Q.1
14 Marks(a)
Differentiate homogeneous and heterogeneous reactions with examples.
(b)
Discuss steps involved in heterogeneous catalytic reactions.
(c)
Discuss Catalysts with its broad classification.
Gujarat Technological UniversitySummer 2026 examination
GTU 3170501 Chemical Reactions Engineering II Summer 2026 Question Paper & PDF
B.E. · Chemical Engineering · Semester 7 · Subject code 3170501
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 2:30 PM – 5:00 PM
- Questions
- 5 with internal choice
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1 of 25 questions on this paper were also asked in other years. 1 more is a type of question GTU sets again with new data. Each is marked below with the years it appeared.See all 2 repeated 3170501 questions, most asked first
Q.2
14 Marks(a)
With proper sketches illustrate various contacting patterns for two flowing fluids.
(b)
Explain the mechanism of solid catalyzed Gas phase reactions using Langmuir-Hinshelwood-Hougen-Watson (LHHW) model.
Also asked in Summer 2025 Q5b OR
(c)
Define internal effectiveness factor and develop an expression for the same considering diffusion and reaction of reactant A through a single cylindrical catalyst pore. Assume first order reaction.
OR
(c)
Discuss the method of catalyst’s surface area determination.
Q.3
14 Marks(a)
Give examples for various fluid fluid reactions.
(b)
Discuss film conversion parameters in detail.
(c)
Air with gaseous A bubbles through a tank containing aqueous Reaction occurs as follows: A (g l) + B (l) R (l) -rA = kCACB k = 10⁶ m³ (mol. hr) For this system kAg a = 0.1 mol/hr. m³. Pa fl = 0.01 m³ liquid/m³ reactor kAl a = 100 m³ liquid/m³ reactor. hr HA = 10⁴ Pa. m³/mol, very low solubility DAl = DBl = 10--6 m²/hr a = 100 m²/m³ For a point in the reactor where, pA = 100 Pa and CB = 100 mol/m³
acalculate the rate of reaction (mol/m³ hr)
bResistance offered by the main body of liquid
cLocate the reaction Zone
Also asked in Summer 2025 Q3c
OR
(a)
Give reason for the statement. “Effective temperature control of large fixed beds can be difficult”.
(b)
Dilute A diffuses through a stagnant liquid film onto a plane surface consisting of B, reacts there to produce R which diffuses back into the mainstream. Develop the overall rate expression for the liquid solid (L/S) reaction A(1) + B (s) R(1)
(c)
State various experimental methods for finding rates in solid catalyzed reaction.
Q.4
14 Marks(a)
Enlist the criteria for selection of a good contactor depends for gas liquid (G/L) reactions.
(b)
Discuss catalysts poisons and reactivation.
(c)
With neat sketches enlist various types of catalytic reactors.
OR
(a)
Discuss Trickle bed reactor in brief.
(b)
Discuss the importance of solubility data for determination of kinetic regime for fluid – fluid reaction.
(c)
Discuss the resistances involved in the G/L reaction on a catalyst surface with sketch.
Q.5
14 Marks(a)
Discuss catalyst’s promoters and inhibitors with example.
(b)
Explain Progressive Conversion Model for fluid particle reaction.
(c)
Derive rate equation for slow reaction with respect to mass transfer.
OR
(a)
Give examples of fluid solid reactions in which solid does not appreciably change in size during reaction.
(b)
Discuss in brief about fluidised bed reactor.
(c)
Uniform-sized spherical particles UO3 are reduced to UO2 in a uniform environment with the following results: T, hr 0.180 0.347 0.453 0.567 0.733 XB 0.45 0.68 0.80 0.95 0.98 If reaction follows the Shrinking Core Model (SCM), find the rate controlling mechanism and a rate equation to represent this reaction.
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About this paper
Official Gujarat Technological University (GTU) examination paper for Chemical Reactions Engineering II (Summer 2026, B.E. · Chemical Engineering, Sem 7). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.