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HZSM-5 prepared in situ or ex situ from the NH 4 -type one was modified by chemical vapor deposition (CVD) of silica for the shape-selective production of p-xylene from methylation of toluene, and the influence of preparation conditions upon the obtained selectivity was studied. The external surface of the ex situ prepared HZSM-5 deteriorated partially, maybe, due to the dealumination caused...
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