Abstract
The stability of TPA species interacting with various (Al,Si) hydrogel environments in the presence of alkali cations has been evaluated by thermal analysis (combined t.g.-d.t.a.-d.t.g.). Three different TPA—gel associations have been characterized by d.t.a. endotherms : crystalline (TPAX) n clusters (X = OH −,Br −) which are also detected by XRD, monomeric (TPAX) species in direct association with the (Al,Si) gel, and labile entities, [TPA +…(H 2O) x] bulky water clathrates, that interact very weakly with the remaining negative charges available after neutralization of the gel by small (Li,Na,K) alkali cations. The formation, relative concentration and stability of these species essentially depend on the relative amounts of Al 2O 3 and M 2O present in the gel, as well as on the nature (structure forming/breaking) of the alkali cations. Monomeric as well as water clathrated species lead to crystalline (M)ZSM—5 upon heating.
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