Abstract: Disclosed are zeolitic materials that include a microporous crystalline framework substituted with one or more paired Lewis acid sites. Each of the one or more paired Lewis acid sites within the zeolitic material can comprise a first Lewis acid metal center and a second Lewis acid metal center. The first Lewis acid metal center and the second Lewis acid metal center can be separated by three or fewer atoms within the crystalline framework. Also provided herein are methods of making these zeolitic materials as well as methods of using these zeolitic materials as catalysts.

Abstract: An ion mobility mass spectrometry (IMMS) method is disclosed for evaluating petroleum feedstock compositions. The method is useful to determine, e.g., nitrogen speciation in chemical components of a petroleum composition and may be used to evaluate hydroprocessing catalyst performance.

Abstract: Disclosed are zeolitic materials that include a microporous crystalline framework substituted with one or more paired Lewis acid sites. Each of the one or more paired Lewis acid sites within the zeolitic material can comprise a first Lewis acid metal center and a second Lewis acid metal center. The first Lewis acid metal center and the second Lewis acid metal center can be separated by three or fewer atoms within the crystalline framework. Also provided herein are methods of making these zeolitic materials as well as methods of using these zeolitic materials as catalysts.

Abstract: Disclosed herein are methods for preparing nanomaterials, such as nanoparticles. The methods can involve jet-mixing two or more precursor solutions to form the nanomaterials. By rapidly mixing the precursor solutions, nanomaterials of improved quality and uniformity can be prepared in high yield (e.g., in yields of at least 85%). The methods are also scalable, and allow for the continuous production of nanomaterials. Also provided are jet-mixing reactors that can be used to prepare nanomaterials using the methods described herein.