We also performed iPP hydrogenolysis with [tBu3PH][SZO300]. This material has significantly lower Brønsted acidity than native SZO300 because acidic -OH groups on this material react with the relatively strong phosphine base (pKa(tBu3PH) = 17.0 in MeCN). Under iPP hydrogenolysis conditions both [tBu3PH][SZO300] and native SZO300 produce the same yields of extractable oils with essentially identical microstructures (Figure ). This result suggests that Brønsted acidity has a minimal role in this reaction.