^{Enhancement of Brønsted acidity in zeolitic catalysts due to an
                  intermolecular solvent effect in confined micropores}

            ^{Anmin Zheng, Bing Han, Bojie Li, Shang-Bin Liu and Feng Deng}

    ^{Solid-state NMR and DFT calculation studies certified the presence of an intermolecular solvent effect for molecules confined in microporous zeolite, leading to a notable increase in Brønsted acidity of the solid acid catalyst.
 
http://pubs.rsc.org/en/Content/ArticleLanding/2012/CC/c2cc32498a}