Hydroisomerization of n-Heptane over Pt/USY Catalysts Promoted by Cr Additive
Hydroisomerization of n-Heptane over Pt/USY Catalysts Promoted by Cr Additive
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发表时间：
2007
影响因子：
0.7
通讯作者：
W. Rui
中科院分区：
文献类型：
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作者：
W. Rui
采用浸渍法制备了Cr、Al、Zn掺杂的Pt负载USY沸石催化剂，并通过XRD、低温氮气物理吸附、H2化学吸附和吡啶吸附红外光谱进行了表征。通过正庚烷在常压固定床反应器中的加氢异构化来评估催化活性。 Pt负载USY催化剂的Pt分散度和酸度受到助催化剂添加的影响。 Cr、Al或Zn促进的Pt负载催化剂，特别是Cr促进的催化剂，与不含掺杂剂的催化剂相比，催化稳定性更高，并且对正庚烷异构化表现出更高的催化活性和选择性。讨论了与催化剂的物理化学性质相关的转化率和选择性。
The Pt-supported USY zeolite catalysts doped with Cr, Al or Zn were prepared by impregnation, and characterized by XRD, low temperature nitrogen physisorption, H2-chemisorption and IR spectroscopy of the pyridine adsorption. Catalytic activities were evaluated via the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor. The Pt dispersion and acidity of the Pt-supported USY catalyst were influenced by the addition of the promoters. The Pt-supported catalysts promoted by Cr, Al or Zn, especially by Cr, were catalytically much more stable and exhibited much higher catalytic activity and selectivity for isomerization of n-heptane than the catalysts without the dopant. Both the conversion and selectivity are discussed in relation with the physicochemical properties of catalysts.