000			02002nam a2200181Ia 4500
003			MX-MdCICY
005			20250625153913.0
040			_cCICY
090			_aB-12958
245	1	0	_aPhase cooperation and remote control effects in selective oxidation catalysts
490	0		_vApplied Catalysis A: General, 81(2), p.141-213, 1992
520	3		_aThis review paper concerns allylic oxidations and oxidative dehydrogenations. The corresponding catalysts often contain two or several oxide phases. The objective is to discuss the possible reasons why these phases cooperate (act synergetically). Different interpretations are reviewed. The authors discuss in detail the evidence showing that the synergy is often due to remote control. In such a mechanism, one phase, the donor, dissociates oxygen to form a surface mobile species which spills over to the other phase, or acceptor. The acceptor is the potentially active phase. This phase needs to be irrigated by spill-over oxygen to exhibit maximum activity and selectivity. The various modifications of the acceptor brought about by spill-over oxygen are discussed: maintaining the acceptor at a high oxidation state, preventing the destruction of the structure of the acceptor, and inhibiting the formation of carbonaceous deposits or coke precursors. Parallel experiments with the same two-phase catalyste catalysing an oxygen aided dehydration suggest that the role of spill-over oxygen is to protect some Brensted acidity of the acceptor. This interpretation of the cooperation between phases permits definite roles to be attributed to the oxide phases present in multicomponent catalysts and to measure approximately their ability to act as donors or acceptors.
700	1	2	_aWeng, L.T.
700	1	2	_aDelmon, B.
856	4	0	_uhttps://drive.google.com/file/d/16x1_pKp5fywWyhxajXlcP3pMrYUR8S-s/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
942			_2Loc _cREF1
008			250602s9999 xx |||||s2 |||| ||und|d
999			_c47160 _d47160