Hydrogen Balloon Method
Hydrogen Balloon Method - Related Videos
06:06
Hydrogenation
0 Views •
2023
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate the hydrogenation of chalcone as an example of an alkene hydrogenation reaction (Figure 1). In this experiment, palladium on carbon (Pd/C) will be used as a heterogeneous catalyst for the process. A balloon will be used to supply the hydrogen atmosphere. Figure 1: Diagram showing the hydrogenation of chalcone to 3-phenylpropiophenone.
02:18
A Sensitive Visual Method for the Detection of Hydrogen Sulfide-Producing Bacteria
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2025
Source: Zhu, W., & Chu, W. Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria. J. Vis. Exp. (2022)This video demonstrates a sensitive visual method for the rapid detection of hydrogen sulfide–producing bacteria. A color change from yellow to black indicates bacterial activity through the formation of bismuth sulfide.
02:06
Inducing Brain Death in a Mouse Model Using a Balloon Catheter
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2025
This video demonstrates the procedure for inducing brain death in a mouse model by increasing controlled intracranial pressure through a balloon catheter, mimicking natural brain death.
08:56
Catalytic Reactor: Hydrogenation of Ethylene
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA The hydrogenation of ethylene (C2H4) to ethane (C2H6) has often been studied as a model reduction reaction in characterizing new metal catalysts.1-2 While supported nickel is not the most active metal catalyst for this reaction, it is active enough that reaction can take place at < 200°C. The reaction typically involves adsorbed, dissociated hydrogen (H2) reacting...
08:42
A Rat Carotid Balloon Injury Model to Test Anti-vascular Remodeling Therapeutics
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Cited by 8 •
2016
The rat carotid balloon injury model described below allows researchers to evaluate drugs or therapeutics that negate injury-induced arterial hyperplasia. Detailed pre-surgical preparation, surgical procedure, and post-surgical cares of the animal are described.
FAQs
The catalyst provides a surface where hydrogen gas can be activated into hydrogen atoms. Those atoms then add across unsaturated bonds in the substrate, including alkene, alkyne, or carbonyl-containing structures. Palladium, platinum, and nickel can serve this role, so catalyst selection determines which catalytic surface is available for the reduction.
Hydrogen must contact both the catalyst and the reaction mixture for surface activation and bond reduction to occur. The solvent forms the reaction medium, while gas contact affects how effectively hydrogen reaches the catalytic system. Consequently, catalyst, solvent, and gas-contact conditions must be considered together when aiming for a useful conversion.
A flexible balloon supplies hydrogen at near-atmospheric pressure, making this method a simpler alternative to specialized pressurized hydrogen equipment. The approach still depends on catalyst-mediated activation and effective gas contact, but it avoids the defining use of pressurized hydrogen systems. This distinction makes the setup relevant for laboratory reductions where such equipment is unnecessary.
A typical setup places the substrate and chosen solvent in a reaction mixture, introduces an appropriate hydrogenation catalyst, and connects the mixture to a flexible hydrogen balloon. The balloon supplies hydrogen while the gas contacts the catalyst and solution. The selected catalyst, solvent, and contact arrangement should match the intended functional-group reduction.
Hydrogen Balloon Method reactions can reduce unsaturated functional groups and help convert less saturated structures into more saturated molecules. They may also support removal of protecting groups, depending on the substrate and catalyst used. These capabilities make the technique useful in synthetic chemistry for changing alkene, alkyne, or carbonyl-containing compounds.
Hydrogen is a flammability hazard, so the gas source, reaction arrangement, and surrounding laboratory conditions require careful control. Safety is part of the method rather than an optional addition because the procedure combines hydrogen gas with a chemical reaction and a catalyst. Appropriate attention to these hazards supports safer laboratory use of catalytic hydrogenation.