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A seri es of selected or specially prepared catalysts were s tud ied fo r t heir abili ty to accelerate the ortho to para conversion of hydrogen . The res ults of t hi s st ud y a re presented and the p erformance of vari ous catalyst s are compared with t hat of chrom ic oxide on al u: mina pellets. An outstandin g cata.lyst, u~s upporte d hydrous J erric oxide g ra nules, was selected for further study a nd used 111 the liquefi ers of t he NatIOnal Burea u of Standards Cr yogenic Engineeringdoi:10.6028/jres.060.026 fatcat:ubtd7xd3dbeedp2ws5pfza2jeu