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fine support
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  fine support
However, a very large number of particles and a fine support grid are required to conserve mass in particle tracking approaches.
      


The catalytic performance for methane aromatization in the absence of oxygen over various supported zeolite catalysts was studied on a continuous flow fixed bed reactor. It is found that H form silica alumina zeolites with two dimensional space structure, such as ZSM 5, ZSM 8 and ZSM 11 whose pore size is very near to the dynamic diameter of benzene (0 6 nm), are fine supports for methane aromatization, among which 3%MoO 3/HZSM 11 possesed the highest activity and stability, the maximum conversion...

The catalytic performance for methane aromatization in the absence of oxygen over various supported zeolite catalysts was studied on a continuous flow fixed bed reactor. It is found that H form silica alumina zeolites with two dimensional space structure, such as ZSM 5, ZSM 8 and ZSM 11 whose pore size is very near to the dynamic diameter of benzene (0 6 nm), are fine supports for methane aromatization, among which 3%MoO 3/HZSM 11 possesed the highest activity and stability, the maximum conversion of methane and selectivity to benzene are 8 0% and 90 9% respectively. The catalytic performance of MoO 3/HZSM 8 and 3%MoO 3/H β are relatively lower than that of 3%MoO 3/ HZSM 5. The catalysts supported on HMCM 41 and HSAPO 34 have a very low activity for the reaction and over the catalysts of MoO 3/HMOR, HX and HY only a small amount of ethylene is produced, while hydrocarbons have not been detected over the catalysts of MoO 3/HSAPO 5 and MoO 3/HSAPO 11.

考察了担载MoO3的沸石催化剂上甲烷的无氧芳构化性能,并与沸石结构相关联.结果表明,孔径与苯分子动态直径相当的ZSM-5、ZSM-8、ZSM-11和β沸石等是甲烷无氧芳构化催化剂的良好载体,其中3%MoO3/HZSM-11具有最高的甲烷芳构化活性和稳定性,973K下的转化率和苯选择性分别为8.0%和90.9%;6%MoO3/HZSM-8与7%MoO3/H-β芳构化性能相当.以HMCM-41和HSAPO-34为载体时芳构化活性很低,以HMOR、HX和HY为载体时仅有少量乙烯生成,而以HSAPO-5和HSAPO-11为载体时未检测到烃类生成.

The region_scaled soil loss study is an important issue of the subject of soil and water conservation. Its aim is to disclose the regional soil loss regulation which may be different from that of slope and catchment studies, plot and forecast the regional soil erosion, and then make a fine support to decision_making for regional soil and water control. Such studies can be reached by upscaling, where the slope or small watershed studies are its foundation and GIS, GPS and remote sensing technologies are...

The region_scaled soil loss study is an important issue of the subject of soil and water conservation. Its aim is to disclose the regional soil loss regulation which may be different from that of slope and catchment studies, plot and forecast the regional soil erosion, and then make a fine support to decision_making for regional soil and water control. Such studies can be reached by upscaling, where the slope or small watershed studies are its foundation and GIS, GPS and remote sensing technologies are strong support. On the other hand, regional study can also be got by macro_synthesis. But, because of different reasons, such study is still immature. In this paper, taking this issue as a topic, its current situation is discussed; the main problems are described; and the coming studies are previewed here. Finally, such ideas are kept: factors affecting regional soil loss are different from that of slope and catchment studies, and the law of each factor should be studied respectively; the models system of regional soil loss should be constructed; and some key technologies about regional soil loss study, such as the integration between "3S" and erosion model, upscaling method and so on should be focused to get a fine answer.

以区域水土流失为主题 ,分析并阐述了该领域的研究现状 ,指出了当前存在的主要问题 ,并对研究的今后发展方向进行了展望。

The catalytic behavior of Mo based zeolite catalysts with different pore structure and size, particularly with 8 membered ring (MR), 10 MR, coexisted 10 and 12 MR, and 12 MR, was studied in methane aromatization under the conditions of SV= 1?500 ml/(g·h), p =0 1 MPa and T =973 K. It was found that the catalytic performance is correlated with the pore structure of the zeolite supports. The zeolites that possess 10 MR or 10 and 12 MR pore structure with a pore diameter equal to or slightly larger...

The catalytic behavior of Mo based zeolite catalysts with different pore structure and size, particularly with 8 membered ring (MR), 10 MR, coexisted 10 and 12 MR, and 12 MR, was studied in methane aromatization under the conditions of SV= 1?500 ml/(g·h), p =0 1 MPa and T =973 K. It was found that the catalytic performance is correlated with the pore structure of the zeolite supports. The zeolites that possess 10 MR or 10 and 12 MR pore structure with a pore diameter equal to or slightly larger than the dynamic diameter of benzene molecule, such as ZSM 5, ZSM 11, ZRP 1 and MCM 22, are fine supports. Among the tested zeolite supports, MCM 22 exhibits the highest activity and selectivity for benzene. A methane conversion of 10 5% with benzene selectivity of 80% was achieved over Mo/MCM 22 catalyst. The Mo/ERS 7 catalyst with 8 MR (0 45 nm) does not show any activity in methane dehydro aromatization, while Mo/JQX 1 and Mo/SBA 15 catalysts with 12 MR pore exhibit little activity in the reaction. It can be concluded that the zeolites with 10 MR pore or coexisted 10 and 12 MR, having pore size equal to or slightly larger than the dynamic diameter of benzene molecule, are fine supports for methane activation and aromatization.

钼基分子筛催化剂 ,由于不同分子筛的孔道大小及孔道形状不同 ,对甲烷芳构化反应表现出不同的催化性能 .具有 8元环孔道结构的小孔ERS 7分子筛没有催化活性 ,说明甲烷的芳构化反应离不开分子筛孔道的择形作用 ,较小的孔道中不能生成苯等芳烃 .具有 10元环孔道结构的ZSM 5 ,ZSM 11和ZRP 1三种分子筛具有较好的催化性能 ,但由于其孔道大小及孔道形状的差别在催化行为上表现出一定的差异 .具有 10元环和 12元环孔道结构的MCM 2 2分子筛 ,尤其对苯等轻芳烃而言 ,催化性能最佳 .具有 12元环孔道结构的JQX 1以及中孔分子筛SBA 15 ,虽然具有一定的催化性能 ,但活性较低 .研究结果表明 ,孔道大小与苯分子动态直径相近或孔道稍大的分子筛是催化甲烷芳构化反应的良好载体 ,孔道过大或过小都不利于苯和萘等芳烃的生成

 
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