Evaluation of Pd-based catalysts and the influence of operating conditions for autothermal reforming of dimethyl ether
Evaluation of Pd-based catalysts and the influence of operating conditions for autothermal reforming of dimethyl ether
复制标题
DOI：
10.1016/j.apcatb.2007.05.011
复制
发表时间：
2007-10
影响因子：
22.1
通讯作者：
M. Nilsson;P. Jozsa;L. Pettersson
中科院分区：
文献类型：
--
作者：
M. Nilsson;P. Jozsa;L. Pettersson
在二甲醚（DME）自热重整筛选研究中合成并测试了一系列不同的负载在陶瓷整体上的钯基催化剂。研究表明，在 350 至 400°C 的温度下，氧化铝负载的 Pd 对于该反应非常活跃。在Pd/γ-Al2O3中添加Zn可降低分解反应的活性，从而提高重整活性，并导致对二氧化碳的高选择性。在改变氧气与 DME 比率、蒸汽与 DME 比率和温度的参数研究中进一步评估了 Pd-Zn/γ-Al2O3。讨论了改变操作条件对重整器性能的影响。 Pd-Zn/γ-Al2O3催化剂产生的一氧化碳浓度低于5%，氢气浓度接近50%。通过氢气预处理，催化剂性能得到显着改善。第一轮催化剂表征研究的结果表明，还原后在氧化铝载体上形成了 Pd-Zn 物质。
A series of different Pd-based catalysts supported on ceramic monoliths were synthesized and tested in a screening study for autothermal reforming of dimethyl ether (DME). Alumina-supported Pd was shown to be very active for this reaction at temperatures between 350 and 400°C. Adding Zn to Pd/γ-Al2O3decreased the activity of decomposition reactions leading to better reforming activity, and resulting in high selectivity to carbon dioxide. Pd-Zn/γ-Al2O3was further evaluated in a parameter study varying oxygen-to-DME ratio, steam-to-DME ratio and temperature. The effect on the reformer performance of changing the operating conditions is discussed. The Pd-Zn/γ-Al2O3catalyst generated carbon monoxide concentrations below 5%, and hydrogen concentrations close to 50%. The catalyst performance was significantly improved by preconditioning in hydrogen. Results from a first round of catalyst characterization studies suggest that Pd–Zn species are formed on the alumina support following reduction.