The rate of formaldehyde (CH2O) oxidation over a Ag=SiO2 catalyst at 493 K and a CH2O pressure

Question:

The rate of formaldehyde (CH2O) oxidation over a Ag=SiO2 catalyst at 493 K and a CH2O pressure of 9 Torr in air was 1:4 x 10 –7 mole CH2Os –1 cm –3. The catalyst particles passed through a 100-mesh sieve (149 micron opening), and the average pore diameter of the SiO2 was 60 A˚. Can the rate be considered to be free of mass transport limitations?