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Briefly explain the techniques of catalyst characterization: c) FT-IR of solids with pyridine adsorbed) XRD in the analysis of a catalyst
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- please help me answer my assignment. thanks the rate constants (k) for the leaching of galena in an aqeous medium containing ammonium acetate under oxygen pressure at the different temperature are listed below: log K -10.9 -11.1 -11.2 -11.5 -12.1 -12.6 1/t x10^3 2.30 2.35 2.38 2.45 2.61 2.76 where k and T are expressed in mole^2/cm/min and K respectively. Calculate the activation energy of the leaching processBriefly explain the catalyst characterization techniques: a)thermal analysis: TG/DTG, DTA; b)pyridine TPDSuppose it is known that ozone adsorbs on a certain surface in accord with a Langmuir isotherm. How could you use the pressure dependence of the fractional coverage to distinguish between adsorption (i) without dissociation, (ii) with dissociation into O + O2, (c) with dissociation into O + O + O?
- Benzene on graphite follows the Langmuir isotherm. At a pressure of 1 atm, theThe volume of benzene adsorbed on a sample of graphite was 4.2 mm3 atconditions T = 0°C and 1 atm. At 3 atm it was 8.5 mm3. Suppose 1 molecule ofbenzene occupies 30Å and estimate the surface area of graphite.1.2-MIB (Methylisoborneol) is one of the by-products of algae and is a representative trace pollutant that causes taste and smell of water. The isothermal adsorption equation of 2-MIB applied with activated carbon in water without organic matter was experimentally determined as follows.q = 1.48C^(0.65) Where q is ng 2-MIB / g activated carbon and C is the concentration of g / L 2-MIB (g / L).(n is 10 ^ -9) A. Calculate the amount of activated carbon (mg / L) required to reduce the concentration of 2-MIB to 5 g / L. It is assumed that the concentration of 2-MIB in water without organic matter is 50 g / L.B. The activated carbon adsorption column will be designed with a three-year operating period. If the density of activated carbon is 540 kg / m3 and the design flow rate per column effective cross-section is 10 m / hr, find the depth of activated carbon in the empty bed contact time (EBCT) and column. Here, it is assumed that there is no competitive adsorption that can interfere with…The composition of a liquid phase reaction 2A → B was monitored by aspectrophotometric method with the following results: t, s [B], mol/L 0 0 600 0.089 1200 0.153 1800 0.200 2400 0.230 ∞ 0.312 Identify the rate law, integrated rate law, and rate constant for thereaction based on the obtained data.
- In the fluorination reaction of butadiene, the butadiene is adsorbed onto a catalyst C.To test the efficiency of the adsorption, the adsorption isotherm was determined.The volume of butadiene per gram of C varied as follows at constant temperature:p( kPa)- 13.3; 26.7 ; 40.0 ; 53.3 ; 66.7 ; 80.0V(cm3)-17.9 ; 33.0 ; 47.0 ; 60.8 ;75.3 ; 91.3At the temperature used, p* for butadiene is 200 kPa. Find a suitable isotherm for the data and determine Vmon. please assist.The Arrhenius parameters for the gas-phase decomposit ion of cyclobutane, C4H8(g)→ 2 C2H4(g). are log(A/s-1) = 15.6 and Ea = 261 kJ mol- 1. What is the ha lf- life of cyclobutane at (a) 20 °C, (b) 500 °C?The adsorption of a gas is described by the Langmuirisotherm with a= 1.85 kPa-1 at 25 oC. Calculate the pres-sure at which the fractional surface coverage is (a) 0.10 and (b) 0.90.
- For the reaction NH2SO2OH + H2O → NH4HSO4 In aqueous solution at 80.35oC, the following constants were observed at the indicated ionic strength μ x103 k (L/mol hr) 5.06 1.07 11.21 1.02 15.85 0.976 22.94 0.886 From these data ascertain: a.) the valence of the reacting ions and b.) the rate constant for the primary salt effect.An enzyme-catalyzed reaction has a Km of 1.4 mM and a Vmax of 7 nM/s. What is the initial velocity when the substrate concentration is 0.6 mM?An enzyme kinetics experiment is carried out by adding 1.00mg of a 50.0kDa enzyme into a total volume of 50uL of buffer, and measuring the initial rates while adding increasing amounts of substrate (1 Da = 1 g/mol). The calculated Vmax from this series of experiments was 30.5mM/s. Calculate the turnover number for the enzyme.