钨酸锆催化剂的成型以及黏结剂在异构化中的作用

The present work reports the new results of pseudo-boehmite addition as binder in the synthesis of the shaped Pt/WO3-ZrO2-Al2O3 (denoted as PtWZA) catalysts. The results showed that the shaping with binder can noticeably influence the structure, acidity of catalyst and then improved the catalytic performance in n-heptane isomerization, except for providing the mechanical strength of the catalyst. The suitable binder content could improve the isomerization activity and/or selectivity by changing the acidity of PtWZA. The influence of binder content depended on WO3 content in the catalyst. The PtWZA catalysts containing 5-15wt% binder (dry basis content of binder) possessed favorable isomerization performance, depending on the contents of WO3. The suitable catalyst contained Pt20WZ5A and Pt30WZ15A, which could give approximately 80-90% conversion and 90% selectivity. These new findings enriched the knowledge of the binder in the catalyst shaping process that will be useful in the production of industrial catalysts.

New insight into the catalyst shaping of Pt/WO3-ZrO2 using pseudo-boehmite as binder and its roles in the n-heptane isomerization

The present paper reports new results regarding the addition of pseudo-boehmite as a binder during the synthesis of shaped Pt/WO3-ZrO2-Al2O3 (PtWZA) catalysts. Binder shaping can noticeably influence the structure and acidity of catalyst and improve its catalytic performance with regard to n-heptane isomerization, except for providing the mechanical strength of the catalyst. A suitable binder content can improve the isomerization activity or selectivity by changing the acidity of PtWZA. The influence of the binder content depends on the WO3 content of the catalyst. PtWZA catalysts that contain 5%–15% binder on a dry basis exhibit favorable isomerization performance that depends on WO3 content. Suitable catalysts include Pt20WZ5A and Pt30WZ15A, which provide conversions of approximately 80%–90% and a selectivity of 90%. These new findings enrich researcher knowledge of the effect of the binder on the catalyst shaping process and are useful in the production of industrial catalysts.