The H-D exchange reaction between CD4 and each of a family of solid acids (the zeolite HZSM-5, sulfated zirconia, iron- and manganese-promoted sulfated zirconia, and AlCl3/sulfonic acid resin) was investigated with a batch recirculation flow reactor. the data determine initial rates of the exchange reaction giving CD3H at temperatures ranging from 440 K for AlCl3/sulfonic acid resin to 688 and 703 K for the zeolite and promoted sulfated zirconia, respectively. Extrapolated results show that the reaction is three orders of magnitude faster with the AlCl3/sulfonated resin tan analogue of the very strongly acidic combination of AlCl3 and H2SO4) than with HZSM-5 or promoted sulfated zirconia and two orders of magnitude faster with the latter than with sulfated zirconia.