Chemical processes and adsorption phenomena frequently exhibit a negative Gibbs energy change at constant temperature and pressure, indicating thermodynamic spontaneity.
The claim is a well-established thermodynamic principle stating that processes can have a negative Gibbs energy change under constant temperature and pressure (indicating spontaneity). The retrieved papers (such as papers 1 and 2) explicitly calculate and report negative Gibbs free energy changes for spontaneous adsorption and reaction processes.