2019年2月28日 · Silica-alumina hydrates (SIRAL) and the corresponding oxides (SIRALOX) exhibit characteristics which differ significantly from pure aluminas. One of the key properties of silica-aluminas is their comparatively high level of surface acidity, making them useful catalyst support materials, for example in the field of refinery catalyst or in diesel ...

* After activation at 550°C for 3 hours. Above Silica-Aluminas are also available as activated materials. Further specialty grades are available upon request.

We demonstrate here that Siralox 30 (total product selectivity = 66%, W / F = 12.5 g cat h mol −1) is an adequate and highly active catalyst for the continuous mesitylene synthesis with remarkable long-term operational stability (>50 hours-on-stream).

In general, the total acidity is governed by the Lewis-acidic sites. The highest concentration of Lewis-acidic sites is observed for SIRAL 5 while the highest amount of Brønsted-acidic sites is found in SIRAL 30 and SIRAL 40.

为了在连续条件下实现高催化活性和稳定性，研究了介孔无定形二氧化硅 - 氧化铝 (ASA) 催化剂，用于在无溶剂条件下使用固定床反应器将生物质衍生的丙酮酸催化自缩合为均三甲苯。 ASA 催化剂的催化效率取决于它们的结构和固有酸度。 与纯氧化铝相比，ASA Siralox 30 的丙酮转化催化活性高 2.2 倍，均三甲苯收率高 3.8 倍，证明了 ASA 催化剂中产生的布朗斯台德酸位点 (BAS) 的重要性。 详细的动力学研究和催化剂表征表明均三甲苯的形成优于 BAS，并且形成速率随着 …

2016年11月15日 · Specifically, a nanocrystalline Beta zeolite, a mesostructured Al-MCM-41 sample, and a commercial silica-doped alumina (Siralox-30) were employed as supports. The materials were characterized by ICP-OES, XRD, N 2 -physisorption, FTIR-pyridine, 27 Al MAS NMR spectroscopy, electron microscopy (HAADF-STEM, TEM), and low-temperature FTIR-CO.

Brønsted-acidic sites is found in SIRAL 30 and SIRAL 40. The more recently developed SIRAL HPV series provides even higher acidity and exhibits a larger pore volume.

2014年7月1日 · Brønsted acid sites of similar strength to those in zeolites are found in ASAs prepared by cogelation, as shown by thermogravimetric study of the dehydration of ethanol to ethylene. ASAs prepared by grafting and a commercial ASA (Siralox 30) show Brønsted acid sites that differ from those of zeolites.

通过与取代二氟苯胺/邻卤苯胺和2,6-二乙酰吡啶反应来合成 2,6-双（亚氨）吡啶衍生物的催化剂。 [1] 制备用于脱氧反应的 Ca 或 Ni 基催化剂的催化剂载体。 烃裂化过程和酯交换反应的催化剂 …

Our PURALOX, SIRALOX and PURALOX MG grades are also available as doped or even multidoped versions with a large flexibility regarding the dopants. The versatility of our doping technologies allows for the manufacturing of well-defined alumina-dopant arrangements ranging from phase-pure mixed oxides to coated aluminas or combinations thereof.