Hydrogen production via partial oxidation and reforming of dimethyl ether
Hydrogen production via partial oxidation and reforming of dimethyl ether
复制标题
二甲醚部分氧化重整制氢
DOI：
10.1016/j.cattod.2009.01.026
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发表时间：
2009-08
期刊：
影响因子：
5.3
通讯作者：
Zhang, Qijian
中科院分区：
文献类型：
--
作者：
Zhou, Yingchun;He, Xinxin;Liu, Zhong-Wen;Du, Feng;Liu, Zhao-Tie;Zhang, Qijian
研究了6wt%Ni/Al_2O_3/Al_2O_3/Al_2O_3负载贵金属复合催化剂在常压下催化二甲醚部分氧化重整制氢的反应性能。结果表明，Rh/Al_2O_3具有比铂/Al_2O_3更好的催化性能。比较研究了不同碱金属硝酸盐LiNO3、NaNO3、KNO3对Rh/Al_2O_3的改性作用。氮气吸附/脱附结果表明，随着改性剂含量的增加，Rh/Al_2O_3的比表面积和孔容均明显减小。此外，LiNO_3的加入显著改变了Rh/Al_2O_3的孔径分布。在不考虑修饰剂的情况下，通过X射线衍射仪分析没有发现Rh的衍射峰。在Rh/Al_2O_3催化剂中加入小于5wt%的Na，可显著提高氢产率，同时二甲醚转化率始终保持在100%。当Rh/Al_2O_3中Li含量小于5wt%时，改性剂对二甲醚转化率和氢产率的影响不大。然而，当Rh/Al_2O_3中Na或Li的含量大于5wt%时，无论是二甲醚转化率还是氢产率，催化剂的稳定性都明显降低。在Rh/Al_2O_3催化剂中添加KNO_3对催化剂的初始氢产率和二甲醚转化率基本没有影响，但在2.5wt%的低质量分数下，KNO_3的加入使催化剂的稳定性变差。根据表征结果和可能的反应网络，这些实验现象初步解释为碱金属硝酸盐对Rh的电子促进作用和改性剂对催化剂孔性质的结构影响。
The catalytic partial oxidation and reforming of dimethyl ether (DME) over composite catalysts composed of 6wt%Ni/Al2O3and noble metal supported on Al2O3were investigated for the production of hydrogen under ambient pressure. Results indicate that Rh/Al2O3had better performance than Pt/Al2O3for the titled reaction. The modification of Rh/Al2O3with different contents of alkali metal nitrates, i.e., LiNO3, NaNO3, and KNO3, was comparatively studied. The N2adsorption/desorption results showed that both the surface area and pore volume of the Rh/Al2O3obviously decreased with the increase of the content of the modifiers. Moreover, the pore size distribution of Rh/Al2O3was significantly changed by the addition of LiNO3. Irrespective of the modifiers, there were no diffractions assigned to Rh by XRD analysis. By the addition of less than 5wt% Na into Rh/Al2O3, hydrogen yield was obviously increased while DME conversion was always 100%. When the content of Li in Rh/Al2O3was less than 5wt%, the effect of modifier on both DME conversion and hydrogen yield was negligible. However, the stability of the catalyst indicated either by DME conversion or by hydrogen yield was apparently decreased when the content of Na or Li in Rh/Al2O3was greater than 5wt%. Even at a lower content of 2.5wt%, the addition of KNO3into Rh/Al2O3deteriorated the stability of the catalyst although there was basically no effect on the initial hydrogen yield and DME conversion. Based on the characterization results and the possible reaction networks, these experimental phenomena were tentatively explained as the electronic promotional effect of alkali metal nitrates on Rh and the structural effects of the modifiers on the pore properties of the catalyst.
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影响因子：
5.5
作者：
V. Galvita;G. Semin;V. Belyaev;T. M. Yurieva;V. Sobyanin
通讯作者：
V. Galvita;G. Semin;V. Belyaev;T. M. Yurieva;V. Sobyanin
影响因子：
22.1
作者：
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通讯作者：
M. Nilsson;P. Jozsa;L. Pettersson
影响因子：
5.5
作者：
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通讯作者：
Eguchi, Koichi
影响因子：
5.5
作者：
Shizhong Wang;T. Ishihara;Y. Takita
通讯作者：
Shizhong Wang;T. Ishihara;Y. Takita
影响因子：
5.5
作者：
T. Mathew;Yusuke Yamada;A. Ueda;H. Shioyama;Tetsuhiko Kobayashi
通讯作者：
T. Mathew;Yusuke Yamada;A. Ueda;H. Shioyama;Tetsuhiko Kobayashi