So it is considered that the coking reaction is related to the amount of acid sites and the coordinated action of Lewis/ Brnsted acid sites. 磷化合物的加入使层柱交联累托石催化剂的B酸强度增加,但积炭反应主要不是由B酸强度决定,而是与强弱B酸中心数目的比例以及B酸和L酸的协同作用有关。
Compared with pure TiO 2, the addition of SiO 2 obviously improved the thermal stability and crystal stability of the composite oxide. The source of producing Brnsted acid sites was Ti-O-Si bonds, coming from the composite oxide. 与纯TiO2相比,引入SiO2明显提高了复合氧化物的热稳定性和晶型稳定性;
While higher fluorine content leads to the formation of stronger Brnsted acid site and Lewis acidity is also strengthened. 在氟含量较高时,生成了新的更强的B酸中心,且使得L酸酸性增强。
Acetonitrile was utilized as an IR molecular probe to determine the acid type ( Brnsted or Lewis acid) and Lewis acid strength of the ionic liquids. 采用乙腈探针红外光谱法测定了离子液体的酸类型(Br¨onsted/Lewis酸),并指示了离子液体的Lewis酸强度。