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Treatment of alumina bound MTW zeolite extrudates with H3PO4 causes conversion of the binding matrix from Al2O3 to tridymite AlPO4 and we show the crystalline AlPO4 coats the surface of the MTW zeolite crystals. In this transformation, the surface area and pore volume of the catalyst decrease precipitously, but the MTW crystallinity remains largely intact. Similar, but less specific behavior was observed...