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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Optimization Approach for Hydrogen Infrastructure Planning Under Uncertainty.

Margarita E Efthymiadou1, Vassilis M Charitopoulos1, Lazaros G Papageorgiou1

  • 1The Sargent Centre for Process Systems Engineering, Department of Chemical Engineering, UCL (University College London), Torrington Place, London WC1E 7JE, U.K.

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Summary
This summary is machine-generated.

Achieving net-zero requires understanding hydrogen infrastructure investment trade-offs. A stochastic optimization model shows that combining autothermal reforming and biomass gasification with carbon capture and storage (CCS) is the most cost-effective low-carbon hydrogen strategy.

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Area of Science:

  • Energy Systems Analysis
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Transitioning to low-carbon energy systems is crucial for achieving net-zero emissions.
  • Strategic decisions regarding hydrogen infrastructure investments involve complex trade-offs.
  • Uncertainties in demand, costs, and resource availability complicate planning.

Purpose of the Study:

  • To develop a framework for optimizing hydrogen infrastructure investments.
  • To analyze cost-efficiency of different hydrogen production pathways under uncertainty.
  • To inform strategic decision-making for low-carbon hydrogen systems in Great Britain.

Main Methods:

  • A two-stage stochastic optimization framework using mixed-integer linear programming (MILP).
  • Detailed spatiotemporal modeling to meet hydrogen demand.
  • Forward scenario reduction to manage computational complexity.

Main Results:

  • The most cost-efficient strategy involves autothermal reforming and biomass gasification with carbon capture and storage (CCS).
  • Uncertainty analysis reveals a risk-averse approach is necessary for robust decision-making.
  • Water electrolysis penetration significantly impacts the optimal production mix.

Conclusions:

  • Integrated hydrogen production, storage, and transport infrastructure planning is vital for net-zero goals.
  • Stochastic optimization provides valuable insights into managing uncertainties in energy system transitions.
  • A diversified approach combining various low-carbon hydrogen production methods, including CCS, is recommended.