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?
Answer to relevant QuestionsWith reference to Problem 1.15, find the magnitude of the maximum shear stress and show by sketch the orientation of the plane it acts on.Consider a three-dimensional state of stress characterized by: σxx = 3,000 σyy = 2,000 τxy = 0. σzz = 4,000 τzx = 0. τyz = 2,500 where units are psi and compression is positive. Find: the ...Strain measurements are made on a wide, flat bench in a dimension stone quarry using a 0-45-90 rosette. The 0-gauge is oriented N60E. Specific weight of the stone (a granite) is 162 pcf (25.6 kN/m3); Young’s modulus E = ...Suppose an NX-size test cylinder with an L/D ratio of two has a Young’s modulus of 10 million psi, a Poisson’s ratio of 0.35 and fails in uniaxial compressive at 0.1% strain. Find: 1 The axial load (kN) and stress ...Name the two types of external forces recognized in mechanics and give an example of each.
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