Fig. 2. (a) Apparent first-order bimolecular ethanol dehydration rate constant (per H⁺, 373 K) and (b) rate deviation (χ) from the functional dependence of eqn (6), as a function of H₂O pressure on H-Al-Beta-F(0.16) (△), H-Al-Beta-F(1.2) ([black circle], at 423 K), H-Al-Beta-F(2.0) (■), and H-Al-Beta-OH(1.7) ([blacktriangledown]). Solid lines reflect regression to eqn (6).