12-Tungstophosphoric acid/zirconia—a highly active stable solid acid—comparison with a tungstated zirconia catalystElectronic supplementary information (ESI) available: W and P analysis in the reaction mixtures. Fig. S1: 31P MAS NMR. Fig. S2: FT-IR pyridine adsorption spectra. Fig. S3: conversion and acidity vs. TPA loading. See http://www.rsc.org/suppdata/cc/b2/b200722c/

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