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首页> 外文期刊>Russian Chemical Bulletin >n-Alkane isomerization on heteropolyacids 1.The influence of acid-base properties of alumina systems on the state of supported 12-tungstophosphoric heterop
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n-Alkane isomerization on heteropolyacids 1.The influence of acid-base properties of alumina systems on the state of supported 12-tungstophosphoric heterop

机译:杂多酸的正构烷烃异构化1.氧化铝体系的酸碱性质对负载的12-钨磷杂化物状态的影响

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摘要

Acid-base properties of bulk 12-bungstophosphoric heteropolyacid (HPWA) and HPWA supported on alumina and fluorinated alumina were studied by DRIFT spectroscopy using adsorption of probe molecules.Catalytic properties of Pt-containing catalysts carried by these supports were studied in n-pentane isomerization.It was shown that the Pt/HPWA/Al_2O_3 system is almost inactive in isomerization as a result of the interaction of HPWA with basic sites of the alumina support.On the contrary,the presence of acidic sites in fluorinated alumina prevents HPWA destruction and favors the uniform distribution of HPWA on the support surface.As a result,enhancenment of the activity and selectivity of the Pt/HPWA/Al_2O_3-F catalyst in n-pentane isomerization is observed.
机译:利用探针分子的吸附,通过DRIFT光谱研究了负载在氧化铝和氟化氧化铝上的12-笨重磷杂多酸(HPWA)和HPWA的酸碱性质;研究了这些载体负载的含Pt催化剂在正戊烷异构化中的催化性能。结果表明,由于HPWA与氧化铝载体碱性位点的相互作用,Pt / HPWA / Al_2O_3体系几乎没有活性。相反,氟化氧化铝中酸性位点的存在阻止了HPWA的破坏并有利于结果,观察到正戊烷异构化过程中Pt / HPWA / Al_2O_3-F催化剂活性和选择性的提高。

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