Beta”-alumina precursors

Zeta lithium aluminate lithia-precursor for processing of lithia-stabilized beta"-alumina 18, 17.3.7.1.1... 

Not only has the Ti precursor been investigated, but also the structure of the molecular sieve has been heavily investigated. Thus we now have an array of silica and silica-alumina molecular sieve supported Ti catalysts. These include Ti on amorphous Si02,10,11 Ti on a variety of Si02 mixed oxides,12 Ti-0 (titanium-beta),13"17 Ti-MCM-48,18 Ti-MCM-41,19 Ti-HMS,18 titanium-... 

Linear alkylbenzenes are made from linear terminal olefins and benzene and are important precursors of biodegradable anionic surfactants (LAS, linear alkylbenzenesulfonates). The conventional catalyst is HF, first to be replaced by a fluorinated silica-alumina in the DETAL process. The DETAL process is safer than the HF process and also more cost-effective because no special metallurgy is required and no calcium fluoride waste stream exists.52 Zeolites such as Beta may come to the fore here because they display a higher selectivity to the desired 2-phenyl isomers.55... 

The effect of precursor size not only applies to the same metal but also to different metals. This has been clearly shown by the reactions of metal beta-diketonates on alumina [41] the smallest density was obtained with the largest precursor, namely Ce(thd)4 (see Table 2). 

Figure 23. Formation of new adsorption sites (OH groups) in the growth of NiO, CuO, and Ce02 on alumina. DRIFT spectra of (A) 600 °C alumina, (B) NiO/alumina (four reaction cycles), (C) CuO/alumina (three reaction cycles), and (D) Ce02/alumina (four reaction cycles). The growth of NiO, CuO and CeO was carried out by using the corresponding beta-diketonates, Ni(acac)2, Cu(thd)2, and Ce(thd)4 as precursors and air as ligand removal agent.

Figure 25. Surface densities of metals determined after each reaction cycle of metal beta-diketonate and air in the preparation of LaCeCuO/alumina. La(thd)3, Ce(thd)4 and Cu(thd)2 were used as precursors.

---