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An original procedure to obtain a solid which combines the microporosity of a Y zeolite with a broad distribution of mesoporosity is described. The starting gel is composed of a mixture of Y zeolite and a source of silica, such as mesoporous FSM-16 or rice hull ash (RHA). Seeds of the crystalline fraction are obtained by depolymerizing the crystalline frameworks of Y zeolite in glycerol, heated at...
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