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ankang276金虫 (正式写手)
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Metal catalysts dispersed on acidic supports are preferred for selective ring-opening and a number of Group VIII metals have been reported to have good activity and selectivity for RO, including Rh, Ru, Ir, Pt, Pd/Pt and Pt/Ir . However, these metals are costly and have relatively low resistance to sulphur poisoning. In previous work, molybdenum carbide supported on zeolites of medium acidity were identified as potential alternatives to conventional supported Group VIII metal catalysts for RO . Subsequent studies showed that increased Mo2C loading decreased the catalyst acidity, as measured by temperature- programmed desorption of n-propylamine, and increased the Mo2C dispersion, as measured by XRD and XPS . |
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sltmac
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2楼2011-08-06 21:35:08
liubencai
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爱与雨下(金币+1): 欢迎常来~！ 2011-08-07 06:26:12
ankang276(金币+20, 翻译EPI+1): 2011-08-07 09:28:49
爱与雨下(金币+1): 欢迎常来~！ 2011-08-07 06:26:12
ankang276(金币+20, 翻译EPI+1): 2011-08-07 09:28:49
| 据报道，负载于酸性载体上的金属催化剂对开环反应有优先选择性，并且一些第八族的金属对氧化还原过程有很好的活性和选择性，包括Rh, Ru, Ir, Pt, Pd/Pt和Pt/Ir。但是，这些金属成本高以及对硫中毒的抵抗能力比较差。在先前的工作中，负载于中等酸性分子筛上的碳化钼被认为是有潜力的催化剂，它会替代氧化还原过程中负载的第八族金属的传统催化剂。后来的研究表明，在程序控温脱附n-丙胺测定中，发现增加Mo2C的负载量会降低催化剂的酸性；通过XRD和XPS测量发现，会提高碳化钼的分散性。 |
3楼2011-08-06 22:54:12
