Abstract

A platinum-substituted alumina-promoted sulfated zirconia (PtAu/SZA) was prepared and used for the conversion of isobutane to n-butane, aiming to optimize the ethylene feedstock in the steam thermal cracking process and increase the ethylene yield. PtAu bimetallic catalysts showed higher catalytic activity than Pt-alone catalyst, and the enhancement is attributed to PtAu alloying. By diluting and separating Pt with PtAu alloy agglomerates, continuous Pt agglomerates disappear and hydrogen dissociation on Pt is enhanced. In addition, the reduction temperature of Pt is decreased with the increase in Au content, while the reduction temperature of sulfate was increased which will delay the loss of sulfate according to the results of H₂-TPR and NH₃-TPD. However, the acidity of the catalyst decreases with the increase in Au, which is due to that PtAu alloy covers the acid sites on the surface. Overall, we found that the Pt_0.5Au_0.3/SZA showed the highest yield to n-butane (34.69%).

Graphic abstract

中文翻译：

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双功能PtAu-固体超强酸催化剂将异丁烷转化为正丁烷

摘要

制备了铂取代的氧化铝促进的硫酸化氧化锆（PtAu / SZA），并将其用于异丁烷向正丁烷的转化，目的是在蒸汽热裂化工艺中优化乙烯原料并提高乙烯收率。PtAu双金属催化剂显示出比单独的Pt催化剂更高的催化活性，这种增强归因于PtAu合金化。通过用PtAu合金团块稀释和分离Pt，连续的Pt团块消失并且Pt上的氢离解得到增强。另外，Pt的还原温度随着Au含量的增加而降低，而硫酸盐的还原温度升高，这将根据H ₂ -TPR和NH ₃的结果延迟硫酸盐的损失。-TPD。然而，催化剂的酸度随着Au的增加而降低，这是由于PtAu合金覆盖了表面上的酸位。总体而言，我们发现Pt _0.5 Au _0.3 / SZA对正丁烷的收率最高（34.69％）。

图形摘要