酸性中心是CH 3Br转化为芳烃所必需的。我们发现催化剂的失活是由于碳质沉积物堵塞孔隙造成的。结果表明，该方法可以有效地将甲烷转化为芳烃。
The catalytic conversion of CH3Br to aromatics was investigated over PbO-modified HZSM-5. The effects of PbO loading, SiO2/Al2O3molar ratio of HZSM-5, and calcination conditions of catalyst on catalytic performance were studied. It was found that the most suitable PbO loading and SiO2/Al2O3ratio are 5wt% and 70, respectively. The 5wt% PbO/HZSM-5 calcined at 450°C for 8h performs the best. Also, PbO is superior to the other metal oxides selected to modify HZSM-5, and HZSM-5 is better than SiO2, Al2O3or ZrO2as support. The characterization results indicate that (i) the PbO species is highly dispersed on the HZSM-5 support, (ii) the role of PbO is to promote hydrocarbon aromatization, and (iii) the acid sites of HZSM-5 are indispensable for CH3Br conversion into aromatics. We found that the deactivation of catalyst is due to pore blocking by carbonaceous deposits. The overall results demonstrate that the method is efficient for the conversion of CH4to aromatics.
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影响因子：
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影响因子：
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