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              <p>This study aimed at developing an innovative catalytic reactor inspired from monolith technology and equipped with in situ heat removal system. To illustrate the approach, the total hydrogenation of a bio-sourced olefin, alpha-pinene, was chosen as a model reaction. Preliminary thermal calculations proved the proposed reactor-heat exchanger configuration to be uniform in temperature, so that its behavior could be described through that of a single isothermal channel. The developed methodology then included the elaboration of the catalytic coating, the investigation of the reaction kinetics, the activity assessment of the catalytic capillary tube at pilot scale and the scale-up of the monolith reactor through multiscale and multiphysics modelling. First part of the work was dedicated to the catalytic tests, operated in a batch stirred autoclave reactor using both small coated platelets and powdered catalyst. Catalyst formulation and synthesis method were varied, leading to an efficient Pd/Al2O3 coating: it yielded a well adherent deposit of 5-10 µm thickness on aluminum alloy processed by selective laser melting and its initial activity exceeded that of a commercial egg-shell catalyst by more than one order of magnitude due to high metal dispersion (Pd nanoparticles of ca. 1 nm). The intrinsic kinetics of the reaction was investigated using the catalyst in powdered form: an overall activation energy of about 40 kJ/mol was obtained, and a Langmuir-Hinshelwood rate law with surface reaction as rate-determining step adequally described complex reaction orders with respect to alpha-pinene and hydrogen.  This selected catalyst was then coated on a series of jacketed aluminium tubes of 2 mm internal diameter and 40 cm total height. Their activity was assessed on a continuous hydrogenation set-up operating in the Taylor flow regime at 10-20 bar and 100-160°C. The capillary reactor was modelled through a “Unit Cell” approach(gas bubble surrounded by a liquid film and separated by two liquid half-slugs) accounting for hydrodynamics, gas-liquid and liquid-solid mass transfer and complex reaction kinetics. Numerical simulation of Unit Cell hydrodynamics was first thoroughly questioned, by examining the merits of simplifying hypotheses regarding the bubble shape to be considered, as well as the equations and boundary conditions to be solved. It served as a support for the transient calculation of the reactant concentrations, that mimicked the progression of the Unit Cell along the reactor. In addition to the effects of operating parameters on pinene conversion, those of gas consumption along the reactor (hydrogen being here the limiting reactant), "initial" saturation conditions of the liquid and catalyst activity were analyzed thanks to the numerical model. It was also used to evaluate a more direct reactor sizing tool, based on plug flow behavior and overall exchange coefficients. The latter were calculated either from existing correlations or from the numerical simulations, by evaluating the separate contributions of different parts of the bubble surface (film and caps) to gas-liquid mass transfer and the concentration gradients near the reactor wall.Finally, the behavior of the entire monolith could be reproduced from this model by combining, in a mixing module at the reactor outlet, the liquid outflows of channels whose individual flow rates matched the fluid distribution measured on a cold mock-up of the reactor-heat exchanger.</p>
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