Manganese oxides dehydrated

EDA reacts readily with two moles of CS2 in aqueous sodium hydroxide to form the bis sodium dithiocarbamate. When aqueous ammonia and 2inc oxide (or manganese oxide or its hydrate) is used with a basic catalyst, the 2inc (or manganese) dithiocarbamate salt is isolated. Alternatively, the disodium salt can react with ZnSO or MnSO followed by dehydration in an organic solvent to yield the same salts (48—50). 

Preparation of Manganese(ll) Oxide. Dehydrate 1 g of manganese oxalate by heating in a porcelain bowl at not over 200 °C. Transfer the salt into a porcelain boat and roast it in a tubular furnace in a stream of dry hydrogen at 300-400 °C (see Fig. 115). Preliminarily check the tightness of the apparatus and the purity of the hydrogen ... 

The formation of oxide nanoparticles of NiO, ZnO, and CU2O has been studied using Ni-, Zn-, and Cu-exchanged natnral clinoptilolites dehydrated by heating in air at 550 °C [llRl], The delydration of Mn-exchanged clinoptilolite does not lead to the crystallization of manganese oxide, bnt affects the crystallinity of the host clinoptilolite lattice which becomes amorphous. The NiO, ZnO, and Cn20 nanoparticles were fotmd to be randomly dispersed in the clinoptilolite matrix. The particle sizes varied from 2 to 5 nm and exceeded the... 

Leroux et al. reported the electrochemical behavior of various layered manganese oxides. They reported that interlayer water played a major role in the electrochemical behavior of manganese oxides. In their study, dehydrated manganese oxides at T greater than 200°C showed better retention over 10 cycles and a larger Li+ diffusion coefficient because of the decreased level of interlayer... 

The use of the Hquid-phase process in acetic acid with the cobalt— manganese—bromine system as explained in the tetephthaUc acid section is also possible (149). This process has been used by Amoco Chemical to produce pyromellitic acid, and facUities remain in place to do so again in the future. As with all hquid-phase oxidations of this type, yields ate high. A separate dehydration step would be needed to yield the dianhydtide. 

Dining dehydration of manganese(II) perchlorate [1] or nickel(II) perchlorate [2] with dimethoxypropane, heating above 65°C caused violent explosions, probably involving oxidation by the anion [1] (possibly of the methanol liberated by hydrolysis). Triethyl orthoformate is recommended as a safer dehydrating agent [2] (but methanol would still be liberated). 

Krupay and Ross (272b), in a study of the decomposition of formic acid on manganese (II) oxide, demonstrate that manganese (II) formate is produced during reaction and discuss the probable role of this participant in the catalytic process. The reported Arrhenius parameters (log A, E) for the dehydration and dehydrogenation reactions were (28.7, 132) and (24.9, 87), respectively both points were close to the compensation line (Table V, K) characteristic of the breakdown of formic acid on oxides. 

---