Quantification of surface acidity on a low surface area material
AssigneeSaint-Gobain Ceramics & Plastics, Inc.
InventorsTritti Siengchum, James M Ralph
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Abstract
Methods and systems of analyzing and quantifying a surface acidity on a low surface area sample are disclosed. The methods include analyzing a quantity of an effluent molecular probe desorption from a temperature programmed desorption (TPD) process and system, by employing a mass spectroscopy (MS) system. The molecular probe is chemically adsorbed on a clean surface of the sample before the TPD process. The sample has a surface area to mass ratio of less than 5 m2/g. In some embodiments, the total surface area analyzed in the method can be as low as 3 m2.
Claims23
A method of quantification of surface acidity of a sample, the method comprising the steps of:
- (1) removing surface moisture of the sample using a pretreatment process;
- (2) adsorbing a molecular probe on a surface of the sample;
- (3) removing physically adsorbed molecular probe from the surface of the sample;
- (4) releasing the adsorbed molecular probe by a method that includes a temperature programmed desorption (TPD) process;
- and
- (5) analyzing a total amount of the molecular probe desorbed from the TPD process by a method that includes mass spectroscopy (MS),
- wherein the sample has a surface area to mass ratio of less than 5 m2/g.
A method of quantification of surface acidity on a sample with a low surface area to mass ratio, the method comprising:
- analyzing, by a method that includes mass spectroscopy (MS), effluent molecular probe desorption from a process that includes a temperature programmed desorption (TPD), wherein the surface area to mass ratio of the sample is less than 5 m2/g and wherein the molecular probe is chemically adsorbed on a surface of the sample before the TPD process.
Dependencies are inferred from the claim text.