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The NaHSO4/MCM‐41 catalyst was synthesized by supercritical impregnation and investigated in dehydration of castor oil. The NaHSO4/MCM‐41 prepared by wet impregnation was also tested. The supercritical condition was favorable to improve NaHSO4 dispersion. The amount of interaction sites between NaHSO4 and MCM‐41 was enhanced and NaHSO4 leaching was retarded. Surface area, pore volume and size, total...
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