“…where r(x) is the reaction rate (mol m −2 s −1 ); C s (x) is the NO concentration on the catalyst surface (mol m −3 ), which is different from the NO concentration in the gas bulk phase, C(x), due to mass transfer limitations; k and K are the L-H reaction rate constant (mol m −2 s −1 ) and adsorption equilibrium constant (m 3 mol −1 ), respectively. 26 These two constants are independent of concentration field, fluid dynamics, and reactor geometry. 27 Meanwhile, the kinetic model can be simplified to a pseudo-first-order reaction rate equation: 28…”