Catalytic conversion of chloromethane to methanol and dimethyl ether over metal-exchanged zeolite Y

Fernandes, Daniella R.; Rosenbach, Nilton; Mota, Cláudio J. A.

doi:10.1016/j.apcata.2009.07.043

Cited by 11 publications

(13 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The metal cation also plays a role in the reactivity of the system. 24 The use of alkylhalides and metal-exchanged zeolite in alkylation, 25 and natural gas conversion to olefins 26 or methanol, 27 are practical applications of the concepts developed in the more fundamental spectroscopic and theoretical studies. …”

Section: Alkylhalides As Source Of Carbocations On Zeolitesmentioning

confidence: 99%

Carbocations on zeolites: quo vadis?

Mota

Rosenbach

2011

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

A natureza dos carbocátions adsorvidos na superfície da zeólita é discutida neste artigo, destacando estudos experimentais e teóricos. A adsorção de halogenetos de alquila sobre zeólitas trocadas com metais tem sido usada para estudar o equilíbrio entre alcóxidos, que são espécies covalentes, e carbocátions, que têm natureza iônica. Cálculos teóricos indicam que os carbocátions são mínimos (intermediários) na superfície de energia potencial e estabilizados por ligações hidrogênio com os átomos de oxigênio da estrutura zeolítica. Os resultados indicam que zeólitas se comportam como solventes sólidos, estabilizando a formação de espécies iônicas.The nature of carbocations on the zeolite surface is discussed in this account, highlighting experimental and theoretical studies. The adsorption of alkylhalides over metal-exchanged zeolites has been used to study the equilibrium between covalent alkoxides and ionic carbocations. Theoretical calculations indicated that the carbocations are minima (intermediates) on the potential energy surface and stabilized by hydrogen bonds with the framework oxygen atoms. The results indicate that zeolites behave like solid solvents, stabilizing the formation of ionic species.

show abstract

Section: Alkylhalides As Source Of Carbocations On Zeolitesmentioning

confidence: 99%

Carbocations on zeolites: quo vadis?

Mota

Rosenbach

2011

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…Although relatively higher yields of DME were obtained in this work and in other analogous reports using high-pressure batch reactors [21], the disadvantages of such reactors include the high-pressure conditions and long reaction times. In a recent study, the catalytic hydrolysis of chloromethane to methanol and DME was studied over metal-exchanged zeolite-Y at temperatures in the range of 453-673 K [7]. In the temperature range where methanol and DME were the main products, 453-613 K, the conversion was b10%.…”

Section: Introductionmentioning

confidence: 99%

“…While the vast majority of the reported work involved conversion of chloromethane to olefins over zeolites, only few studies have been reported on its hydrolysis to methanol and DME [7,9]. Methanol is the most important intermediate from natural gas.…”

Section: Introductionmentioning

confidence: 99%

“…A new alternative approach for natural gas conversion that has recently evolved involves activation of methane by halogenation. Halogenated methane is then converted to other efficient fuels, such as DME, [7] or other valuable chemical intermediates such as light olefins [8]. While methane reforming to syngas is highly endothermic, and hence very costly, the halogenation reaction is exothermic and cost effective [6].…”

Section: Introductionmentioning

confidence: 99%

“…The major products were methanol and DME in various compositions depending on the water/methyl halide ratio. Interest in this process has recently evolved and several recent studies have been reported [3,7,[10][11][12][13][14][15]. Most of these studies employed zeolite-based catalysts and the major products were olefins.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations